基于可调谐激光二极管吸收光谱的乙炔在线检测系统  

Online Detection System on Acetylene with Tunable Diode Laser Absorption Spectroscopy Method

作　　者：何启欣 刘慧芳[1] 李彬[1] 潘教青[1] 王利军[2] 郑传涛[1] 王一丁[1] HE Qi-xin LIU Hui-fang LI Bin PAN Jiao-qing WANG Li-jun ZHENG Chuan-tao WANG Yi-ding(State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China)

机构地区：[1]集成光电子学国家重点联合实验室吉林大学实验区,吉林大学电子科学与工程学院,吉林长春130012 [2]材料科学重点实验室,中国科学院半导体所,北京100083

出　　处：《光谱学与光谱分析》2016年第11期3501-3505,共5页Spectroscopy and Spectral Analysis

基　　金：国家科技支撑计划项目(2014BAD08B03,2013BAK06B04);国家自然科学基金项目(61307124,61077074);吉林省科技发展计划项目(20120707)资助

摘　　要：基于可调谐半导体激光吸收光谱技术,研制了一种近红外乙炔气体检测系统。通过分析近红外波段乙炔分子的吸收谱线特性,选择了1.534μm附近乙炔分子的吸收峰作为吸收谱线。该系统主要由分布反馈激光器、激光器驱动器、单光程对射式气室、光电探测模块及数字式锁相放大器构成。为了测试该检测系统的性能,配备了乙炔气体样品并开展了气体检测实验。实验结果显示,该系统的最小检测下限为0.02%;在体积分数为0.02%~1%范围内,二次谐波幅值与乙炔气体浓度呈现出良好的线性关系。通过长达20h的稳定性实验测试了检测系统稳定性。鉴于近红外波段石英光纤传输损耗很小,可以将气室及光路部分与电路部分分离,从而可以进行远程气体检测,这是基于量子级联激光器、热光源的乙炔检测系统难以实现的。该系统采用了自主研制的分布反馈激光器驱动器和锁相放大器,结构简单,性价比高,便与集成,在工业现场乙炔浓度检测方面有着良好的应用前景。Based on tunable diode laser absorption spectroscopy（TDLAS）technique,an acetylene（C_2H_2）online detection system was developed by using the absorption band at the wavelength of 1.534μm of C_2H_2 molecule.The sensing system consists of four modules including a distributed feedback（DFB）laser,a DFB laser driver,agas cell with single optical path and a data processing module.With the prepared standard C_2H_2 gas sample,detailed measurements were carried out to study the detection performance of the system.Experimental results reveal that,the limit of the system（LOD）is about 0.02%;agood linear relationship is observed between C_2H_2 gas concentration and the amplitude of the 2fsignal is within the range of 0.02%~1%.A long-term measurement lasting for 20 hon a 0.5% C_2H_2 gas sample was carried out to test the stability of the system.Compared with the C_2H_2 detection systems utilizing quantum cascaded lasers（QCLs）and wideband incandescence,this system has great advantage due to the capability of using long-distance and low-loss optical fiber for remote monitoring.With self-developed DFB laser driver and lock-in amplifier,the system has good prospects in industrial field because of its simple structure,low price and capability of easy to be integrated.

关 键 词：红外吸收光谱 可调谐激光二极管光谱吸收 乙炔检测 

分 类 号：TH744.4[机械工程—光学工程]