差分吸收式光纤甲烷气体传感器的研究  

Study on Difference Absorption Optical Fiber CH 4 Sensor

作　　者：王玉田[1] 郭增军[1] 王莉田[1] 

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066004

出　　处：《光电子．激光》2001年第7期675-678,共4页Journal of Optoelectronics·Laser

基　　金：河北省自然科学基金资助项目 (6 0 0 2 2 7)

摘　　要：根据甲烷气体的吸收光谱 ,研究了用 L ED作光源的差分吸收式光纤甲烷气体传感器。选择两个同型号 L ED光源作为差分吸收信号 ,光源驱动器自动实行交替斩波。建立了气体浓度差分吸收的数学模型 ,给出了甲烷气体浓度的测量结果。实验表明该仪器的测量灵敏度达到 2× 10 - 4。Based on the CH 4 absorption spectrum,a novel kind of transmission type optical fiber CH 4 sensor with the low cost illuminant of LED is presented in this paper.Two same types of LED illuminant are selected as difference absorption signals,and automatic alternate chopping is realized by illuminant driver.The mathematical model of gas concentration difference absorption is built up.The final measurement results of CH 4 concentration are also shown.Our experiment has proved that the measurement sensibility of this sensor is 2×10 -4 .

关 键 词：光纤 甲烷 差分光吸收 气体传感器 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]