非分光红外CO_(2)数字传感器设计与实现

Design and Implementation of Non-Dispersive Infrared CO_(2) Digital Sensor

针对市面上非分光红外CO_(2)数字传感器在小型化、数字化、模块化和国产化等方面发展不尽人意。基于不同气体分子的红外光谱吸收特性,利用朗伯-比尔红外吸收定律,运用电子学、机械学和光学等多门学科,对非分光红外CO_(2)数字传感器进行设计。整体方案设计主要内容包括光源选择、探测器选择、光学气室设计、硬件电路设计、软件设计。通过实验检测,测量结果完全达到设计要求,精度不低于±1×10^(-4)、测量范围1×10^(-5)~4.7×10^(-3)。结果表明,仪器测量范围广、精度高、预热启动时间短、成本低和模块化。

The development of non-dispersive infrared(NDIR)CO_(2) digital sensor in the market is unsatisfactory in miniaturization,digitization,modularization and localization.Based on the infrared spectrum absorption characteristics of different gas molecules,the non-dispersive infrared CO_(2) digital sensor is designed and implemented by using Lambert-Beer infrared absorption law,electronics,mechanics and optics.The main content of the overall plan design includes light source selection,detector selection,optical gas chamber design,hardware circuit design,and software design.Through experimental testing,the measurement results fully meet the design requirements,the accuracy is not less than ±100 ppm,and the measurement range is 10 ppm~4700 ppm.The results show that the instrument has a wide measurement range,high accuracy,short warm-up start time,low cost and modularity.