Title :
SAW focusing by circular-arc interdigital transducers on YZ-LiNbO/sub 3/
Author :
Fang, Song Ru ; Zhang, Shu Yi ; Lu, Zheng Feng
Author_Institution :
Dept. of Inf. Phys., Nanjing Univ., China
fDate :
3/1/1989 12:00:00 AM
Abstract :
Using the angular spectrum theory and experimental velocity data of surface acoustic waves (SAW) on YZ-LiNbO/sub 3/, the focusing characteristics of a circular-arc interdigital transducer have been demonstrated. The calculated results show that the depth of focus is long and the compressed acoustic beam width is very narrow. The concept of a caustic is shown to be an excellent way of characterizing SAW focusing by a circular-arc interdigital transducer on YZ-LiNbO/sub 3/. Comparison between theoretical and experimental results shows good agreement.<>
Keywords :
lithium compounds; surface acoustic wave devices; ultrasonic transducers; LiNbO/sub 3/; SAW focusing; angular spectrum theory; caustic; circular-arc interdigital transducers; surface acoustic waves; velocity; Acoustic beams; Acoustic devices; Acoustic transducers; Acoustic waves; Anisotropic magnetoresistance; Apertures; Correlators; Laser excitation; Shape; Surface acoustic waves;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
