光谱学与光谱分析 |
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Tunable Diode Laser Absorption Spectroscopy System for Trace Ethylene Detection |
PAN Wei-dong1, ZHANG Jia-wei2, DAI Jing-min1, SONG Kai1 |
1. School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China 2. College of Electromechanical Engineering, Northeast Forestry University, Harbin 150040, China |
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Abstract Tunable diode laser absorption spectroscopy (TDLAS) was characterized by ultra-narrow line width laser and wavelength modulation, which makes it possible to scan a single absorption line. TDLAS has an advantage in trace gas analysis for its high resolution, high sensitivity and quick response. The 1 626.8 nm absorption line of ethylene was selected for detecting by analyzing its absorption line characteristic. The TDLAS system was developed with a white type multi-pass cell, combined with wavelength modulation and harmonic detection. Ethylene concentration ranges from 20 to 1 200 ppmv were tested using this system. The estimated detection limit of the system is 10 ppmv.
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Received: 2012-03-30
Accepted: 2012-06-25
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Corresponding Authors:
PAN Wei-dong
E-mail: whispe@163.com
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