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Active Magnetic-Field Stabilization with Atomic Magnetometer

Authors :
Rui Zhang
Yudong Ding
Yucheng Yang
Zhaoyu Zheng
Jingbiao Chen
Xiang Peng
Teng Wu
Hong Guo
Source :
Sensors, Vol 20, Iss 15, p 4241 (2020)
Publication Year :
2020
Publisher :
MDPI AG, 2020.

Abstract

A magnetically-quiet environment is important for detecting faint magnetic-field signals or nonmagnetic spin-dependent interactions. Passive magnetic shielding using layers of large magnetic-permeability materials is widely used to reduce the magnetic-field noise. The magnetic-field noise can also be actively monitored with magnetometers and then compensated, acting as a complementary method to the passive shielding. We present here a general model to quantitatively depict and optimize the performance of active magnetic-field stabilization and experimentally verify our model using optically-pumped atomic magnetometers. We experimentally demonstrate a magnetic-field noise rejection ratio of larger than ∼800 at low frequencies and an environment with a magnetic-field noise floor of ∼40 fT/Hz1/2 in unshielded Earth’s field. The proposed model provides a general guidance on analyzing and improving the performance of active magnetic-field stabilization with magnetometers. This work offers the possibility of sensitive detections of magnetic-field signals in a variety of unshielded natural environments.

Details

Language :
English
ISSN :
14248220
Volume :
20
Issue :
15
Database :
Directory of Open Access Journals
Journal :
Sensors
Publication Type :
Academic Journal
Accession number :
edsdoj.b95c29492b5d44a68b240ebc64be42e5
Document Type :
article
Full Text :
https://doi.org/10.3390/s20154241