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Tang H, Psota P, Rosowski JJ, Furlong C, Cheng JT. Analyses of the Tympanic Membrane Impulse Response Measured with High-Speed Holography. Hear Res 2021; 410:108335. [PMID: 34450569 DOI: 10.1016/j.heares.2021.108335] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 08/02/2021] [Accepted: 08/04/2021] [Indexed: 10/20/2022]
Abstract
The Tympanic Membrane (TM) transforms acoustic energy to ossicular vibration. The shape and the displacement of the TM play an important role in this process. We developed a High-speed Digital Holography (HDH) system to measure the shape and transient displacements of the TM induced by acoustic clicks. The displacements were further normalized by the measured shape to derive surface normal displacements at over 100,000 points on the TM surface. Frequency and impulse response analyses were performed at each TM point, which enable us to describe 2D surface maps of four new TM mechanical parameters. From frequency domain analyses, we describe the (i) dominant frequencies of the displacement per sound pressure based on Frequency Response Function (FRF) at each surface point. From time domain analyses, we describe the (ii) rising time, (iii) exponential decay time, and the (iv) root-mean-square (rms) displacement of the TM based on Impulse Response Function (IRF) at each surface point. The resultant 2D maps show that a majority of the TM surface has a dominant frequency of around 1.5 kHz. The rising times suggest that much of the TM surface is set into motion within 50 µs of an impulsive stimulus. The maps of the exponential decay time of the IRF illustrate spatial variations in damping, the least known TM mechanical property. The damping ratios at locations with varied dominant frequencies are quantified and compared.
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Affiliation(s)
- H Tang
- Center for Holographic Studies and Laser Micro-mechaTronics (CHSLT), Worcester Polytechnic Institute, Worcester, MA United States; Mechanical Engineering Department, Worcester Polytechnic Institute, Worcester, MA United States; Eaton-Peabody Laboratory, Massachusetts Eye and Ear Infirmary, Boston, MA United States.
| | - P Psota
- Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Liberec, Czech Republic
| | - J J Rosowski
- Eaton-Peabody Laboratory, Massachusetts Eye and Ear Infirmary, Boston, MA United States; Department of Otolaryngology-Head and Neck Surgery, Harvard Medical School, Boston, MA, United States
| | - C Furlong
- Center for Holographic Studies and Laser Micro-mechaTronics (CHSLT), Worcester Polytechnic Institute, Worcester, MA United States; Mechanical Engineering Department, Worcester Polytechnic Institute, Worcester, MA United States; Eaton-Peabody Laboratory, Massachusetts Eye and Ear Infirmary, Boston, MA United States; Department of Otolaryngology-Head and Neck Surgery, Harvard Medical School, Boston, MA, United States
| | - J T Cheng
- Eaton-Peabody Laboratory, Massachusetts Eye and Ear Infirmary, Boston, MA United States; Department of Otolaryngology-Head and Neck Surgery, Harvard Medical School, Boston, MA, United States
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Doleček R, Psota P, Lédl V, Vít T, Kopecký V. Comparison of holographic setups used in heat and mass transfer measurement. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146702021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Doleček R, Kopecký V, Psota P, Lédl V. Digital Holographic setup for Measurement of Asymmetric Temperature Field and Tomographic Reconstruction. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20134800003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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