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Rourke PMC, Gaiser C, Gao B, Ripa DM, Moldover MR, Pitre L, Underwood RJ. Refractive-index gas thermometry. METROLOGIA 2019; 56:10.1088/1681-7575/ab0dbe. [PMID: 31274930 PMCID: PMC6605082 DOI: 10.1088/1681-7575/ab0dbe] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The principles and techniques of primary refractive-index gas thermometry (RIGT) are reviewed. Absolute primary RIGT using microwave measurements of helium-filled quasispherical resonators has been implemented at the temperatures of the triple points of neon, oxygen, argon and water, with relative standard uncertainties ranging from 9.1 × 10-6 to 3.5 × 10-5. Researchers are now also using argon-filled cylindrical microwave resonators for RIGT near ambient temperature, with relative standard uncertainties between 3.8 × 10-5 and 4.6 × 10-5, and conducting relative RIGT measurements on isobars at low temperatures. RIGT at optical frequencies is progressing, and has been used to perform a Boltzmann constant measurement at room temperature with a relative standard uncertainty of 1.2 × 10-5. Uncertainty budgets from implementations of absolute primary microwave RIGT, relative primary microwave RIGT and absolute primary optical RIGT are provided.
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Affiliation(s)
| | - Christof Gaiser
- Physikalisch-Technische Bundesanstalt (PTB), Abbestrasse 2-12, 10587 Berlin, Germany
| | - Bo Gao
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Daniele Madonna Ripa
- Applied Metrology and Engineering Division, Istituto Nazionale di Ricerca Metrologica (INRiM), 10135 Turin, Italy
| | - Michael R Moldover
- Sensor Science Division, National Institute of Standards and Technology, Gaithersburg, MD 20899-8360, United States of America
| | - Laurent Pitre
- Laboratoire Commun de Métrologie LNE-Cnam (LCM), 93210 La Plaine Saint-Denis, France
| | - Robin J Underwood
- National Physical Laboratory, Teddington, Middlesex TW11 0LW, United Kingdom
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Rdzanek WP. Sound scattering and transmission through a circular cylindrical aperture revisited using the radial polynomials. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2018; 143:1259. [PMID: 29604683 DOI: 10.1121/1.5025159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The problem of sound scattering and transmission through a circular cylindrical aperture in a flat thick rigid wall has been revisited rigorously using the radial polynomials. The acoustic power transmission and back scattering coefficients have been presented in the form of highly convergent hypergeometric series described earlier in the literature for vibrating circular pistons and plates based on the crucial property of the polynomials in terms of the Hankel transform. The problem is solved by using the continuity conditions at both aperture outlets. The complex integrals necessary to satisfy the continuity conditions are expressed as the exact formulas, which makes the final results for the acoustic power coefficients much more accurate than in the case of numerical integration. A significant improvement has also been reached in numerical efficiency. On average, the calculations are 500 times more efficient compared to numerical integration with no accuracy loss. Additionally, the acoustic pressure on the aperture outlets has been presented exactly in the form of a highly convergent hypergeometric series as well as using the modal impedance coefficients.
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Affiliation(s)
- Wojciech P Rdzanek
- Faculty of Mathematics and Natural Sciences, Department of Mechatronics and Control Science, University of Rzeszów, Pigonia 1, Rzeszów, PL-35-310, Poland
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Sharipov F, Moldover MR. Energy accommodation coefficient extracted from acoustic resonator experiments. JOURNAL OF VACUUM SCIENCE & TECHNOLOGY. A, VACUUM, SURFACES, AND FILMS : AN OFFICIAL JOURNAL OF THE AMERICAN VACUUM SOCIETY 2016; 34:061604. [PMID: 28970648 PMCID: PMC5621611 DOI: 10.1116/1.4966620] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We review values of the temperature jump coefficient ζT determined from measurements of the acoustic resonance frequencies facoust of helium-filled and argon-filled, spherical cavities near ambient temperature. We combine these values of ζT with literature data for tangential momentum accommodation coefficient (TMAC) and the Cercignani-Lampis model of the gas-surface interaction to obtain measurement-derived values of the normal energy accommodation coefficient (NEAC). We found that NEAC ranges from 0 to 0.1 for helium and from 0.61 to 0.85 for argon at ambient temperature for several different surfaces. We suggest that measurements of facoust of gas-filled, cylindrical cavities and of the non-radial modes of quasi-spherical cavities might separately determine TMAC and NEAC. Alternatively, TMAC and NEAC could be determined by measuring the heat transfer and momentum transfer between parallel rotating discs at low pressure.
