线性双折射对光学玻璃电流传感器输出特性影响的理论分析

Theoretical Analysis of the Effects of the Linear Birefringence Upon the Performance of a Bulk Glass Optical Current Sensor

对线性双折射及入射起偏角对光学玻璃电流传感器输出特性的影响进行了理论推导与分析 ,给出了光学玻璃电流传感器在非理想状态下线性双折射对输出电压的调制函数的数学表达式 ,并给出了入射起偏角对系统影响的数学表达式及其对系统有无影响的条件 结果表明 ,线性双折射会以Sa(δ)函数 (抽样函数 )的形式调制理想光学玻璃电流传感器输出信号的尺度因子 ,同时以-sin2 (δ/ 2 )为影响因子决定入射起偏角对系统影响的大小 ;当入射起偏角取某些特殊值时其对系统的影响为零 该工作结果对于光学玻璃电流传感器的研究。

The effects of the linear birefringence and incident polarizing angle upon the performance of a bulk glass optical current sensor are derived and analyzed, a modulation formula to describe the influences of the linear birefringence to the output signal of the sensor is given.The effect of the incident polarizing angle upon the performance of the system and the condition to determine if or not it can exert the influence are also given.The results show that the linear birefringence will modulate the scale factor of the system with a Sa(δ) function, it can also affect the extent of the influence of the incident polarizing angle, taking -sin 2 (δ/2) as the influence factor, at the same time. When the incident polarizing angle has some special values such as 0,45, or 90 degree, the effect to the system will be zero. These results might provide some useful reference to the researchers and designers of bulk glass optical current sensors.