基于LabVIEW的气体高分辨率光谱探测系统  

A High Sensitive Spectral Detection System of Gaseous Measurement Based on LabVIEW

作　　者：龙精明[1] 周卫东[1] 吴志伟[1] 

机构地区：[1]浙江师范大学信息光学研究所,浙江金华321004

出　　处：《中国激光》2013年第1期240-243,共4页Chinese Journal of Lasers

基　　金：国家自然科学基金(61178034);浙江省自然科学基金(Y1100268);浙江省高校重大科技攻关(ZD2009006);浙江师范大学创新团队资助课题

摘　　要：搭建了一套基于LabVIEW的实时、在线气体高分辨率光谱探测系统,采用离轴入射腔增强吸收光谱技术,将外腔式二极管激光器(ECDL)作为激光光源,实现了粗细两种扫描方式的光谱测量,获得了CO2分子在6358.65cm-1处的弱吸收谱峰、吸收光谱强度、线宽与气体浓度的关系,采用该吸收峰使整个系统的最小探测灵敏度达1.1×10-6 cm-1。在波数为6450～6530cm-1范围内,所获得的CO2分子振动转动光谱与模拟结果基本一致。实验结果表明该系统不仅可行,而且具有较高的探测灵敏度和光谱精度,能满足气体不同光谱的探测需求。A real-time, on-line gaseous detection system with high-resolution spectrum is built based on LabVIEW. It employs off-axis cavity enhanced absorption spectroscopy technology, and uses an external cavity diode laser （ECDL） as a laser light source. Two kinds of scan mode, one in roughness, the other in fineness for spectral measurement are achieved. A weak absorption spectrum of CO2 molecule as well as the relationship among the spectral intensity, line width and gaseous concentration is obtained at wave number of 6358.65 cm^-1. The minimum detection sensitivity is 1.1× 10^-6 cm^-1 for the entire system when using the 6358.65 cm^-1spectral line. Vibration- rotation spectra of CO2 molecule from experiment is basically consistent with the simulation results in the wave number range of 6450--6530 cm^-1. Experimental results indicate that this system is not only feasibility but also has high detection sensitivity and spectral resolution, and meets the different spectral detection requirements of gas.

关 键 词：测量 腔增强吸收光谱 外腔二极管激光器 离轴 LABVIEW CO2 

分 类 号：O433.5[机械工程—光学工程]