Title :
Design and implementation of mixed-mode transducers
Author :
Chou, Ching-Hua ; Khuri-Yakub, Butrus T.
Author_Institution :
Edward L. Ginzton Lab., Stanford Univ., CA, USA
fDate :
5/1/1989 12:00:00 AM
Abstract :
In order to design a mixed-mode transducer with high efficiency and broad bandwidth for both longitudinal and shear wave modes, a theory is developed to determine the properties of this transducer with arbitrary acoustic loads at both ends of the piezoelectric element. Several Y-cut lithium niobate (LiNbO/sub 3/) transducers were made on both [110] single-crystal bismuth germanium oxide (Bi/sub 12/GeO/sub 20/) and fused quartz. The piezoelectric plates were attached to indium bonding and later polished to operate in the 100-MHz frequency range. The experimental data of round-trip insertion loss for both longitudinal and shear modes showed an excellent agreement with theoretical predictions.<>
Keywords :
lithium compounds; piezoelectric transducers; 100 MHz; Bi/sub 12/GeO/sub 20/; LiNbO/sub 3/; bandwidth; longitudinal; mixed-mode transducers; piezoelectric element; round-trip insertion loss; shear wave; Acoustic transducers; Acoustic waves; Bandwidth; Bismuth; Bonding; Frequency; Germanium; Indium; Lithium niobate; Piezoelectric transducers;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on