A magnetoelectric transducer consisting of magnetostrictive and piezoelectric composite array

摘要

This paper presents a new high-efficiency ME composite transducer consisting of magnetostrictive Terfenol-D arrays, piezoelectric PZT arrays and a substrate. Magnetostrictive resonant unidirectional transducer (MRUDT) array groups and a piezoelectric unidirectional transducer (PUDT) array group are created inside the transducer while propagating the unidirectionality required for low loss and converting the magnetic signal into resonant acoustoelectric wave with both the higher amplitude and the wider bandwidth. Because of the superimposed effect and the minor loop feedback (the partial resonance) in the MRUDT array, the contradiction between the higher quality (Q) value and the wider bandwidth can be settled and a higher ME voltage coefficients with a wider bandwidth can be obtained by using MRUDT arrays, PUDT array and a Be-bronze substrate with a higher Q value. Experiments and measurement demonstrate that the composite transducer of PUDT, MRUDT and a substrate has a significantly widened bandwidth and an enhanced ME voltage coefficient relative to the prior sandwiched laminate composite configurations.