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16 May 2011 Fiber Bragg grating high-current sensor based on magnetic coupling
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Current sensors always play a very important role in the power industry. For example, current sensors can provide the key information for measurement, control and relay protection. However, when the economic further develops and the level of current increases year by year, it is very difficult to meet the demand for current sensors based on conventional technology which is still the main stream. Novel current sensors always are pursued. A research focusing on the current sensor is the technology of fiber optic current sensor, because there is high resistance to electromagnetic interference in fiber optic sensors. Fiber Bragg grating (FBG) sensors have been applied in many fields and have gained great achievements. It is of great help to the current measurement if FBG current sensors are realized. In this paper, a novel FBG high-current sensor is developed based on magnetic coupling. The principle is described, such as the magnetic coupling, the structure of the sensor and the sensing data processing. Experiments are carried out, and the results show at least 60 pm wavelength shift with the change of 100A and 2563 pm wavelength shift when the current is 750A and a good repeatability. The results are in agreement with the principle and indicate that the proposed sensor is capable of measuring both dc and ac current.
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Ciming Zhou, Dongli Wang, Wenju Zhang, Lin Wu, and Yuan Yao "Fiber Bragg grating high-current sensor based on magnetic coupling", Proc. SPIE 8034, Photonic Microdevices/Microstructures for Sensing III, 80340N (16 May 2011);

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