干扰吸收峰影响下TDLAS温度测量方法研究  

Method of TDLAS temperature measurement under influence of interference absorption peak

作　　者：梅园园 蔡静[1] 常海涛 许江文 MEI Yuanyuan;CAI Jing;CHANG Haitao;XU Jiangwen(Changcheng Institute of Metrology&Measurement,Beijing 100095,China;College of Metrology&Measurement Engineering,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]航空工业北京长城计量测试技术研究所,北京100095 [2]中国计量大学计量测试工程学院,浙江杭州310018

出　　处：《计测技术》2022年第4期27-34,共8页Metrology & Measurement Technology

基　　金：国家科技重大专项(J2019-V-0005-0098)。

摘　　要：为解决目前TDLAS波长扫描直接吸收法测温领域存在的干扰吸收峰影响温度测量准确性的问题,提出了一种基于吸收光谱线型对称的积分吸光度计算方法,利用中心频率至无干扰吸收峰一侧频率范围的吸光度,根据对称性得到全频域的积分吸光度,以此来排除干扰吸收峰的影响,提高温度测量准确性。选取7185.6 cm和7444.4 cm两条HO吸收谱线,利用吸收光谱仿真数据在400~2600 K温度范围内选择8个温度点进行温度仿真计算,同时在实验室环境下搭建一套TDLAS测量系统,在573~1173 K温度范围内进行了管炉测温实验,并将吸收光谱线型对称积分吸光度计算法的测量结果与忽略干扰峰影响的单峰法的测量结果进行对比,结果显示:二者仿真计算温度的平均相对误差分别为1.11%和5.66%,实验测量温度的平均相对误差分别为1.02%和9%,验证了存在干扰吸收峰时根据线型对称性获取积分吸光度进行温度测量的可行性与准确性,为推动TDLAS温度测量技术发展提供了重要借鉴。In order to solve the problem that the interference absorption peak affects the accuracy of temperature measurement in the current TDLAS wavelength scanning direct absorption method temperature measurement,an integral absorbance calculation method based on the symmetry of absorption spectral line was proposed.By using the absorbance in the frequency range from the center frequency to the side of the noninterference absorption peak,the integral absorbance in the whole frequency domain is obtained according to the symmetry,so as to eliminate the influence of the interference absorption peak and improve the temperature measurement accuracy.Two HO absorption lines at 7185.6 cmand 7444.4 cmwere selected,and 8 temperature points were selected for temperature simulation calculation in the range of 400~2600 K using the absorption spectrum simulation data.At the same time,a TDLAS measurement system was set up in the laboratory environment to measure the tube furnace temperature in the temperature range of 573~1173 K,and the measurement results of the symmetrical integral absorbance calculation method of absorption spectral lines were compared with those of the single-peak method that ignored the influence of interference peaks.The results showed that the average temperature relative errors calculated by simulation are 1.11%and 5.66%respectively,while the average temperature relative errors measured by experiment are 1.02%and 9%respectively,which verifies the feasibility and accuracy of temperature measurement based on the integrated absorbance obtained by the symmetry of absorption spectral line in the presence of interference absorption peak.It provides an important reference for promoting the development of TDLAS temperature measurement technology.

关 键 词：激光吸收光谱 直接吸收法 温度测量 吸收光谱线型对称 

分 类 号：TB94[一般工业技术—计量学]