【2018年最新整理】光源谱宽对光学电流传感器输出影响研究.doc

光源谱宽对光学电流传感器输出影响的研究 摘要 光学电流传感器从原理上可分为两类：无源型的利用法拉第效应原理，有源型的利用光纤传导技术和CT技术。在以往对光学电流传感器的研究与设计中，大多数研究假定光源输出单色光，很少讨论波长积累效应和宽带光源对系统的影响。 本文无源型光学电流传感器研究了Verdet常数引起的波长积累效应，并求解了SF10型玻璃材料的色散特性，且对只考虑Verdet常数的波长积累效应下，影响光学电流传感器系统输出的量进行计算机仿真研究结果表明，Verdet常数的波长积累效应对光学电流传感器系统影响非常小，因此在理论研究中若不考虑其他光学参量的波长积累效应，用单色光模型处理宽带系统的做法是合理的与可行的。 有源型光学电流传感器研究了由于光源存在谱线宽度对系统输出的影响，论文理论推导和仿真了有源型光学电流传感器由于光纤色散引起的宽带光源对脉冲展宽的影响。研究结果表明：当光源光谱宽度在40nm到60nm之间变化时，脉冲展宽很小，信号衰减量对信号接收质量的影响较小，且脉冲展宽随光源谱宽的增加有微弱的增加，并通过实验进行了定性验证。因此在有源型光学电流传感器的实际研究中采用单色模型是合理的和可行的。 关键词 光学电流传感器；光源谱宽；法拉第效应；Verdet常量；光纤色散Effect of the spectral width upon the output of the optical current sensor Abstract Optical current sensor(OCS) can be divided into two categories in principle. One is OCT with Faraday effect, the other is active OCS(AOCS) with optical fiber transmission technique and current transformer(CT) technique. This article studies the Verdet constant caused by the wavelength accumulation effect from OCS and solves the SF-10 glass dispersion properties of materials. In the condition that only consider the wavelength accumulation effect caused by Verdet constant, we conduct computer simulation to the parameters which influence output of the optical current sensor system. The results show that: the influence caused by wavelength accumulation effect of Verdet constant on the optical current sensor system is very small. So, it is reasonable and feasible that using monochromatic model handles broadband system. The article also studies the effect of output system by the spectral width from AOCS. It deduces and simulates of AOCS of broadband light source due to fiber dispersion on pulse broadening effect. The results show that when the spectra width of light sources varies between 40-60 nm, pulse broadening is small. The effect of reception quality is barely much by signal attenuation. Finally, our experimental results verify above conclusions. Keywords optical current sensor; spectrum width of optical source; Faraday effect; Verdet constan