Measuring and testing – Vibration – By mechanical waves
Patent
1982-03-09
1984-05-08
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
73599, 73625, 128660, G01N 2900
Patent
active
044467400
ABSTRACT:
This ultrasonic imaging apparatus has an array (44, 52 or 100) of transducer elements (44, 50 or 104) for transmitting ultrasonic signals having a first predetermined center frequency (fc1) into an object (12) to be analyzed through use of the transmitted signals reflected from within the object. A means (150, 116-1 through 116-X and 120-1 through 120-X) is connected to transmit the ultrasonic signals from the array (44, 52 or 104) in a stepped array mode. A means (150, 116-1 through 116-X and 120-1 through 120-X) is connected to transmit the ultrasonic signals from the array (44, 52 or 104) in an angle scanning mode. There is a means (150, 128-1 through 128-X) for focusing the transmitted signals at a desired depth within the object (12). The reflected signals sensed by the apparatus have a second center frequency (fc2) less than the first center frequency (fc1) as a result of signal attenuation by the object (12). There is a means connected to select between the stepped array transmission mode and the angle scanning transmission mode for operating the array elements based on the second center frequency (fc2). Varying the operating mode of the apparatus on this basis gives improved image resolution over a wider operating range than with prior art systems.
REFERENCES:
patent: 3815409 (1974-06-01), Macovski
patent: 4016750 (1977-04-01), Green
patent: 4290310 (1981-09-01), Anderson
patent: 4307613 (1981-12-01), Fox
patent: 4319489 (1982-03-01), Yamaguchi et al.
patent: 4368643 (1983-01-01), Tachita et al.
patent: 4372323 (1983-02-01), Takemura et al.
"Computer Controlled Acoustic Beam Steering and Focusing with Variable Frequency Array Transducers", Reid et al, IBM Technical Disclosure Bulletin, vol. 22, No. 4, pp. 1696-1697, Sep. 1979.
Buxton James L.
Green Philip S.
Wilson David A.
Birmiel Howard A.
Faubion Urban H.
Gregg Edward B.
Higgins Willis E.
SRI - International
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