FBG Current Sensing System Based on Giant Magnetostrictive Material

Abstract

The current sensor based on Giant Magnetostrictive Material（GMM）and Fiber Bragg Grating（FBG）has the advantages of optical current sensor.In this paper,a sensor probe is formed by combining FBG and GMM using home-made epoxy glue.The static operation point of sensor is changed by adding a bias magnetic field.Ferrite material with good high-frequency performance is used as magnetism-guided loop to confine and send the magnetic field into the sensor probe.The magnetic field is generated by the alternating current.Then the change of current is turned into the wavelength shift of FBG.Thus the current measurement can be realized through the FBG demodulation system.Static and dynamic responses of the sensor are tested experimentally.The experimental result shows that the proposed method can effectively measure the current.

Keywords

• current sensor;giant magnetostrictive material;fiber Bragg grating