圧電多層構造超音波トランスジューサの解析

概要

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In this paper, the multilayer piezoelectric tranducer is analized from the view point of the effective attenuation, and the calculation is carried out with the form of electro-acoustic impedance because of the uniform electric displacement.　It is found that the multilayer transducer is useful at high frequency; the effective attenuation of the transducer is decreased and specific frequency bandwidth is increased, as far as high frequency.　We propose a criterion (A^2)/(Z_d) showing the performance of transducer and relating to the effective attenuation, where A and Z_d are the force factor and the damped impedance at the resonant frequency of the transducer respectively.　Lastly, the tranducer performances of various transducer are discussed by using this criterion, and it is shown that the transducer consisting of the stacked λ_0/2 - layeres of CdS gives an improvement of the effective attenuation at the cost of frequency bandwidth.
山形大学の論文
1969-03-20