Digital holographic measurements of shape and three-dimensional sound-induced displacements of tympanic membrane

Morteza Khaleghi; Weina Lu; Ivo Dobrev; Jeffrey Tao Cheng; Cosme Furlong; John Rosowski

doi:10.1117/1.OE.52.10.101916

17 July 2013 Digital holographic measurements of shape and three-dimensional sound-induced displacements of tympanic membrane

Morteza Khaleghi, Weina Lu, Ivo Dobrev, Jeffrey Tao Cheng, Cosme Furlong, John Rosowski

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Optical Engineering, Vol. 52, Issue 10, 101916 (July 2013). https://doi.org/10.1117/1.OE.52.10.101916

Abstract

Acoustically induced vibrations of the tympanic membrane (TM) play a primary role in the hearing process, in that these motions are the initial mechanical response of the ear to airborne sound. Characterization of the shape and three-dimensional (3-D) displacement patterns of the TM is a crucial step to a better understanding of the complicated mechanics of sound reception by the ear. Sound-induced 3-D displacements of the TM are estimated from shape and one-dimensional displacements measured in cadaveric chinchillas using a lensless dual-wavelength digital holography system (DWDHS). The DWDHS consists of laser delivery, optical head, and computing platform subsystems. Shape measurements are performed in double-exposure mode with the use of two wavelengths of a tunable laser, while nanometer-scale displacements are measured along a single sensitivity direction with a constant wavelength. Taking into consideration the geometrical and dimensional constrains imposed by the anatomy of the TM, we combine principles of thin-shell theory together with displacement measurements along a single sensitivity vector and TM surface shape to extract the three principal components of displacement in the full-field-of-view. We test, validate, and identify limitations of this approach via the application of finite element method to artificial geometries.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Morteza Khaleghi, Weina Lu, Ivo Dobrev, Jeffrey Tao Cheng, Cosme Furlong, and John Rosowski "Digital holographic measurements of shape and three-dimensional sound-induced displacements of tympanic membrane," Optical Engineering 52(10), 101916 (17 July 2013). https://doi.org/10.1117/1.OE.52.10.101916

Published: 17 July 2013

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