title: Influence of temperature on period of torsion pendulum with a high-Q fused silica fiber.
abstract: Due to the high-Q fused silica fiber's extreme sensitivity to temperature change, the period estimation of torsion pendulum with high precision depends on the effective correction of the thermoelastic effect. In the measurement of G with the time-of-swing method, we analyze the complex relation between temperature and the pendulum's period and propose a developed method to find the shear thermoelasticity coefficient as well as isolate the influence of temperature on period alone. The result shows that the shear thermoelasticity coefficient is 101(2) × 10(-6)/°C, the resultant correction to Δ(ω(2)) is 9.16(0.18) ppm, and the relative uncertainty to G is less than 1 ppm.
authors.affiliation: Faculty of Mechanical and Electronic Information, China University of Geosciences, Wuhan 430074, People's Republic of China.
authors.forename: Jie
authors.initials: J
authors.lastname: Luo
authors.affiliation: Faculty of Mechanical and Electronic Information, China University of Geosciences, Wuhan 430074, People's Republic of China.
authors.forename: Wei-Huang
authors.initials: WH
authors.lastname: Wu
authors.affiliation: School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
authors.forename: Cheng-Gang
authors.initials: CG
authors.lastname: Shao
authors.affiliation: School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Li
authors.affiliation: School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
authors.forename: Jian-Ping
authors.initials: JP
authors.lastname: Liu
authors.affiliation: Faculty of Mechanical and Electronic Information, China University of Geosciences, Wuhan 430074, People's Republic of China.
authors.forename: Wen-Ze
authors.initials: WZ
authors.lastname: Zhan
authors.affiliation: Faculty of Mechanical and Electronic Information, China University of Geosciences, Wuhan 430074, People's Republic of China.
authors.forename: Dian-Hong
authors.initials: DH
authors.lastname: Wang