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Sensors 2016, 16(5), 620; doi:10.3390/s16050620

A Magnetic Field Sensor Based on a Magnetic Fluid-Filled FP-FBG Structure

1
Academy of Ocean Science and Engineering & College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
2
College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 3 March 2016 / Revised: 18 April 2016 / Accepted: 21 April 2016 / Published: 29 April 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [2564 KB, uploaded 29 April 2016]   |  

Abstract

Based on the characteristic magnetic-controlled refractive index property, in this paper, a magnetic fluid is used as a sensitive medium to detect the magnetic field in the fiber optic Fabry-Perot (FP) cavity. The temperature compensation in fiber Fabry-Perot magnetic sensor is demonstrated and achieved. The refractive index of the magnetic fluid varies with the applied magnetic field and external temperature, and a cross-sensitivity effect of the temperature and magnetic field occurs in the Fabry-Perot magnetic sensor and the accuracy of magnetic field measurements is affected by the thermal effect. In order to overcome this problem, we propose a modified sensor structure. With a fiber Bragg grating (FBG) written in the insert fiber end of the Fabry-Perot cavity, the FBG acts as a temperature compensation unit for the magnetic field measurement and it provides an effective solution to the cross-sensitivity effect. The experimental results show that the sensitivity of magnetic field detection improves from 0.23 nm/mT to 0.53 nm/mT, and the magnetic field measurement resolution finally reaches 37.7 T. The temperature-compensated FP-FBG magnetic sensor has obvious advantages of small volume and high sensitivity, and it has a good prospect in applications in the power industry and national defense technology areas. View Full-Text
Keywords: magnetic field sensor; Fabry-Perot Cavity; magnetic fluid; Fiber Bragg Grating; temperature compensation magnetic field sensor; Fabry-Perot Cavity; magnetic fluid; Fiber Bragg Grating; temperature compensation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Xia, J.; Wang, F.; Luo, H.; Wang, Q.; Xiong, S. A Magnetic Field Sensor Based on a Magnetic Fluid-Filled FP-FBG Structure. Sensors 2016, 16, 620.

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