应用光学, 2020, 41 (2): 348, 网络出版: 2020-04-23   

气体浓度激光光谱检测温度影响修正研究 下载: 584次

Study on temperature influence correction of gas concentration laser spectrum detection
作者单位
1 东北石油大学 土木建筑工程学院,黑龙江 大庆 163318
2 东北石油大学 电子科学学院,黑龙江 大庆 163318
3 中国石油四川石化有限责任公司,四川 成都 611930
摘要
基于激光吸收光谱技术的气体检测手段具有非接触,分辨率高,灵敏度高等优势,然而激光在线检测气体过程易受温度变化导致其浓度测量偏差增大。以氨气为研究对象,探究了温度对氨气吸收谱线线强的影响规律及影响机制,搭建了非常温条件(298 K至323 K)氨气激光检测实验平台,提出了气体吸光度-温度关联式法对浓度反演结果进行修正处理。结果表明:浓度一定时,总配分函数比值rQ是氨气分析吸收线强随温度升高过程中的主导控制因素,总配分函数比值与温度的负相关关系造成氨气光谱吸光度随温度升高而降低;修正前浓度反演值随着温度升高而降低,温度达到323 K时,浓度反演值为3.13%,与标准浓度值相比其误差高达37.4%,经过修正后的浓度反演值与标准浓度值的相对误差在0.2%~1.4%范围内。
Abstract
The gas detection method based on tunable semiconductor laser absorption spectroscopy has the advantages of non-contact, high resolution and sensitivity. However, the on-line detection of industrial gas by laser spectroscopy is susceptible to temperature changes, resulting in an increase in concentration measurement deviation. Study on ammonia, the mechanism of temperature effect on the absorption spectroscopy characteristics was explored, the experimental platform for ammonia laser detection at various temperatures (298 K to 323 K) was built, and the gas absorbance-temperature correlation method was proposed to correct the concentration inversion results. The results show that, the ratio of total partition function rQ is the dominant parameter affecting the spectral line intensity of ammonia at the same concentration. The spectral line intensity decreases with the increase of temperature due to the linear decrease of rQ with the rise of temperature. When the ambient temperature of ammonia reaches 323 K, the inversion value is 3.13%, and the relative error between the inversion value and the standard concentration value is as high as 37.4%. After correction, the relative error between the inversion value and the standard concentration value is in the range of 0.2%~1.4%.

王迪, 李玉爽, 濮御, 吕妍, 耿金剑, 李栋. 气体浓度激光光谱检测温度影响修正研究[J]. 应用光学, 2020, 41(2): 348. Di WANG, Yushaung LI, Yu PU, Yan LYU, Jinjian GENG, Dong LI. Study on temperature influence correction of gas concentration laser spectrum detection[J]. Journal of Applied Optics, 2020, 41(2): 348.

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