Real-time, non-contact and targetless measurement of vertical deflection of bridges using off-axis digital image correlation
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- 作者：Bing Pana ; Chinapanb@buaa.edu.cn" class="auth_mail" title="E-mail the corresponding author ; panb@buaa.edu.cn" class="auth_mail" title="E-mail the corresponding author ; Long Tiana ; Xiaolin Songb
- 关键词：Bridge deflection ; Off-axis digital image correlation ; Image matching ; Sub-pixel displacement
- 刊名：NDT and E International
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：79
- 期：Complete
- 页码：73-80
- 全文大小：1854 K
文摘
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Real-time, non-contact tracking of bridge deflection using an advanced video deflectometer is described.
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The algorithm details of the efficient digital image correlation method for real-time motion tracking are provided.
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A practical calibration method is proposed to convert image motions in pixels to physical displacements in millimeters.
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Real translation tests with precisely controlled vertical motions verified the accuracy of the video deflectometer.
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Real-time deflection monitoring of a railway bridge subjected to train pass-by demonstrated its practicality and accuracy.