Verdet常数色散对光学电流传感器灵敏度影响的理论研究

为了加深对灵敏度问题的理解,这里以琼斯矩阵为数学工具,利用理论分析和计算机仿真的方法研究了重火石玻璃的Verdet常数色散特性及其对块状玻璃光学电流传感器灵敏度的影响.在块状玻璃光学电流传感器系统中,光源的驱动电流与环境温度改变,都会造成光源峰值波长移动.传感头光学材料的Verdet常数的色散特性会使光学电流传感器的灵敏度随光源波长的变化而改变.研究结果表明,Verdet常数的色散特性会对输出曲线的尺度因子产生明显的影响.因此,对光源采取恒温恒流控制或者对结果进行校正是必要的.该研究结果可为光学电流传感器的研究设计人员提供有用的参考.

Theoretical study of the effect of the Verdet constant dispersion upon the sensitivity of an optical current sensor

The dispersion properties of the Verdet constant of the ZF-7 optical glass and its effect upon the (sensitivity) of a bulk-glass optical current sensor are theoretically analyzed using the Jones' matrix as a mathematical tool and computer simulation. In a bulk-glass optical current sensing system, when the fluctuations of the driving current or the ambient temperature of the optical source happens, the peak wavelength of the source will change. This will (result) in the fluctuation of the sensitivity of the system because of the existing of the dispersion of the Verdet constant. The investigation results show that the dispersion will obviously affect the scale factor of the system. Therefore, it is necessary to stabilize the driving current and the ambient temperature of the optical source or correct the outcome. These results might be useful for researchers and designers working in the optical current sensing techniques area.