前向散射式能见度仪检测不确定度评定方法

Uncertainty Evaluation Method of Forward Scattering Visibility Meter Test

根据能见度计量检测实验室(合肥)前向散射式能见度仪检测实例,展示了前向散射式能见度仪检测结果的测量不确定度评定方法。首先,介绍了能见度检测系统组成和技术要求;其次,建立前向散射式能见度仪示值误差测量模型,分析了测量不确定度来源;最后,依据不同的评定方法,对测量不确定度分量进行评定。研究结果表明:前向散射式能见度仪检测结果的不确定度分量主要有被测能见度仪、测量标准器、试验舱引入的标准不确定度。在50m和200m检测点,示值误差的扩展不确定度U(k=2)分别为4.9m和14.3m;在500~10000m检测点,相对扩展不确定度U(k=2)在8.5%~11.0%之间。

Based on the testing example of visibility measurement and testing laboratory(Hefei),the measurement uncertainty evaluation method of visibility measurement and testing results with a forward scattering visibility meter are presented.Firstly,the composition and technical requirements of the visibility detection system are introduced.Secondly,the measurement model of the indication error of the forward scattering visibility meter is established,and the source of measurement uncertainty is analyzed.Finally,the measurement uncertainty component is evaluated according to different evaluation methods.The results show that the uncertainty components of the forward scattering visibility meter mainly include the visibility meter to be measured,the measuring standard and the standard uncertainty introduced by the test chamber.At 50 mand 200 mdetection points,the indication error’s extended uncertainty U(k=2)is4.9 mand 14.3 m,respectively.The relative extended uncertainty U(k=2)is between 8.5%and 11.0%at the detection point from 500 mto 10,000 m.