双翻斗雨量传感器测量数据不确定度评定

Uncertainty Evaluation of Measurements from Double-Tipping Bucket Raingauges

根据自动气象站雨量传感器检定规程和测量不确定度评定的过程与方法,以实验室检定SL3-1型双翻斗雨量传感器为例,通过逐项分析误差来源及其引入的不确定度分量,针对各分量分别使用不同的评定方法和数学方法计算了各项标准不确定度,最终给出了实验室检定双翻斗雨量传感器的扩展不确定度:在大小两种雨强下,测量不确定度均为U95=0.14mm,包含因子k95=2.06。经传递比较法验证,评出的测量不确定度结果满足了计量标准考核规范和法定计量检定机构考核规范中的相关要求。该研究完善了雨量传感器的实验室检定工作流程,提高了工作质量。

According to the verification regulations for rainfall sensors of automatic meteorological stations and the procedures and methods of measurement uncertainty evaluation, the sources of measurement errors and the resulted measurement uncertainty are analyzed. Using different types of evaluation approaches and different mathematical calculation methods, the standard uncertainty for each component is evaluated, and ultimately the expanded uncertainty of the indoor verification measurement results of the SL3-1 double- tipping-bucket raingauge is given. For two types of precipitation intensity, the measurement uncertainty U95 = 0.14 ram, and the coverage factor k95 = 2.06. The verification by the comparative transmission method indicates that the measurement uncertainty meets the requirements of the related rules for the examinations of both measurement standards and legal metrological verification service. This evaluation method can improve the work flow and the quality of indoor rainfall sensor verification.