Results 221 to 230 of about 2,848 (264)

Characteristics of an ultrasonic phased array transmitter in medium range

Ultrasonics, 2018
An ultrasonic phased array transmitter (PAT) consisting of 12×12 elements was designed and fabricated to evaluate its experimental characteristic performance in the medium range of 2m-10m for its directivity, pulse width affect and sound pressure level (SPL) measurements as a function of distance from its center in the open air. The SPL was measured at
Sahdev, Kumar, Hideo, Furuhashi
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Pressure Vessels Inspections Using Ultrasonic Phased Arrays

Ultrasonic Nondestructive Evaluation for Material Science and Industries, 2003
Phased arrays offer significant technical advantages for weld inspections over conventional ultrasonics. The phased array beams can be steered, scanned, swept and focused electronically. Beam steering permits the selected beam angles to be optimized ultrasonically by orienting them perpendicular to the predicted defects, especially Lack of Fusion ...
M.D.C. Moles, F. Jacques, N. Dube
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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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Ultrasonic Phased Array Technology in the Pipeline Industry

Volume 2: Integrity and Corrosion; Offshore Issues; Pipeline Automation and Measurement; Rotating Equipment, 2000
This paper presents an overview of current pipeline inspection techniques, and a more in depth discussion of phased array technology as it applies to the inspection of automated GMAW girth welds in big inch pipelines.
Eric M. Sjerve, George F. Bryant, David C. Stewart   +2 more
openaire   +1 more source