空芯光波导在光谱气敏检测中的应用  

Applications of Hollow Waveguide in Spectroscopic Gas Sensing

作　　者：李金义[1] 杜振辉[2] 王瑞雪[2] 杨旭[2] 宋丽梅[1] 郭庆华[1] LI Jin-yi DU Zhen-hui WANG Rui xue YANG Xu SONG Li-mei GUO Qing-hua(Key Laboratory of Advanced Electrical Engineering and Energy Technology, Tianjin Polytechnic University, Tianjin 300387, China State Key Lab of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China)

机构地区：[1]天津工业大学天津市电工电能新技术重点实验室,天津300387 [2]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《光谱学与光谱分析》2017年第7期2259-2266,共8页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(61505142);国家重大科学仪器设备开发专项(2012YQ06016501);天津市自然科学基金项目(16JCQNJC02100)资助

摘　　要：空芯光波导(HWG)用于光谱气体检测中,既可以实现光路的传输,又可以充当气体样品池实现长光程高灵敏度测量,具有体积小,响应时间快、成本低、光路稳定灵活等优点。介绍了基于镀银/碘化银的空芯光波导(Ag/AgI-HWG)、光子带隙空芯光波导(PBG-HWG)和基片集成空芯光波导(iHWG)等类型的空芯光波导,并总结了近年来空芯光波导在光谱气敏检测中的研究及进展,梳理了其应用方式及应用领域。研究表明,空芯光波导替代传统的气体池与傅里叶变换红外光谱(FTIR)、激光吸收光谱和拉曼光谱等不同的光谱技术结合已取得一系列成果,且已经应用于环境监测、呼气诊断和工业过程检测和控制等领域。其中,基于中红外激光吸收光谱的空芯光波导传感器组成相对简单,成本较低,与各类光波导的兼容性和环境适应性较强,发展前景较好。总之,随着激光技术、光波导技术和光谱技术的发展,基于空芯光波导的光谱气体检测正在迅速发展,并逐步由实验室走向现场应用。Hollow Waveguides（HWGs）are used in spectroscopic gas sensing devices as both a optical waveguide and gas transmission cell that provide an extended optical pathlength yielding high sensitivity measurements.Their advantages over traditional multipass gas cells are that they have a much smaller sample volume and can provide a faster response time as well as stable and flexible light path with lower cost.The studies recommend three main types of HWGs commonly used for gas sensing,namely Ag/AgI-coated hollow waveguides（Ag/AgI-HWG）,photonic bandgaps hollow waveguides（PBG-HWG）and substrate-integrated hollow waveguides（iHWG）,respectively.Research and development of spectroscopic gas sensing with HWG modules have been reviewed for the past few years.In addition,the application modes and fields have also been summarized.The studies show that HWGs have been coupled to FTIR,laser absorption spectroscopy（LAS）and Raman spectroscopy to replace conventional multipass gas cells.Now,a series of achievements were made and relevant applications of HWGs based gas sensing included atmospheric environment monitoring,breath diagnostics and industrial process monitoring.Particularly,the HWG sensors based on mid-infrared（MIR）LAS offer a number of advantages over other spectroscopic methods,i.e.,relative simple composition,low cost,superior compatibility with various of HWGs and strong adaptability to environment,which are fairly attractive for practical application.To summarize,with the development of laser technology,optical waveguide technology and spectral technology,HWG based spectroscopic gas sensing is developing rapidly,and gradually operated from the laboratory to the field application.

关 键 词：空芯光波导 傅里叶变换红外光谱 激光吸收光谱 拉曼光谱 气体检测 

分 类 号：O657.3[理学—分析化学]