A NEW METHOD FOR DYNAMIC FORCE MEASUREMENT AT NIM

Meng Feng, Zhang Yue, Zhang Zhimin, Sun Qiao

Abstract

The paper describes a new method for dynamic force measurement at NIM. National institute of Metrology has established fall hammer type1MN dynamic force standard equipment. According to Newton’s law, the dynamic force acting on the force transducer is traceable to mass and acceleration by F = m · a, where m is the mass of hammer and a is the impact acceleration of hammer. Original we measure the impact acceleration of drop hammer by a standard accelerometer. Now we measure the acceleration by a laser Interferometer. Traceability for force is realized via the measurement of acceleration with laser- Doppler-interferometers and the determination of the dropping masses. This paper introduces the structure and the working principle of the equipment, performance parameters and the uncertainty evaluation. This paper also compares the data between the accelerometer and laser-Dopplerinterferometer.

Keywords

dynamic force calibration, laser-Dopplerinterferometer, standard machine

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IMEKO-TC3-2010-002.pdf

DOI

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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