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Time-of-flight diffraction ultrasonics

About: Time-of-flight diffraction ultrasonics is a research topic. Over the lifetime, 544 publications have been published within this topic receiving 3189 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, a comparative study of matlab simulation results of classic approach signal processing methodology and split spectrum processing (SSP) with the Polarity Thresholding algorithm (PT) to the TOFD welding defect is presented.
Abstract: Ultrasonic welding defect signals are not processed, they are very difficult to identify the pattern of the defect, especially the TOFD welding defect signals are often mixed with noise and lead to confusion between grain noise and small flaws. It is very difficult to interpret the result defect and noise due to larger grain noise. This paper describes the comparative study of matlab simulation results of classic approach signal processing methodology and Split Spectrum Processing (SSP) with the Polarity Thresholding algorithm (PT) to the TOFD welding defect. A-scan signals are used to enhance SNR while suppressing the grain noise. The simulation results show that the welding defect TOFD signals after the SSP investigation are the best and produce the qualified output.

1 citations

Patent
23 Dec 2015
TL;DR: In this article, the utility model relates to a visual ultrasonic wave TOFD welding seam detecting system that can singlely use, sweep including ultrasonic testing and look into frame and screen data display device, the ultrasonic detection who is responsible for the welding seam respectively shows with the detection data are accurate.
Abstract: The utility model relates to a visual ultrasonic wave TOFD welding seam detecting system that can singlely use, sweep including ultrasonic testing and look into frame and screen data display device, the ultrasonic detection who is responsible for the welding seam respectively shows with the detection data are accurate, screen data display device loads to sweep to look into in ultrasonic testing and puts up, ultrasonic testing sweep look into detect the welding seam in, data are in the special TOFD instrument indication of distal end, to detect the complete demonstration of data again on ultrasonic testing sweeps the screen data display device on looking into the frame through the data line, realize single independent the detection, system convenient to use, it is extravagant to reduce the manpower, detection efficiency is high and the testing result is stable.

1 citations

Book ChapterDOI
01 Jan 1989
TL;DR: In this article, the authors present some of the important developments and outstanding problems highlighted by the review and present a review of the most important developments in the field of time-of-flight diffraction.
Abstract: SUMMARY The ultrasonic energy diffracted from the tips of cracks has been used in the sizing and evaluation of defects for some 20 years. Industrial application is now possible by means of the time of flight diffraction (TOFD) technique developed by one of us (MS) at Harwell and the focussing, echodynamic time-of-flight (FET) technique developed by the other authors at the Ecole Centrale. We have recently jointly reviewed progress in this field1 and this paper presents some of the important developments and outstanding problems highlighted by the review.

1 citations

Journal Article
TL;DR: Stationary Wavelet Transform has been used for de-noising of the real time ultrasonic ToFD signals from austenitic stainless steel welds and its performance is compared with that of the DWT.
Abstract: Inspection of structural materials is an important aspect in many industrial applications. Ultrasonic Non-Destructive Testing (NDT) is one of the most widely used techniques in this aspect. Conventional pulse echo and through transmission methods in Ultrasonic Testing (UT) are not reliable in detection of defects with random orientation due to its reflection principle. Time of Flight Diffraction (ToFD) method has gained more popularity in this area in the recent past. It uses diffraction energy and has more advantages in detection, sizing and positioning of the defects irrespective of type, orientation and characteristics. This technique is hampered by several of the unwanted signals arising due to ultrasonic interaction with the material grains. This noise affects the visibility of a defect signal especially when the defect size is small. Many signal processing techniques such as split spectrum processing, wavelet transform and correlation etc are available for de-noising of signals. Among this Discrete Wavelet Transform (DWT) is widely used due to its added advantage of time-frequency information simultaneously. Stationary Wavelet Transform (SWT) is a form of DWT with the main difference that it is translation invariant unlike DWT. In this paper SWT has been used for de-noising of the real time ultrasonic ToFD signals from austenitic stainless steel welds and its performance is compared with that of the DWT. General Terms NDT, Ultrasonic Testing, ToFD, Signal Processing, Wavelets.

1 citations

Journal Article
TL;DR: Precision de la localisation d'un defaut ponctuel en controle par ultrasons avec la technique de diffraction et temps de vol is presented in this paper.
Abstract: Precision de la localisation d'un defaut ponctuel en controle par ultrasons avec la technique de diffraction et temps de vol

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202110
202017
201919
201823
201724
201624