Fiber-Optic Sagnac Interferometry for Gravity Gradient Measurements

被引：19

作者：

Chen, Yanjun ^{[1
]}

Wang, Wenbo ^{[1
]}

He, Yan ^{[2
]}

Cao, Yuwen ^{[1
]}

Zhu, Lanxin ^{[1
]}

Huang, Huimin ^{[1
]}

Ma, Xiangdong ^{[1
]}

Li, Zhengbin ^{[1
]}

机构：

[1] Peking Univ, Sch Elect, State Key Lab Adv Opt Commun Syst & Networks, Beijing 100871, Peoples R China

[2] Peking Univ, Sch Elect Engn & Comp Sci, Beijing 100871, Peoples R China

来源：

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT | 2023年 / 72卷

基金：

中国国家自然科学基金;

关键词：

Gravity; Sagnac interferometers; Optical interferometry; Optical fibers; Optical fiber polarization; Noise measurement; Frequency modulation; Fiber-optic instrumentation; gravity gradient measurements; gravity gradiometer; Sagnac interferometry; PHASE NOISE; CONSTANT;

D O I：

10.1109/TIM.2022.3229732

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We report a design for gravity gradient measurements based on Sagnac interferometry. A structure with two masses is designed to convert the effect of gravity gradients into rotational motion. Sagnac interferometry based on optical fibers is introduced to probe its rotational motion. The systematic effects are analyzed theoretically and validated by the static observation of an experimental apparatus. In a 37-day record, we achieve a noise level of 5 x 10(-12) rads(-2) Hz(-1/2) under a room temperature environment without any vibration isolation and magnetic shielding devices. The corresponding contribution for the gravity gradient measurement is estimated to 1 x 10(-2) E Hz(-1/2).

引用

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