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Diouf D, Diop NA, Thiaré DD, Coly A, Gaye-Seye MD, Diaw PA, Le Jeune B, Giamarchi P. Analysis of non-native fluorescent pesticides by thermo-induced and photo-induced fluorescence, a comparative study. Spectrochim Acta A Mol Biomol Spectrosc 2023; 302:123036. [PMID: 37393675 DOI: 10.1016/j.saa.2023.123036] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 06/09/2023] [Accepted: 06/16/2023] [Indexed: 07/04/2023]
Abstract
This paper compares the performance of three analytical methods for the determination of pesticides in natural waters. As many pesticides are non-fluorescent, they are transformed into highly fluorescent by-products in two ways: elevated temperature in an alkaline medium (thermo-induced fluorescence - TIF); or UV irradiation in water (photo-induced fluorescence - PIF). The first method studied uses TIF, the second one uses PIF and the third one uses an automatic sampling and analysing PIF system. Analytical applications were carried out using the three methods for the determination of deltamethrin and cyhalothrin, pesticides widely used in Senegal. In both cases, the calibration curves obtained are linear without matrix effects, and the detection limits are good in the ng mL-1 range. It appears that the analytical performances of the automatic PIF method are better than the two others. The advantages and disadvantages of the three methods are then compared and discussed in term of analytical performance and usability.
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Affiliation(s)
- Diéry Diouf
- Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Senegal; OPTIMAG Lab., Brest Univ., 6 Av. Victor Le Gorgeu, 29285 Brest Cedex, France
| | - Ndeye A Diop
- Lab. Matériaux, Electrochimie et Photochimie Analytiques, Univ. A. Diop, Bambey, Senegal; OPTIMAG Lab., Brest Univ., 6 Av. Victor Le Gorgeu, 29285 Brest Cedex, France
| | - Diène D Thiaré
- Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Senegal
| | - Atanasse Coly
- Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Senegal
| | - Mame D Gaye-Seye
- Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Senegal; Lab. Géomatériaux et Environnement, Univ. Paris-Est, 77454 Marne-la-Vallée, France
| | - Pape A Diaw
- Lab. Matériaux, Electrochimie et Photochimie Analytiques, Univ. A. Diop, Bambey, Senegal
| | - Bernard Le Jeune
- OPTIMAG Lab., Brest Univ., 6 Av. Victor Le Gorgeu, 29285 Brest Cedex, France
| | - Philippe Giamarchi
- OPTIMAG Lab., Brest Univ., 6 Av. Victor Le Gorgeu, 29285 Brest Cedex, France.
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2
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Diop NA, Diouf D, Bodian EHT, Faye C, Bakhoum JP, Thiare DD, Diaw PA, Gaye-Seye MD, Coly A, Le Jeune B, Giamarchi P. High sensitivity on-site early warning system monitoring of pesticides by photo-induced fluorescence. Anal Chim Acta 2023; 1250:340969. [PMID: 36898818 DOI: 10.1016/j.aca.2023.340969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 02/03/2023] [Accepted: 02/12/2023] [Indexed: 02/15/2023]
Abstract
This paper describes the prototype of an on-site High Sensitivity Early Warning Monitoring System, using Photo-Induced Fluorescence, for pesticide monitoring in natural waters (HSEWPIF). To obtain a high sensitivity, the prototype was designed with four main features. Four UV LEDs are used to excite the photoproducts at different wavelengths and select the most efficient one. Two UV LEDs are used simultaneously at each wavelength to increase the excitation power and then the fluorescence emission of the photoproducts. High-pass filters are used to avoid the saturation of the spectrophotometer and to increase the signal-to-noise ratio. The HSEWPIF prototype also employs UV absorption to detect any occasional increase of suspended and dissolved organic matter, which could disrupt the fluorescence measurement. The conception of this new experimental set-up is explained and described, then analytical applications are carried out online for the determination of fipronil and monolinuron. We obtained a linear calibration range from 0 to 3 μg mL-1 with limits of detection of 1.24 ng mL-1 for fipronil and 0.32 ng mL-1 for monolinuron. A mean recovery of 99.2% for fipronil and 100.9% for monolinuron show that the method is accurate, moreover a standard deviation of 1.96% for fipronil and 2.49% for monolinuron show that the method is repeatable. Compared to other methods for the determination of pesticides by photo-induced fluorescence, the HSEWPIF prototype has good sensitivity with better limits of detection, and good analytical performances. These results show that HSEWPIF can be used for monitoring pesticide in natural waters to protect industrial facilities against accidental contamination.
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Affiliation(s)
- Ndeye A Diop
- OPTIMAG Lab., Brest Univ., 6 Av. Victor Le Gorgeu, 29285, Brest Cedex, France; Lab. Matériaux, Electrochimie et Photochimie Analytique, Univ. A. Diop, Bambey, Senegal
| | - Diéry Diouf
- Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Senegal
| | | | - Coumba Faye
- Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Senegal
| | | | - Diène D Thiare
- Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Senegal
| | - Pape A Diaw
- Lab. Matériaux, Electrochimie et Photochimie Analytique, Univ. A. Diop, Bambey, Senegal
| | | | - Atanasse Coly
- Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Senegal
| | - Bernard Le Jeune
- OPTIMAG Lab., Brest Univ., 6 Av. Victor Le Gorgeu, 29285, Brest Cedex, France
| | - Philippe Giamarchi
- OPTIMAG Lab., Brest Univ., 6 Av. Victor Le Gorgeu, 29285, Brest Cedex, France.
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El Hachem R, El Osta N, Sacre H, Salameh P, Wassef E, Le Brun G, Pellen F, Le Jeune B, Daou M, Khalil I, Abboud M. Lack of Correlation Between the Penetration of Two Types of Sealers and Interfacial Adaptation to Root Dentine. Eur Endod J 2022; 7:150-155. [PMID: 35786577 PMCID: PMC9285998 DOI: 10.14744/eej.2022.06025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 01/04/2022] [Indexed: 11/20/2022] Open
Abstract
OBJECTIVE This study aimed to determine the correlation between sealer penetration into dentinal tubules and interfacial adaptation to root canal walls using a hydraulic calcium silicate-based sealer, Endosequence Bioceramic Sealer (Brasseler USA, Savannah, GA, USA), and an epoxy resin-based sealer, AH Plus (Dentsply DeTrey, Konstanz, Germany). METHODS Sixty-four maxillary central incisors were endodontically prepared with nickel-titanium rotary instruments and randomly assigned into two groups (n=32). Roots were filled with gutta-percha using a single-cone technique in conjunction with one of the two sealers, AHP or BCS. Sealers were mixed with Rhodamine B and analysed under a confocal laser scanning microscope. Transverse sections at 5 mm from root apex were obtained. The circumference of the root canal wall was first outlined and measured to determine the circumferential percentage of sealer penetration. The regions along the canal walls where the sealer had penetrated the dentinal tubules were delineated and measured. Then, the outlined distances were divided by the canal circumference. The width of each gap was measured and pooled for each specimen for comparison to determine the interfacial adaptation. The measurements were repeated twice to ensure reproducibility. Mann-Whitney tests were performed to compare continuous variables between AHP and BCS groups. The correlation between gap width and percentage of sealer penetration was investigated using the Spearman correlation coefficient. RESULTS No significant difference was observed between groups regarding the percentage of sealer penetration (P>0.05) and the gap width (P>0.05). Also, there was no significant correlation between the two variables analysed for AHP (r=0.165; P>0.05) and BCS (r=-0.147; P>0.05) and in the overall sample (r=0.061; P>0.05). CONCLUSION The present results show no correlation between interfacial adaptation and sealer penetration in dentinal tubules in the total sample and among sealer subgroups. The ability of root canal sealers to penetrate dentinal tubules cannot be considered a sign of better interfacial adaptation.
