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《Acta Metrologica Sinica》 2007-03
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Measurement Methods for the Outer Diameter of Bell Type Prover of Gas Flowmeter Standard

WANG Chi,CUI Li-shui(Division of Thermometry and Materials Evaluation,National Institute of Metrology,Beijing 100013,China)  
In the geometric method it is most important to measure outer the diameter of the bell type prover gas flow standard facility,so the main problem is to analyze the uncertainty.For the bell type prover that volume is 100 litre,three different methods including π ruler method,laser tracker method and micrometer method are applied to measure the outer diameter of the bell type prover.The outer diameter in different sections of the bell type prover is measured.The results were compared and analized,and the method are coherent.The research shows that all of these methods are proper.Through the analysis of the data,the π ruler method is more exact for the bell type prover produced in China.
【CateGory Index】: TH814
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