基于LabVIEW的TDLAS检测系统多参数影响研究  

On Multi-Parameter Influence of TDLAS Detection System Based on LabVIEW

作　　者：叶玮琳[1] 涂子涵 肖旭鹏 周波[1] 潘易宇 郑志丹[1] 吴涛[1] 吴福培[1] 徐严平[2] 郑传涛[3] WU Fupei;XU Yanping;ZHENG Chuantao(Key Laboratory of Intelligent Manufacturing Technology of Ministry of Education∥College of Engineering,Shantou University,Shantou 515063,Guangdong,China;Analysis and Testing Center,Shantou University,Shantou 515063,Guangdong,China;State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun 130012,Jilin,China)

机构地区：[1]汕头大学智能制造技术教育部重点实验室∥工学院,广东汕头515063 [2]汕头大学分析测试中心,广东汕头515063 [3]吉林大学电子科学与工程学院∥集成光电子学国家重点联合实验室吉林大学实验区,吉林长春130012

出　　处：《华南理工大学学报（自然科学版）》2021年第6期141-148,共8页Journal of South China University of Technology(Natural Science Edition)

基　　金：广东省科技计划项目(2017A020216011,180914204960289);集成光电子国家重点联合实验室开放课题(IOSKL2018KF09)。

摘　　要：在基于可调谐二极管激光吸收光谱技术(TDLAS)红外气体检测系统中,用来表征气体体积分数大小的二次谐波信号,易受到各类硬件参数的影响。基于比尔朗伯定律与HITRAN数据库,使用LabVIEW研究参数对二次谐波的谐波幅值、对称度、峰宽的影响,并进行了谐波优化仿真实验。结果表明:对于一般TDLAS检测系统,应优先选择合适的扫描幅度与滤波器阶数,使得谐波波形完整且不失真;然后尽可能增大谐波幅值与峰宽,得出最佳调制度;最后根据系统需求和自身硬件基础,选择合适的调制频率与扫描频率。In the infrared gas detection system based on tunable diode laser absorption spectroscopy(TDLAS),the second harmonic signal is used to calculate the gas percentage by volume.However,this signal is easily influenced by many parameters of the hardware.Based on Lambert Beer s law and HITRAN database,this paper used LabVIEW to study the influence of parameters on the amplitude,symmetry and peak width of the second harmonic,and carried out the harmonic optimization simulation experiment.The results show that,for the general TDLAS detection system,the appropriate scanning amplitude and filter order should be chosen firstly,so that the harmonic line would be complete and undistorted.Furthermore,the amplitude and peak width of the harmonic should be increased as much as possible to get the optimal modulation depth.Finally,the suitable modulation and scan frequency should be determined choose according to the system requirements and the hardware conditions.

关 键 词：二次谐波 红外检测技术 可调谐二极管激光吸收光谱技术 谐波幅值 谐波对称度 谐波峰宽 

分 类 号：TN29[电子电信—物理电子学]