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为了在某些应急情况下无源传输声音信号,采用基于光纤迈克尔逊干涉仪原理光纤声音传感的方法结合了收音弹性盘片和光纤粘接的工艺设计,使用3×3耦合器相位解调方法对传感信号进行相位解调,实现了一种新型光纤声音传感器系统。给出了干涉仪3路输出信号相位差的表达式,利用最小二乘法拟合求出干涉仪3路输出信号的平均相位差,取得了仿真与实际测试数据。经过测试,该系统可以准确有效地还原出设计带宽内的声音信号。结果表明,该光纤声音传感器系统适用于电磁恶劣等应急环境中,验证了该设计方案的可行性。
In order to transmit sound signals passively in some emergency situations, a fiber optic sound sensing method based on the principle of fiber Michelson interferometer was used in combination with a process design of a radio frequency elastic disk and an optical fiber bonding. The 3 × 3 coupler phase demodulation The method demodulates the phase of the sensing signal and realizes a new type of optical fiber acoustic sensor system. The expression of the phase difference of the three output signals of the interferometer is given. The average phase difference of the three output signals of the interferometer is obtained by the least squares fitting method. The simulation and the actual test data are obtained. After testing, the system can accurately and effectively restore the design of the bandwidth of the sound signal. The results show that the optical fiber acoustic sensor system is suitable for emergency situations such as electromagnetic harshness, and the feasibility of the design scheme is verified.