| 电调制非分光红外瓦斯传感系统设计 |
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| 作者姓名： | Zhao ZJ Liu DX Zhang JL Wang ZB Li X Tian EM |
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| 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. 中北大学山西省光电信息与仪器工程技术研究中心,山西,太原,030051;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 |
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| 基金项目： | 科技部国际科技合作重点项目,山西省国际合作项目 |
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| 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...
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| 关 键 词： | 红外光谱吸收 电调制非分光 差分放大 二项式拟合 |
Design of non-dispersed infrared (NDIR) methane gas sensor |
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| Zhao ZJ,Liu DX,Zhang JL,Wang ZB,Li X,Tian EM.Design of non-dispersed infrared (NDIR) methane gas sensor[J].Spectroscopy and Spectral Analysis,2011,31(2):570-573. |
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| Authors: | Zhao Zheng-Jie Liu Dong-Xu Zhang Ji-Long Wang Zhi-Bin Li Xiao Tian Er-Ming |
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| Institution: | Engineering Technology Research Center of Shanxi Province for Opto-Electronic Information and Instrument, North University of China, Taiyuan 030051, China. sbk@nuc.edu.cn |
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| 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. |
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