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.
Highlights
Current intensity has been considered as one of the most significant parameters in electrical, chemical and physical fields
The transmission spectrum of the interference has a red-shift with the magnetic field increase
An optical fiber F-P current sensor integrated with magnetic fluid (MF) using a Fiber Bragg grating (FBG) demodulation was proposed
Summary
Current intensity has been considered as one of the most significant parameters in electrical, chemical and physical fields. Fiber optical current sensors have attracted much attention in recent years on account of their many merits such as safety, and low weight when compared with traditional current sensors [1,2]. Since current cannot be directly measured just by an optical fiber, one kind of common measuring method is to measure the magnetic field that the current generates indirectly, for example, through. MF does not retain magnetization in the absence of an external field. It will become highly magnetized in the presence of a magnetic field. As a magneto-optical nano-material, MF has attracted much research interest owing to its distinguished magneto-optical properties such as tunable refractive index [3], Faraday Effect [4], field dependent transmittance [5] and birefringence [6]. Various optical fiber sensors based on MF have been proposed such as optical fiber
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