Results 301 to 310 of about 16,283 (340)
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Ultrasonic imaging with narrow aperture phased array
Electronics and Communications in Japan (Part III: Fundamental Electronic Science), 2002AbstractThis paper describes the method of narrow aperture phased array ultrasonic computed tomography (NAPA‐CT), conceived for three‐dimensional imaging with increased resolution and speed in the field of clinical diagnosis. By reducing the size of the transducer in the thickness direction, a beam is formed such that the focal region of the phased ...
Naoki Takizawa +2 more
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Ultrasonics, 2020
High-order ultrasonic guided wave modes have recently been attracting interest in a variety of nondestructive testing applications, ranging from thickness gauging to bond characterization. Accurate control of the transmitted ultrasonic guided wave mode is paramount when working at frequencies above the cutoff of the first high-order mode.
Geoffrey, Veit, Pierre, Bélanger
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High-order ultrasonic guided wave modes have recently been attracting interest in a variety of nondestructive testing applications, ranging from thickness gauging to bond characterization. Accurate control of the transmitted ultrasonic guided wave mode is paramount when working at frequencies above the cutoff of the first high-order mode.
Geoffrey, Veit, Pierre, Bélanger
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Portable Ultrasonic Phased Array System
2004A new portable Phased Array System is presented in this contribution. Due to the modern computer technology it allows to generate in a fast way sector scans with extremely high lateral and axial resolution. The sector scan image is a final composition of separate scans with sound beams being focussed to different depths and then scanned by sweeping and
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Phased Array Ultrasonic Inspection of Titanium Forgings
AIP Conference Proceedings, 2007Aerospace forging inspections typically use multiple, subsurface‐focused sound beams in combination with digital C‐scan image acquisition and display. Traditionally, forging inspections have been implemented using multiple single element, fixed focused transducers.
P. Howard +7 more
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An Ultrasonic Phased Array Applicator for Hyperthermia
IEEE Transactions on Sonics and Ultrasonics, 1984An ultrasonic phased array applicator for hyperthermia provides electronic steering of the sound beam rather than mechanical movement of the transducer assembly. An applicator consisting of a stack of linear phased arrays is examined. The effects of various design parameters, including individual array height and length, are discussed.
K.B. Ocheltree +3 more
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Rail weld inspection using phased array ultrasonics
AIP Conference Proceedings, 2013Inspection of rail welds has always been a challenge to the Railways. The conventional ultrasonic methods which are employed now for the detection of defects are not found to be good enough for defects that exist in different parts of the weld. Phased Array Ultrasonics which performs sectorial scanning could be used effectively for detection of defects
Girish N. Namboodiri +4 more
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Ultrasonic receive beamformer with phased sub-arrays
The Journal of the Acoustical Society of America, 1997An ultrasonic receive beamformer includes transducers forming receive signals that are applied to sub-array processors. Each sub-array processor includes at least one phase shifter and a summer, and each phase shifter is responsive to at least one of the transducer signals to shift the transducer signal by a respective phase angle and to apply the ...
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Two-dimensional phased array of ultrasonic transducers
The Journal of the Acoustical Society of America, 1991A two-dimensional ultrasonic phase array is a rectilinear approximation to a circular aperture and is formed by a plurality of transducers, arranged substantially symmetrical about both a first (X) axis and a second (Y) axis and in a plurality of subarrays, each extended in a first direction (i.e.
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Improvement of ultrasonic testing by phased arrays
Nuclear Engineering and Design, 1983Abstract Methods for defect reconstruction and classification using the flexible and fast electronic beam forming with phased arrays have been described. Using the electronic sector scan, a reflecting point is represented as a short circular curve, the length of which is dependent upon beam width and system sensitivity.
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Long-Range Ultrasonic and Phased Array Technologies
2017Extensive knowledge is required for proper use of phased array technology with long-range ultrasonic technique (LRUT) and subsequent interpretation of the results in connection with the study of the interaction of low-frequency ultrasonic waves with discontinuities in pipelines.
Y. N. Mirchev +3 more
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