基于主成分分析的β射线法PM2.5测量准确性影响因素分析  

Influence Factor on PM2.5 Measurement Accuracy byβ-ray Method Based on Principal Component Analysis

作　　者：李德文 惠立锋[1] 吴付祥 LI De-wen;HUI Li-feng;WU Fu-xiang(China Coal Technology and Engineering Group Chongqing Research Institute,Chongqing 400037,China;State Key Lab.of Methane Disaster Monitoring&Emergency Technology,Chongqing 400039,China)

机构地区：[1]中煤科工集团重庆研究院有限公司,重庆400037 [2]瓦斯灾害监控与应急技术国家重点实验室,重庆400039

出　　处：《环境监测管理与技术》2020年第5期56-59,共4页The Administration and Technique of Environmental Monitoring

基　　金：国家重点研发计划基金资助项目(2017YFC0805200);天地科技股份有限公司科技创新创业基金资助项目(2018-TD-QN058)。

摘　　要：采用主成分分析法探究环境温度、湿度、动态加热温度、采样流量、分离器切割性能、走纸精度、本底值分析时间、采样时间等8项因素对β射线法PM2.5测量准确度的影响,定量分析各影响因素的贡献率并提出主要影响因素的影响程度、控制范围及方法。结果表明:走纸精度、动态加热温度及采样流量的贡献率之和为54.2%,对β射线法PM2.5测量结果影响较为明显。为使测量结果误差<5%,滤带定位误差应不超过1.3 mm,动态加热温度控制在45℃~50℃范围内,采样流量偏离在±0.8 L/min以内。The influences of eight factors:ambient temperature,humidity,dynamic heating temperature,sampling flow,separator cutting performance,paper feeding accuracy,analysis time of background value and sampling time on the accuracy of PM 2.5 measurement byβ-ray method were studied based on principal component analysis.The contribution rate of each factor was quantitatively analyzed and the influences of the main factors,control of scope and method were put forward.The results showed that the sum of the contribution rate of paper feeding accuracy,dynamic heating temperature and sampling flow rate was 54.2%,which had an obvious influence on PM 2.5 measurement byβ-ray method.In order to make the measurement error less than 5%,the positioning error of filter strip should not exceed 1.3 mm,the dynamic heating temperature should be in the range of 45℃~50℃,and the deviation of sampling flow should be within±0.8 L/min.

关 键 词：PM2.5 Β射线法 主成分分析法 影响因素 

分 类 号：X851[环境科学与工程—环境工程]