Paper

Estimation of a Drill Hole’s Center Location from the Wavefront in Scattering Waves Visualized by Pulsed Laser Scanning


Authors:
Tetsuya Yamamoto; Hiroshi Tsuda; Junji Takatsubo
Abstract
The center location of a defect (a drill hole, DH) in a solid material was estimated using the circular-shaped wavefront of scattering waves. Measurement data recorded by a pulsed laser scanning system were used in the calculation. For data preprocessing, two techniques were applied: with the waveform peaks being extracted from the original measurement signals, and then a suitable threshold level being applied to the peak-extracted data. The center location of the hole was detected using the scattering wavefront of the snapshot images obtained immediately after reflection from the hole. Efficient calculation can be achieved as a result of decreasing a great number of pixel points in the snapshot images. This imaging technique is a promising candidate for use in an automatic defect inspection system that employs ultrasonic waves excited by pulsed laser scanning.
Keywords
Defect Detection; Pulsed Laser Scanning; Scattering Wave; Non-Destructive Inspection; Drill Hole
StartPage
19
EndPage
28
Doi
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