可调谐半导体激光吸收光谱技术检测痕量乙烯气体的系统研制

doi:10.3964/j.issn.1000-0593(2012)10-2875-04

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摘要：可调谐半导体激光吸收光谱技术(TDLAS)利用激光器的窄线宽和波长调谐特性，使其扫描被测气体的单个吸收峰，实现痕量气体的高分辨率、高灵敏度快速检测。通过分析近红外波段的乙烯吸收谱线特性，选取1 626.8 nm附近的吸收峰作为检测谱线，研制了基于white池结构的TDLAS检测系统，结合波长调制和二次谐波检测，对体积分数为20～1 200 ppmv的乙烯气体进行了测量，推算该系统的检测下限约为10 ppmv。

关键词：TDLAS;乙烯;痕量气体;波长调制

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.

Key words：TDLAS;Ethylene;Trace gas;Wavelength modulation

收稿日期: 2012-03-30 修订日期: 2012-06-25

中图分类号:

TH744.4

通讯作者: 潘卫东 E-mail: whispe@163.com

引用本文:

潘卫东¹，张佳薇²，戴景民¹，宋凯¹ . 可调谐半导体激光吸收光谱技术检测痕量乙烯气体的系统研制[J]. 光谱学与光谱分析, 2012, 32(10): 2875-2878.
PAN Wei-dong¹, ZHANG Jia-wei², DAI Jing-min¹, SONG Kai¹. Tunable Diode Laser Absorption Spectroscopy System for Trace Ethylene Detection. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(10): 2875-2878.

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