Static and dynamic property experiments of giant magnetostrictive material-fiber Bragg grating magnetic field sensors

Abstract

Nowadays, there are many kinds of magnetic field sensors such as Hall sensor, Gauss meter and so on. But few of them can be used in the small air gaps which size is about millimeter. A thin-slice Giant Magnetostrictive Material-fiber Bragg grating (GMM–FBG) magnetic field sensor was proposed with the size of 14mm×7mm×1.5mm. The FBG was bonded along the GMM slice length orientation, perpendicular to the major magnetostriction orientation, to measure the GMM’s strain caused by external magnetic field. Experiment systems were established to test the GMM–FBG sensor’s static and dynamic properties. The results show that the sensor’s static property is consistent with the theoretical prediction, and the dynamic response is feasible in low frequencies from 1Hz to 20Hz.