多孔質PZTを用いた低周波用送受波器
1993 年 20 巻 2 号 p. 92-94
詳細
1993 年 20 巻 2 号 p. 92-94
Porous Pb (Zr, Ti) O3 (P-PZT), characterizing a large g33 constant, low acoustic impedance (Zo) and low Q compared with conventional (nonporous) PZT, is applied to the transducer of the resonance frequency of 50kHz. Because the frequency is adjusted in the thickness mode, the resonance impedance of the P-PZT transducer becomes high. The impedance is lowered by the transformer composed in the transducer. The characteristics of the P-PZT transducer evaluated in water show a lower Q, wider frequency band width and shorter rise/fall time of the acoustic response than the non porous PZT transducer.