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Affiliation(s)
- Roula El Hachem
- Department of Endodontics, Saint Joseph University of Beirut Faculty of Dental Medicine, Beirut, Lebanon
| | - Nada El Osta
- Department of Prosthodontics, Saint Joseph University of Beirut Faculty of Dental Medicine, Beirut, Lebanon
- Equipe d'accueil EA 4847, Center for Research in Clinical Odontology (CROC), Clermont Auvergne University, Clermont-Ferrand, France
- Craniofacial Research Laboratory, Oral Health Unit, Saint Joseph University of Beirut Faculty of Dental Medicine, Beirut, Lebanon
| | - Hala Sacre
- INSPECT-LB, National Institute of Public Health, Clinical Epidemiology and Toxicology-Lebanon, Beirut, Lebanon
| | - Pascale Salameh
- INSPECT-LB, National Institute of Public Health, Clinical Epidemiology and Toxicology-Lebanon, Beirut, Lebanon
- Deparment of Research, Lebanese University Faculty of Pharmacy, Hadat, Lebanon
- Deparment of Research, Lebanese University Faculty of Medical Sciences, Hadat, Lebanon
| | - Elie Wassef
- Department of Endodontics, Saint Joseph University of Beirut Faculty of Dental Medicine, Beirut, Lebanon
| | - Guy Le Brun
- OPTIMAG laboratory, IBSAM, University of Western Brittany, Brest, France
| | - Fabrice Pellen
- OPTIMAG laboratory, IBSAM, University of Western Brittany, Brest, France
| | - Bernard Le Jeune
- OPTIMAG laboratory, IBSAM, University of Western Brittany, Brest, France
| | - Maha Daou
- Department of Pediatric Dentistry, Saint Joseph University of Beirut Faculty of Dental Medicine, Beirut, Lebanon
- Craniofacial Research Laboratory, Oral Health Unit, Faculty of Dental Medicine, Saint Joseph University of Beirut, Beirut, Lebanon
| | - Issam Khalil
- Department of Endodontics, Saint Joseph University of Beirut Faculty of Dental Medicine, Beirut, Lebanon
| | - Marie Abboud
- Department of Physics, UR TVA, Saint Joseph University of Beirut Faculty of Science, Beirut, Lebanon
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Alem N, Pellen F, Le Brun G, Le Jeune B. Radiofrequency modulator for marine lidar radar systems featuring compact and agile extra-cavity architecture using a polarimetric effect. Appl Opt 2022; 61:3671-3678. [PMID: 36256407 DOI: 10.1364/ao.457596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 04/09/2022] [Indexed: 06/16/2023]
Abstract
This paper proposes a new, to the best of our knowledge, modulator architecture for a microwave-modulated lidar for marine applications. The principle is based on the use of an infrared picosecond laser source, coupled to an external cavity, ensuring wavelength conversion in the visible range as well as radiofrequency modulation. Wavelength conversion is performed by a nonlinear crystal associated with adapted mirrors, while multiple round trips and polarization control in the cavity ensure microwave modulation. This paper presents both modeling of the emitted signal and the practical realization of this device.
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Bodian EHT, Thiaré DD, Bakhoum JP, Mbaye OMA, Diop NA, Diaw PA, Le Jeune B, Coly A, Giamarchi P. Determination of Flumethrin and Tau-Fluvalinate Pyrethroid Insecticides in Surface and Groundwater by Photochemically Induced Fluorescence (PIF). ANAL LETT 2022. [DOI: 10.1080/00032719.2022.2040524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- El Hadji Tombé Bodian
- Laboratoire de Photochimie et d’Analyse (LPA), Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
- Laboratoire OPTIMAG, Université de Bretagne Occidentale (UBO), Brest Cedex, France
| | - Diène Diégane Thiaré
- Laboratoire de Photochimie et d’Analyse (LPA), Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
| | - Jean Pierre Bakhoum
- Laboratoire de Photochimie et d’Analyse (LPA), Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
- Laboratoire OPTIMAG, Université de Bretagne Occidentale (UBO), Brest Cedex, France
| | - Olivier Maurice Aly Mbaye
- Laboratoire de Photochimie et d’Analyse (LPA), Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
| | - Ndeye Arame Diop
- Laboratoire Matériaux, Electrochimie et Photochimie Analytique, Université A. Diop, Bambey, Senegal
| | - Pape Abdoulaye Diaw
- Laboratoire de Photochimie et d’Analyse (LPA), Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
- Laboratoire Matériaux, Electrochimie et Photochimie Analytique, Université A. Diop, Bambey, Senegal
| | - Bernard Le Jeune
- Laboratoire OPTIMAG, Université de Bretagne Occidentale (UBO), Brest Cedex, France
| | - Atanasse Coly
- Laboratoire de Photochimie et d’Analyse (LPA), Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
| | - Philippe Giamarchi
- Laboratoire Matériaux, Electrochimie et Photochimie Analytique, Université A. Diop, Bambey, Senegal
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Bakhoum JP, Diop NA, Bodian EHT, Mbaye OMA, Diaw PA, Cisse L, Gaye-Seye MD, Thiare DD, Coly A, Le Jeune B, Giamarchi P. Micellar enhanced photo-induced fluorescence and absorbance for the development of an on-site early warning water quality monitoring system for pesticides. Analyst 2021; 146:4515-4524. [PMID: 34132727 DOI: 10.1039/d1an00300c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
This paper describes two prototypes of an on-site Early Warning Water Quality Monitoring System (EWWQMS) for pesticide quantification in natural waters. As many pesticides are non-fluorescent, the EWWQMS setup uses UV photoconversion to form highly fluorescent photoproducts. To enhance sensitivity, the two prototypes use micellar-enhanced fluorescence with surfactant (cetyl trimethyl ammonium chloride) in aqueous solution. To improve specificity, four UV LEDs at different wavelengths then excite the fluorescent photoproducts. The EWWQMS prototypes also employ UV absorption for quantification of non-photosensitive pesticides. The first prototype detects the pesticides via a diode array spectrometer. The second system is developed with higher resolution spectrometer and an intensified CCD camera detection to improve the sensitivity of the method. These experimental set-ups are described, explained and tested. Analytical applications were carried out online in CTAC aqueous solution, for the determination of isoproturon, flufenoxuron and profenofos. The calibration curves obtained are linear over one order of magnitude, and the detection limits are in the ng mL-1 range. The analytical performances of these new methods are good compared with other published classical micellar enhanced photo-induced fluorescence methods for the determination of pesticides in aqueous solutions. Our results show that these EWWQMS prototypes can be used as a warning system to protect against pesticide contamination exceeding the threshold of treatment capabilities at industrial facilities using natural waters.
