Vector magnetic field measurement based on fiber ring microwave photonic filter with the Vernier effect

被引：0
|
作者：
Feng, Danqi [1 ]
Lei, Run [1 ]
Liu, Yuwei [1 ]
Wang, Haiyang [1 ]
Deng, Ming [1 ]
机构：
[1] Key Laboratory of Optoelectronic Technology & Systems (Education Ministry of China), Chongqing University, Chongqing,400044, China
来源：
Optics and Laser Technology | 2025年 / 181卷
关键词：
Magnetic field measurement;
D O I：
10.1016/j.optlastec.2024.111767
中图分类号：
学科分类号：
摘要：
A vector magnetic field sensor based on enhanced Vernier effect is experimentally demonstrated. The Vernier effect is generated from two microwave photonic filters (MPFs) with close free spectral range (FSR), which is constructed by the fiber ring (FR) and the optical carrier microwave interferometry (OCMI). Linear chirped fiber Bragg grating (LCFBG) is inserted in the FR to act as the dispersion element to provide time delay. By attaching the fiber Bragg grating (FBG) on the magnetostrictive material (MA), the magnetic field can be transferred into the wavelength shift, as well as the time delay of the FR and the frequency response of the FR-MPF. By choosing opposite dispersion of LCFBGs and closer FSRs, cascaded FR-MPFs based sensor can greatly improve the sensitivity. The sensitivities for the magnetic field intensity and direction are 127.71 kHz/Oe, the magnification factor of which is 432, and 418.16 kHz/deg. The proposed scheme has merits of high sensitivity and interference immunity, which is suitable for high precision measurement. © 2024 Elsevier Ltd
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