电调制非分光红外瓦斯传感系统设计

赵正杰; 刘东旭; 张记龙; 王志斌; 李晓; 田二明

光谱学与光谱分析, 2011, 31 (2): 570, 网络出版: 2011-03-24

电调制非分光红外瓦斯传感系统设计

Design of Non-Dispersed Infrared (NDIR) Methane Gas Sensor

论文大纲

赵正杰 ^1,*刘东旭 ¹张记龙 ^1,2王志斌 ^1,2李晓 ^1,2田二明 ^1,2

作者单位

¹ 中北大学山西省光电信息与仪器工程技术研究中心，山西太原030051

² 中北大学仪器科学与动态测试教育部重点实验室，山西太原030051

红外光谱吸收电调制非分光差分放大二项式拟合 Infrared absorption spectrum Non-dispersed Infrared Differential amplifier Binomial expression fitting

摘要

基于气体红外光谱吸收原理，设计了一款电调制非分光技术的红外瓦斯传感器系统。该系统采用单光路双波长技术，以红外LED光源IRL715、防尘防水的吸收气室和热释电探测器件LIM-262组成光学探头，利用有源滤波和差分放大电路实现信号调理，采用二项式拟合瓦斯浓度-电压关系曲线，实现了对瓦斯浓度的精确探测。实验表明，该传感器能够可靠检测5%范围的瓦斯气体，灵敏度达到0.5%，具有良好的一致性和适用性，初步具备了工业应用的条件。

Abstract

A Non-dispersed infrared (NDIR) methane gas sensors system based on infrared absorption spectrum theory was designed according to single light beam and double wavelengths technology. In the system, an infrared LED IRL715 serving as the light power, a absorptive gas cell with the function of dust-proof and damp-proof and a pyroelectric detector LIM-262 are composed of optical probe. Signal condition uses active filter circuit and differential amplifier, and binomial expression fits the relation curve between methane concentration and voltage, which realizes accurate detection of gas concentration. Experiment approved that the sensor system with good consistency and applicability can detect the range of 5% methane reliably and have 0.5% of the sensitivity, possessing the conditions for industrial applications initially.

参考文献

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赵正杰, 刘东旭, 张记龙, 王志斌, 李晓, 田二明. 电调制非分光红外瓦斯传感系统设计[J]. 光谱学与光谱分析, 2011, 31(2): 570. ZHAO Zheng-jie, LIU Dong-xu, ZHANG Ji-long, WANG Zhi-bin, LI Xiao, TIAN Er-ming. Design of Non-Dispersed Infrared (NDIR) Methane Gas Sensor[J]. Spectroscopy and Spectral Analysis, 2011, 31(2): 570.

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