基于谐波检测技术的光纤甲烷气体传感器的研究  

A Methane Gas Sensor with Optic Fiber Based on Frequency Harmonic Detection Technique

作　　者：王玉田[1] 刘瑾[1] 张景超[1] 杨海马[1] 

机构地区：[1]燕山大学电气工程学院,河北秦皇岛市066004

出　　处：《测控技术》2003年第11期19-21,27,共4页Measurement & Control Technology

基　　金：河北省自然科学基金资助项目 (60 0 2 2 7)

摘　　要：基于甲烷气体的近红外吸收光谱 ,研究了一种高灵敏度光谱吸收型光纤甲烷气体传感器。采用DFBLD作为光源 ,通过光源调制实现气体浓度的谐波检测 ,利用二次谐波与一次谐波的比值来消除由光源的不稳定和变化所引起的检测误差。建立了谐波检测的数学模型 。Based on the near infrared spectral absorption of methane, a system using absorption type optic fiber for high sensitivity methane detection is demonstrated.DFB LD is used as a light source and light source modulation harmonic measurement is presented.The ratio of the fundamental and second harmonic signal can be used for eliminating the interference owing to light power changing.The mathematical model of gas concentration harmonic measurement is built up.The result of methane concentration is also shown.

关 键 词：气体传感器 甲烷 调制 谐波检测 

分 类 号：O439[机械工程—光学工程] TP212.2[理学—光学]