Measuring and testing – Vibration – By mechanical waves
Patent
1986-08-05
1987-07-14
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
350330, G01N 2900
Patent
active
046794360
ABSTRACT:
There is disclosed herein an apparatus and method for producing a substantially uniform acoustic field for use with a liquid crystal cell to produce a substantially artifact-free image of an object. The apparatus and method include moving an ultrasonic transducer toward and away from an object, a distance effective to cause adjacent constructive and destructive zone patterns to in effect overlie each other. The period of reciprocation is less than the time for onset of image decay, but greater than the image rise time so as to assure image formation. In addition, the frequency and/or phase of the acoustic energy can be varied so as to further enhance the image.
Electro-mechanical and piston driven embodiments are disclosed for reciprocating the transducer.
REFERENCES:
patent: 3831434 (1974-08-01), Greguss
patent: 4338821 (1982-07-01), Dion
patent: 4379408 (1983-04-01), Sandhu
patent: 4393712 (1983-07-01), Sandhu
patent: 4506550 (1985-03-01), Sandhu
patent: 4530242 (1985-07-01), Sandhu
P. N. T. Wells, Physical Principles of Ultrasonic Diagnosis, Academic Press, 1969, p. 54.
G. L. Gooberman, Ultrasonics Theory and Application, English University Press Printing, 1968, p. 34.
Birmiel Howard A.
Raj Technology, Inc.
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