Laser interferometry for ear ossicular motion detection

Joseph J. Suter; Jay C. Poret; Doug E. Mattox

doi:10.1117/12.180751

28 July 1994 Laser interferometry for ear ossicular motion detection

Joseph J. Suter, Jay C. Poret, Doug E. Mattox

Proceedings Volume 2131, Biomedical Fiber Optic Instrumentation; (1994) https://doi.org/10.1117/12.180751
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

The emphasis of this project has been to initially detect the displacements of the eardrum by using a laser interferometer. A small cobalt-samarium magnet (typically weighing less than 4 mg) was placed on human cadaver eardrums and positioned inside a solenoid coil. An ac modulated signal, having a frequency range of 500 - 2500 Hz, was passed through the coil. This signal created an ac magnetic field inside the coil that caused the magnet to vibrate at the modulation frequency. A commercial (TSI) laser interferometer as well as a laboratory-based fiber-optic interferometer, both operating at 632 nm, were used to examine the displacements initially. For measurements made with the fiber-optic interferometer at a frequency of 1500 Hz, the displacement of the eardrum was approximately 68 nm. The response decreased linearly at a rate of 0.02 nm/Hz for frequencies greater than 1500 Hz. This paper reports on the experimental apparatus as well as the experimental results. Details on the design of the driving circuit and the interferometers also are presented.

Citation Download Citation

Joseph J. Suter, Jay C. Poret, and Doug E. Mattox "Laser interferometry for ear ossicular motion detection", Proc. SPIE 2131, Biomedical Fiber Optic Instrumentation, (28 July 1994); https://doi.org/10.1117/12.180751

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