摘要
作为新的痕量气体监测分析方法,可调谐二极管激光吸收光谱学的二次谐波技术在大气化学研究和污染气体监测得到实际应用。本文以CO气体的中心波长为λ0=1579.74nm的P(5)振-转吸收谱线为目标,建立高斯线型的二次谐波信号数值模型,仿真得到二次谐波曲线,研究了二次谐波信号特性与调制度m的关系。并对仿真结果与洛仑兹吸收线型二次谐波信号特性进行了分析和比较。
The second-harmonic technology of tunable diode laser absorption spectroscopy has been ap- plied in the fields of the atmospheric chemistry and the monitoring pollutant gases as the new method of measuring the trace gases. In this paper, the investigated object is the P（5 ） vibration-rotation absorption line of CO gas with λ0 = 1 579.74 nm. And the mathematics symbol of its second-harmonic curves for Gauss line shape has been founded and simulated. The relationship between the second-harmonic signal and the modulation amplitude m is also be presented. The characteristics of second-harmonic signal in Gauss line shape based on the simulated results is analyzed in comparison with the one in Lorentzian line shape.
出处
《南京邮电大学学报（自然科学版）》
2009年第5期46-49,共4页
Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition
基金
南京邮电大学校科研基金(NY207026)资助项目
关键词
二次谐波
调制度
数值模拟
second-harmonic
modulation amplitude
numerical simulation
