期刊
NDT & E INTERNATIONAL
卷 39, 期 5, 页码 425-431出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2005.12.003
关键词
vision-based system; displacement measurement; remote sensing; real-time; bridge structures
This study proposed the vision-based system which remotely measures dynamic displacement of bridges in real-time using digital image processing techniques. This system has a number of innovative features including a high resolution in dynamic measurement, remote sensing, cost-effectiveness, real-time measurement and visualization, ease of installation and operation and no electro-magnetic interference. The digital video camera combined with a telescopic device takes a motion picture of the target installed on a measurement location. Meanwhile, the displacement of the target is calculated using an image processing technique, which requires a target recognition algorithm, projection of the captured image. and calculation of the actual displacement using target geometry and number of pixels moved. For the purpose of verification, a laboratory test using shaking table test and field application on a bridge with open-box girders were carried out. The test results gave sufficient dynamic resolution in frequency as well as the amplitude. (c) 2006 Elsevier Ltd. All rights reserved.
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