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Affiliation(s)
- Jean-Pierre Bakhoum
- Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Sénégal and OPTIMAG Lab., Brest Univ., 6 Av. Victor Le Gorgeu, 29285 Brest Cedex, France.
| | - Ndeye A Diop
- OPTIMAG Lab., Brest Univ., 6 Av. Victor Le Gorgeu, 29285 Brest Cedex, France. and Lab. Matériaux, Electrochimie et Photochimie Analytique, Univ. A. Diop, Bambey, Sénégal
| | - El Hadji T Bodian
- Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Sénégal and OPTIMAG Lab., Brest Univ., 6 Av. Victor Le Gorgeu, 29285 Brest Cedex, France.
| | | | - Pape A Diaw
- Lab. Matériaux, Electrochimie et Photochimie Analytique, Univ. A. Diop, Bambey, Sénégal
| | - Lamine Cisse
- Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Sénégal
| | - Mame D Gaye-Seye
- Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Sénégal and Lab. Géomatériaux et Environnement, Univ. Paris-Est, 77454 Marne-la-Vallée, France
| | - Diene D Thiare
- Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Sénégal
| | - Atanasse Coly
- Lab. Photochimie et d'Analyse, Univ. C. A. Diop, Dakar, Sénégal
| | - Bernard Le Jeune
- OPTIMAG Lab., Brest Univ., 6 Av. Victor Le Gorgeu, 29285 Brest Cedex, France.
| | - Philippe Giamarchi
- OPTIMAG Lab., Brest Univ., 6 Av. Victor Le Gorgeu, 29285 Brest Cedex, France.
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Bakhoum JP, Diop NA, Bodian EHT, Mbaye OMA, Diaw PA, Cisse L, Gaye-Seye MD, Thiare DD, Coly A, Le Jeune B, Giamarchi P. Development of an on-site early warning water quality monitoring system for pesticide detection by absorption and photo-induced fluorescence. Environ Sci Pollut Res Int 2020; 27:45238-45249. [PMID: 32783180 DOI: 10.1007/s11356-020-10406-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Accepted: 08/04/2020] [Indexed: 06/11/2023]
Abstract
This paper describes prototypes of an on-site early warning water quality monitoring system (EWWQMS) for pesticide quantification in natural waters by fluorescence and absorbance. As many pesticides are not naturally fluorescent, this EWWQMS uses UV irradiation to transform these compounds into highly fluorescent photoproducts and obtain sufficient sensitivity. To obtain a better specificity, the system uses four UV LEDs at different wavelengths to excite the fluorescent photoproducts. For pesticides that are not sensitive to photoconversion, the EWWQMS prototypes also use UV absorption for their quantification, thus offering a wider application range. A first system uses a diode array spectrometer for detection. A second system uses a higher resolution spectrometer and an intensified CCD camera detection to increase sensitivity. Analytical applications were conducted for the determination of fipronil, acetamipride, cyprodinil, trifluraline and pendimethaline in water using both the EWWQMS prototypes. The analytical performances of these new systems are good compared with other photo-induced fluorescence methods already published. Limits of detection without pre-concentration are in the range of 0.2 to 3 ng mL-1 and the recovery values range from 95 to 108%. These results show that the EWWQMS prototypes can be used as an alert system to protect industrial plants from pesticide contaminations that exceed the capabilities of their cleaning processes.
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Affiliation(s)
- Jean-Pierre Bakhoum
- Laboratoire Photochimie et d'Analyse, University. C. A. Diop, Dakar, Sénégal
- OPTIMAG Laboratory, Brest University, 6 Av. Victor Le Gorgeu, 29285, Brest Cedex, France
| | - Ndeye A Diop
- OPTIMAG Laboratory, Brest University, 6 Av. Victor Le Gorgeu, 29285, Brest Cedex, France
- Laboratoire Matériaux, Electrochimie et Photochimie Analytique, University A. Diop, Bambey, Sénégal
| | - El Hadji T Bodian
- Laboratoire Photochimie et d'Analyse, University. C. A. Diop, Dakar, Sénégal
- OPTIMAG Laboratory, Brest University, 6 Av. Victor Le Gorgeu, 29285, Brest Cedex, France
| | - Olivier M A Mbaye
- Laboratoire Photochimie et d'Analyse, University. C. A. Diop, Dakar, Sénégal
| | - Pape A Diaw
- Laboratoire Matériaux, Electrochimie et Photochimie Analytique, University A. Diop, Bambey, Sénégal
| | - Lamine Cisse
- Laboratoire Photochimie et d'Analyse, University. C. A. Diop, Dakar, Sénégal
| | - Mame D Gaye-Seye
- Laboratoire Photochimie et d'Analyse, University. C. A. Diop, Dakar, Sénégal
- Laboratoire Géomatériaux et Environnement, University Paris-Est, 77454, Marne-la-Vallée, France
| | - Diene D Thiare
- Laboratoire Photochimie et d'Analyse, University. C. A. Diop, Dakar, Sénégal
| | - Atanasse Coly
- Laboratoire Photochimie et d'Analyse, University. C. A. Diop, Dakar, Sénégal
| | - Bernard Le Jeune
- OPTIMAG Laboratory, Brest University, 6 Av. Victor Le Gorgeu, 29285, Brest Cedex, France
| | - Philippe Giamarchi
- OPTIMAG Laboratory, Brest University, 6 Av. Victor Le Gorgeu, 29285, Brest Cedex, France.
