2015 Fiscal Year Final Research Report
Institute for Laser Technology
| Project/Area Number |
25420495
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Structural engineering/Earthquake engineering/Maintenance management engineering
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| Research Institution | Institute for Laser Technology |
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Principal Investigator |
Kotyaev Oleg 公益財団法人レーザー技術総合研究所, その他部局等, 研究員 (80399352)
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| Co-Investigator(Renkei-kenkyūsha) |
Yoshinori Shimada 公益財団法人レーザー技術総合研究所, レーザー計測研究チーム, 主任研究員 (80250091)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | laser system / vibration measurement |
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| Outline of Final Research Achievements |
A novel approach of laser-based remote non-destructive inspection of civil structures has been tested. The approach is based on using homodyne interferometry with two-beam probing for minimization of homodyne signal instability caused by irregular bouncing of inspected structure (like highway bridges). Two-beam probing method provides more reliable information of inspected structure conditions than conventional one-beam probing approach.
The system was designed, assembled and tested in laboratory. CO2 laser pulses with 4-Joule energy are used for initiation of vibration in inspected object. CW Nd:YVO4 laser with 0.5W output power is used as a source of two probing beams. Defects in the laboratory samples were recognized reliably. The system demonstrated significant benefit over conventional one-beam probing technique. A mobile prototype of the system was assembled and tested in the field conditions. The system demonstrated capability of real defect recognition in highway bridge.
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| Free Research Field |
laser technology
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