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Influence of membrane surface shape change on the performance characteristics of a fiber optic microphone

机译：膜表面形状变化对光纤麦克风性能特性的影响

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摘要

At a reflective intensity modulated fiber optic microphone (RIM-FOM), the acoustic signal makes a membrane vibrate and modulate the reflected intensity. In the existing models of the RIM-FOM, the offset of all points of the membrane, due to the vibration, is assumed to be equal. However, this assumption does not represent the actual vibration of the membrane, which follows a continuous surface shape change caused by the acoustic signal. We establish a revised theoretical model in which the influence of the actual membrane surface shape change on the reflective intensity modulation is considered. Experiments show that there is a discrepancy between the experimental optimum operating distance and the analytical result from the existing model, while our new model gives a better agreement with the experimental results. In particular, our analysis shows that, in using the existing model, the other microphone performance characteristics are misestimated, while our revised model can provide a closer solution.
机译：在反射强度调制的光纤麦克风（RIM-FOM）处，声信号使膜振动并调制反射强度。在RIM-FOM的现有模型中，由于振动，膜的所有点的偏移被假定为相等。然而，该假设并不代表膜的实际振动，该振动遵循由声信号引起的连续的表面形状变化。我们建立了一个修正的理论模型，其中考虑了实际膜表面形状变化对反射强度调制的影响。实验表明，实验最佳操作距离与现有模型的分析结果之间存在差异，而我们的新模型与实验结果具有更好的一致性。特别是，我们的分析表明，在使用现有模型时，其他麦克风的性能特征会被错误估计，而我们修订后的模型可以提供更接近的解决方案。

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