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8
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El Cheikh A, Pellen F, Le Jeune B, Le Brun G, Abboud M. Single speckle image analysis for monitoring the hardening kinetics of glass ionomer cements. Appl Opt 2020; 59:8828-8833. [PMID: 33104567 DOI: 10.1364/ao.403027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 09/02/2020] [Indexed: 06/11/2023]
Abstract
In this paper, we monitor the setting reaction of commercial glass ionomer cements using a laser speckle technique and adopting a spatial approach in the analysis of recorded speckle images. Experimental results showed that spatial contrast and speckle grain size increased as two studied cements underwent their setting reactions. After combining two geometrical configurations to measure the intensities of backscattered and transmitted light, we concluded that the increase in speckle grain size was caused by an increase in size of the scattering centers, since cement components aggregate and hence transition from a Rayleigh to a Mie scattering regime. Finally, two main phases were distinguished in the hardening process, as reported in the literature; however, the technique we propose has the advantage of easily identifying these two phases. The analysis of a single speckle image offers multiple advantages over the temporal analysis of a series of speckle images, in particular due to the low number of images recorded and a far shorter image processing time.
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Loutfi H, Pellen F, Jeune BL, Lteif R, Kallassy M, Brun GL, Abboud M. Interpretation of the bacterial growth process based on the analysis of the speckle field generated by calibrated scattering media. Opt Express 2020; 28:28648-28655. [PMID: 32988131 DOI: 10.1364/oe.400909] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 07/24/2020] [Indexed: 06/11/2023]
Abstract
The speckle imaging technique has been proven to be a reliable and effective method for real-time monitoring of the growth kinetics of any bacterium in suspension. To understand the interaction between the light and the bacterial density, a simulation of the bacterial growth of Bacillus thuringiensis was performed using calibrated microspheres of different concentrations and sizes. Results show that the decrease of speckle grain size with the increase of the medium scattering coefficient reveals the two essential phases of the bacterial growth: the exponential phase where the number of the bacteria increases and the stationary phase where sporulation and cell lysis occur.
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10
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Loutfi H, Pellen F, Le Jeune B, Lteif R, Kallassy M, Le Brun G, Abboud M. Real-time monitoring of bacterial growth kinetics in suspensions using laser speckle imaging. Sci Rep 2020; 10:408. [PMID: 31941947 PMCID: PMC6962325 DOI: 10.1038/s41598-019-57281-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 12/23/2019] [Indexed: 11/09/2022] Open
Abstract
In microbiology, monitoring the growth of any microorganism in culture is important for studying and optimizing the growth kinetics, the biomass and the metabolite production. In this work, we show that laser speckle imaging is a reliable technique that can be used to perform real-time monitoring of bacteria growth kinetic in liquid culture media. Speckle parameters, specifically speckle grain size and the spatial contrast of the speckle images, and standard analytical parameters (optical density, pH and colony forming units) were measured during the culture of different strains of Bacillus thuringiensis. Our results show that both speckle grain size and spatial contrast decrease with bacterial growth. Furthermore, speckle parameters are sensitive to the fermentation conditions. Statistical analysis revealed a relatively high correlation between speckle and analytical parameters.
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Affiliation(s)
- Hadi Loutfi
- Physics Department, UR TVA, Faculty of Science, Saint Joseph University, B.P. 11-514, Riad El Solh Beirut, 1107 2050, Lebanon. .,Laboratoire OPTIMAG, IBSAM, Université de Bretagne Occidentale, 6 avenue Le Gorgeu, C.S. 93837, 29238, Brest Cedex, 3, France.
| | - Fabrice Pellen
- Laboratoire OPTIMAG, IBSAM, Université de Bretagne Occidentale, 6 avenue Le Gorgeu, C.S. 93837, 29238, Brest Cedex, 3, France
| | - Bernard Le Jeune
- Laboratoire OPTIMAG, IBSAM, Université de Bretagne Occidentale, 6 avenue Le Gorgeu, C.S. 93837, 29238, Brest Cedex, 3, France
| | - Roger Lteif
- Chemistry Department, UR TVA, Faculty of Science, Saint Joseph University, B.P. 11-514, Riad El Solh Beirut, 1107 2050, Lebanon
| | - Mireille Kallassy
- Faculty of Science, Biotechnology Laboratory, UR EGP, Saint Joseph University, B.P. 11-514, Riad El Solh Beirut, 1107 2050, Lebanon
| | - Guy Le Brun
- Laboratoire OPTIMAG, IBSAM, Université de Bretagne Occidentale, 6 avenue Le Gorgeu, C.S. 93837, 29238, Brest Cedex, 3, France.
| | - Marie Abboud
- Physics Department, UR TVA, Faculty of Science, Saint Joseph University, B.P. 11-514, Riad El Solh Beirut, 1107 2050, Lebanon.
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11
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El Cheikh A, Pellen F, Le Jeune B, Le Brun G, Abboud M. Monitoring the curing kinetics of glass ionomer cements by modeling the temporal correlation of speckle images. Appl Opt 2019; 58:7878-7883. [PMID: 31674475 DOI: 10.1364/ao.58.007878] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 09/06/2019] [Indexed: 06/10/2023]
Abstract
Glass ionomer cements (GIC) originated in the mid-twentieth century with the rising demand for dental materials to be biocompatible and cost-effective. Due to their unique ability to bond to tooth structure, coupled with their fluoride-releasing potential, GIC are widely used in pediatric dentistry. However, the curing kinetics of these materials are not extensively documented. In this study, we show that dynamic laser speckle is an efficient method for monitoring the acid-base reaction that occurs during the self-setting of conventional GIC. Plotted temporal correlation curves, showing the degree of similarity between several recorded speckle patterns, indicate that the GIC kinetics reaction slows down during the curing phenomenon. Furthermore, the numerical fit of the temporal correlation curves with a Lorentzian profile gives the characteristic times of the reaction and reveals two phases during GIC hardening.
