Three-dimensional vibration of the stapes measured with a heterodyne interferometer

Willem F. Decraemer; Shyam M. Khanna

doi:10.1117/12.307741

1 June 1998 Three-dimensional vibration of the stapes measured with a heterodyne interferometer

Willem F. Decraemer, Shyam M. Khanna

Proceedings Volume 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1998) https://doi.org/10.1117/12.307741
Event: Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 1998, Ancona, Italy

Abstract

The acoustical energy is transmitted for the tympanic membrane to the inner ear by the middle ear ossicles. It is generally accepted that the ossicles rotate around a fixed axis and function as mechanical levers.Under this concept the motions of malleus and stapes are 1D. A series of measurements of malleus vibration made through the intact ear canal has clearly shown that the malleus motion is not a rotation about a fixed suspension axis but that translation and rotation components in all three dimensions are present and change dramatically over the frequency of hearing. An important question is what role these 3D vibrations play in the function of hearing. If the three components of vibration were utilized in the stimulation of the inner ear, they should also be present in the motion of the stapes. The motion of the stapes has been difficult to measure in the past because access is limited and only a small portion of the crura can be seen. In order to get a better access to the stapes a novel preparation of the cat temporal bone was utilized. To determine its 3D motion, the vibration of the stapes was measured wit a confocal heterodyne interferometer at three points form different viewing angles.Its geometry was also measured. Assuming that the system behaves as a rigid body this data was used to generate an animation of the stapes motion. The stapes motion was found to be three dimensional. This suggests that these vibrations play a functional role in hearing.

Citation Download Citation

Willem F. Decraemer and Shyam M. Khanna "Three-dimensional vibration of the stapes measured with a heterodyne interferometer", Proc. SPIE 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (1 June 1998); https://doi.org/10.1117/12.307741

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