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NDT.net Issue - 2016-02 - Articles
NDT.net Issue: 2016-02
Publication: e-Journal of Nondestructive Testing (NDT) ISSN 1435-4934 (NDT.net Journal)
ARTICLE

Photoelastic Visualisation: Phased Array Sound Fields Part 22 – Phased array Tip Diffraction L-mode

Edward Ginzel102
Materials Research Institute105, Waterloo, Canada

Abstract: 1. Introduction: This technical note is Part 22 of a series in NDT.net. When an ultrasonic pulse is moving in a solid medium and a portion of the wavefront impinges on a boundary the wavefront can undergo changes in direction, intensity and even the mode of propagation. When the wavefront is redirected away from the boundary the process is generally considered to be “scatter”. If the dimension of the boundary is large relative to the wavelength (i.e. several wavelengths) the process may be considered “reflection”. If the large reflecting surface is smooth (e.g. having roughness dimensions much less than the wavelength of the pulse) the reflection can be considered “specular”, which simply means it has the properties of a mirror. However, if the boundary dimension is small with respect to the wavelength of the pulse, the process can become diffraction. Diffraction is simply the bending of a wavefront passing through a narrow aperture or across an edge......


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Keywords: Ultrasonic Testing (UT) (4108), phased array (622), tip diffraction (6), ultrasonic (106), Photoelastic visualisation (18),
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