Transducer

Details Transducer Transducer

1992-12-08

1994-05-03

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Signal transducers

367150, 367151, 367157, 310325, 310334, 310335, 310336, H04R 1700

Patent

active

053094115

ABSTRACT:
A transducer apparatus and method for generating sonic sound waves having a far field wavefront amplitude pattern in a Bessel or Gaussian distribution is disclosed. The transducer includes a piezoelectric element having uniformly poled dipoles formed therein. An unpoled backing body having the same dielecctric constant as the piezoelectric element contacts and is attached to the piezoelectric element. An indentation shaped to produce a beam amplitude distribution of a predetermined function is formed on the backing body.

REFERENCES:
patent: 4296349 (1981-10-01), Nakanishi et al.
patent: 5212671 (1993-05-01), Fajii et al.
Du et al., "The Ultrasonic Field of a Gaussian Transducer," J. Acoust. Soc. Am. 78 (6):2083-2086 (1985).
Aanonsen et al., "Distortion and Harmonic Generation in the Nearfielddl of a Finite Amplitude Sound Beam," J. Acoust. Soc. Am. 75 (3):749-768 (1984).
Du et al., "An Ultrasonic Gaussian Transducer With a Curved Back Electrode," J. Acoust., Soc. Am. 89 (3): 1443-1447 (1991).
Hsu et al., "Ultrasonic Beams with Bessel and Gaussian Profiles" Review of Progress in Quantiative Nondestructive Evaluation 9:799-806, Plenun Press, N.Y. (1990).
Martin et al., "A Simple Way to Eliminate Diffraction Lobes Emitted by Ultrasonic Transducers," J. Acoust. Soc. Am. 49:1668-1669 (1971).

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