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12
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Bakhoum JP, Mbaye OMA, Diaw PA, Mbaye M, Cisse L, Gaye-Seye MD, Aaron JJ, Coly A, Le Jeune B, Giamarchi P. Ultraviolet Photo-Induced Fluorescence Followed by Laser Excitation (UV-PIF-LE) for the Determination of Pesticides in Natural Waters. ANAL LETT 2019. [DOI: 10.1080/00032719.2019.1604724] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Jean-Pierre Bakhoum
- Lab. Photochimie et d’Analyse, Univ. C. A. Diop, Dakar, Senegal
- OPTIMAG Lab., Brest Univ., Brest Cedex, France
| | - Olivier M. A. Mbaye
- Lab. Photochimie et d’Analyse, Univ. C. A. Diop, Dakar, Senegal
- OPTIMAG Lab., Brest Univ., Brest Cedex, France
| | - Pape A. Diaw
- Lab. Photochimie et d’Analyse, Univ. C. A. Diop, Dakar, Senegal
- OPTIMAG Lab., Brest Univ., Brest Cedex, France
- Lab. Matériaux, Electrochimie et Photochimie Analytique, Univ. A. Diop, Bambey, Senegal
| | - Moussa Mbaye
- Lab. Photochimie et d’Analyse, Univ. C. A. Diop, Dakar, Senegal
- OPTIMAG Lab., Brest Univ., Brest Cedex, France
| | - Lamine Cisse
- Lab. Photochimie et d’Analyse, Univ. C. A. Diop, Dakar, Senegal
| | - Mame D. Gaye-Seye
- Lab. Photochimie et d’Analyse, Univ. C. A. Diop, Dakar, Senegal
- Lab. Géomatériaux et Environnement, Univ. Paris-Est, Marne-la-Vallée, France
| | - Jean-Jacques Aaron
- Lab. Géomatériaux et Environnement, Univ. Paris-Est, Marne-la-Vallée, France
| | - Atanasse Coly
- Lab. Photochimie et d’Analyse, Univ. C. A. Diop, Dakar, Senegal
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Diaw PA, Mbaye OM, Thiaré DD, Oturan N, Gaye‐Seye MD, Coly A, Le Jeune B, Giamarchi P, Oturan MA, Aaron J. Combination of photoinduced fluorescence and GC–MS for elucidating the photodegradation mechanisms of diflubenzuron and fenuron pesticides. LUMINESCENCE 2019; 34:465-471. [DOI: 10.1002/bio.3612] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2018] [Revised: 01/03/2019] [Accepted: 01/11/2019] [Indexed: 11/12/2022]
Affiliation(s)
- Pape A. Diaw
- Laboratoire MatériauxElectrochimie et Photochimie Analytique ‐ Université Alioune Diop Bambey Sénégal
- Laboratoire de Photochimie et d'AnalyseUniversité Cheikh. Anta Diop Dakar Sénégal
| | - Olivier M.A. Mbaye
- Laboratoire de Photochimie et d'AnalyseUniversité Cheikh. Anta Diop Dakar Sénégal
| | - Diene D. Thiaré
- Laboratoire de Photochimie et d'AnalyseUniversité Cheikh. Anta Diop Dakar Sénégal
| | - Nihal Oturan
- Laboratoire Géomatériaux et Environnement (LGE)Université Paris‐Est Marne‐la‐Vallée 5 boulevard Descartes, Champs‐sur‐Marne Marne‐la‐Vallée Cedex 2 France
| | - Mame Diabou Gaye‐Seye
- Laboratoire de Photochimie et d'AnalyseUniversité Cheikh. Anta Diop Dakar Sénégal
- Laboratoire Géomatériaux et Environnement (LGE)Université Paris‐Est Marne‐la‐Vallée 5 boulevard Descartes, Champs‐sur‐Marne Marne‐la‐Vallée Cedex 2 France
| | - Atanasse Coly
- Laboratoire de Photochimie et d'AnalyseUniversité Cheikh. Anta Diop Dakar Sénégal
| | - Bernard Le Jeune
- Laboratoire OPTIMAG, EA 938, Faculté des SciencesUniversité de Brest 6 Avenue Victor le Gorgeu Brest Cedex France
| | - Philippe Giamarchi
- Laboratoire OPTIMAG, EA 938, Faculté des SciencesUniversité de Brest 6 Avenue Victor le Gorgeu Brest Cedex France
| | - Mehmet A. Oturan
- Laboratoire Géomatériaux et Environnement (LGE)Université Paris‐Est Marne‐la‐Vallée 5 boulevard Descartes, Champs‐sur‐Marne Marne‐la‐Vallée Cedex 2 France
| | - Jean‐Jacques Aaron
- Laboratoire Géomatériaux et Environnement (LGE)Université Paris‐Est Marne‐la‐Vallée 5 boulevard Descartes, Champs‐sur‐Marne Marne‐la‐Vallée Cedex 2 France
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14
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Mbaye M, Diaw PA, Gaye-Saye D, Le Jeune B, Cavalin G, Denis L, Aaron JJ, Delmas R, Giamarchi P. Development of online automatic detector of hydrocarbons and suspended organic matter by simultaneously acquisition of fluorescence and scattering. Spectrochim Acta A Mol Biomol Spectrosc 2018; 192:117-121. [PMID: 29127828 DOI: 10.1016/j.saa.2017.11.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 10/18/2017] [Accepted: 11/01/2017] [Indexed: 06/07/2023]
Abstract
Permanent online monitoring of water supply pollution by hydrocarbons is needed for various industrial plants, to serve as an alert when thresholds are exceeded. Fluorescence spectroscopy is a suitable technique for this purpose due to its sensitivity and moderate cost. However, fluorescence measurements can be disturbed by the presence of suspended organic matter, which induces beam scattering and absorption, leading to an underestimation of hydrocarbon content. To overcome this problem, we propose an original technique of fluorescence spectra correction, based on a measure of the excitation beam scattering caused by suspended organic matter on the left side of the Rayleigh scattering spectral line. This correction allowed us to obtain a statistically validated estimate of the naphthalene content (used as representative of the polyaromatic hydrocarbon contamination), regardless of the amount of suspended organic matter in the sample. Moreover, it thus becomes possible, based on this correction, to estimate the amount of suspended organic matter. By this approach, the online warning system remains operational even when suspended organic matter is present in the water supply.
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Affiliation(s)
- Moussa Mbaye
- Laboratory of Photochemistry and Analyse, Faculty of Science and Technology, University C.A. Diop, Dakar, Senegal
| | - Pape Abdoulaye Diaw
- Laboratory of Photochemistry and Analyse, Faculty of Science and Technology, University C.A. Diop, Dakar, Senegal
| | - Diabou Gaye-Saye
- Laboratory of Photochemistry and Analyse, Faculty of Science and Technology, University C.A. Diop, Dakar, Senegal
| | - Bernard Le Jeune
- Laboratory OPTIMAG, EA 938, Faculty of Science and Technology, Brest University, 6 Avenue Victor Le Gorgeu, 29285 Brest Cedex, France
| | - Goulven Cavalin
- HOCER Instrumentations, 23 Bd Einstein, 44323 Nantes, France
| | - Lydie Denis
- HOCER Instrumentations, 23 Bd Einstein, 44323 Nantes, France
| | - Jean-Jacques Aaron
- Laboratory Géomatériaux et Environnement, EA 4508, Paris-Est University, 77545 Marne-la-Vallée, France
| | - Roger Delmas
- HOCER Instrumentations, 23 Bd Einstein, 44323 Nantes, France
| | - Philippe Giamarchi
- Laboratory OPTIMAG, EA 938, Faculty of Science and Technology, Brest University, 6 Avenue Victor Le Gorgeu, 29285 Brest Cedex, France.
