Laser & Optoelectronics Progress, Volume. 60, Issue 7, 0728003(2023)
Interferometric Optical Microfiber Magnetic Field Sensor Based on Magnetostrictive Rod
An interferometric microfiber magnetic field sensor composed of a microfiber interferometer and a TbDyFe magnetostrictive rod is proposed. The microfiber interferometer was formed by tapering a single-mode fiber and placed in lateral contact with a TbDyFe magnetostrictive rod. Under the action of a magnetic field, the axial strain of the magnetostrictive rod and the microfiber interferometer causes a wavelength shift of the interference spectrum, which forms a wavelength coding fiber magnetic field sensor. The experimental results show that for the microfiber interferometers with the same strain characteristics, the smaller the diameter of the magnetostrictive rod is, the higher the magnetic field sensitivity is. The sensitivity of the fiber magnetic field sensor composed of TbDyFe magnetostrictive rod with a diameter of 2 mm can reach up to 0.178 nm/mT. The sensor has the advantages of simple structure, easy fabrication, low cost, and fast response. It can realize highly sensitive detection of weak magnetic field.
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Lingyan Jia, Lili Liang, Fei Xie, Zhida Wang, Chen Wang, Ao Wang, Guoyu Li, Yan Li, Mingsheng Liu. Interferometric Optical Microfiber Magnetic Field Sensor Based on Magnetostrictive Rod[J]. Laser & Optoelectronics Progress, 2023, 60(7): 0728003
Category: Remote Sensing and Sensors
Received: Feb. 4, 2022
Accepted: Mar. 29, 2022
Published Online: May. 24, 2023
The Author Email: Liang Lili (liangli070118@163.com), Li Yan (hdxy0310@163.com)