高精密红外探硫传感器的研究与设计  

Research and Design of High Precision Infrared Sulfur Detection Sensor System

作　　者：魏丽君[1] 粟慧龙[2] WEI Li-jun;SU Hui-long(Training Center,Hunan Railway Professional Technology College,Zhuzhou 412001,China;Academic Affairs Office,Hunan Railway Professional Technology College,Zhuzhou 412001,China)

机构地区：[1]湖南铁道职业技术学院实训中心,株洲412001 [2]湖南铁道职业技术学院教务处,株洲412001

出　　处：《自动化与仪表》2023年第2期88-92,共5页Automation & Instrumentation

基　　金：湖南省自然科学基金项目(2022JJ60008)。

摘　　要：根据气体的红外吸收特性,SO2的特征吸收峰所在的波长与人体红外波长范围正好重叠。因此,红外硫探测器成为了敏感元件,国内生产的红外硫探测系统测量精度不够,进口红外硫探测系统很大程度对国内进行了技术封锁。基于此,该文采用非分光红外技术,针对当前高精密红外低硫传感器最重要信噪比影响源进行了研究,优化了光源驱动、红外气室恒温控制、信号采样与微弱信号处理电路设计等,完成了一套低硫探测装置的设计,经过测试,信号的噪声波动从原来的140 uV减小到50 uV左右,检出限达到0.01 ppm,实现了低硫检测领域的技术创新,该项目成果已经成功实现量产。According to the infrared absorption characteristics of the gas,the wavelength of the characteristic absorption peak of SO2exactly overlaps the infrared wavelength range of the human body. Therefore,the infrared sulfur detector has become a sensitive element. The measurement accuracy of the domestic infrared sulfur detection system is not enough,and the imported infrared sulfur detection system has blocked the domestic technology to a great extent.Based on this,this paper uses non spectral infrared technology to study the most important signal-to-noise ratio influence source of the current high-precision infrared low sulfur sensor,optimizes the light source drive,infrared chamber thermostatic control,signal sampling and weak signal processing circuit design,and completes the design of a set of low sulfur detection device. After testing,the noise fluctuation of the signal is reduced from the original 140 uV to about 50 uV. The detection limit reached 0.01 ppm,which realized the technological innovation in the field of low sulfur detection,and the results of the project have successfully achieved mass production.

关 键 词：非分光红外技术 红外吸收谱 朗伯-比尔定律 微弱信号处理 探硫传感器 

分 类 号：TP334.3[自动化与计算机技术—计算机系统结构]