Performance improvement of the SAW based current sensor incorporating a patterned magnetostrictive FeCo film

摘要

Recently, the idea of Surface acoustic wave (SAW) current sensor utilizing magnetostrictive effect provides a new effective way for sensing current, which exhibits some superior features as fast response, simple structure, and strong anti-jamming. The representative sensor structure is composed of a configuration of dual-delay-line oscillators, and a magnetostrictive film (FeCo) coated onto the sensing device (Fig. 1). Some meaningful results were reported in recent articles. However, due to the strong hysteresis effect of the magnetostrictive material, there occurs obvious asymmetry in sensor response at forward and negative current. To suppress such phenomenon, a patterned design on magnetostrictive coating was performed in this contribution.