传感技术学报2011，Vol.24Issue(6)：803-807,5.DOI:10.3969/j.issn.1004-1699.2011.06.005
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
摘要
Abstract
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Key words
sensor technology/difference/harmonic detection/polarized light/methane分类
信息技术与安全科学引用本文复制引用
杨伟红,刘克铭,徐广明,任兰柱..基于差分后谐波检测的瓦斯浓度传感器研究[J].传感技术学报,2011,24(6):803-807,5.基金项目
辽宁工程技术大学优秀青年基金项目 （）
