干涉型光纤传感器因其灵敏度很高而成为光纤传感器研究的一个重要组成部分。将其实用化需要解决因偏振态变化和相位随机漂移而导致的信号衰落问题,使输出信号稳定。介绍了光纤电流互感器的基本工作原理。通过理论分析,计算了波片对其温度特性的影响。为使光纤电流互感器满足全温下的使用要求,提出了检测电路的改进方案,并给出了理论依据。 Interferometric fiber optic sensors have become an important part of fiber optic sensor research due to their high sensitivity. To put it into practical use, it is necessary to solve the problem of signal fading caused by the change of polarization state and random phase shift, so that the output signal is stable. The basic principle of optical fiber current transformer is introduced. Through theoretical analysis, the influence of wave plate on its temperature characteristics is calculated. In order to make the optical fiber current transformer meet the requirements of the whole temperature, an improved scheme of the detection circuit is proposed and the theoretical basis is given.