摘要
研究了一种差分吸收瓦斯浓度检测系统.基于近红外光谱吸收原理,分布反馈式激光器(DFB)发出波长为1 650 NM的光,一路经过光纤传输到待测气室与甲烷气体发生作用,另一路经过光纤直接传到参考气室,将两路携带有用信息的光信号通过硬件电路转换为电信号,由虚拟仪器开发的软件进行采集、处理,得到浓度与电压的信息.实验结果表明:该系统起到了实时检测与监控甲烷气体浓度的作用.
A system for measuring the methane concentration based on difference absorption has been studied. The light with central wavelength 1 650 nm is emitted by distribution feedback laser （DFB）, and one beam passes the methane gas in a gas cell, the other directly passes another reference gas cell. The useful light signal is converted into electric signal by hardware circuit. The relationship between concentration and voltage is obtained by virtual instrument software processing the voltage signal. The results of the experiments show that the real time detection and monitor of the methane gas can be completed in this system.
出处
《中北大学学报（自然科学版）》
EI
CAS
2006年第1期71-74,共4页
Journal of North University of China(Natural Science Edition)
基金
山西省工业攻关项目(051124-2)
山西留学归国人员基金(5210800)
山西省高校强校工程专项(52108)
关键词
虚拟仪器
甲烷
光纤传感器
差分吸收
virtual instrument
methane
optical fiber sensor
difference absorption
