Results 181 to 190 of about 514,588 (251)
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Measurement, 2018
This paper proposes an ultrasonic testing system for inspection of pitting corrosion cracks in rivets of multilayer structures. The inspection operates in B-scan mode with an ultrasonic probe passing over the rivet head. The ultrasonic signal is analyzed
Minhhuy Le +3 more
semanticscholar +1 more source
This paper proposes an ultrasonic testing system for inspection of pitting corrosion cracks in rivets of multilayer structures. The inspection operates in B-scan mode with an ultrasonic probe passing over the rivet head. The ultrasonic signal is analyzed
Minhhuy Le +3 more
semanticscholar +1 more source
Safety Assessment of an
ObjectivesThis study describes the safety assessment of an A‐scan ultrasonic system for ophthalmic use. The system is an investigational medical device for automatic cataract detection and classification.MethodsThe risk management was based on the International Organization for Standardization (ISO) standard DIN EN ISO 14971:2009‐10 and International ...
Lorena Petrella +9 more
openaire +2 more sources
IEEE Sensors Journal, 2020
Electromagnetic Acoustic Transducer (EMAT) has become one of the fastest-growing solutions for pipeline weld inspection over the past decade due to its non-contact advantage.
Yan Yan +4 more
semanticscholar +1 more source
Electromagnetic Acoustic Transducer (EMAT) has become one of the fastest-growing solutions for pipeline weld inspection over the past decade due to its non-contact advantage.
Yan Yan +4 more
semanticscholar +1 more source
A digital portable instrument for A-scan ultrasonic flaw inspection
Fifth World Congress on Intelligent Control and Automation (IEEE Cat. No.04EX788), 2004Based on ultrasonic nondestructive examination, an A-scan flaw inspection instrument is developed. It is an intelligent instrument, which is used to detect flaws in steel plates and is automatic inspection and alarming. In this article, system hardware structure is introduced, the data processing unit is described and especially the method to realize ...
null Xianglin Zhan +3 more
openaire +1 more source
Development of a synthetic A-scan technique for ultrasonic testing of pipelines
IMTC/2002. Proceedings of the 19th IEEE Instrumentation and Measurement Technology Conference (IEEE Cat. No.00CH37276), 2003Multiple-boundary echoes are often seen in ultrasonic testing of materials, particularly in laminates. Although these echoes can be a problem in many situations in masking the signals of interest, they can also be used to advantage, e.g., in identifying disbonds in laminates or the presence and properties of materials beneath the test surface. However,
G.P.P. Gunarathne, Y. Qureshi
openaire +1 more source
IEEE Transactions on Instrumentation and Measurement
This article compares low-frequency (LF) Lamb waves in a pitch-catch configuration and high-frequency (HF) bulk waves in a pulse-echo mode for ultrasonic C-scan imaging of composite lap joints.
M. Barzegar +3 more
semanticscholar +1 more source
This article compares low-frequency (LF) Lamb waves in a pitch-catch configuration and high-frequency (HF) bulk waves in a pulse-echo mode for ultrasonic C-scan imaging of composite lap joints.
M. Barzegar +3 more
semanticscholar +1 more source
A scanning electron microscopic study of in vivo ultrasonic root-end preparations
Journal of Endodontics, 1999The purpose of this in vivo study was to evaluate root-ends for cracks after root resection and again after ultrasonic root-end preparation in patients undergoing endodontic surgery. Endodontic surgery was performed on 25 roots from 20 patients. In vivo vinyl polysiloxane impressions were made after root resection and again after ultrasonic root-end ...
L A, Morgan, J G, Marshall
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Recording and storage of ultrasonic grey-scale images with a scan converter
The British Journal of Radiology, 1975Scan converters enable high-resolution grey-scale pictures to be obtained in ultrasonic examinations; the devices record in a non-integrating manner with only the peak value of an echo amplitude being recorded for any location, unlike storage oscilloscopes or short persistence oscilloscopes used with film.
A J, Hall, R, Railton
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Wavelet denoising of ultrasonic A-scans by random partial cycle spinning
2012 IEEE International Ultrasonics Symposium, 2012Wavelet shrinkage schemes are applied for reducing noise in synthetic and experimental ultrasonic A-scans, using the Discrete Wavelet Transform (DWT) and a cycle-spinning (CS) implementation of Undecimated Wavelet Transform (UWT). A new wavelet-based denoising procedure, which we call Random Partial Cycle Spinning (RPCS) is presented and its ...
J.L. San Emeterio +1 more
openaire +1 more source
, 2020
This study presents an approach, which couples the ultrasonic wave reflection principle and image processing for the ultrasonic phased array, to enhance the sizing surface cracks in welded tubular joints.
Liuyang Feng, X. Qian
semanticscholar +1 more source
This study presents an approach, which couples the ultrasonic wave reflection principle and image processing for the ultrasonic phased array, to enhance the sizing surface cracks in welded tubular joints.
Liuyang Feng, X. Qian
semanticscholar +1 more source