基于实时反射率修正的离轴积分腔甲烷测量系统  

Off-axis Integral Cavity Methane Measurement System Based on Real-time Reflectivity Correction

作　　者：陈海轩 周宾[1] 任红伟 寇潇文 祝仰坤 刘鹏飞 王一红[1] CHEN Hai-xuan;ZHOU Bin;REN Hong-wei;KOU Xiao-wen;ZHU Yang-kun;LIU Peng-fei;WANG Yi-hong(School of Energy and Environment,Southeast University,Nanjing 210096,China;R&D Center,Qinghai Salt Lake Industry Co.,Ltd.,Golmud 816000,China)

机构地区：[1]东南大学能源与环境学院,江苏南京210096 [2]青海盐湖工业股份有限公司研发中心,青海格尔木816000

出　　处：《仪表技术与传感器》2019年第8期64-69,91,共7页Instrument Technique and Sensor

基　　金：国家重点研发计划项目(2017YFB0603204);国家自然科学基金(50976024);国家自然科学基金青年科学基金(50906013)

摘　　要：针对大气CH4浓度测量中的H2O干扰以及高反镜反射率的标定问题,提出了一种波长调制离轴积分腔测量系统中反射率实时标定的方法,并结合CH4浓度免标定反演修正算法解决了CH4浓度测量中H2O干扰的问题,实现了大气CH4浓度的免标定测量。利用该系统对大气CH4浓度进行了测量,测量得到的大气CH4平均浓度为1.821 ppmv,标准偏差为0.024 ppmv,时间分辨率为10 s。Allan方差分析表明该测量系统检测限可达4.6 ppbv。因此,该系统可实现大气CH4浓度的免标定实时测量。Considering H 2O interference and high-reflection reflectance calibration for atmospheric CH 4 concentration measurement,a method for real-time calibration of reflectivity was proposed in a wavelength modulation off-axis integral cavity measurement system.The problem of H 2O interference in CH 4 concentration measurement was solved by CH 4 concentration calibration-free inversion correction algorithm,and calibration-free measurement of atmospheric CH 4 concentration was achieved.The system was used to measure atmospheric CH 4 concentration.The measured atmospheric CH 4 average concentration is 1.821 ppmv,the standard deviation is 0.024 ppmv,and the time resolution is 10 s.The Allan deviation is used to characterize the detection limit of the measurement system up to 4.6 ppbv.Therefore,the system can realize real-time calibration-free measurement of atmospheric CH 4 concentration.

关 键 词：离轴积分腔 甲烷 水蒸气 波长调制光谱 反射率 浓度测量 

分 类 号：TK314[动力工程及工程热物理—热能工程]