Measuring and testing – Vibration – By mechanical waves
Patent
1984-06-07
1986-02-18
Myracle, Jerry W.
Measuring and testing
Vibration
By mechanical waves
128660, 310336, G01N 2900
Patent
active
045704880
ABSTRACT:
An ultrasonic sector-scan probe comprises at least an array having a plurality of ultrasonic transducer segments, a window for transmitting and receiving ultrasonic waves and an ultrasonic wave propagation medium filled in a front space between the array and the window. A group of the ultrasonic transducer segments are selectively driven as an aperture and ultrasonic waves emitted therefrom are converged into a beam for transmission and reception. By partly or entirely changing the segments in the group with the ones outside the group the scan line is shifted to a new angle, and a member under test contacted with the window on the outside thereof is sector-scanned by the ultrasonic beam. The array is arranged so that scanning lines of the groups intersect at one point in the window or in its vicinity for sector scan. And an acoustic lens is provided in the window or in its vicinity so that the ultrasonic beam may be converged almost over the measuring depth range of the member under test with/without phase control of the segments in the group. Furthermore, the array is arranged multidimensionally or in plural linear arrays so that the scanning lines of the groups intersect substantially at one point in the window or in its vicinity for sector scan, thereby performing sector scan of at least two sections and/or three-dimensional sector scan.
REFERENCES:
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Maginness et al., "State-of-the-Art in Two-Dimensional Ultrasonic Transducer Array Technology", Medical Physics, vol. 3, No. 5 (1976), pp. 312-318.
Hayashi Hajime
Iida Atsuo
Kawabe Kenji
Miwa Hirohide
Shimura Takai
Chapman, Jr. John E.
Fujitsu Limited
Myracle Jerry W.
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