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Research on Magnetoelectric Effect of Array Transducer Using Terfenol-D/PZT and Elastic Substrate

Author: ZhangYaFei
Tutor: LiPing
School: Chongqing University
Course: Instrument Science and Technology
Keywords: Magnetoelectric effect Magnetostrictive materials Piezoelectric material Array
CLC: TN712
Type: Master's thesis
Year: 2009
Downloads: 65
Quote: 0
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Abstract


The magnetoelectric composites can achieve mutual conversion between magnetic energy and energy can be applied magnetic field detection, microwave leakage monitoring, electromagnetic field energy conversion and other fields. And of particles mixed structure compared to the laminated structure has a higher magnetic voltage coefficient, this group proposed massive magnetostrictive material and piezoelectric material composite elastic substrate to form a three phase magnetic elastic substrate the electric array structure, compared to the two-phase magnetoelectric composite magnetostrictive material and piezoelectric material laminated structure in resonance with the array structure with higher magnetoelectric voltage conversion factor. For this array structure, the main research work as follows: ① through theoretical analysis of the forced vibration characteristics of the array transducer in the alternating magnetic field, the introduction of the elastic substrate of the array to change the resonant frequency of the energy converter, in considering the case of the loss The next wave propagation in the medium when the superimposition. Magnetic - machine effect experiments, the use of Doppler vibrometer testing Terfenol-D block paste to elastic substrate surface before and after the vibration speed and compared. Using the piezoelectric sheets PZT-8 inverse piezoelectric effect, and were tested using the Doppler vibrometer the piezoelectric sheets PZT-8 and pasted to the surface of the elastic substrate in the free state after the main mode vibration changes. ② use the multi-piece of Terfenol-D, the piezoelectric sheets PZT-8 fine wavelength disposed on the elastic substrate, constituting the array structure. Under the joint action of the biasing magnetic field and periodic alternating magnetic field, when the entire structure of resonance occurs, using the principle of superposition of the wave, so that the piezoelectric sheets received on the strongest stress, and ultimately improve the magnetic power of the transducer at a high frequency voltage conversion factor, and the output electric power. ③ through Terfenol-D/PZT-8 / elastic substrate array laminated test sample, describes the preparation method of the laminated material. Build the magnetic - machine effect of the experimental system, magnetic - electrical effect of the experimental system, described the selection of the various experimental components and design ideas. The dynamic testing method for performance testing, the sample was prepared in the laboratory test apparatus, the electrical characteristics of various magnetic samples tested. Experimental studies show that 800Oe the bias magnetic field and the peak - to 1OE alternating magnetic field at the resonance point 392KHz transducer array structure the maximum magnetic electrically coupled voltage coefficient, and the maximum output power reached the 235.5 mV / Oe and 2.403uW, compared to the MP laminated structure transducer, 13.77% and 33.7%, respectively.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Variable energy converter
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