Homodyne interferometer for basilar membrane measurements |
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| Authors: | S M Khanna |
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| Affiliation: | 1. Jiangsu Key Laboratory of Engineering Mechanics, School of Civil Engineering, Southeast University, Nanjing, JS, China;2. School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo, SD, China;1. Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin Chengjian University, Tianjin 300384, China;2. School of Civil Engineering, Tianjin Chengjian University, Tianjin 300384, China;3. China Railway Construction Group Co., Ltd., Beijing 100040, China;1. NSLS-II, Brookhaven National Laboratory, Upton 11973, NY, USA;2. Rose-Hulman Institute of Technology, 5500 Wabash Avenue, Terre Haute 47803, IN, USA |
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| Abstract: | Techniques available for measuring the mechanical response of the inner ear are compared. These include capacitive probe, Mössbauer and interferometric methods. The theory of a homodyne interferometer utilized for inner ear measurements is given. Experimental apparatus built to test the interferometer performance is described. Experimental results show that the measuring system can detect vibrations as low as 3 × 10−12 cm. Its frequency response is flat within 1 dB from 0.1 to 40 kHz. It has a linear dynamic range of over 90 dB. Immunity of the interferometer to various disturbances is demonstrated. |
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