光纤声传感器特性的实验研究

光纤传声器是一种由探头和光纤组合成的Y型声传感器,这种传感器在完成声光转换的同时对声频信号进行了滤波处理,可用在强电磁干扰等一些特殊的环境中.本文对研制的实验型光纤声传感器系统的响应特性进行了测试.当固定光源为50 mA,输入信号200 mV的正弦波,频率为1 kHz时,探测到的信号波形与输入信号波形完全吻合;然后,保持输入信号的电压幅值不变,频率从1 kHz开始分别测量传声器的高频响应和低频响应,发现传声器响应特性比较好,但低频响应特性不如高频响应特性理想,分析原因并给出设计更好的实验型光纤传声器的解决办法.

The Experimental Research on Characteristics of Fiber-Optic Acoustic Sensor

The designed fiber-optic acoustic sensor is a new type of sensor which is composed of the structure of Y type reflective multimode fiber sensing probe and optic fiber. When the acousto-optic conversion is carrying out, at the same time the parallel filtering for the acoustic signal is carried out by the sensor. It can be used in the surroundings with strong electromagnetic interference. We design the system in experiment and have a test. By testing and analyzing we find that the output waveform is in accord with that of input at 1 kHz frequency. The responsibility is as scheduled, the acoustic sensor is good at low and high signal. But the base response is not equal to the high frequency response. We give the solving measure on the basic of analyzing for design better fiber-optic acoustic sensor.