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Influence of tungsten fiber’s slow drift on the measurement of G with angular acceleration method

发布时间:2016-12-09          来源:办公室           浏览次数:

Jie Luo,1 Wei-Huang Wu,1 Chao Xue,2,3 Cheng-Gang Shao,2Wen-Ze Zhan,1 Jun-Fei Wu,2 and Vadim Milyukov4

1School of Mechanical Engineering and Electronic Information, China University of Geosciences, Wuhan 430074, People’s Republic of China

2MOE Key Laboratory of Fundamental Physical Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China

3School of Physics and Astronomy, Sun Yat-sen University, Guangzhou 510275, People’s Republic of China 4Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow 119992, Russia

(Received 9 May 2016; accepted 22 July 2016; published online 10 August 2016)

In the measurement of the gravitational constant G with angular acceleration method, the equilibrium position of torsion pendulum with tungsten fiber undergoes a linear slow drift, which results in a quadratic slow drift on the angular velocity of the torsion balance turntable under feedback control unit. The accurate amplitude determination of the useful angular acceleration signal with known frequency is biased by the linear slow drift and the coupling effect of the drifting equilibrium position and the room fixed gravitational background signal. We calculate the influences of the linear slow drift and the complex coupling effect on the value of G, respectively. The result shows that the bias of the linear slow drift on G is 7 ppm, and the influence of the coupling effect is less than 1 ppm. Published by AIP Publishing. [http://dx.doi.org/10.1063/1.4960398]

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