摘要
光纤气体检测中广泛采用可调谐二极管激光吸收光谱(TDLAS)技术,其中光源常用分布反馈式半导体激光二极管。由于光源输出的中心波长与气体分子的吸收峰的重合度显著影响着检测结果的精确性,从Beer-Lambert定律等理论出发阐述了一种波长稳定方法的理论依据,然后提出了波长锁定系统的原理设计和软件设计,实验结果表明该系统在气体浓度检测中是合理的。
Tunable Diode Laser Absorption Spectroscopy（TD LAS） technology is widely applied in fiber optic gas detection,in which Distributed Feed-Back Laser Diode（DFB LD） is often used for its light source.Since coincidence degree between the center wavelength of LD＇s output spectrum and the absorption peak value of the gas molecule significantly affects the accuracy of detection,so this paper describes the theoretical basis for one way of stabilizing wavelength from BeerLambert Law,and then puts forward the design principle and software for the system of locking wavelength.Finally,experimental results show that the system for detecting gas concentration is reasonable.
出处
《工业安全与环保》
北大核心
2012年第10期66-69,共4页
Industrial Safety and Environmental Protection
关键词
TDLAS
二次谐波
温控
波长锁定
TD LAS second harmonic temperature control wavelength stabilization
