空间双光路红外CO_2气体传感器及其测量模型  

Infrared CO_2 gas sensor based on space double beams and its measurement model

作　　者：李亚萍[1] 张广军[1] 李庆波[1] 

机构地区：[1]北京航空航天大学精密光机电一体化技术教育部重点实验室,北京100083

出　　处：《光学精密工程》2009年第1期14-19,共6页Optics and Precision Engineering

基　　金：国家863计划项目

摘　　要：提出了一种基于空间双光路结构的红外CO2气体传感器。阐述了传感器光学探头的结构和工作原理，并给出了气室的几何形状和相应的尺寸参数。以朗伯-比尔定律为理论依据，结合空间双光路结构的工作机理．以及红外光源周期性开关的工作方式．推导出了该传感器的线性测量模型，并采用最小二乘法对建立的测量模型进行标定。在静态下对该传感器的传感特性进行了测试，测试结果表明：在0～3％的测量范围内，该传感器的实验值与真实值符合较好，其精度为0．0242％；系统运行良好，可无故障连续在线测量30d以上。该传感器能有效消除温度信号和背景光信号的干扰．能够在5～40℃的温度内、不同杂光背景下正常工作，基本满足CO2气体浓度测量的功耗低、精度高、稳定性好等要求。An infrared CO2 gas sensor was developed based on space-double-beam structure. First,the structure and working principle of the optical probe were introduced. A new type gas cell was presented and the optimal size of the gas cell were calculated in detail. Then, the linear mathematical model of the sensor was established based on Lambert-Beer Law, the principle of space-double beam optical structure and the working model of an infrared light source in turning on and off periodically. Finally, the unknown coefficients in the mathematical model were calculated with Least Squares Method. The characteristics of the infrared sensor were tested in static state, tested results show that the values obtained from the experiment is close to the true values and the accuracy of the sensor is 0. 024 2% when measurement range is 0-3%. The system can work continuously more than 30 days without the disturbance from the temperature signal and background optical signal, it also can work at 5-40℃ and on different background conditions. These results conclude that the sensor can satisfy the system requirements of lower-power-consume, higher-precision and stability.

关 键 词：空间双光路 红外吸收 CO2气体传感器 最小二乘法 

分 类 号：TN214[电子电信—物理电子学]