光弹调制器偏振光调制的检测系统设计  

Design of Detection System for Polarized Light Modulation of Photoelastic Modulators

作　　者：田磊 纪峰[1] 魏永清[1] Tian Lei;Ji Feng;Wei Yongqing(School of Instrument Science and Opto-electronics Engineering,Hefei University of Technology,Hefei Anhui,230009)

机构地区：[1]合肥工业大学仪器科学与光电工程学院,安徽合肥230009

出　　处：《电子测试》2020年第15期30-31,55,共3页Electronic Test

摘　　要：运动斯塔克效应诊断系统是获得内部磁约束等离子电流及其密度分布的重要诊断方法。通过测量原子分裂多普勒频移束发射光谱的偏振方向来获得超高温等离子体电流密度的剖面。光弹调制器将原子能级分裂的偏振信号转换为光强的变化。文章分析诊断系统的带宽和增益要求,选择合适的光电探测器对调制信号光进行检测,设计跨阻转换电路和电流放大电路,为后续的信号分析提取2倍频幅值信息提供精确的信号从而获得相关的电流信息。同时仿真电路的可行性,降低噪声减少干扰,满足提取的信号要求。The Motion Stark Effect diagnostic system is an important diagnostic method to obtain the internal magnetic confinement plasma current and its density distribution.The ultra-high temperature plasma current density profile is obtained by measuring the polarization direction of the atomic split Doppler shifted beam emission spectrum.The photoelastic modulator converts the polarized signal with split atomic levels into a change in light intensity.The article analyzes the bandwidth and gain requirements of the diagnostic system,selects a suitable photodetector to detect the modulated signal light,designs a transimpedance conversion circuit and a current amplification circuit,and provides accurate signals for the subsequent signal analysis to extract 2 times the frequency amplitude information.Obtain relevant current information.Simultaneously simulate the feasibility of the circuit,reduce noise and interference,and meet the requirements of the extracted signal.

关 键 词：运动斯塔克效应 微弱电流信号 光电探测系统 跨阻放大 

分 类 号：TL631.24[核科学技术—核技术及应用] TN761[电子电信—电路与系统]