| Budget Amount *help |
¥15,860,000 (Direct Cost: ¥12,200,000、Indirect Cost: ¥3,660,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2015: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2014: ¥9,750,000 (Direct Cost: ¥7,500,000、Indirect Cost: ¥2,250,000)
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| Outline of Final Research Achievements |
This study investigated defect imaging in plate-like structures using scanning laser source (SLS) technique, in which laser pulse for generating elastic wave is rastered over a plate and the elastic wave is detected at a fixed point on it. In this study, irradiating laser pulses at high repetition rate by fiber laser and modulating them enabled to generate narrowband burst elastic waves and improved signal level in frequency range. Moreover, it was theoretically and experimentally confirmed that averaging images at multiple frequencies provides clearer defect images. Using the experimental system with these functions, images of an inner wall-thinning were obtained for such a complex plate-like structures as a branched pipe by the measurements from 6 meters away.
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