Journal
NDT & E INTERNATIONAL
Volume 41, Issue 7, Pages 544-553Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2008.04.005
Keywords
ambient vibration testing; bridge; interferometry; output-only modal analysis; radar
Funding
- M.I.U.R. (Italian Ministry of University and Research) [PRIN06]
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This paper addresses the application of a non-contact vibrometer, designed for dynamic testing and monitoring of large structures. The new system consists of a radar sensor apt to simultaneously measure the (static or dynamic) displacement of several points of a structure with high sensitivity. In this paper, the sensor and its major characteristics are first described; subsequently, application to the measurement of ambient vibration response of a concrete bridge is summarized. The correspondence between the signals simultaneously acquired from radar and accelerometers was extensively investigated: furthermore, resonant frequencies and mode shapes identified with the radar system are compared to the corresponding quantities measured with conventional sensors. (c) 2008 Elsevier Ltd. All rights reserved.
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