Results 101 to 110 of about 296 (144)

TIME OF FLIGHT DIFFRACTION (ToFD) WITH THz RADIATION—AN ALTERNATIVE TO THE ULTRA SOUND—ToFD TECHNIQE FOR NON-METALLIC MATERIALS

AIP Conference Proceedings, 2011
A time domain spectrometer in the range of 0.5–2 THz was used for time of flight (ToF) measurements of THz pulses for imperfection detection in non metallic materials. The measurements were performed in comparison to the established ultra sound pulse echo (PE) and time of flight diffraction (ToFD) technique.
U. Ewert, J. Beckmann, L. S. von Chrzanowski, G. Brekow, D. Brackrock, Donald O. Thompson, Dale E. Chimenti   +6 more
exaly   +4 more sources

Reliability assessment of manual ultrasonic time of flight diffraction (TOFD) inspection for complex geometry components

NDT & E International, 2010
Experimental probability of detection (POD) and probability of sizing (POS) curves are developed for the detection and sizing of surface-breaking cracks in components having complex geometry. A manual ultrasonic time of flight diffraction (TOFD) inspection system has been used to develop these POD and POS curves.
S.K. Nath, Krishnan Balasubramaniam, C.V. Krishnamurthy, B.H. Narayana   +3 more
exaly   +4 more sources

Sizing of surface-breaking cracks in complex geometry components by ultrasonic Time-of-Flight Diffraction (TOFD) technique

Insight - Non-Destructive Testing and Condition Monitoring, 2007
Sizing a surface-breaking crack in a complex geometry component, for example a steam turbine's solid rotor shaft, is a challenging inspection task. This paper deals with experimental work for the evaluation of the Time-of-Flight Diffraction (TOFD) technique for sizing of surface-breaking cracks in such a complex geometry component.
S K Nath, K Balasubramaniam, C V Krishnamurthy, B H Narayana   +3 more
exaly   +4 more sources

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A metrological approach to the time of flight diffraction method (ToFD)

Measurement, 2021
Abstract Introduction Non-Destructive Testing (NDT) is widely used in industry, especially in the evaluation of mechanical parts and structures for identifying defects, corrosion, flaws or imperfections. Time of flight diffraction (ToFD) is a method to assess discontinuities high within a workpiece or material, what is not easy to do with ...
R.C. Mayworm, A.V. Alvarenga, R.P.B. Costa-Felix   +2 more
openaire   +3 more sources

An alternative Ultrasonic Time of Flight Diffraction (TOFD) method

NDT & E International, 2018
Abstract In this work an alternative TOFD method is presented, capable to detect and size defects in the inspected material with good precision. It was shown that the diffraction used in this technique is the most relevant signal among the longitudinal backwall and the shear backwall echoes, compared to other TOFD methods.
F.W.T. Yeh, T. Lukomski, J. Haag, T. Clarke, T. Stepinski, T.R. Strohaecker   +5 more
openaire   +3 more sources

Reduction of Layered Dead Zone in Time-of-Flight Diffraction (TOFD) for Pipeline with Spectrum Analysis Method

Journal of Nondestructive Evaluation, 2021
When ultrasonic time-of-flight diffraction (TOFD) B-scan is implemented along the circumferential direction of pipeline, the ray path of direct longitudinal wave (DLW) is not parallel to the curved pipeline surface, inducing the layered dead zone.
S. J. Jin, B. Zhang, X. Sun, L. Lin
openaire   +3 more sources

Inspection Using Shear Wave Time of Flight Diffraction (S-TOFD) Technique

AIP Conference Proceedings, 2006
Ultrasonic Time of Flight Diffraction (TOFD) for sizing defects is based on the time of flight of the longitudinal diffracted echo(es) that is (arc) generated when a longitudinal wave is incident on a crack tip. TOFD technique so far has been commonly applied for the inspection of thick sections (>15 mm) and thickness below 5 mm from the scanning ...
G Baskaran, Krishnan Balasubramaniam, C V Krishnamurthy   +2 more
openaire   +3 more sources

Three Dimensional Characterization of Defects by Ultrasonic Time-of-Flight Diffraction (ToFD) Technique

Journal of Nondestructive Evaluation, 2018
Ultrasonic time-of-flight diffraction (ToFD) technique has high accuracy in locating and sizing discontinuities. The primary reason for this accuracy is the use of time instead of amplitude for measurement of the depth and size of discontinuities. Despite the many advantages of ToFD, it suffers from a number of shortcomings, the most notable one being ...
Ali Habibpour-Ledari, Farhang Honarvar
openaire   +3 more sources

Time-of-flight diffraction (TOFD) technique for accurate sizing of surface-breaking cracks

Insight - Non-Destructive Testing and Condition Monitoring, 2003
This paper deals with an experimental study for evaluation of TOFD technique for determination of size of the surface breaking cracks. The study was confined to simulated cracks. The steel test blocks used for the study contained 0.5mm wide vertical slits of various heights ranging from 0.91mm to 30mm. Another set of blocks contained inclined slits (10°
Sony Baby, T Balasubramanian, R J Pardikar, M Palaniappan, R Subbaratnam   +4 more
openaire   +3 more sources

Time of Flight Diffraction Technique (TOFD-T) as an Alternative to X-Ray Examination for Thick Welds: A Literature Review

Volume 5: High Pressure Technology; Nondestructive Evaluation Division; Student Paper Competition, 2009
In the nuclear industry, and in particular, regarding large steel components including the nuclear steam supply system, weld integrity must be assessed and confirmed during the fabrication process, for the initial field-welds and periodically during in-service follow-up of some critical assembly welds.
Alexandre Bleuze, Julien Banchet, S. W. Glass, Jean-Michel Tchilian, Andre´ Thomas, Michel Jambon, Vanessa Godefroy   +6 more
openaire   +2 more sources