基于数字锁相放大器的甲烷谐波检测虚拟系统  

Harmonic Detection Virtual System of Methane Concentration Based on Digital Lock-in Amplifier

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：《计算机测量与控制》2009年第6期1052-1054,共3页Computer Measurement &Control

摘　　要：基于甲烷气体的谐波检测技术,利用数字锁相放大器SR830检测甲烷气体吸收谱线的一、二次谐波,在LabVIEW虚拟仪器设计平台上设计甲烷浓度谐波检测虚拟仪器系统,实现了对数字锁相放大器的远程控制和对数据的采集与处理;实验结果与理论模型相吻合,充分验证了采用数字锁相放大器检测甲烷气体浓度可以精确的提取出谐波信号,获得较好的信噪比。Based on the technology of frequency harmonic detection, the fundamental and second harmonic signal of spectrum absorption of methane was measured by use of a digital lock-in amplifier （SR830）. Harmonic detection virtual instrument system of methane concentration is designed on the virtual instrument design platform of LabVIEW, which can remotely control the lock-in amplifier, and realize the collection and the processing of the data. The experimental results are in agreement with theoretical model, which fully confirms that a lock-in amplifier can get out the harmonic signal precisely and gain a better signal-to-noise ratio.

关 键 词：甲烷浓度 锁相放大器 谐波检测 LABVIEW 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]