| Abstract: | The rainfall observation equipment mainly used in domestic civil aviation airports is the RG13 rainfall sensor produced by Vaisala, Finland. In order to ensure the authenticity and reliability of the rainfall measurement data, it is necessary to analyze the uncertainty of its measurement results.According to the field calibration method of the automatic weather station, repeated measurements of two types of precipitation intensity were conducted respectively, and the uncertainty of type A assessment is evaluated according to the evaluation and expression requirements of JJF1059.1-2012 measurement uncertainty. The sources of B uncertainty in the measurement process are analyzed and B uncertainty is evaluated. Finally,the extended uncertainty is obtained.The results show that Under the light rain intensity, the measurement uncertainty U95=0.17mm, including the factor k=2. Under the heavy rain intensity, the measurement uncertainty U95=0.16mm, including the factor k=2. This study improves the field calibration workflow of rainfall sensor and has reference value for the reliability evaluation of rainfall sensor measurement results. |
