T0501-5-5 人工内耳用MEMS音響センサの振動特性とそのモデル化([T0501-5]マイクロ・ナノスケールの熱流体現象(5))

概要

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In this paper, we report vibration dynamics of the bionic auditory membrane (BAM) for a novel implantable artificial cochlea. The BAM is a long-trapezoidal and flexible membrane made of a piezoelectric material. The BAM vibrates by applying acoustic waves, resulting in the generation of electrical signals which can be used for stimulating auditory neurons. To clarify the applicability of the BAM for transient acoustic waves, the vibration dynamics were investigated based on the measurement of the reverberation induced by pulsed sine waves. The echo signals due to the reverberation were analyzed by the Fourier spectra that provided the information of the frequency selectivity. Furthermore, a theoretical model was developed to describe the wave propagation on the BAM. The results clarified the detailed processes of the wave propagation and those effects on the frequency selectivity.
2010-09-04