光谱学与光谱分析 |
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Gas Pipeline Leak Detection Based on Tunable Diode Laser Absorption Spectroscopy |
ZHANG Qi-xing, WANG Jin-jun, LIU Bing-hai, CAI Ting-li, QIAO Li-feng, ZHANG Yong-ming* |
State Key Laboratory of Fire Science, University of Science & Technology of China, Hefei 230027, China |
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Abstract The principle of tunable diode laser absorption spectroscopy and harmonic detection technique was introduced. An experimental device was developed by point sampling through small multi-reflection gas cell. A specific line near 1 653.7 nm was targeted for methane measurement using a distributed feedback diode laser as tunable light source. The linearity between the intensity of second harmonic signal and the concentration of methane was determined. The background content of methane in air was measured. The results show that gas sensors using tunable diode lasers provide a high sensitivity and high selectivity method for city gas pipeline leak detection.
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Received: 2008-03-28
Accepted: 2008-06-29
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Corresponding Authors:
ZHANG Yong-ming
E-mail: zhangym@ustc.edu.cn
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