Measuring and testing – Vibration – By mechanical waves
Patent
1985-02-04
1986-12-02
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
73598, 73625, 128660, G01N 2904
Patent
active
046255559
ABSTRACT:
In a method and apparatus for ultrasonic measurement, there are provided first and second ultrasonic transducers arranged to directly oppose each other across an object interposed therebetween, and a third ultrasonic transducer, the transducers being so arranged that a ray from the third ultrasonic transducer intersects, internally of the object, a ray connecting the first and second ultrasonic transducers. A first period of time required for an ultrasonic wave emitted by the first ultrasonic transducer to be received by the second ultrasonic transducer through the object is measured, as well as second and third periods of time respectively required for an ultrasonic wave emitted by the third ultrasonic transducer to be received by the first and second ultrasonic transducers following scattering of the ultrasonic wave from within the object. Mean propagation velocity of sound or a distribution of propagation velocity of sound internally of the object is measured on the basis of the first, second and third periods of time.
REFERENCES:
patent: 3690155 (1972-09-01), Eichler
patent: 4074564 (1978-02-01), Anderson
patent: 4399702 (1983-08-01), Suzuki
Japanese Language Publication, pp. 292-299 and 482.
Ultrasonic Imaging, an International Journal, vol. 5, No. 2, Apr. 1983, pp. 161 and 168.
Japanese Journal of Medical Ultrasonics, vol. 7, No. 1, 1980, pp. 35-44 by Choi Yong-Soo and Shinichi Matsubara.
Birmiel Howard A.
Terumo Kabushiki Kaisha
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