Smart Hybrid Sensor For Magnetic Field And Vibration Detection Based On Pmn-Pt/Terfenol-D Magnetoelectric Composites And Suspended Magnetic Vibrator

A smart hybrid sensor for magnetic field and vibration detection is presented. We propose a novel structure of the hybrid sensor consisting of two longitudinally magnetized and thickness polarized mode (L-T mode) Terfenol-D alloy 0.7Pb(Mg1/3Nb2/3)O-3-0.3PbTiO(3) single crystal (PMN-PT) magnetoelectric laminate composites and a suspended magnetic vibrator which can convert external vibration to internal alternating magnetic field. The hybrid sensor exhibits a giant vibration responsivity of 12 V/g at 400 Hz and a useful magnetic field responsivity of 6 mV/mu T at 23 Hz. The detection limit for AC acceleration and magnetic field is as low as 8.16 ng/Hz(1/2) at 400 Hz and 16.4 pT/Hz(1/2) at 23 Hz, respectively. The sensor output shows linear response with low distortion both to AC acceleration and magnetic field. In the end, the sensor's capability for detection of magnetic and non-magnetic moving target has been proven to be useful in intelligent transportation by an outdoor (open) test. (C) 2021 Elsevier B.V. All rights reserved.