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提出了一种光纤干涉仪动态相移测量的新方法。该方法无需对光源进行调制,直接利用干涉信号的直流量和一次谐波分量,通过构造匹配函数的方法求解动态相移,实现了无源零差检测,而且具有信号解调简单、工作频带宽等特点。为了验证该方法的有效性,搭建了一个全保偏Mach-Zehnder光纤干涉仪系统,对压电陶瓷(PZT)产生的模拟动态相移进行求解。结果表明,求解得到的动态相移幅度与加载在PZT上的电压具有很好的线性关系,这与PZT的低频小信号特性一致。最后将该方法用于干涉型光纤水听器声压相位灵敏度频响的测量,实验结果与采用相位载波调制解调方法获得的结果基本吻合。
A new method of dynamic phase shift measurement of optical fiber interferometer is proposed. The method does not need to modulate the light source, directly utilizes the direct current and the first harmonic component of the interference signal, and constructs a matching function to solve the dynamic phase shift to realize the passive homodyne detection, and has the advantages of simple signal demodulation and wide working band Features. In order to verify the effectiveness of the method, a full-preserving bias Mach-Zehnder fiber interferometer system is built to simulate the dynamic phase shift generated by piezoelectric ceramics (PZT). The results show that the obtained dynamic phase shift amplitude has a good linear relationship with the voltage applied to PZT, which is consistent with the low-frequency small-signal characteristics of PZT. Finally, this method is used to measure the frequency response of acoustic pressure transducers of interference optical fiber hydrophone. The experimental results are in good agreement with those obtained by the phase-modulated signal demodulation method.