利用磁调制微腔共振模式的低频磁传感

Low-Frequency Magnetic Sensing Using Magnetically Modulated Microcavity Resonant Mode.

作者信息

Yang Xinrong, Rong Jiamin, Xing Enbo, Li Jianglong, Zhang Yujie, Zhou Yanru, Liu Wenyao, Wen Huanfei, Tang Jun, Liu Jun

机构信息

Key Laboratory of Dynamic Testing Technology, School of Instrument and Electronics, North University of China, Taiyuan 030051, China.

Key Laboratory of Widegap Semiconductor Optoelectronic Materials and Technologies, School of Semiconductors and Physics, North University of China, Taiyuan 030051, China.

出版信息

Micromachines (Basel). 2025 Mar 29;16(4):405. doi: 10.3390/mi16040405.

DOI:10.3390/mi16040405

PMID:40283281

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12029851/

Abstract

We propose a low-frequency magnetic sensing method using a magnetically modulated microcavity resonant mode. Our magnetically sensitive unit with periodically changing magnetic poles is formed by combining an AC excitation coil with a microcavity. The microcavity vibrates at the frequency of the AC amplitude-modulated signal and changes its resonant mode when the sensing unit interacts with a low-frequency magnetic field. Signal processing is performed on the resonant spectrum to obtain low-frequency magnetic signals. The results of the experiment show that the measured sensitivity to a 0.5 Hz magnetic field is 12.49 V/mT, and a bias instability noise of 16.71 nT is achieved. We have extended the measurable frequency range of the whispering gallery mode microcavity magnetometer and presented a development in microcavity magnetic sensing and optical readout.

摘要

我们提出了一种利用磁调制微腔共振模式的低频磁传感方法。我们的具有周期性变化磁极的磁敏单元是通过将交流激励线圈与微腔相结合而形成的。当传感单元与低频磁场相互作用时，微腔以交流调幅信号的频率振动并改变其共振模式。对共振光谱进行信号处理以获得低频磁信号。实验结果表明，对0.5 Hz磁场的测量灵敏度为12.49 V/mT，实现了16.71 nT的偏置不稳定性噪声。我们扩展了回音壁模式微腔磁力计的可测量频率范围，并展示了微腔磁传感和光学读出方面的进展。