Ultrasonic transducer

Details Ultrasonic transducer Ultrasonic transducer

1993-03-26

1994-09-06

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Signal transducers

367157, 310322, 381150, 381190, H04R 1700

Patent

active

053454278

ABSTRACT:
A phase-insensitive ultrasonic transducer has a zinc oxide single crystal as a piezoelectric semiconducting acoustoelectric element, providing high sensitivity and operable over a range of wavelengths of the ultrasonic waves. The electrical conductivity of said zinc oxide single crystal may be selected in the range 10.sup.-8 to 10.sup.-2 .OMEGA..sup.-1.cm.sup.-1. The single crystal can have an attenuation rate for ultrasonic waves of 10 MHz of at least 0.8 cm.sup.-1.

REFERENCES:
patent: 3240962 (1966-03-01), White
patent: 3671193 (1972-06-01), Jaskolski et al.
patent: 5220893 (1993-06-01), Kibblewhite
Patent Abstracts of Japan, vol. 9, No. 253 (P-395) (1976) Oct. 11, 1985 & JP-A-60-104,223 (Toshiba KK) Jun. 8, 1985.
Database WPIL, Week 8407, Derwent Publications Ltd., London, GB; AN 84-040322 & JP-A-59,003,091 (Tokyo Shibaura Denki KK) Jan. 9, 1984.
Database WPIL, Week 9131, Derwent Publications Ltd., London, GB; NA 91-228528 & SU-A-1,606,541 (Crystallog Inst) Nov. 15, 1990.
E. D. Kolb et al., The Hydrothermal Growth of Low Carrier Concentration ZnO at High Water and Hydrogen Pressures, Mat. Res. Bull. vol. 2, pp. 1099-1106, 1967. Pergamon Press, Inc. Printed in the United States.
Joseph S. Heyman, Phase Insensitive Acoustoelectric Transducer, J. Acoust. Soc. Am., vol. 64, No. 1, Jul. 1978.
Patent Abstract of Japan vol. 9, No. 253 (P-395) (1976), for JP 60-104223.
JP 59-003091 (Derwent An 84-040322).
SU 1606541 (Derwent An 91-228528).

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