Direct measurement of the anelasticity of a tungsten fiber
- Department of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China)
We report the first precision measurement of the frequency-dependent property of the effective torsion spring constant for a tungsten fiber by using two disk pendulums with different moments of inertia. A quartz fiber with Q{approx_equal}3.36x10{sup 5} was used to determine the ratio of the moments of inertia of two pendulums. The experimental result indicated that the torsion spring constant of the tungsten fiber was dependent on the oscillation frequency by {delta}K/{delta}({omega}{sup 2})=(0.954{+-}0.084)x10{sup -8} kgm{sup 2} at {approx}mHz range, which suggested that the resultant bias in our G measurement with the time-of-swing method was {delta}G/G=(211.80{+-}18.69) ppm as reported recently by Jun Luo et al.[Phys. Rev. Lett. 102, 240801 (2009)]. This experiment provided the first direct test to the Kuroda-Newman effect that predicted an upward bias in a G measurement with the time-of-swing method.
- OSTI ID:
- 21313535
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 80, Issue 12; Other Information: DOI: 10.1103/PhysRevD.80.122005; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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