Institute for Laser Technology
| Project/Area Number |
25420495
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Structural engineering/Earthquake engineering/Maintenance management engineering
|
|---|
| Research Institution | Institute for Laser Technology |
|---|
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)
|
|---|
| 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)
|
|---|
| Project Period (FY) |
2013-04-01 – 2016-03-31
|
| Project Status |
Completed (Fiscal Year 2015)
|
| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
|
|---|
| Keywords | laser system / vibration measurement / laser-based system / two-beam probing / nondestructive testing / bridge / remote inspection / highway bridge / laser interferometry / bouncing bridge |
|---|
| 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.
|
Report
(4 results)
Research Products
(2 results)
