非色散红外CO_(2)传感器温度补偿研究  

Research on temperature compensation method of non dispersive infrared CO_(2) sensor

作　　者：吴文杰[1] WU Wen-jie(Shangqiu Polytechnic,Shangqiu 476000,China)

机构地区：[1]商丘职业技术学院,河南商丘476000

出　　处：《激光与红外》2024年第6期935-942,共8页Laser & Infrared

基　　金：河南省高等学校重点科研项目(No.23B510014)资助。

摘　　要：为了解决非色散红外CO_(2)传感器在测量过程中易受温度影响的问题,提出双半椭球形双通道气体吸收腔室和广义高斯径向基函数神经网络补偿温度的新方法。首先双半椭球形双通道气体吸收腔室的半椭球形长轴右侧焦点与右半椭球形长轴左侧焦点重合,红外光源位于左、右半椭球形长轴的焦点重合处,检测器位于半椭球形长轴的另外一个焦点处,该结构能够使光线被气体充分接收,减小了光线传播过程中的损耗。接着差分计算单波长双通道热释电探测器输出电压获得CO_(2)气体浓度。最后分析广义高斯径向基函数神经网络形状参数与辅助形状参数对提高逼近效果的影响。实验显示在双半椭球形双通道气体吸收腔室结构中,长轴长度为4cm和短轴长度为3cm则CO_(2)气体吸收率达到最大值。常温25℃时,CO_(2)不同浓度测量误差变化不大,绝对误差波动范围在0.004%~0.006%之间,相对误差波动范围在0.067%~0.100%之间。CO_(2)浓度2%时,不同温度测量误差变化较大,绝对误差波动范围在0.001%~0.024%之间,相对误差波动范围在0.017%~0.400%之间,测量浓度为2%的CO_(2)气体传感器响应时间的6次平均值为27.46s,具有较快的响应时间。Aiming at the problem of non dispersive infrared CO_(2) sensor are susceptible to temperature,a new method of double semi ellipsoidal and double channel gas absorption chamber and generalized gaussian radial basis function neural network for temperature compensation is proposed in this paper.Firstly,the right focus of the semi ellipsoidal long axis coincides with the left focus of the right semi ellipsoidal long axis in the double semi ellipsoidal and double channel gas absorption chamber structure,the infrared light source is located at the overlap of the left and right semi ellipsoidal long axes,and the detector is located at another focus of the semi ellipsoidal long axis,which enables the light to be received by the gas sufficiently,and reduces the loss of light propagation.Secondly,the differential calculation of the output voltage of a single wavelength double channel pyroelectric detector is used to obtain the concentration of CO_(2) gas.Finally,the influence of shape parameters and auxiliary shape parameters of the generalized gaussian radial basis function neural network on improving approximation performance is analyzed.The experiment shows that CO_(2) gas absorption rate reaches its maximum value at a long axis length of 4cm and a short axis length of 3cm in the double semi ellipsoidal and double channel gas absorption chamber structure.At room temperature 250 C,the measurement error of different concentrations of CO_(2) is not much changed,with an absolute error fluctuation range of 0.004%~0.006% and the relative error fluctuation range is between 0.067%~0.100%.When the CO_(2) concentration is 2%,the measurement error varies greatly at different temperatures,with an absolute error fluctuation range of 0.001%~0.024% and the relative error fluctuation range is between 0.017%~0.400%.The average response time of a CO_(2) gas sensor with a measurement concentration of 2% for six times is 27.46 seconds,indicating fast response time.

关 键 词：双半椭球形 双通道 焦点 非色散红外 温度补偿 

分 类 号：TN21[电子电信—物理电子学] TP212.14[自动化与计算机技术—检测技术与自动化装置]