基于正交偏振光的瓦斯浓度传感器研究

Methane Concentration Sensor Based on Orthogonal Polarized Light

介绍了瓦斯浓度传感器系统的基本原理,提出了基于正交偏振光的差分吸收式瓦斯浓度检测模型,建立了瓦斯浓度传感器的数学模型,设计了传感器系统结构以及光路和气室结构,并对传感器进行了实验研究。传感器系统利用起偏器将两束不同波长的单色光转变为正交偏振光,然后让这两束正交偏振光同时通过检测气室,最后用渥拉斯顿棱镜将两束单色光分开,并用光电探测器分别实现两束单色光的光强信号提取。实验结果表明,使用该方法提高了系统的灵敏度和分辨率,传感器线性度和稳定性好,抗干扰能力强,具有良好的检测效果。

Basic principle of methane concentration sensor system was introduced.Methane concentration detection model of difference absorption structure based on orthogonal polarized light was presented.Mathematical model of methane concentration sensor was established.System structure of the sensor was designed and structure of optical path and gas chamber of the sensor was designed.Experimental research on the sensor was carried out.Using the polarizer,the sensor system transformed two difference wavelength monochromatic lights into orthogonal polarized lights,and then made the two orthogonal polarized lights pass the detection gas chamber simultaneously.Finally,the two monochromatic lights were separated by Wollaston prism,and light intensity signal of the two monochromatic lights was collected respectively by photodetectors.The experimental results show that the sensitivity and resolution of the sensor system were improved by using this method.The sensor has good linearity,stability,and strong anti-interference ability.This method has good detection effects.