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15
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Nader CA, Loutfi H, Pellen F, Jeune BL, Le Brun G, Lteif R, Abboud M. Assessing White Wine Viscosity Variation Using Polarized Laser Speckle: A Promising Alternative to Wine Sensory Analysis. Sensors (Basel) 2017; 17:E2340. [PMID: 29027936 PMCID: PMC5677228 DOI: 10.3390/s17102340] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Revised: 10/05/2017] [Accepted: 10/10/2017] [Indexed: 12/02/2022]
Abstract
In this paper, we report measurements of wine viscosity, correlated to polarized laser speckle results. Experiments were performed on white wine samples produced with a single grape variety. Effects of the wine making cellar, the grape variety, and the vintage on wine Brix degree, alcohol content, viscosity, and speckle parameters are considered. We show that speckle parameters, namely, spatial contrast and speckle decorrelation time, as well as the inertia moment extracted from the temporal history speckle pattern, are mainly affected by the alcohol and sugar content and hence the wine viscosity. Principal component analysis revealed a high correlation between laser speckle results on the one hand and viscosity and Brix degree values on the other. As speckle analysis proved to be an efficient method of measuring the variation of the viscosity of white mono-variety wine, one can therefore consider it as an alternative method to wine sensory analysis.
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Affiliation(s)
- Christelle Abou Nader
- Physics Department, UR TVA, Faculty of Science, Saint Joseph University, B.P. 11-514-Riad El Solh, Beirut 1107 2050, Lebanon.
| | - Hadi Loutfi
- Physics Department, UR TVA, Faculty of Science, Saint Joseph University, B.P. 11-514-Riad El Solh, Beirut 1107 2050, Lebanon.
| | - Fabrice Pellen
- Laboratoire OPTIMAG (EA 938), Université de Bretagne Occidentale, 29238 Brest CEDEX 3, France.
| | - Bernard Le Jeune
- Laboratoire OPTIMAG (EA 938), Université de Bretagne Occidentale, 29238 Brest CEDEX 3, France.
| | - Guy Le Brun
- Laboratoire OPTIMAG (EA 938), Université de Bretagne Occidentale, 29238 Brest CEDEX 3, France.
| | - Roger Lteif
- Chemistry Department, UR TVA, Faculty of Science, Saint Joseph University, B.P. 11-514-Riad El Solh, Beirut 1107 2050, Lebanon.
| | - Marie Abboud
- Physics Department, UR TVA, Faculty of Science, Saint Joseph University, B.P. 11-514-Riad El Solh, Beirut 1107 2050, Lebanon.
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Alem N, Pellen F, Le Brun G, Le Jeune B. Extra-cavity radiofrequency modulator for a lidar radar designed for underwater target detection. Appl Opt 2017; 56:7367-7372. [PMID: 29048058 DOI: 10.1364/ao.56.007367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Accepted: 07/26/2017] [Indexed: 06/07/2023]
Abstract
The hybrid lidar-radar technique is commonly used for shallow underwater target detection. This technique requires a powerful blue-green RF-modulated laser with stable microwave frequency. In this paper, a novel modulator design perfectly suited for this application is proposed. It consists of an extra-cavity modulator composed of two plane mirrors and a second-harmonic generator stage within the cavity to maximize the energy efficiency. This modulator is coupled with a picosecond Nd:YAG infrared laser source to insure the emission of a powerful pulse (up to 5 mJ). Results considering this architecture show stable modulation frequency and a powerful modulated beam. As the emitted signal lasts only a few nanoseconds, a range-gating method can be used for target localization. This emitted signal has experimentally proven to preserve input beam polarization, which also can be employed to enhance the target return.
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17
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Abou Nader C, Pellen F, Loutfi H, Mansour R, Le Jeune B, Le Brun G, Abboud M. Early diagnosis of teeth erosion using polarized laser speckle imaging. J Biomed Opt 2016; 21:71103. [PMID: 26720050 DOI: 10.1117/1.jbo.21.7.071103] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 11/10/2015] [Indexed: 06/05/2023]
Abstract
Dental erosion starts with a chemical attack on dental tissue causing tooth demineralization, altering the tooth structure and making it more sensitive to mechanical erosion. Medical diagnosis of dental erosion is commonly achieved through a visual inspection by the dentist during dental checkups and is therefore highly dependent on the operator's experience. The detection of this disease at preliminary stages is important since, once the damage is done, cares become more complicated. We investigate the difference in light-scattering properties between healthy and eroded teeth. A change in light-scattering properties is observed and a transition from volume to surface backscattering is detected by means of polarized laser speckle imaging as teeth undergo acid etching, suggesting an increase in enamel surface roughness.
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Affiliation(s)
- Christelle Abou Nader
- Saint Joseph University, Physics Department, Faculty of Science, UR TVA, B.P. 11-514-Riad El Solh, Beirut 1107 2050, LebanonbUniversité de Bretagne Occidentale, UEB, EA 938 Laboratoire de Spectrométrie et Optique Laser, IBSAM, 6 avenue le Gorgeu, C.S. 938
| | - Fabrice Pellen
- Université de Bretagne Occidentale, UEB, EA 938 Laboratoire de Spectrométrie et Optique Laser, IBSAM, 6 avenue le Gorgeu, C.S. 93837, 29238 Brest Cedex 3, France
| | - Hadi Loutfi
- Saint Joseph University, Physics Department, Faculty of Science, UR TVA, B.P. 11-514-Riad El Solh, Beirut 1107 2050, Lebanon
| | - Rassoul Mansour
- Saint Joseph University, Physics Department, Faculty of Science, UR TVA, B.P. 11-514-Riad El Solh, Beirut 1107 2050, Lebanon
| | - Bernard Le Jeune
- Université de Bretagne Occidentale, UEB, EA 938 Laboratoire de Spectrométrie et Optique Laser, IBSAM, 6 avenue le Gorgeu, C.S. 93837, 29238 Brest Cedex 3, France
| | - Guy Le Brun
- Université de Bretagne Occidentale, UEB, EA 938 Laboratoire de Spectrométrie et Optique Laser, IBSAM, 6 avenue le Gorgeu, C.S. 93837, 29238 Brest Cedex 3, France
| | - Marie Abboud
- Saint Joseph University, Physics Department, Faculty of Science, UR TVA, B.P. 11-514-Riad El Solh, Beirut 1107 2050, Lebanon
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18
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Nader CA, Pellen F, Roquefort P, Aubry T, Le Jeune B, Le Brun G, Abboud M. Evaluation of low viscosity variations in fluids using temporal and spatial analysis of the speckle pattern. Opt Lett 2016; 41:2521-2524. [PMID: 27244404 DOI: 10.1364/ol.41.002521] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The noninvasive detection of a material's viscoelasticity is of great importance in the medical field. In fact, certain diseases cause changes in tissue structure and biological fluid viscosity; tracking those changes allows for detection of these diseases. Rheological measurements are also imperative in the industrial field, where it is necessary to characterize a material's viscoelasticity for manufacturing purposes. In this Letter, we present a noncontact, noninvasive, and low cost method for determining low viscosity values and variations in fluids. Laser speckle and viscometric measurements are performed on test samples having low scattering coefficients and low viscosities. The speckle spatial analysis proved to be as accurate as the speckle temporal correlation method reported in previous studies. Very low viscosities of the order of 1 mPa.s were retrieved for the first time using speckle images with either a frame rate of 1950 fps or a single acquired image.
