太阳光谱仪近红外光电探测系统设计  

Near-infrared photodectection system design for solar spectrum monitor

作　　者：李小溪 李乐[1] 黄煜[1] 杨小虎[1] 李占峰[1] 王彪[1] LI Xiaoxi;LI Yue;HUANG Yu;YANG Xiaohu;LI Zhanfeng;WANG Biao(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春130033

出　　处：《激光杂志》2024年第6期28-32,共5页Laser Journal

基　　金：吉林省重点科技研发项目资助(No.20210204110YY);吉林省科技发展计划项目资助(No.20220203016SF)。

摘　　要：针对星载太阳光谱仪近红外波段信号微弱、易受外部环境干扰等特点,设计了一种基于InGaAs红外单元探测器的锁相放大光电探测系统。分析了探测系统的噪声特性,发现抑制前置放大器的电路噪声对于降低系统噪声至关重要。优化了前置放大器PCB布局布线,采用保护环+保护层+过孔防护等设计,加强了输入光电流信号保护与屏蔽。利用卤钨灯模拟在轨情况下的太阳光谱强度,进行了地面试验。结果表明,探测电路对入射光强度的响应线性度可达99.95%;测试波段各波长信噪比较上一代太阳光谱仪均有显著提升。The near-infrared signal of the spaceborne solar spectrum monitor is usually weak and susceptible to external interference.To precisely detect the signal,a lock-in photodetection system based on InGaAs infrared detec-tor was designed.The noise characteristics of detection system were analyzed,and it is found that suppressing the pre-amplifier noise can significantly reduce the overall noise.The PCB layout of preamplifier was optimized.Guard rings,a guard plane and a via fence were placed in order to strengthen the guard and shielding of input photocurrent signal.A tungsten lamp was used to simulate the solar spectral intensity in orbit and ground tests were conducted.The results show that the response linearity of the photodetection circuit to the incident light intensity is 99.95%.The signal-to-noise ratio(SNR)of each wavelength within the band is significantly improved compared with the previous solar spec-trum monitor.

关 键 词：光电探测 微弱信号 In GaAs探测器 噪声 太阳光谱仪 

分 类 号：TN21[电子电信—物理电子学]