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Affiliation(s)
- Felix Sharipov
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - Michael R Moldover
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
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Gavioso RM, Ripa DM, Steur PPM, Gaiser C, Zandt T, Fellmuth B, de Podesta M, Underwood R, Sutton G, Pitre L, Sparasci F, Risegari L, Gianfrani L, Castrillo A, Machin G. Progress towards the determination of thermodynamic temperature with ultra-low uncertainty. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2016; 374:20150046. [PMID: 26903096 DOI: 10.1098/rsta.2015.0046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 12/02/2015] [Indexed: 06/05/2023]
Abstract
Previous research effort towards the determination of the Boltzmann constant has significantly improved the supporting theory and the experimental practice of several primary thermometry methods based on the measurement of a thermodynamic property of a macroscopic system at the temperature of the triple point of water. Presently, experiments are under way to demonstrate their accuracy in the determination of the thermodynamic temperature T over an extended range spanning the interval between a few kelvin and the copper freezing point (1358 K). We discuss how these activities will improve the link between thermodynamic temperature and the temperature as measured using the International Temperature Scale of 1990 (ITS-90) and report some preliminary results obtained by dielectric constant gas thermometry and acoustic gas thermometry. We also provide information on the status of other primary methods, such as Doppler broadening thermometry, Johnson noise thermometry and refractive index gas thermometry. Finally, we briefly consider the implications of these advancements for the dissemination of calibrated temperature standards.
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Affiliation(s)
- Roberto M Gavioso
- Istituto Nazionale di Ricerca Metrologica (INRiM), 91 Strada delle Cacce, 10135 Torino, Italy
| | - Daniele Madonna Ripa
- Istituto Nazionale di Ricerca Metrologica (INRiM), 91 Strada delle Cacce, 10135 Torino, Italy
| | - Peter P M Steur
- Istituto Nazionale di Ricerca Metrologica (INRiM), 91 Strada delle Cacce, 10135 Torino, Italy
| | - Christof Gaiser
- Physikalisch-Technische Bundesanstalt (PTB), Abbestrasse 2-12, 10587 Berlin, Germany
| | - Thorsten Zandt
- Physikalisch-Technische Bundesanstalt (PTB), Abbestrasse 2-12, 10587 Berlin, Germany
| | - Bernd Fellmuth
- Physikalisch-Technische Bundesanstalt (PTB), Abbestrasse 2-12, 10587 Berlin, Germany
| | | | | | - Gavin Sutton
- National Physical Laboratory (NPL), Teddington TW11 0LW, UK
| | - Laurent Pitre
- Laboratoire Commun de Métrologie, LNE-CNAM, 61 Rue du Landy, 93210 La Plaine Saint-Denis, France
| | - Fernando Sparasci
- Laboratoire Commun de Métrologie, LNE-CNAM, 61 Rue du Landy, 93210 La Plaine Saint-Denis, France
| | - Lara Risegari
- Laboratoire Commun de Métrologie, LNE-CNAM, 61 Rue du Landy, 93210 La Plaine Saint-Denis, France
| | - Livio Gianfrani
- Dipartimento di Matematica e Fisica, Seconda Università di Napoli, Viale Lincoln 5, 81100 Caserta, Italy
| | - Antonio Castrillo
- Dipartimento di Matematica e Fisica, Seconda Università di Napoli, Viale Lincoln 5, 81100 Caserta, Italy
| | - Graham Machin
- National Physical Laboratory (NPL), Teddington TW11 0LW, UK
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