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Sensors 2015, 15(7), 16632-16641; doi:10.3390/s150716632

Fiber Optic Fabry-Perot Current Sensor Integrated with Magnetic Fluid Using a Fiber Bragg Grating Demodulation

1,†
,
2,3,†,* , 2
and
1
1
Academy of Ocean Science and Engineering, National University of Defense Technology, Changsha 410073, China
2
College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
3
State Key Laboratory of Synthetical Automation for Process Industries, Northeastern University, Shenyang 110819, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 25 May 2015 / Revised: 6 July 2015 / Accepted: 6 July 2015 / Published: 9 July 2015
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [1232 KB, uploaded 9 July 2015]   |  

Abstract

An optical fiber current sensor based on Fabry-Perot interferometer using a fiber Bragg grating demodulation is proposed. Magnetic fluid is used as a sensitive medium in fiber optical Fabry-Perot (F-P) cavity for the optical characteristic of magnetic-controlled refractive index. A Fiber Bragg grating (FBG) is connected after the F-P interferometer which is used to reflect the optical power at the Bragg wavelength of the interference transmission spectrum. The corresponding reflective power of the FBG will change with different external current intensity, due to the shift on the interference spectrum of the F-P interferometer. The sensing probe has the advantages of convenient measurement for its demodulation, low cost and high current measurement accuracy on account of its sensing structure. Experimental results show that an optimal sensitivity of 0.8522 nw/A and measurement resolution of 0.001 A is obtained with a FBG at 1550 nm with 99% reflectivity. View Full-Text
Keywords: fiber Bragg grating; capillary encapsulating; fiber optic Fabry-Perot sensor; fiber current intensity sensor; light intensity demodulation fiber Bragg grating; capillary encapsulating; fiber optic Fabry-Perot sensor; fiber current intensity sensor; light intensity demodulation
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, Q.; Liu, X.; Luo, H. Fiber Optic Fabry-Perot Current Sensor Integrated with Magnetic Fluid Using a Fiber Bragg Grating Demodulation. Sensors 2015, 15, 16632-16641.

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