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Nader CA, Nassif R, Pellen F, Le Jeune B, Le Brun G, Abboud M. Influence of size, proportion, and absorption coefficient of spherical scatterers on the degree of light polarization and the grain size of speckle pattern. Appl Opt 2015; 54:10369-10375. [PMID: 26836860 DOI: 10.1364/ao.54.010369] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this paper, we present the evolution of speckle pattern polarimetric parameters in response to controlled changes in scatterer sizes, proportions, and the absorption coefficient in media. The experimental study was performed on mixtures of polystyrene microspheres with dye in order to ensure biological medium-like properties. The speckle grain sizes and degrees of polarization for linear and circular light were monitored. We observed helicity flipping in the degree of circular polarization for small scatterer proportion around 25%. Furthermore, linear depolarization decreased slightly for media containing more small particles. Good agreement was shown with numerical results computed using a Monte Carlo simulation of polarized light taking into account our experimental configuration. Speckle grain size also evolves with the increase of small scatterers as well as the media absorption coefficient. Such variations of properties are encountered during fruit maturation, in tissues in precancerous stages, and any transformation that causes a modification in particle proportions and absorption coefficient in biological media. The computed parameters proved to be sensitive to these changes.
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Martin L, Le Brun G, Le Jeune B, Pellen F, Rivet S. Analysis of experimental depolarizing Mueller matrices through a hybrid decomposition. Appl Opt 2015; 54:27-36. [PMID: 25967003 DOI: 10.1364/ao.54.000027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Accepted: 11/17/2014] [Indexed: 06/04/2023]
Abstract
We propose a new decomposition for depolarizing Mueller matrices. This decomposition, which consists of a product of four basic optical devices (two diattenuators, a retarder, and a depolarizer) is derived from a previous one known as "symmetric decomposition" [J. Opt. Soc. Am. A26, 1109 (2009)10.1364/JOSAA.26.001109JOAOD61084-7529] and makes it easier to interpret polarization properties of Mueller matrices and improves estimation of the extracted parameters. Its application is illustrated by several theoretical and experimental examples.
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Nassif R, Nader CA, Afif C, Pellen F, Le Brun G, Le Jeune B, Abboud M. Detection of Golden apples' climacteric peak by laser biospeckle measurements. Appl Opt 2014; 53:8276-8282. [PMID: 25608070 DOI: 10.1364/ao.53.008276] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this paper, we report a study in which a laser biospeckle technique is used to detect the climacteric peak indicating the optimal ripeness of fruits. We monitor two batches of harvested Golden apples going through the ripening phase in low- and room-temperature environments, determine speckle parameters, and measure the emitted ethylene concentration using gas chromatography as reference method. Speckle results are then correlated to the emitted ethylene concentration by a principal component analysis. From a practical point of view, this approach allows us to validate biospeckle as a noninvasive and alternative method to respiration rate and ethylene production for climacteric peak detection as a ripening index.
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Nassif R, Abou Nader C, Pellen F, Le Brun G, Abboud M, Le Jeune B. Retrieving controlled motion parameters using two speckle pattern analysis techniques: spatiotemporal correlation and the temporal history speckle pattern. Appl Opt 2013; 52:7564-7569. [PMID: 24216659 DOI: 10.1364/ao.52.007564] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Accepted: 10/09/2013] [Indexed: 06/02/2023]
Abstract
This paper presents simulation of speckle activity through controlling a moving plate. We present two procedures to extract the initial movement frequency and amplitude, either through correlation calculus or through processing the temporal history of the speckle pattern. We compare and discuss these two methods in terms of efficiency and the ability to retrieve motion parameters. The correlation technique seems to be more suitable for monitoring biospeckle activity as it provides more reliable parameter estimation than the temporal history of the speckle pattern. The evolution of temporal history of the speckle pattern parameters and their response sensibility with amplitude and frequency variations have been studied and quantified. Briers contrast appears to depend only on movement amplitude, whereas inertia moment varies with amplitude and frequency.
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23
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Babilotte P, Silva VNH, Dubreuil M, Rivet S, Dupont L, Le Jeune B. Impact of the concentration in polymer on the dynamic behavior of Polymer Stabilized Ferroelectric Liquid Crystal using Snap-shot Mueller Matrix Polarimetry. Eur Phys J E Soft Matter 2013; 36:55. [PMID: 23715883 DOI: 10.1140/epje/i2013-13055-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Revised: 02/17/2013] [Accepted: 04/25/2013] [Indexed: 06/02/2023]
Abstract
Experimental results are presented related to the dynamic behaviour of Polymer Stabilized Ferro-electric Liquid Crystal (PSFLC) samples under external applied electric field, using Snap-shot Mueller Matrix Polarimetry (SMMP) and Mueller Matrix (MM) formalism. Different polarimetric coefficients are simultaneously extracted from each channeled spectrum measured with this full-optical SMMP technique. The impact of the concentration of polymer present into the liquid crystal cell on this dynamic behaviour is studied, permitting a direct and quick characterisation of the material. The results obtained for PSFLC are compared with those already measured for pure Surface Stabilized Ferro-electric Liquid Crystal (SSFLC) samples, which correspond to a 0% concentration in polymer.
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Affiliation(s)
- Philippe Babilotte
- Université Europeenne de Bretagne, 5 Boulevard Laennec, 35000, Rennes, France.
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24
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Pellen F, Jezequel V, Zion G, Jeune BL. Detection of an underwater target through modulated lidar experiments at grazing incidence in a deep wave basin. Appl Opt 2012; 51:7690-7700. [PMID: 23128721 DOI: 10.1364/ao.51.007690] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Accepted: 10/03/2012] [Indexed: 06/01/2023]
Abstract
The effectiveness of a pulsed radiofrequency modulated lidar and associated processing for underwater target detection at grazing incidence was experimentally assessed in a wave basin 50 m long and 20 m deep, under different conditions of swell produced within this facility to benefit from a controlled interface. This paper reports our experiments and offline data processing results, and describes significant improvements in the probability of detection that demonstrate the interest of using such a technique in this context.
