基于差分后谐波检测的瓦斯浓度传感器研究  

Research on Methane Concentration Sensor Based on Difference and Harmonic Detection

作　　者：杨伟红[1,2] 刘克铭[1] 徐广明[1] 任兰柱[1,3] 

机构地区：[1]辽宁工程技术大学机械学院,辽宁阜新123000 [2]东北大学机械学院,沈阳110004 [3]北京科技大学机械学院

出　　处：《传感技术学报》2011年第6期803-807,共5页Chinese Journal of Sensors and Actuators

基　　金：辽宁工程技术大学优秀青年基金项目

摘　　要：介绍了瓦斯浓度传感器系统的基本原理,提出了基于差分后谐波检测的瓦斯浓度检测模型,建立了瓦斯浓度传感器数学模型,设计了传感器系统结构,并对传感器进行了实验研究。差分后谐波检测模型利用参考光路与检测光路光强的差分消去一次谐波分量,对差分后的信号再进行二次谐波检测,最后检测二次谐波与一次谐波的比值得出气体浓度。在气室中利用起偏器产生线偏振光作为光信号输入,利用检偏器检测线偏振光。实验结果表明使用该方法提高了系统光路的抗干扰能力和检出二次谐波分量的能力,有效地提高了系统的灵敏度和分辨率,具有良好的检测效果。Basic principle of methane concentration sensor system was introduced.Methane concentration detection model based on difference and harmonic detection was presented.Mathematical model of methane concentration sensor was established.System structure of the sensor was designed,and experimental research on the sensor was carried out.Using the difference between referenced light intensity and metrical light intensity,difference and harmonic detection model can counteract the first harmonic component.Through detecting the second harmonic of difference signal,and then detecting the ratio of the second harmonic and the first harmonic,gas concentration can be obtained.In gas chamber,linearly polarized light which is used as input optical signal is produced by polarizer and detected by analyzer.The experimental results show that the system ability of optical path anti-interference and detecting the second harmonic component is improved,and the sensitivity and resolution of the system are increased too by using this method.This method has good detection effects.

关 键 词：传感器技术 差分 谐波检测 偏振光 瓦斯 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置]