反射相移色散对OCS灵敏度影响的理论研究

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单层保偏反射膜反射相移的色散特性及其对光学电流传感器灵敏度的影响.在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.由于反射膜上产生的反射相移的色散特性,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,反射相移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,光源的恒温控制与光源驱动电流的恒流控制是必要的. 本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 Reflection-induced Retardance Dispersion upon the Sensitivity of an Optical Current Sensor

The dispersion properties of the reflection-induced retardance of the polarization-preserving reflecting medium layer and its effect upon the sensitivity of an optical current sensor are theoretically analyzed taking the Jones′ Matrix as a mathematical tool and simulated with a computer. In an 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 reflection-induced retardance. 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 by some technical means. These results might be useful for the researchers and designers working in the optical current sensing techniques area.