Proceedings ArticleDOI
Laser Ultrasonic Study of Crack Tip Diffraction
M. Ochiai,D. Lévesque,R. Talbot,A. Blouin,A. Fukumoto,J.‐P. Monchalin +5 more
- Vol. 657, Iss: 1, pp 1489-1496
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TLDR
In this paper, a laser-ultrasonic system combined with time-of-flight (TOFD) analysis is produced and demonstrates accurate crack sizing on an artificial slot having a variable depth from 0 mm to 10 mm.Abstract:
Ultrasonic diffraction pattern at a crack tip and crack depth sizing based on the diffraction are studied by using laser‐generated bulk waves Directivity patterns oriented essentially along the normal for the diffracted longitudinal wave and essentially at 45 (deg) for the diffracted shear wave for any incident angles is obtained A laser‐ultrasonic system combined with time‐of‐flight (TOFD) analysis is produced and demonstrates accurate crack sizing on an artificial slot having a variable depth from 0 mm to 10 mm An improvement of signal‐to‐noise ratio by split spectrum processing (SSP) is also suggestedread more
Citations
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Journal ArticleDOI
High temperature ultrasonic crack monitoring using SH waves
TL;DR: In this article, a permanently installable high temperature crack monitoring system using an array of waveguides to excite shear horizontal (SH) waves on the surface of the component that is to be inspected is described.
Journal ArticleDOI
Image-based sizing of surface-breaking cracks by SH-wave array ultrasonic testing.
K. Kimoto,S. Ueno,Sohichi Hirose +2 more
TL;DR: The results of the imaging show that the depths of open cracks can be estimated accurately and that crack opening (closing) behavior can be deduced by observing appearance (disappearance) of the peak in the images indicating the crack tip.
Proceedings ArticleDOI
SiGnal Processing Techniques For Nondestructive Evaluation Using Laser Ultrasonics
Marvin Klein,Homayoon Ansari +1 more
TL;DR: In this paper the acquired temporal signals have features which differ from those acquired using conventional transducers and techniques which have been used to process these signals are described and discussed.
Journal ArticleDOI
A Sensitive Frequency Range Method Based on Laser Ultrasounds for Micro-Crack Depth Determination
TL;DR: In this article , a low-pass filter model based on the interaction between Rayleigh waves and surface cracks is built and shows that the stop band, called the sensitive frequency range, is sensitive to the depth of surface cracks.
References
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Journal ArticleDOI
Optical Detection of Ultrasound
TL;DR: A review of the various optical methods to detect ultrasound at the surface of opaque solids is presented, including description of knife-edge techniques, optical heterodyning, differential interferometry, and velocity (time-delay) interferometer methods.
Journal ArticleDOI
Directivity patterns of laser‐generated ultrasound in aluminum
TL;DR: Directivity patterns of laser generated longitudinal and shear waves in aluminum have been determined experimentally, for laser power densities both above and below the threshold for plasma formation on the target's surface as mentioned in this paper.
Journal ArticleDOI
Surface Acoustic Wave Interactions with Cracks and Slots: A Noncontacting Study Using Lasers
TL;DR: The interaction of surface acoustic Rayleigh pulses with surface-breaking defects has been experimentally studied and it is shown that reflected waveforms from a defect possess two major components.
Journal ArticleDOI
Surface‐breaking fatigue crack detection using laser ultrasound
Q. Shan,Richard Dewhurst +1 more
TL;DR: In this article, a fast skimming longitudinal pulse which is also transmitted through the fatigue crack is presented, and another ultrasonic feature is consistent with a longitudinal wave which is mode converted to a diffracted shear pulse by the tip of a fatigue crack.
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