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

doi:10.1088/1674-1056/26/9/090401

中国物理B ›› 2017, Vol. 26 ›› Issue (9): 90401-090401.doi: 10.1088/1674-1056/26/9/090401

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

Wen-Ze Zhan(占文泽), Jie Luo(罗杰), Cheng-Gang Shao(邵成刚), Di Zheng(郑第), Wei-Ming Yin(殷蔚明), Dian-Hong Wang(王典洪)

1 School of Mechanical Engineering and Electronic Information, China University of Geosciences, Wuhan 430074, China;
2 MOE Key Laboratory of Fundamental Physical Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China;
3 Wuhan Juzheng Environmental Science & Technology Co., Ltd, Wuhan 430074, China

收稿日期:2017-04-05 修回日期:2017-05-18 出版日期:2017-09-05 发布日期:2017-09-05
通讯作者: Jie Luo, Cheng-Gang Shao E-mail:luojiethanks@126.com;cgshao@mail.hust.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11575160 and 11275075) and the Natural Science Foundation of Key Projects of Hubei Province, China (Grant No. 2013CFA045).

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

Wen-Ze Zhan(占文泽)¹, Jie Luo(罗杰)¹, Cheng-Gang Shao(邵成刚)², Di Zheng(郑第)³, Wei-Ming Yin(殷蔚明)¹, Dian-Hong Wang(王典洪)¹

1 School of Mechanical Engineering and Electronic Information, China University of Geosciences, Wuhan 430074, China;
2 MOE Key Laboratory of Fundamental Physical Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China;
3 Wuhan Juzheng Environmental Science & Technology Co., Ltd, Wuhan 430074, China

Received:2017-04-05 Revised:2017-05-18 Online:2017-09-05 Published:2017-09-05
Contact: Jie Luo, Cheng-Gang Shao E-mail:luojiethanks@126.com;cgshao@mail.hust.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11575160 and 11275075) and the Natural Science Foundation of Key Projects of Hubei Province, China (Grant No. 2013CFA045).

摘要/Abstract

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.

关键词: weak equivalence principle, torsion pendulum, thermal noise limit, internal damping

Abstract: 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.

Key words: weak equivalence principle, torsion pendulum, thermal noise limit, internal damping

中图分类号: (Experimental tests of gravitational theories)

04.80.Cc

占文泽, 罗杰, 邵成刚, 郑第, 殷蔚明, 王典洪. Determination of the thermal noise limit in test of weak equivalence principle with a rotating torsion pendulum[J]. 中国物理B, 2017, 26(9): 90401-090401.

Wen-Ze Zhan(占文泽), Jie Luo(罗杰), Cheng-Gang Shao(邵成刚), Di Zheng(郑第), Wei-Ming Yin(殷蔚明), Dian-Hong Wang(王典洪). Determination of the thermal noise limit in test of weak equivalence principle with a rotating torsion pendulum[J]. Chin. Phys. B, 2017, 26(9): 90401-090401.

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

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

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