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Affiliation(s)
- Fabrice Pellen
- Université Européenne de Bretagne, Université de Bretagne Occidentale, Laboratoire de Spectrométrie et Optique Laser, Brest, France. fabrice.pellen@univ‐brest.fr
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25
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Dubreuil M, Babilotte P, Martin L, Sevrain D, Rivet S, Le Grand Y, Le Brun G, Turlin B, Le Jeune B. Mueller matrix polarimetry for improved liver fibrosis diagnosis. Opt Lett 2012; 37:1061-3. [PMID: 22446225 DOI: 10.1364/ol.37.001061] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
An experimental Mueller matrix polarimeter is used to quantify human liver fibrosis by measuring retardance and depolarization of thin biopsies. The former parameter is sensitive to fibrillar collagen, the latter is specifically sensitive to fibrillar collagen around blood vessels, which is not significant for liver fibrosis diagnosis. By using depolarization like a filter, retardance distribution enables distinguishing between disease stages and limits the high degree of observer discrepancy.
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Affiliation(s)
- Matthieu Dubreuil
- Université de Brest, UEB, EA 938 Laboratoire de Spectrométrie et Optique Laser, Brest, France. matthieu.dubreuil@univ‑brest.fr
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26
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Dubreuil M, Rivet S, Le Jeune B, Dupont L. Time-resolved switching analysis of a ferroelectric liquid crystal by snapshot Mueller matrix polarimetry. Opt Lett 2010; 35:1019-1021. [PMID: 20364203 DOI: 10.1364/ol.35.001019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
An experimental snapshot Mueller matrix polarimeter based on wavelength polarization coding is used to get a time-resolved description of electric-field-induced fast transition within a ferroelectric liquid-crystal cell. The parameters extracted from experimental Mueller matrices are linked to the molecule director distribution to further determine the average trajectory and the collective behavior of these molecules while they switch over to another state.
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Affiliation(s)
- Matthieu Dubreuil
- Université Européenne de Bretagne, 5 Boulevard Laennec, 3500 Rennes, France.
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Dubreuil M, Rivet S, Le Jeune B, Cariou J. Two-channel snapshot Mueller matrix polarimeter. Appl Opt 2009; 48:6501-6505. [PMID: 19935972 DOI: 10.1364/ao.48.006501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We describe a new setup for a snapshot Mueller matrix polarimeter (SMMP). It relies on the separation and orthogonal polarization of two light beams by a Wollaston prism located at the setup output. The simultaneous treatment of the two spectra allows an enhancement of accuracy for real-time measurements through reduction of the effects caused by random noise and systematic errors. Moreover, it gives insight into the nonuniform spectral response of the medium under study. Experimental results support the feasibility of the proposed technique.
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Affiliation(s)
- Matthieu Dubreuil
- Université Européenne de Bretagne, 5 bd Laënnec, 35000 Rennes, France.
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28
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Abstract
Systematic errors specific to a snapshot Mueller matrix polarimeter are studied. Their origins and effects are highlighted, and solutions for correction and stabilization are proposed. The different effects induced by them are evidenced by experimental results acquired with a given setup and theoretical simulations carried out for more general cases. We distinguish the errors linked to some imperfection of elements in the experimental setup from those linked to the sample under study.
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Affiliation(s)
- Matthieu Dubreuil
- Université de Brest, Laboratoire de Spectrométrie et Optique Laser, Brest Cedex, France.
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Abstract
We report on the optimization of a snapshot Mueller matrix polarimeter performed by using singular-value decomposition. The snapshot technique relies on wavelength polarization coding by four wave plates. The statistical noise on Mueller components is minimized through adjustment of the thickness of each plate. The spectrometer response and its cutoff frequency were considered to find the optimal configurations described here.
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Affiliation(s)
- Paul Lemaillet
- Laboratoire de Spectrométrie et Optique Laser E.A. 938, Université de Bretagne Occidentale, 6 Avenue le Gorgeu, CS 93837, 29238 Brest Cedex, France.
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Dubreuil M, Rivet S, Le Jeune B, Cariou J. Snapshot Mueller matrix polarimeter by wavelength polarization coding. Opt Express 2007; 15:13660-8. [PMID: 19550636 DOI: 10.1364/oe.15.013660] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We present a new, to the best of our knowledge, experimental configuration of Mueller matrix polarimeter based on wavelength polarization coding. This is a compact and fast technique to study polarization phenomena. Our theoretical approach, the necessity to correct systematic errors and our experimental results are presented. The feasibility of the technique is tested on vacuum and on a linear polarizer.
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Lemaillet P, Rivet S, Pellen F, Le Jeune B, Cariou J. Second-harmonic-generation-polarimeter calibration by means of a quartz plate. Appl Opt 2007; 46:4793-803. [PMID: 17609729 DOI: 10.1364/ao.46.004793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
A dual-rotating-retarder polarimeter was used to determine the six measurable observables of the first hyperpolarizability tensor. Calibration of such an instrument requires a reference sample dedicated to wavelength conversion. We calibrated our experimental setup by using a quartz-plate sample in a two step procedure: at first the first retarder then the second one. The retardance and ellipticity angle of both retarders were estimated by minimizing a chi(2) function. We estimated the standard deviation of each parameter from noise spreading and performed this calibration procedure for two experimental case studies, i.e., two angular positions of the quartz sample.
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Piederrière Y, Cariou J, Guern Y, Le Brun G, Le Jeune B, Lotrian J, Abgrall JF, Blouch MT. Evaluation of blood plasma coagulation dynamics by speckle analysis. J Biomed Opt 2004; 9:408-412. [PMID: 15065909 DOI: 10.1117/1.1645799] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Analysis of speckle dynamics is frequently used to study the motion of scattered objects or liquids. By assessing the increase in contrast on the speckle field produced by a blood plasma sample, illuminated by a laser during a coagulation test, as well as the slowing down of speckle fluctuations, we measured the time required for blood plasma coagulation in vitro and evidence the process dynamics. Then, we compared this noninvasive method with a mechanical viscosity-based detection system classically used in hematology laboratories; our results show good correlation and could provide more information about the blood clotting process.
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Affiliation(s)
- Yann Piederrière
- UFR Sciences, Laboratoire de Spectrometrie et Optique Laser, 6 Avenue Le Gorgeu, 29285 Brest Cedex, France.
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Abstract
In underwater optical imaging using pulsed laser radiation the vector nature of the electromagnetic wave can be used to produce polarization contrast. We have analyzed different polarimetric transformations of light pulses through seawater on immersed targets and defined optimum conditions for using polarization parameters.
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