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在单层保偏膜式光学玻璃电流传感系统中,费尔德(Verdet)常数、线性双折射和反射相移都是光波长的函数即存在色散特性,因此在采用宽带光源时系统中会产生波长积累效应。先给出了三者的色散特性公式,再对其波长积累效应进行理论分析和计算机仿真。研究结果表明,在所考虑的线性双折射和反射相移的量值范围内,波长积累效应对光学玻璃电流传感系统影响甚微,用单色光模型处理宽带系统的做法是合理的与可行的;光源谱宽变化对系统输出的影响小于0.025%,在考虑三者的联合影响时,Verdet常数色散的影响占主导地位,而且整体上系统输出随光源谱宽的增加而有微弱增加。
Verdet constant, linear birefringence, and reflection phase shift are all functions of the wavelength of light, ie, the dispersion characteristics present in a single-layer polarizer-type optical glass current sensor system. Therefore, when using a broadband light source, Produces wavelength accumulation effects. First, the dispersion characteristic formula of the three is given, then the theoretical analysis and computer simulation of the wavelength accumulation effect are given. The results show that the effect of wavelength accumulation on the optical glass current sensing system is negligible in the range of linear birefringence and reflection phase shift considered, and it is reasonable and feasible to process the broadband system with the monochromatic optical model The influence of the spectral width of the light source on the output of the system is less than 0.025%. The influence of the Verdet constant dispersion is dominant when considering the joint effect of the three, and the output of the system as a whole has a slight increase with the increase of the spectral width of the light source.