| Design of Optoelectric Detection Circuit for Difference Absorption Gas Sensor |
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| 作者姓名： | WANG Yan-ju WANG Yu-tian HOU Pei-guo WANG Zhong-dong |
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| 作者单位： | 1. Institute of Electric Engineering，Yanshan University，Qinhuangdao 066004，CHN; 2. Department of Electronics，Hebei Normal University，Shijiazhuang 050031，CHN; 3. Daqing Petroleum Institute at Qinhuangdao，Qinhuangdao 066004，CHN |
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| 基金项目： | Doctorate Foundation of Hebei Province，国家自然科学基金 |
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| 摘 要： | Since the gas infrared absorption spectrum linewidth is only several nanometers occupying the source intensity of several in a thousand, it is even less than the noise of light source. The signal of gas absorption is submerged in the noise, so it is impossible to measure the concentration of gas with spectrum absorption directly. According to the principle and parameters of difference absorption system of CH_ 4 gas, a detection circuit consisted of the lock-in amplifier is designed. The experiment results indicated that the detection circuit can satisfy the demand of the whole system, and the limit concentration is 150×10~ -6 .
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| 关 键 词： | 弱信号 电容滤波器 SNIR 放大器 传感器 |
| 文章编号： | 1007-0206（2006）01-0058-03 |
| 收稿时间： | 2005-10-17 |
| 修稿时间： | 2005-11-30 |
Design of Optoelectric Detection Circuit for Difference Absorption Gas Sensor |
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| WANG Yan-ju,WANG Yu-tian,HOU Pei-guo,WANG Zhong-dong.Design of Optoelectric Detection Circuit for Difference Absorption Gas Sensor[J].Semiconductor Photonics and Technology,2006,12(1):58-60,66. |
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| Authors: | WANG Yan-ju WANG Yu-tian HOU Pei-guo WANG Zhong-dong |
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| Abstract: | Since the gas infrared absorption spectrum linewidth is only several nanometers occupying the source intensity of several in a thousand, it is even less than the noise of light source. The signal of gas absorption is submerged in the noise, so it is impossible to measure the concentration of gas with spectrum absorption directly. According to the principle and parameters of difference absorption system of CH4 gas, a detection circuit consisted of the lock-in amplifier is designed. The experiment results indicated that the detection circuit can satisfy the demand of the whole system, and the limit concentration is 150×10-6. |
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| Keywords: | Lock-in amplifier Optoelectric detection Weak signal Rotating capacitor filter SNIR |
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