引用格式:吴丹,赵红达,张国城,等.光散射法扬尘在线监测仪自动校零模式及其影响[J].中国测试,2023,49(9):133-138.WUDan,ZHAOHongda,ZHANGGuocheng,etal.Studyonautomaticzerocorrectionmodeanditsinfluenceonlightscatteringonlinedustmonitor[J].ChinaMeasurement&Test,2023,49(9):133-138.DOI:10.11857/j.issn.1674-5124.2021100078光散射法扬尘在线监测仪自动校零模式及其影响吴丹,赵红达,张国城,刘佳琪,沈上圯,田莹(国家生态环境监测治理产品质量监督检验中心(北京)北京市计量检测科学研究院,北京100029)摘要:自动校零功能是要求光散射法扬尘在线监测仪在长期使用过程中数据漂移后进行自我修正,以减少缺乏自净功能带来的测量误差。该文搭建扬尘监测仪校准装置,探究市场上常见3类自动校零结构(无切换阀、前置切换阀、后置切换阀)高浓度淹没实验前后对零点测量效率、仪器采样流量、测量误差的影响。研究发现3种结构仅能实现“零点测量”,未实现零点校准,而零点测量效率为无切换阀>后置切换阀>前置切换阀。此外,前置切换阀积灰容易造成传感器二次污染,后置切换阀易造成传感器污染,均会影响传感器测量误差。因此,光散射扬尘在线监测仪需与传感器校零算法或定期清洗等方式相结合来最终实现目的,现有标准、规范需进一步细化对自动校零功能的检测方法和性能指标的设定,从而提高扬尘在线监测仪测量准确性和稳定性。关键词:光散射法;扬尘在线监测仪;自动校零;零点测量效率中图分类号:TB9文献标志码:A文章编号:1674–5124(2023)09–0133–06StudyonautomaticzerocorrectionmodeanditsinfluenceonlightscatteringonlinedustmonitorWUDan,ZHAOHongda,ZHANGGuocheng,LIUJiaqi,SHENShangyi,TIANYing(NationalQualitySupervisionandInspectionCenterforEco-environmentalProducts,BeijingInstituteofMetrology,Beijing100029,China)Abstract:Automaticzerocalibrationfunctionwererequiredtolightscatteringonlinedustmonitorstoself-correctedafterdatadriftintheprocessoflong-termuse,soastoreducethemeasurementerrorcausedbylackofself-cleaningfunction.Adustmonitorcalibrationdevicewassetuptostudytheeffectsofautomaticzerocalibrationstructuresincludingnoswitchingvalve,frontswitchingvalveandrearswitchingvalveandthehigh-concentrationinundateexperimentonzero-pointmeasurementefficiency,instrumentsamplingflowrate...