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4 February 2015 Three-dimensional vibrometry of the human eardrum with stroboscopic lensless digital holography
Morteza Khaleghi, Cosme Furlong, Mike Ravicz, Jeffrey T. Cheng, John Rosowski
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Journal of Biomedical Optics, Vol. 20, Issue 5, 051028 (February 2015). https://doi.org/10.1117/1.JBO.20.5.051028
Abstract
The eardrum or tympanic membrane (TM) transforms acoustic energy at the ear canal into mechanical motions of the ossicles. The acousto-mechanical transformer behavior of the TM is determined by its shape, three-dimensional (3-D) motion, and mechanical properties. We have developed an optoelectronic holographic system to measure the shape and 3-D sound-induced displacements of the TM. The shape of the TM is measured with dual-wavelength holographic contouring using a tunable near IR laser source with a central wavelength of 780 nm. 3-D components of sound-induced displacements of the TM are measured with the method of multiple sensitivity vectors using stroboscopic holographic interferometry. To accurately obtain sensitivity vectors, a new technique is developed and used in which the sensitivity vectors are obtained from the images of a specular sphere that is being illuminated from different directions. Shape and 3-D acoustically induced displacement components of cadaveric human TMs at several excitation frequencies are measured at more than one million points on its surface. A numerical rotation matrix is used to rotate the original Euclidean coordinate of the measuring system in order to obtain in-plane and out-of-plane motion components. Results show that in-plane components of motion are much smaller (<20%) than the out-of-plane motions’ components.
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, Cosme Furlong, Mike Ravicz, Jeffrey T. Cheng, and John Rosowski "Three-dimensional vibrometry of the human eardrum with stroboscopic lensless digital holography," Journal of Biomedical Optics 20(5), 051028 (4 February 2015). https://doi.org/10.1117/1.JBO.20.5.051028
Published: 4 February 2015
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Cited by 32 scholarly publications.
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KEYWORDS
Holography
3D metrology
Holograms
Vibrometry
Digital holography
Ear
Optical spheres
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