基于小波分析的虚拟甲烷浓度谐波检测仪  

A Virtual Instrument of Methane Concentration Harmonic Detection Based on Wavelet Analysis

作　　者：王吉元[1] 

机构地区：[1]黑龙江科技学院电气与信息工程学院,黑龙江哈尔滨150027

出　　处：《测控技术》2009年第7期1-3,6,共4页Measurement & Control Technology

摘　　要：基于甲烷气体的谐波检测技术,在LabVIEW虚拟仪器设计平台上采用小波分析技术对光谱信号进行去噪,并采用快速傅里叶变换对去噪后的信号进行频谱分析,获得甲烷气体吸收光谱一、二次谐波的幅值,实现甲烷气体浓度检测。实验结果表明,利用该方法可以很好地去除噪声,精确地提取出谐波信号,获得较好的信噪比。Based on the technology of methane frequency harmonic detection, the noise of spectrum signals is eliminated by using wavelet analysis on the virtual instrument design platform of LabVIEW, and the fundamental and second harmonic signal of spectrum absorption of methane is measured by FFF, which can measure the concentration of methane. The experimental results indicate that the method using wavelet can eliminate the noise efficiently, extract the harmonic signal precisely and gain a better signal-to-noise ratio.

关 键 词：甲烷浓度 小波分析 LABVIEW 谐波检测 虚拟仪器 

分 类 号：TP216.1[自动化与计算机技术—检测技术与自动化装置]