Magnetic Field Sensing Based on SPR Optical Fiber Sensor Interacting With Magnetic Fluid

A novel magnetic field sensing system based on surface plasma resonance (SPR) optical fiber sensor and filled with magnetic fluid (MF) is proposed and demonstrated for the first time. In the magnetic field SPR optical fiber sensor, SPR is excited by Ag as metallic material and MF is filled into the...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2019-01, Vol.68 (1), p.234-239
Main Authors: Zhou, Xue, Li, Xuegang, Li, Shuguang, An, Guo-Wen, Cheng, Tonglei
Format: Article
Language:English
Subjects:
Detection
High sensitivity
magnetic field sensing
Magnetic fields
magnetic fluid (MF)
Magnetic fluids
Magnetic resonance
Magnetism
Magnetostriction
optical fiber sensor
Optical fibers
Optical refraction
Optical sensors
Optical variables control
Plasma resonance
refractive index (RI)
Refractivity
Saturation magnetization
Sensitivity enhancement
Sensors
Silver
surface plasma resonance (SPR)
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Summary:A novel magnetic field sensing system based on surface plasma resonance (SPR) optical fiber sensor and filled with magnetic fluid (MF) is proposed and demonstrated for the first time. In the magnetic field SPR optical fiber sensor, SPR is excited by Ag as metallic material and MF is filled into the capillary sealed with epoxy glue, which utilizes the tunable refractive index (RI) of MF, and the transmission spectrum will change with different magnetic field intensities. The magnetic-optic effect of MF and the high RI sensitivity of optical fiber SPR sensor are utilized to enhance the sensitivity of the novel magnetic field sensor significantly. In the experiment, the performances of the magnetic field sensing system are tested by applying different measured magnetic fields. The final results indicated that a sensitivity of 303 pm/Gs is achieved. Compared with other optical fiber magnetic field sensors, the advantages of the proposed sensor in this paper are simple structure, small in size, easy to make, low cost, high sensitivity, and anti-interference.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2018.2834222