Determination of the thermal noise limit in test of weak equivalence principle with a rotating torsion pendulum

被引：0

作者：

占文泽 ^{[1
]}

罗杰 ^{[1
]}

邵成刚 ^{[2
]}

郑第 ^{[3
]}

殷蔚明 ^{[1
]}

王典洪 ^{[1
]}

机构：

[1] School of Mechanical Engineering and Electronic Information,China University of Geosciences

[2] MOE Key Laboratory of Fundamental Physical Quantities Measurement School of Physics,Huazhong University of Science and Technology

[3] Wuhan Juzheng Environmental Science & Technology Co. Ltd

来源：

Chinese Physics B | 2017年 / 26卷 / 09期

基金：

中国国家自然科学基金;

关键词：

weak equivalence principle; torsion pendulum; thermal noise limit; internal damping;

D O I：

暂无

中图分类号：

O314 [引力理论];

学科分类号：

080101 ;

摘要：

Thermal noise is one of the most fundamental limits to the sensitivity in weak equivalence principle test with a rotating torsion pendulum. Velocity damping and internal damping are two of many contributions at the thermal noise, and which one mainly limits the torsion pendulum in low frequency is difficult to be verified by experiment. Based on the conventional method of fast Fourier transform, we propose a developed method to determine the thermal noise limit and then obtain the precise power spectrum density of the pendulum motion signal. The experiment result verifies that the thermal noise is mainly contributed by the internal damping in the fiber in the low frequency torsion pendulum experiment with a high vacuum. Quantitative data analysis shows that the basic noise level in the experiment is about one to two times of the theoretical value of internal damping thermal noise.

引用

页码：60 / 65

页数：6