基于Goertzel算法的红外气体检测方法

李唐安; 李世阳; 张家明; 孙轩; 郭荣静

doi:doi:10.3788/irla201948.0304003

红外与激光工程, 2019, 48 (3): 0304003, 网络出版: 2019-04-06

基于Goertzel算法的红外气体检测方法

Infrared detection method of gas based on Goertzel algorithm

论文大纲

李唐安 ^*李世阳张家明孙轩郭荣静

作者单位

上海交通大学仪器科学与工程系, 上海 200240

红外热释电 Goertzel算法滤波气体检测 infrared pyroelectric Goertzel algorithm filter gas detection

摘要

基于红外热释电原理的测量方法有测量方便、寿命长、功耗低等优点, 因此, 红外热释电测量气体在城市管网、环境监测等场合的气体测量监控系统中得到了广泛应用。在红外热释电气体测量过程中, 测量结果易受多频段信号的干扰, 直接导致测量精度不高。因此, 提出基于Goertzel算法的红外热释电气体测量方法, 对AD获取的信号进行数字滤波处理。仿真分析并对比Goertzel算法和移动平均算法的滤波效果, 仿真结果表明: Goertzel算法滤波误差为0.166 7%, 测量波动为0.058%, 比移动平均算法精度和稳定度分别提高51倍和18.4倍。最后通过搭建实验系统进行测试, 结果表明: Goertzel滤波算法能有效地提高整体气体浓度测量精度和稳定度, 测量精度能达到±4 ppm左右。

Abstract

The measurement method based on infrared pyroelectric principle has the advantages of convenient measurement, long life, low power consumption, etc. Therefore, gas measurement, based on infrared pyroelectric has been widely used in the gas measurement monitoring system of urban pipe network, environmental monitoring and other occasions. However, in the infrared pyroeletric gas measurement, there will be multi-frequency interference signal mixed in output signal, which directly leads to low measurement accuracy. To solve this problem, infrared pyroelectric gas measurement method based on Goertzel algorithm was proposed, and the signal acquired by the AD was processed by digital filtering. Simulation analysis and comparison of filtering effect between Goertzel algorithm and moving average algorithm was finished. The simulation results show that Goertzel algorithm has filtering error of only 0.166 7%, variation size of the measurement result is only 0.058%, and its accuracy and stability are 51 and 18.4 times better than the moving average algorithm, respectively. Finally, an experiment system was built, and the measured results show that Goertzel filter algorithm can effectively improve measurement accuracy and stability of the gas concentration, and the measurement accuracy can reach ±4 ppm.

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李唐安, 李世阳, 张家明, 孙轩, 郭荣静. 基于Goertzel算法的红外气体检测方法[J]. 红外与激光工程, 2019, 48(3): 0304003. Li Tang′an, Li Shiyang, Zhang Jiaming, Sun Xuan, Guo Rongjing. Infrared detection method of gas based on Goertzel algorithm[J]. Infrared and Laser Engineering, 2019, 48(3): 0304003.

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