Results 261 to 270 of about 4,793 (301)

Element parameters for ultrasonic phased arrays

AIP Conference Proceedings, 2002
The industrial use of ultrasonic phased arrays is limited by several factors, such as budget, coverage, beam steering required, as well as the limitations of array manufacture. Only at high frequencies does the minimum array size become a functional limitation.
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Ultrasonic phased arrays for weld inspections

AIP Conference Proceedings, 2002
Ultrasonic phased arrays are well suited to weld inspections. Phased arrays can perform electronic scanning (where a scan pattern is rapidly multiplexed across a component), sectorial scanning (where the angle of inspection is varied), and combinations of these two.
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Composite material ultrasonic phased array testing

AIP Conference Proceedings, 2019
This thesis discusses the results of an ultrasound testing of a fiberglass plate using a flaw detector with phased antenna arrays. Fiber-reinforced laminated composite materials are widely used in modern light-weight structures. Non- destructive experiments carried out on the composite plate with artificial defects. The examined 5 mm sample was made of
N. A. Ryngach, A. V. Emirov
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Optical beamforming for ultrasonic phased arrays

LEOS '95. IEEE Lasers and Electro-Optics Society 1995 Annual Meeting. 8th Annual Meeting. Conference Proceedings, 2002
This paper describes potentially low cost, lightweight, and compact optical beamforming techniques for ultrasonic phased arrays. The use of a pair of tiny stamp-size low cost nematic liquid crystal (NLC) 2-D optical array devices for the transducer control sites allows compact, low control power beamforming for large (i.e., >128 element) 2-D transducer
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Phased Array Ultrasonic Inspection of Titanium Forgings

AIP Conference Proceedings, 2007
Aerospace 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, R. Klaassen, N. Kurkcu, J. Barshinger, C. Chalek, E. Nieters, Zongqi Sun, F. deFromont   +7 more
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Ultrasonic imaging with narrow aperture phased array

Electronics and Communications in Japan (Part III: Fundamental Electronic Science), 2002
AbstractThis 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, Akihisa Ohya, Iwaki Akiyama   +2 more
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Defect identification by an ultrasonic cylindrical phased array

2016 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA), 2016
In this paper, a new method is presented for defects classification by ultrasonic cylindrical phased array. Firstly, a finite element model is conducted to simulate the defects identification by the cylindrical phased array transducer. A series of simulation are done for 4 types of defects with different sizes by a 64-element cylindrical phased ...
Shi-wen Chen, Bi-xing Zhang
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Method of processing of ultrasonic signal of phased array

2015 International Conference on Mechanical Engineering, Automation and Control Systems (MEACS), 2015
The paper presents a method of reducing the matrix that keeps the distance which went ultrasound and an data processing algorithm for the phased array system using MatLab. Cut of the control object for the phased array containing of 16 sensors is presented.
A.S. Asochakov, Y.V. Shulgina, A.I. Soldatov, E.M. Shulgin, D.N. Ogorodnikov   +4 more
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Ultrasonic phased array design for reduced crosstalk

The Journal of the Acoustical Society of America, 1998
In recent years, therapeutic ultrasound has received increased attention as a treatment modality for cancer therapy (hyperthermia) and heart arrythmia (ablation surgery). Ultrasonic phased arrays offer the benefit of noninvasive treatment with the flexibility of variable focus and beam steering. In designing and building these arrays, electromechanical
John Dodson, Karl Grosh
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Ultrasonic receive beamformer with phased sub-arrays

The Journal of the Acoustical Society of America, 1997
An 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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