Exploring surface wave interaction with angled defects in the near and far field

This paper explores some effects that occur when using laser ultrasound to scan defective samples. Surface defects can often propagate at an angle to the surface; however, for calibration, slots machined normal to the surface of the sample are typically used. Several interesting angle-dependent effe...

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Bibliographic Details
Published in:Journal of physics. Conference series 2011-01, Vol.278 (1), p.012011-4
Main Authors: Dutton, B, Clough, A R, Rosli, M H, Edwards, R S
Format: Article
Language:English
Subjects:
Angle of reflection
Calibration
Defects
Far fields
Lasers
Mathematical models
Physics
Rayleigh waves
Scanning
Surface defects
Surface waves
Ultrasound
Wave interaction
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Summary:This paper explores some effects that occur when using laser ultrasound to scan defective samples. Surface defects can often propagate at an angle to the surface; however, for calibration, slots machined normal to the surface of the sample are typically used. Several interesting angle-dependent effects are observed when Rayleigh waves interact with angled surface defects, and are explored here using measurements and models for a scanning laser detector (SLD) or scanning laser line source (SLLS) scanned across the defect. Reflection and transmission coefficients are calculated for different crack angles and lengths. Additionally, interesting angle-dependent effects are observed in the Rayleigh wave amplitude and frequency enhancements in the near field when using SLD or SLLS.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/278/1/012011