Design and Acoustic-Structural Coupling Analysis of Bionic Microphone

Abstract:

Sensorineural hearing loss is caused by the damage of hair cells in the inner ear, the transmission of acoustical signal is disrupted without hair cells. In order to solve the problems exist in electrical cochlea,the idea of develop bionic microphone is proposed using the special property of piezoelectric material. Primary design of the size of bionic microphone is given with the reference of advanced manufacturing methods. According to the scope of human hearing threshold, Acoustical-structural coupling property of the bionic microphone is researched when the microphone is immersed in lymph. And the results shows that the displacement is going up at first and then down with the increasing of the frequency within 1000Hz, the displacement is 0.28mm when the frequency is 500Hz,and goes down to 0.205mm when frequency is 1000Hz. When frequency is varied from 1000Hz to 10000Hz, the displacement is changing apparently. The displacement has been changed from 0.208mm when the frequency is 1000Hz to 2.6um when the frequency is 10000Hz. Frequency selectivity is not clearly presented from the point of the location of maximum displacement,and this phenomenon may caused by the fasten mode of designed microphone and high Young modulus of silicon.

• Periodical: Advanced Materials Research (Volumes 785-786)
• Pages: 1299-1304
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.785-786.1299
• Online since: September 2013
• Authors: Wei Yang*, Jian Xi Qiu
• Keywords: Bionic Microphone, Coupling Analysis, Displacement Response

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