Abstract
The acousto-mechanical-transformer behavior of the Tympanic Membrane (TM) is defined by its shape, 3D displacements, and mechanical properties. In this paper, we report the quantification of these characteristics by full-field-of-view optoelectronic techniques. Due to geometrical constraints imposed by the ear canal, however, 3D displacement measurements with multiple sensitivity vectors in holographic interferometry or 3D Laser Doppler Vibrometry (LDV) have limited applications for testing in vivo. Therefore, we seek alternative methods to perform 3D measurements. In our work, we hypothesize that the TM behaves as a thin-shell, so that the principal components of vibration are parallel to the TM’s shape normal vectors, which allows the estimation of the 3D components of displacement with only 1D component of displacements and shape information. Full-field-of-view measurements of the TM are obtained with our digital holographic system, with shape measured in two-wavelength mode and 1D displacements measured in single-wavelength mode. The theoretically-estimated 3D components of displacement are then compared with those measured by methods of multiple sensitivity vectors. Preliminary data suggest that the thin-shell hypothesis is applicable for estimation of the 3D acoustically-induced vibrations of the TM excited at low and mid frequency ranges.
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Acknowledgements
This work has been funded by the National Institute on Deafness and Other Communication Disorders (NIDCD), the National Institute of Health (NIH), the Massachusetts Eye and Ear Infirmary (MEEI), and the Mittal Fund.
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Khaleghi, M., Furlong, C., Cheng, J.T., Rosowski, J.J. (2015). Thin-Shell Behavior of Mammalian Tympanic Membrane Studied by Digital Holography. In: Barthelat, F., Korach, C., Zavattieri, P., Prorok, B., Grande-Allen, K. (eds) Mechanics of Biological Systems and Materials, Volume 7. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-06974-6_3
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DOI: https://doi.org/10.1007/978-3-319-06974-6_3
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