摘要
基于可调谐二极管激光吸收光谱学的大气痕量气体在线监测分析仪具有高灵敏、快速响应和高选择性的特点。分析了可调谐二极管激光吸收光谱(TDLAS)二次谐波信号的特征,以高浓度谐波信号作为标准,采用线性最小二乘拟合的方法对谐波信号进行数值拟合,高精度的反演出了痕量气体浓度值。并对标准信号和检测信号之间的相关系数和浓度反演规律进行了研究。以甲烷气体的测量信号和浓度反演为例,验证了算法。
Gas analyzers based on tunable diode-laser absorption spectroscopy （TDLAS） is provide with high sensitivity, fast response and highly specific in situ measurement of atmosl^heric trace gases. Characteristics of the second harmonic signal with TDLAS were analyzed. A method of the linear least-squares fitting used to deal with second harmonic signal of the measured trace gas based on the signal of high concentration was presented. The concentrations of trace gases were obtained with highly precision. The relationship between concentrations and the correlation coefficient was studied. Some measurements of methane were presented and discussed.
出处
《光学技术》
EI
CAS
CSCD
北大核心
2006年第5期717-719,722,共4页
Optical Technique
基金
国家自然科学基金资助项目(10274080)
