【摘要】 为了实现微弱电流的智能化实时监测，基于法拉第效应，利用磁光晶体作为传感元件制作光纤电流传感器，具有维尔德常数大、灵敏度高、体积小、便于集成等优势。通过琼斯矩阵推导并分析了磁光晶体式光纤电流传感器的解调机理，搭建了基于磁光晶体偏振型光纤电流传感器的微弱电流测量系统；在偏振分析技术的基础上，提出双光路自平衡差分测量的方法消除两光路损耗系数的不相等，得到了实际应用中偏振型光纤电流传感器的解调表达式，使灵敏度达到最高为7.15×10^-4rad/mA,微电流测量分辨率优于0.5mArms。更多还原

【Abstract】 In order to achieve intelligent real-time monitoring of weak currents, the magneto-optical crystal is used as the sensing element of fiber optic current sensor based on the Faraday effect with the advantages of the large Verde constant, high sensitivity, small size, easy integration and so on. The demodulation mechanism of a polarization fiber optic current sensor using magneto optical crystal is derived and analyzed with the Jones matrix. A polarization fiber optic current sensing system for measuring weak current using magneto-optical crystal is built. And a dual optical self balancing measurement method using the basis of polarization analysis technology is proposed to eliminate the unequal loss coefficients of the two optical paths, and the demodulation expression for polarization fiber optic current sensor in practical applications is obtained with a maximum sensitivity of 7.15×10^-4rad/mA and a micro current measurement resolution better than 0.5mArms.更多还原