红外CO_2传感器结构密封性对测量精度影响的实验研究

An Experimental Study of the Effect of Structure Sealing of Infrared CO_2 Sensor on Its Accuracy.

目的研究非参比式、单光束结构的红外CO2传感器结构密封性对测量精度的影响。方法设计两个实验,一个标定实验,一个实际使用情况模拟实验。两个实验的温度、压力和标准气体一致,而传感器结构中的死体积中CO2浓度不一致。结果死体积中CO2浓度的不一致,引起传感器示值不一致。结 论红外CO2传感器结构密封性对测量精度影响很大。采用密封死体积的方法可以减小或消除此影响。

Objective To study the effect of structure sealing of Infrared CO 2 sensor on its accuracy. Method Two experiments were designed. The IR CO 2 sensor based on infrared principle and no comparing lighting path with only one beam of light were calibrated in one experiment, and in the other experiment the sensors were placed in an environment simulating the practical condition. The temperature, pressure and standard gas were kept same in the two experiments while CO 2 concentrations in the dead volume were varied. Result Readings from the sensors varied with the variation of the CO 2 concentration in the dead volume of the sensors.Conclusion The structure sealing of the IR CO 2 sensor has great influence on its accuracy. A sealed dead volume in the IR CO 2 sensor can decrease or eliminate the effect.