全植入式助听器微型后向反射器的光学振动检测比较研究

Z. Djinovic, M. Tomić, R. Pavelka, G. Sprinzl
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引用次数: 0

摘要

采用光学干涉法检测中耳听骨振动,获得全植入式助听器(TIHA)所需的声信号。为了提高反射率,我们在砧板上安装了一个轻便的后向反射器。本文采用改进的光纤迈克尔逊干涉仪,基于单模3×3耦合器和高相干VCSEL光源,研究了三种不同类型的后向反射器。目标的正弦振动是由PZT产生的,在声波频率范围内,振幅在几皮米到几百纳米之间。当探测光束到后向反射器的位置发生变化时,捕获并解调正交信号。从最大信噪比和最小可探测振幅两个方面对后向反射器和探测光束准直技术进行了评价。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A comparative study on miniature retroreflectors for totally implantable hearing aids using an optical detection of the incus vibration
Optical interferometric detection of the middle ear ossicle vibration is used to get an acoustical signal needed for a totally implantable hearing aid (TIHA). In order to improve the reflectivity, we have attached a lightweight piece of retroreflector to the incus. Three different kinds of retroreflectors were investigated here, using a modified fiber-optic Michelson interferometer, based on a single mode 3×3 coupler and a high-coherence VCSEL light source. The sinusoidal vibration of the target was produced by a PZT, in the acoustic frequency range with amplitudes in the range of several picometers to hundreds of nanometer. The quadrature signals were captured and demodulated while the position of the probing beam to the retroreflector were changing. The evaluation of retroreflectors and probe beam collimating techniques was made in respect of the maximum signal-to-noise ratio and the minimum detectable amplitude of vibrations.
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