光学学报, 2019, 39 (1): 0106001, 网络出版: 2019-05-10
基于相位解调的双光束薄膜干涉型光纤传声器 下载: 911次
Double-Beam Thin-Film Interferometric Fiber Microphone Based on Phase Demodulation
光通信 光纤传感器 声传感 双光束薄膜干涉 相位解调 optical communication fiber sensor acoustic sensing double-beam thin-film interference phase demodulation
摘要
针对基于相位解调的双光束薄膜干涉型光纤传声器的特性展开了研究,仿真分析了三路信号的直流分项、交流分项以及相位差对双光束薄膜干涉型光纤传声器输出性能的影响。采用对比法,并通过实验研究了基于相位解调的双光束薄膜干涉型光纤传声器的输出特性,实现了灵敏度为193 mV/Pa@1 kHz、频率响应为200 Hz~4 kHz@±3 dB的声信号测量。本研究能够很好地应用于声探测、语音识别等领域。
Abstract
The performances of a double-beam thin-film interferometric fiber (DBTFIF) microphone based on phase demodulation is studied. The effects of the direct current (DC) subentry, alternating current (AC) subentry and phase difference of three interference signals on the output performances of this DBTFIF microphone are analyzed by simulation. Through the comparison method, the output performances of this DBTFIF microphone based on phase demodulation are studied experimentally as well. The experimental results show that the measurement of acoustic signals with a sensitivity of about 193 mV/Pa at 1 kHz and the frequency response ranging from 200 Hz to 4 kHz with a fluctuation of about ±3 dB can both be achieved. This research can be well used in the fields of acoustic detection, voice recognition, and so on.
周瑜, 刘超, 王坤博, 魏晓村. 基于相位解调的双光束薄膜干涉型光纤传声器[J]. 光学学报, 2019, 39(1): 0106001. Yu Zhou, Chao Liu, Kunbo Wang, Xiaocun Wei. Double-Beam Thin-Film Interferometric Fiber Microphone Based on Phase Demodulation[J]. Acta Optica Sinica, 2019, 39(1): 0106001.