基于TDLAS技术的水汽低温吸收光谱参数测量

发布时间：2018-03-11 12:42

本文选题：可调谐二极管激光器　切入点：吸收光谱　出处：《物理学报》2017年20期 　论文类型：期刊论文

【摘要】：精确的气体光谱参数对气体浓度、温度等的光谱精确反演测量具有十分重要的意义,针对当前主流光谱数据库(例如HITRAN)中数据与实际数值存在相当误差的问题,自主研制了一套基于静态冷却技术的低温光谱实验平台,用于精确测量低温下的气体吸收光谱参数.运用该低温光谱实验平台,采用可调谐二极管激光吸收光谱(TDLAS)技术测量了温度为230—340 K、压强为10—1000 Pa时7240—7246 cm~(-1)波段的纯水汽振转跃迁光谱.采用Voigt线型多峰拟合方法,获得了5条水汽振转跃迁谱在不同温度、不同压强下的积分吸光度值及洛伦兹展宽值,运用线性拟合的方法得到这5条吸收线的自展宽半峰全宽系数及参考温度下的线强值.运用不确定度传递公式,计算得到实验结果的不确定度,与HITRAN2012数据库中的线参数进行对比,所测的5条吸收线中实验结果与数据库值最大相差10.96%,且实验结果的不确定度为1.11%—2.98%(置信概率p=95%,包含因子k=2),小于HITRAN2012数据库值的不确定度.
[Abstract]:Accurate spectral parameters of gas are of great significance to the spectral inversion of gas concentration, temperature, etc. Aiming at the problem that the data in the current mainstream spectral database (such as HITRAN) are quite different from the actual values, A set of low temperature spectrum experimental platform based on static cooling technology has been developed, which is used to accurately measure the parameters of gas absorption spectrum at low temperature. The pure water vapor vibrational transition spectra in the temperature range of 230-340 K and the pressure of 10-1000 Pa were measured by tunable diode laser absorption spectroscopy (TDLASS). Using the Voigt linear multi-peak fitting method, five water vapor vibrational transition spectra were obtained at different temperatures. The integral absorbance value and Lorentz broadening value at different pressures are obtained by linear fitting method. The full width coefficient of the self-broadening half peak and the line strength at the reference temperature are obtained by the linear fitting method, and the uncertainty transfer formula is used. The uncertainty of the experimental results is calculated and compared with the line parameters in the HITRAN2012 database. Among the five absorption lines measured, the maximum difference between the experimental results and the database value is 10.96, and the uncertainty of the experimental results is 1.11-2.98 (confidence probability p95, including the factor kan2n, less than the uncertainty of the HITRAN2012 database value.
【作者单位】：中国科学院合肥物质科学研究院安徽光学精密机械研究所环境光学与技术重点实验室;中国科学技术大学;
【基金】：国家重大科学仪器设备开发专项(批准号:2014YQ060537)资助的课题~~
【分类号】：O433.1

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