title: Influence of tungsten fiber's slow drift on the measurement of G with angular acceleration method.
abstract: 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.
authors: School of Mechanical Engineering and Electronic Information, China University of Geosciences, Wuhan 430074, People's Republic of China.
authors: Jie
authors: J
authors: Luo
authors: School of Mechanical Engineering and Electronic Information, China University of Geosciences, Wuhan 430074, People's Republic of China.
authors: Wei-Huang
authors: WH
authors: Wu
authors: MOE Key Laboratory of Fundamental Physical Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
authors: Chao
authors: C
authors: Xue
authors: MOE Key Laboratory of Fundamental Physical Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
authors: Cheng-Gang
authors: CG
authors: Shao
authors: School of Mechanical Engineering and Electronic Information, China University of Geosciences, Wuhan 430074, People's Republic of China.
authors: Wen-Ze
authors: WZ
authors: Zhan
authors: MOE Key Laboratory of Fundamental Physical Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
authors: Jun-Fei
authors: JF
authors: Wu
authors: Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow 119992, Russia.
authors: Vadim
authors: V
authors: Milyukov