title: Fiber Optic Fabry-Perot Current Sensor Integrated with Magnetic Fluid Using a Fiber Bragg Grating Demodulation.
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.
authors.affiliation: Academy of Ocean Science and Engineering, National University of Defense Technology, Changsha 410073, China. blovexiaji@163.com.
authors.forename: Ji
authors.initials: J
authors.lastname: Xia
authors.affiliation: College of Information Science and Engineering, Northeastern University, Shenyang 110819, China. wangqi@ise.neu.edu.cn.|State Key Laboratory of Synthetical Automation for Process Industries, Northeastern University, Shenyang 110819, China. wangqi@ise.neu.edu.cn.
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
authors.affiliation: College of Information Science and Engineering, Northeastern University, Shenyang 110819, China. neuliuxu@gmail.com.
authors.forename: Xu
authors.initials: X
authors.lastname: Liu
authors.affiliation: Academy of Ocean Science and Engineering, National University of Defense Technology, Changsha 410073, China. luohongrong2000@163.com.
authors.forename: Hong
authors.initials: H
authors.lastname: Luo
keywords: capillary encapsulating; fiber Bragg grating; fiber current intensity sensor; fiber optic Fabry-Perot sensor; light intensity demodulation