光谱学与光谱分析, 2011, 31 (10): 2829, 网络出版: 2011-11-09  

基于超窄线宽激光的一氧化碳多参数检测研究

Research on Carbon Monoxide Multi-Parameter Detection Based on Ultra-Narrow-Linewidth Laser
作者单位
山东大学控制科学与工程学院, 山东 济南250061
摘要
基于超窄线宽激光特性和激光器波长扫描技术, 通过对一氧化碳气体近红外吸收光谱的测量及分析, 设计了一氧化碳气体多参数实时在线检测系统。 系统采用超窄线宽可调谐半导体激光器作为光源, 利用气体直接吸收光谱测温法, 实现了一氧化碳气体温度实时检测。 根据所测温度值并结合气体浓度差分检测原理, 实现了一氧化碳气体温度和浓度同时测量。 利用超窄线宽激光器波长扫描技术还测得了不同温度下一氧化碳分子在6 354.179和6 383.09 cm-1附近的吸收谱线并进行了Voigt拟合和分析。 实验结果表明, 系统温度测量最大相对误差小于4%, 长时间稳定性实验, 温度最大相对波动小于3.5%; 系统浓度测量最大相对误差小于5%, 最小检测限为0.05%。 该气体多参数检测系统精确度高、 稳定性好, 可用于电力变压器故障气体状态实时在线监测。
Abstract
Through measuring and analyzing the infrared absorption spectrum of carbon monoxide, a kind of carbon monoxide multi-parameter detection system was designed based on the characteristics of ultra-narrow-linewidth laser and the spectrum scanning technology. A ultra-narrow-linewidth tunable semiconductor laser was utilized as light source and carbon monoxide temperature detection was achieved by measuring direct absorption spectra at different temperatures. According to temperature data and the principle of differential absorption concentration detection, carbon monoxide concentration and temperature were obtained simultaneously. With the spectrum scanning technology of ultra-narrow-linewidth laser, the spectra of carbon monoxide near the region of 6 354.179 and 6 383.09 cm-1 at different temperatures were measured, and also analyzed and fitted by Voigt profile. Finally the experiments indicate that the temperature measurement relative error is less than 4% and relative temperature fluctuation is less than 3.5%; the concentration measurement relative error is less than 5%, and the minimum detectable carbon monoxide is 0.05%. The multi-parameter detecting system has advantages of high accuracy and good stability, and can be used in power transformer fault gases on-line monitoring in real time.

陈霄, 隋青美, 苗飞, 贾磊, 王静, 姜明顺. 基于超窄线宽激光的一氧化碳多参数检测研究[J]. 光谱学与光谱分析, 2011, 31(10): 2829. CHEN Xiao, SUI Qing-mei, MIAO Fei, JIA Lei, WANG Jing, JIANG Ming-shun. Research on Carbon Monoxide Multi-Parameter Detection Based on Ultra-Narrow-Linewidth Laser[J]. Spectroscopy and Spectral Analysis, 2011, 31(10): 2829.

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