Research on Volume Determination Method of Double Weighing in Air
SU Yi1,WANG Yang2,XIONG Zhong-qi1,HAN Yu1
1. Shanghai Institute of Mearsurement and Testing Technology,Shanghai 201203,China
2. China National Accreditation Service for Conformity Assessment,Beijing 100062,China
Abstract：To study the linear change of mass difference and air density difference under two different air densities when comparing the test weight and reference weight, the least square method is used to fit the curve of mass difference and air density difference, and the double weighing in air volume determination method is proposed.Based on the mathematical model and the working principle of the measuring device, three main factors affecting the results are analyzed: the range of atmospheric pressure, the desorption of the weight surface and the mass comparator. Taking the 10g~1kg OIML stainless steel weight as an example, the volume determined by this method is compared with the result of the hydrostatic method, and the normalized error En is less than one.
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SU Yi,WANG Yang,XIONG Zhong-qi,HAN Yu. Research on Volume Determination Method of Double Weighing in Air. Acta Metrologica Sinica, 2020, 41(12): 1500-1504.
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2020, Vol. 41 
