基于微分干涉仪的新型光纤声传感器

Novel Optical Fiber Sound Sensor Based on Differentiating Interferometer

基于微分干涉仪原理,建立了一套新型光纤声传感器系统。对该系统进行了理论分析,建立了系统的数学模型,推导并分析了干涉仪的输出信号,并以宽频信号做声源进行了实验研究。实验结果与理论分析相吻合,解决了目前双干涉仪线性范围窄的问题,简化了信号处理电路,可使用低相干光源,并且系统不受外界缓变因素的影响,对宽频声源定位的误差小于1%。

Based on the principle of the differentiating interferometer,a novel optical fiber sound sensor was presented. The theory was analyzed and the mathematical model was given. The expression of the output signal was obtained and analyzed. A wideband sound signal source was studied in experiments. The experimental results accord with the theory analysis,The interferometer not only resolves the narrow linear range of conventional bibeam interferometer, but also simplifies the signal processing circuitry. The light source with short coherent length can be used. The inaccuracy of the location of the wideband sound signal source is less than 1% and the result is out of the effect of slow circumstance variables.