应用光学, 2018, 39 (6): 809, 网络出版: 2019-01-10   

结合环境参数修正的高温气体光谱检测系统设计

Design of high temperature gas spectrum detection system combined with environmental parameters modification
作者单位
1 安徽建筑大学 机械与电气工程学院, 安徽 合肥 230601
2 中国科学院安徽光学精密机械研究所 中国科学院环境光学与技术重点实验室, 安徽 合肥 230031
摘要
随着工业化进程加快, 大气污染监控已受到广泛关注, 为实现工业过程痕量气体浓度的准确监测, 采用可调谐半导体激光吸收光谱技术(TDLAS)搭建了气体浓度在线监测系统, 并以LabVIEW为软件开发平台完成了可视化界面。重点设计了数据处理功能及浓度反演算法, 通过同步获取的环境压力参数对特征吸收光谱的有效拟合范围进行修正, 提高吸光度信号的准确性, 再通过读取的环境温度参数修正气体吸收线强以获得精确的浓度结果。将该系统应用于高温氨浓度在线测量实验中, 获得高温不同压力下的氨气浓度测量结果。实验结果表明, 在500 K温度下, 不经过压力、温度参数修正的最大氨浓度反演偏差为18.81%, 通过参数判断后再进行光谱提取和修正, 得到浓度最大偏差为3.96%。该系统能够准确反演不同环境参数(压力、温度)下的气体浓度, 实现了工业高温现场气体的实时、精确在线测量。
Abstract
With the acceleration of industrialization, air pollution monitoring has received widespread attention. In order to realize accurate monitoring of trace gas concentration in industrial process, an on-line monitoring system of the gas concentration was built with tunable diode laser absorption spectroscopy technology (TDLAS) and the visualization interface was completed with LabVIEW as the software development platform. The data processing function and gas concentration inversion algorithm were mainly designed, and the effective fitting range of characteristic absorption spectrum was corrected by the environmental pressure parameters obtained synchronously, so the accuracy of absorbance signal was improved. Then by reading the ambient temperature parameters, the gas absorption line was modified to obtain accurate concentration results. The system was applied to the on-line measurement of ammonia concentration at high temperature, and the result of ammonia concentration at high temperature and different pressure was obtained. The result shows that by the spectrum extraction and correction after the determination of parameters, the maximum calculation deviation of ammonia concentration is 3.96% at 500 K, while the maximum inversion deviation of ammonia concentration without modification of pressure and temperature parameters is 18.81%. The system can precisely retrieve the gas concentration under different environmental parameters (pressure and temperature) and realize accurate real-time on-line measurement of industrial high temperature field gas.

贾巍, 何莹. 结合环境参数修正的高温气体光谱检测系统设计[J]. 应用光学, 2018, 39(6): 809. Jia Wei, He Ying. Design of high temperature gas spectrum detection system combined with environmental parameters modification[J]. Journal of Applied Optics, 2018, 39(6): 809.

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