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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.55  No.7 (2014)  >  pp.1045-1050

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Imaging Defects in a Plate with Full Non-Contact Scanning Laser Source Technique

Takahiro Hayashi1), Morimasa Murase1), Natsuki Ogura1), Tsunaji Kitayama1)
1) Toyota Central R&D Labs., Inc.

Previously, we used contact receiving transducers in the scanning laser source (SLS) technique for imaging defects on a plate in order to achieve a high signal-to-noise (SN) ratio. Herein, we developed a fast non-contact defect imaging technique that employs the SLS technique for in-line product inspection. Leaky Lamb waves from a plate were detected with a sufficiently large SN ratio by using low-frequency air-coupled transducers. Spurious images caused by reflected waves in the plate were removed by synthesizing images from multiple receivers. Defect images were compared for different repetition frequencies of laser emission. Images were found to be distorted at high repetition frequencies (2/3 kHz) owing to reverberations in the plate.

laser ultrasonics, Lamb waves, imaging, non-contact evaluation, air-coupled ultrasonic transducer

Received: July 21, 2013
Accepted: January 20, 2014 , Published online: June 25, 2014
Copyright © 2014 The Japanese Society for Non-Destructive Inspection



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