非色散红外CO_(2)气体传感器的抗温湿度干扰设计  

Anti-interference design of temperature and humidity for non-dispersive infrared CO_(2)gas sensor

作　　者：张加宏[1] 朱涵 顾芳 刘清惓[1] 裴昱[1] Zhang Jiahong;Zhu Han;Gu Fang;Liu Qingquan;Pei Yu(Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology,Nanjing University of Information Science and Technology,Nanjing 210044,China;School of Physics and Optoelectronic Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学江苏省大气环境与装备技术协同创新中心,南京210044 [2]南京信息工程大学物理与光电工程学院,南京210044

出　　处：《电子测量与仪器学报》2022年第7期160-169,共10页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金(61306138,41875035);江苏高校品牌专业建设工程二期项目(电子信息工程);教育部第二批新工科研究与实践项目(E-SXWLHXLX20202612)资助。

摘　　要：为了抑制环境温湿度对非色散红外(NDIR)CO_(2)气体传感器测量精度的严重干扰,从硬件补偿的角度出发,为其设计了低湿控制模块与恒温控制模块。采用由聚偏氟乙烯(PVDF)疏水滤膜与3A分子筛构造的气体干燥管过滤CO_(2)气体中的水份实现气室降湿,同时采用增量式比例-积分-微分(PID)算法调节包裹在光学气室外的加热片的功率,达到恒温效果。研究分析了温湿度对气体浓度测量精度的影响,对低湿恒温抗干扰设计进行了测试和验证。实验结果表明,基于气体干燥管的低湿控制模块能够将CO_(2)气体的湿度降低到8%左右,而恒温控制模块能够将气室温度稳定在40℃。在复杂温湿度环境下,0~2000×10^(-6)气体浓度范围内,具有抗温湿度干扰设计的CO_(2)气体传感器的浓度测量平均相对误差为8.38%,显著减小了检测系统的温湿度漂移,研究结果对于研制高性能的NDIR气体传感器有参考价值。In order to suppress the serious influences of environmental temperature and humidity on the measurement accuracy of the non-dispersive infrared(NDIR)CO_(2)gas sensor,the low humidity and constant temperature control modules were designed from the perspective of hardware compensation.The gas-drying tube constructed by the polyvinylidene fluoride(PVDF)hydrophobic filter membrane and 3A molecular sieve is used to reduce the humidity of gas chamber,and the proportion integration differentiation(PID)algorithm is applied to adjust the power of the heating plate wrapped the outside of optical gas chamber to achieve a constant temperature effect.The influence of humidity and temperature on the accuracy of gas concentration measurement is studied.At the same time,the anti-interference design of the low-humidity and constant-temperature is tested and verified.Experimental results show that the low humidity control module based on the gas-drying tube can reduce the humidity of CO_(2)gas to about 8%,and the constant temperature control module can stabilize the temperature of the gas chamber at 40℃.In a complex temperature and humidity environment,the average relative error of the concentration measurement of CO_(2)gas sensor including the anti-temperature and humidity interference design is 8.38%within the gas concentration range of 0~2000×10^(-6),which significantly reduces the temperature and humidity drift of the detection system.The research results have certain reference value for the development of high-performance NDIR gas sensors.

关 键 词：非色散红外 CO_(2)气体传感器 恒温模块 低湿模块 抗干扰设计 

分 类 号：TP219[自动化与计算机技术—检测技术与自动化装置] TN219[自动化与计算机技术—控制科学与工程]