光谱学与光谱分析, 2012, 32 (10): 2875, 网络出版: 2012-11-22
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
Tunable Diode Laser Absorption Spectroscopy System for Trace Ethylene Detection
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。
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.
潘卫东, 张佳薇, 戴景民, 宋凯. 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. PAN Wei-dong, ZHANG Jia-wei, DAI Jing-min, SONG Kai. Tunable Diode Laser Absorption Spectroscopy System for Trace Ethylene Detection[J]. Spectroscopy and Spectral Analysis, 2012, 32(10): 2875.