Uncertainty Evaluation and Optimal Formula Verification for Eddy Current Device Flow Test
The uncertainty evaluation of the measured mass flow in the flow test system of eddy current device is carried out.It is found that the extended uncertainty(Ucw)of the measured mass flow(Wa)is 3.91％,k=2.626,and the confidence level is 99％,in which the environmental factor is the largest uncertainty component(uρ=1.447％).Therefore,three conversion formulas are proposed to reduce the influence of environmental factors and improve the test accuracy.By calculating and analyzing the results of the uncertainty propagation rata formula and the test statistics data of the three conversion formulas,it is found that all the three conversion formulas can improve the test accuracy to less than 1.0％,which can meet the test accuracy requirements.The conversion formula B has the minimum extended uncertainty value(USB=0.582％,k=2.632,and the confi-dence level is 99％),and its uncertainty is about 1/6 before the conversion.Therefore,the error of the result after conversion by using the conversion formula B is smaller and the precision is higher,which can provide re-liable test data support for the qualified product evaluation of eddy current device,and has good engineering application value.
eddy current device flow testconversion mass flowstandard sampleuncertaintycorrection
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