摘要
在湿度传感器检定过程中,除露点仪和温湿度箱引起检定结果的不确定度外,检定条件、操作不规范也会给检定结果带来附加误差。本文通过对标准器的各湿度点测得值标准偏差、露点仪工作时的热效应、掠过露点传感器的流量变化、露点仪最佳工作环境等进行了实际测试,结合湿度传感器测试历史资料,进行了综合分析。结果表明:(1)露点仪露点传感器的过流孔正对气流方向时,同温度下露点温度测得值偏高,露点仪测量的相对湿度偏小,否则会偏大。(2)在环境温度为20℃时,露点仪在各个湿度点上的n次测量值的标准偏差(离散性)最小。(3)露点仪的温度传感器在吸入式温湿度箱中,安装于露点传感器前端4cm和后端4cm时,其后端测得值比安装在前端测得值的最大值偏高0.45℃,相对湿度偏高0.5%。(4)各湿度点上的稳定时间(当箱内湿度达到设定值并趋于稳定后)应大于或等于20s时,露点仪和被检湿度传感器采集到的标准值和测量值才真实。
In the verification process of the humidity sensor,in addition to the uncertainty of verification results caused by the dew-point meter and temperature and humidity box,the verification conditions and non-standard operation will also bring additional errors to the verification results.In this paper,the standard deviation of the measured value at each humidity point of the dew-point meter,the thermal effect of the dew-point meter during operation,the flow change of the sensor skimming the dew-point meter,and the optimum working environment of the dew-point meter are tested.Combined with the historical data of the humidity sensor test,a comprehensive analysis is made to draw the following conclusions:(1)When the flow hole of the dew-point sensor is facing the airflow direction,the dew-point temperature measured at the same temperature is higher,and the relative humidity measured by the dew-point sensor is smaller.Otherwise,it will be larger.(2)When the ambient temperature is 20℃,the standard deviation(discreteness)of the measurements of the dew-point meter at each humidity point is minimum.(3)When the temperature sensor of the dew-point meter in the suction type temperature and humidity box is installed at 4 cm the front end at 4 cm the back end,the measured value of its rear end is 0.45℃higher than the maximum value installed at the front end,and the relative humidity is 0.5%higher.(4)The stability time at each humidity point(when the humidity in the box reaches the set value and tends to be stable)should be greater than or equal to 20 s,the standard value and measured value collected by the dew-point meter and humidity sensor under inspection are true.
作者
陈为超
范雪波
CHEN Weichao;FAN Xuebo(Huayun Sounding(Beijing)Meteorological Technology Co.,Ltd.,Beijing 102299;Beijing Meteorological Observation Center,Beijing 100176)
出处
《气象科技》
2021年第5期693-696,共4页
Meteorological Science and Technology
关键词
湿度传感器
露点仪
检定条件
影响测试与分析
humidity sensor
dew-point meter
verification condition
test and analysis
