Research On Magnetoelectric Effect Of Array Transducer Using Terfenol-D/PZT And Elastic Substrate

Magnetoelectric composites can interconvert energies between magnetic field and electric field, and can be applied in magnetic field detection, microwave leak monitoring and electromagnetic field energy conversion. The laminate composites have higher magnetoelectric voltage coefficients than the particle composites. The magnetoelectric array structure composite of three phases by bonding the laminated magnetostrictive and piezoelectric materials onto an elastic substrate has been proposed by our research group. Compared with the two-phase magnetostrictive-piezoelectric laminate composite, it has higher magnetoelectric voltage coefficient at resonance. In this paper, the magnetoelectric performances of array structure transducer are studied by theory and experiments. The main work is as follows:①This article analyzes the forced vibration characteristic of array transducer structure under an exciting magnetic field with a peak-peak value of 1Oe and a bias field of 800Oe, the influence of elastic substrate on the resonance frequency of the array transducer structure, and the superposition of waves considering dissipation. We also measure the variation of vibration velocity of Terfenol-D and the variation of main modality of PZT-8 before and after affixed to the elastic substrate using polytec vibrometer controller, respectively.②Affixing Terfenol-D and PZT-8 on the elastic substrate with the same wavelength to make a array transducer, superposition of waves will intensify the stresses impact on the PZT-8 at resonance frequency under an exciting magnetic field of peak-peak value 1Oe superimposed with a bias field of 800Oe, increasing the ME voltage coefficient and the output electrical power of the transducer at high frequency.③To verify the theoretical results, Magneto-Mechanical (MM) response measure system and ME response measure system are built up. The making procedure of Terfenol-D/PZT-8/elastic substrate array sample is introduced, and the MM performances and ME performances of array structure transducer are measured by the dynamic testing method. The experimental results indicate, the maximum ME voltage coefficient achieves 235.5mV/Oe at resonance frequency under an exciting magnetic field of 1Oe superimposed with a bias field of 800Oe, and the maximum electrical power of the array structure transducer reaches 2.403uW at resonance frequency 392KHz, increasing 13.77% and 33.7% relative to MP laminate structure transducer, respectively.