Noncontact Dynamic Displacement Measurement Using FSF Laser
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Bibliographic Details
| Author(s): |
Mahito Fujii
Shuji Umemoto Takefumi Hara Noriyuki Miyamoto Takuji Okamoto Hiromasa Ito Yozo Fujino 
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| Medium: | conference paper | ||||
| Language(s): | English | ||||
| Conference: | IABSE Symposium: Sustainable Infrastructure - Environment Friendly, Safe and Resource Efficient, Bangkok, Thailand, 9-11 September 2009 | ||||
| Published in: | IABSE Symposium Bangkok 2009 | ||||
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| Page(s): | 110-116 | ||||
| Total no. of pages: | 7 | ||||
| Year: | 2009 | ||||
| DOI: | 10.2749/222137809796089070 | ||||
| Abstract: |
The measurement principle employed in the Frequency-shifted Feedback Laser (FSFL) enables remote/noncontact measurement, and its accuracy is not dependent on distance. Because the maximum response frequency of the FSFL is 1000 Hz, it is a promising technology for application to high accuracy, remote/noncontact dynamic measurements. Previous static field tests of the FSFL have verified that measurement with high accuracy of 200μm at a distance of 500 m is possible. In the present research, the authors conducted a laboratory experiment using a vibration board (natural frequency: 10 Hz), and also made dynamic measurements of bridges in service. The results verified the dynamic measurement performance of the FSFL and confirmed its applicability to bridges in service. |
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| Keywords: |
deflection FSF Laser structual health monitoring dynamic displacement measurement remote noncontact
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