一种提高光纤脉冲磁场传感器稳定性的新方法

The analysis of the stability of the fiber optic pulse magnetic field sensor based on the Faraday effect

采用琼斯矩阵法推导了基于法拉第磁光效应的光纤脉冲磁场传感器的信号输出表达式,分析了磁光晶体中线性双折射和圆双折射对测量准确度的影响,提出了消除线性双折射对测量影响的新方法,并讨论了减小温度对圆双折射影响的方法.实验表明,这种方法在-20℃～60℃的温度范围内测量误差小于0 15%.

The signal output expression for the fiber optic pulse magnetic field sensor based on the Faraday effect is deduced by the Jones matrix. The influence of linear birefringence on measurement accuracy is analyzed. The theoretical description is used to develop practically applicable methods of eliminating the temperature and vibration drift caused by the linear birefringence in the Faraday material. The temperature drift caused by the circular birefringence in the Faraday material is avoided. Accuracies of up to 0.15% error over a temperature range from (-20℃～)60℃ have been achieved.