混合气体的光电检测系统  

Photoelectric Detection System for Mixed Gas

作　　者：王丽静 张建军[1] 王丽君[2] WANG Li-jing;ZHANG Jian-jun;WANG Li-jun(Xi'an Shiyou University,Xi'an 710300,China;Shaanxi Institute of International Trade&Commerce,Xianyang 712046,China)

机构地区：[1]西安石油大学,陕西西安710300 [2]陕西国际商贸学院,陕西咸阳712046

出　　处：《仪表技术与传感器》2021年第1期73-76,共4页Instrument Technique and Sensor

基　　金：陕西省教育厅专项科学研究(18JK1041);陕西国际商贸学院物联网与智能技术科技创新团队建设项目(SSY18TD05)。

摘　　要：利用光吸收原理设计气体检测系统。为提高系统的灵敏度和准确度,设计用于提供光源的4 mA激励源电路、高响应的对比解调电路和三级放大加数字闭环的调理电路等硬件,开发数字滤波器、驱动程序和混合气体检测分析的软件系统,利用70 ppm的氨气与40 ppm的硫化氢混合气体进行检测实验。实验数据显示电压分辨率为10 mV,相对标准偏差小于5%。结果表明光电检测系统可以识别混合气体浓度。The gas detection system was designed using the principle of light absorption.In order to improve the sensitivity and accuracy of the system,a 4 mA excitation source circuit designed to provide the light source,a high-response contrast alignment circuit and a three-stage amplification plus digital closed-loop conditioning circuit were developed.Digital filters,drivers,and mixed gas detection were developed.The analysis software system used 70 ppm ammonia and 40 ppm hydrogen sulfide mixed gas to carry out detection experiments.Experimental data shows that the voltage resolution is 10 mV and the relative standard deviation is less than 5%.The detection system can identify the mixed gas concentration.

关 键 词：气体检测 光电检测 嵌入式系统 信号分析 

分 类 号：TN29[电子电信—物理电子学]