光学技术, 2019, 45 (3): 269, 网络出版: 2019-08-07
基于小波优化EEMD的甲烷浓度检测信号研究
Research on methane concentration detection signal based on wavelet optimization EEMD
光谱学 红外差分吸收法 甲烷收发谱信号 集合经验模态分解(EEMD) 小波去噪 spectroscopy infrared differential absorption method methane transmission and reception spectrum signal collective empirical mode decomposition (EEMD) wavelet denoising
摘要
为了实现甲烷浓度的测量, 设计了基于差分吸收检测原理的甲烷浓度检测系统。检测系统中的气室部分使用了全反射棱镜配合凹面镜的方法来增加光程, 使光能够被气体充分吸收, 达到了提高测量精度的效果。在测量过程中, 受到环境因素的影响, 使得接受的信号中存在大量的噪声, 为此提出利用小波优化EEMD的方法对接收的信号进行去噪处理, 得到的信噪比为16.9925, 均方根误差为1.5447×10-4。实验结果表明相比于EEMD或小波的去噪方法, 使用小波优化后的EEMD具有更好的噪声抑制效果, 方法适用于甲烷收发谱信号的去噪处理。
Abstract
In order to measure the concentration of methane, a system for measuring the methane concentration based on difference absorption has been designed. In the gas chamber part of the detection system, it used the total reflection prism and the concave mirror to increase the optical path, it can make the light to be fully absorbed by the methane, and the measurement accuracy was improved. During the measurement process, due to the influence of environmental factors, there were a lot of noise in the received signal. Therefore, the method of wavelet optimization EEMD was proposed to denoise the received signal, the signal-to-noise ratio is 16.9925, and the root-mean-square error was 1.5447×10-4. The experimental results show that compared with EEMD or wavelet denoising method, the EEMD optimized by wavelet has better noise suppression effect. This method was suitable for the denoising of methane transceiver spectrum signal.
王书涛, 车先阁, 王志芳, 王贵川, 龚乐. 基于小波优化EEMD的甲烷浓度检测信号研究[J]. 光学技术, 2019, 45(3): 269. WANG Shutao, CHE Xiange, WANG Zhifang, WANG Guichuan, Gong le. Research on methane concentration detection signal based on wavelet optimization EEMD[J]. Optical Technique, 2019, 45(3): 269.