Measuring and testing – Vibration – By mechanical waves
Patent
1982-03-09
1984-04-17
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
73626, 128660, G01N 2900
Patent
active
044427131
ABSTRACT:
An ultrasonic imaging apparatus has an array (10 or 100) of transducer elements (14 or 104) for transmitting ultrasonic signals into an object (12) to be analyzed through use of the transmitted signals reflected from the object and sensed by the apparatus. The transmitted signals have a first predetermined center frequency. The reflected signals sensed by the apparatus have a second center frequency less than the first center frequency as a result of signal attenuation by the object. A means (70, 62 or 150, 152-1 through 152-X) is connected to select a number of transducers (14 or 104) in the array (10 or 100) for transmitting and/or receiving the ultrasonic signals based on the second center frequency. Adjusting the number of transmitting and/or receiving transducers (14 or 104) with changes in frequency produced by signal attenuation gives improved image resolution under a wider variety of use conditions than with prior art ultrasonic imaging apparatus.
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Buxton James L.
Wilson David A.
Birmiel Howard A.
Faubion Urban H.
Gregg Edward B.
Higgins Willis E.
SRI - International
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