Measuring and testing – Vibration – By mechanical waves
Patent
1977-09-14
1979-03-13
Queisser, Richard C.
Measuring and testing
Vibration
By mechanical waves
73620, 73626, 73642, 73644, 128 2V, G01N 7904
Patent
active
041435540
ABSTRACT:
An ultrasonic scanner for producing a sector scan in an object to be examined in which one or more ultrasonic transducers traverse an arcuate path with respect to a reflector which is positioned to receive the ultrasonic waves scanning the surface of the reflector from each of the transducers and converge such waves at a point of a preselected distance in front of the reflector. In general, the ultrasonic waves are converged at a point outside the scanner and inside the object to produce a sector scan in the object having its center at the convergence point. In one embodiment of the scanner the reflector only partially reflects the ultrasonic waves and an additional stationary transducer is provided which is positioned to produce ultrasonic waves which radiate through the reflector and coincide with one of the lines of the sector scan, thus permitting simultaneous M-mode or pulse Doppler echo information to be obtained in perfect registration with the sector scan lines. Attenuation, absorption and anti-reflection means are provided to suppress echo artifacts.
REFERENCES:
patent: 2483821 (1949-10-01), Firestone
patent: 3269173 (1966-08-01), VON Ardenne
patent: 3362501 (1968-01-01), Lenahan
patent: 3687219 (1972-08-01), Langlois
G. Kossoff et al., Ultrasonic Two-Dimensional Visualization for Medical Diagnosis, J.A.S.A., Nov. 1968, pp. 1310-1317.
J. P. Bacon, New Developments in Ultrasonic Transducers and Their Application to Non-Destructive Testing, Non Destructive Testing, May-Jun. 1961, pp. 184-187.
Nagy Art
Proudian Andrew P.
Beauchamp John P.
Queisser Richard C.
Second Foundation
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