仪表技术与传感器InstrumentTechniqueandSensor2024年第4期收稿日期:2023-09-14基于双通道检测技术的非分光红外CO2传感器设计与研究颜培宇1,2,张海庆1,2,张清1,2,张振1,21.中煤科工集团常州研究院有限公司;2.天地(常州)自动化股份有限公司摘要:针对传统红外气体传感器气室与信号处理模块分离存在体积大、灵敏度差的问题,基于非分光红外双通道检测技术,设计了一种小体积、高精度的红外CO2传感器。首先,对反射型气室进行光线追迹仿真,保证热释电探测器受到的红外辐射和气体吸收光路长度满足要求。同时,设计了可靠的光源驱动电路、带通放大电路;对传感器的温度漂移特性进行讨论,建立温度补偿算法模型。在温湿度箱中标定红外CO2传感器参数,通过拟合曲线得到常数a和n,以及温度补偿系数β。经过实验测试表明,该红外CO2传感器测量误差小于真值的±5%。关键词:非分光红外;双通道检测技术;温度补偿;CO2气体传感器中图分类号:TN219文献标识码:ADesignandResearchofNon-dispersiveInfraredCO2SensorBasedonDual-channelDetectionTechnologyYANPeiyu1,2,ZHANGHaiqing1,2,ZHANGQing1,2,ZHANGZhen1,21.ChangzhouResearchInstituteCo.,Ltd.,ChinaCoalTechnologyandEngineeringGroup;2.Tiandi(Changzhou)AutomationCo.,Ltd.Abstract:Aimingattheproblemsoflargevolumeandpoorsensitivitycausedbytheseparationofthegaschamberandsig-nalprocessingmoduleoftraditionalinfraredgassensors,basedonnon-dispersiveinfrareddual-channeldetectiontechnology,asmall-sizedandhigh-precisioninfraredCO2sensorwasdesigned.First,raytracingsimulationonthereflectivegaschamberwasperformedtoensurethattheinfraredradiationreceivedbythepyroelectricdetectorandthegasabsorptionopticalpathlengthmettherequirements.Atthesametime,areliablelightsourcedrivecircuitandbandpassamplificationcircuitweredesigned,thetem-peraturedriftcharacteristicsofthesensorwerediscussedandatemperaturecompensationalgorithmmodelwasestablished.TheparametersoftheinfraredCO2sensorwerecalibratedinatemperatureandhumiditychamber,andtheconstantsaandn,aswellasthetemperaturecompensationcoefficientβ,wereobtainedbyfittingthecurve.ExperimentaltestsshowthatthemeasurementaccuracyoftheinfraredCO2sensorreaches±5%ofthetruevalue.Keywords:non-dispersiveinfrared;d...
