Low-Frequency Magnetic Sensing Using Magnetically Modulated Microcavity Resonant Mode
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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2025-03-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/16/4/405 |
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| author | Xinrong Yang Jiamin Rong Enbo Xing Jianglong Li Yujie Zhang Yanru Zhou Wenyao Liu Huanfei Wen Jun Tang Jun Liu |
| author_facet | Xinrong Yang Jiamin Rong Enbo Xing Jianglong Li Yujie Zhang Yanru Zhou Wenyao Liu Huanfei Wen Jun Tang Jun Liu |
| author_sort | Xinrong Yang |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-5e8ce4a1bde04d8fbe4d72b48b80093f |
| institution | OA Journals |
| issn | 2072-666X |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj-art-5e8ce4a1bde04d8fbe4d72b48b80093f2025-08-20T02:18:04ZengMDPI AGMicromachines2072-666X2025-03-0116440510.3390/mi16040405Low-Frequency Magnetic Sensing Using Magnetically Modulated Microcavity Resonant ModeXinrong Yang0Jiamin Rong1Enbo Xing2Jianglong Li3Yujie Zhang4Yanru Zhou5Wenyao Liu6Huanfei Wen7Jun Tang8Jun Liu9Key Laboratory of Dynamic Testing Technology, School of Instrument and Electronics, North University of China, Taiyuan 030051, ChinaKey Laboratory of Widegap Semiconductor Optoelectronic Materials and Technologies, School of Semiconductors and Physics, North University of China, Taiyuan 030051, ChinaKey Laboratory of Dynamic Testing Technology, School of Instrument and Electronics, North University of China, Taiyuan 030051, ChinaKey Laboratory of Dynamic Testing Technology, School of Instrument and Electronics, North University of China, Taiyuan 030051, ChinaKey Laboratory of Widegap Semiconductor Optoelectronic Materials and Technologies, School of Semiconductors and Physics, North University of China, Taiyuan 030051, ChinaKey Laboratory of Dynamic Testing Technology, School of Instrument and Electronics, North University of China, Taiyuan 030051, ChinaKey Laboratory of Dynamic Testing Technology, School of Instrument and Electronics, North University of China, Taiyuan 030051, ChinaKey Laboratory of Dynamic Testing Technology, School of Instrument and Electronics, North University of China, Taiyuan 030051, ChinaKey Laboratory of Widegap Semiconductor Optoelectronic Materials and Technologies, School of Semiconductors and Physics, North University of China, Taiyuan 030051, ChinaKey Laboratory of Dynamic Testing Technology, School of Instrument and Electronics, North University of China, Taiyuan 030051, ChinaWe 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.https://www.mdpi.com/2072-666X/16/4/405whispering gallery modemicrocavitylow-frequency magnetic sensingresonant mode |
| spellingShingle | Xinrong Yang Jiamin Rong Enbo Xing Jianglong Li Yujie Zhang Yanru Zhou Wenyao Liu Huanfei Wen Jun Tang Jun Liu Low-Frequency Magnetic Sensing Using Magnetically Modulated Microcavity Resonant Mode Micromachines whispering gallery mode microcavity low-frequency magnetic sensing resonant mode |
| title | Low-Frequency Magnetic Sensing Using Magnetically Modulated Microcavity Resonant Mode |
| title_full | Low-Frequency Magnetic Sensing Using Magnetically Modulated Microcavity Resonant Mode |
| title_fullStr | Low-Frequency Magnetic Sensing Using Magnetically Modulated Microcavity Resonant Mode |
| title_full_unstemmed | Low-Frequency Magnetic Sensing Using Magnetically Modulated Microcavity Resonant Mode |
| title_short | Low-Frequency Magnetic Sensing Using Magnetically Modulated Microcavity Resonant Mode |
| title_sort | low frequency magnetic sensing using magnetically modulated microcavity resonant mode |
| topic | whispering gallery mode microcavity low-frequency magnetic sensing resonant mode |
| url | https://www.mdpi.com/2072-666X/16/4/405 |
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