摘要
可调谐半导体激光吸收光谱(TDLAS)技术是一种具有高灵敏、高分辨、快速响应等特点的气体检测技术,利用半导体激光器可调谐、窄线宽特性,通过检测气体的一条吸收线实现气体浓度的准确检测.阐述了基于波长调制TDLAS技术的氧气检测方法,选择DFB激光器作为光源,通过检测760 nm附近氧气分子的一条吸收线实现了氧气在线监测,主要分析了谐波信号的特性及系统的线性响应.
Tunable diode laser absorption spectroscopy(TDLAS) is a high sensitivity,high selectivity and fast time response trace gas detection technique.With the features of tunability and narrow linewidth of distributed feedback(DFB) diode laser and by precisely tuning the laser output wavelength to a single isolated absorption line of the gas,TDLAS technique can be utilized to accurately deduce the gas concentration with very high sensitivity.The detection of O_2 based on the principle of wavelength modulation spectroscopy(WMS),used a tunable distributed-feedback diode laser as optical source,and selected a line of O_2 near 760 nm for online gas detection.The characteristic of the second harmonic signal,and the system linear response are mainly analyzed.
出处
《大气与环境光学学报》
CAS
2009年第3期217-222,共6页
Journal of Atmospheric and Environmental Optics
基金
国家863计划(2007AA06Z420)
关键词
可调谐二极管激光吸收光谱
二次谐波信号
线性响应
tunable diode laser absorption spectroscopy
second harmonic signal
linear response
