复合式VCSEL型CO和CH_(4)激光气体检测系统设计  

Design of a composite VCSEL CO and CH_(4) laser gas detection system

作　　者：王彪[1] 程林祥 薛金波 张瑞 俞泳波 WANG Biao;CHENG Linxiang;XUE Jinbo;ZHANG Rui;YU Yongbo(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 100049,China;University of Science and Technology of China,Hefei 230026,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 [2]中国科学院大学,北京100049 [3]中国科学技术大学,合肥230026

出　　处：《激光杂志》2023年第7期27-31,共5页Laser Journal

基　　金：吉林省科技发展计划重点科技研发项目(No.20220203016SF)。

摘　　要：一氧化碳(CO)和甲烷(CH_(4))是大气中主要的污染性气体,而且二者都属于易燃易爆气体。一氧化碳和甲烷浓度检测在人民生产生活各个领域都具有重要意义。因此,本文开展了VCSEL型CO和CH_(4)双组分TDLAS气体检测系统的研究。针对双组分气体检测,提出了一种双波长分时扫描式自主校正检测技术,消除了光信号的交叉干扰,实现了单信号环路对双组分气体的高精度检测;针对VCSEL激光器工作温度稳定性要求高和阈值电流低等工作特性,设计了高精度温控电路和精密电流驱动电路;针对双组分气体光电探测器信号幅值不同的特点,设计了偏压和增益数控可调的光信号采集处理电路。本系统进行了整体性能测试,稳定性较好。Carbon monoxide(CO)and methane(CH_(4))are the main polluting gases in the atmosphere,and both are flammable and explosive gases.The detection of carbon monoxide and methane concentrations is of great significance in various fields of people's production and life.Therefore,this article conducted research on the VCSEL type CO and CH_(4) dual component TDLAS gas detection system.A dual wavelength time-sharing scanning autonomous correction detection technology is proposed for dual component gas detection,which eliminates cross interference of optical signals and achieves high-precision detection of dual component gases in a single signal loop;A high-precision temperature control circuit and a precision current drive circuit were designed to address the high temperature stability requirements and low threshold current characteristics of VCSEL lasers;A light signal acquisition and processing circuit with CNC adjustable bias and gain was designed to address the different signal amplitudes of dual component gas photodetectors.

关 键 词：CO CH_(4) 复合式 TMS320C6746 

分 类 号：TN271.5[电子电信—物理电子学]