Journal
NDT & E INTERNATIONAL
Volume 79, Issue -, Pages 73-80Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2015.12.006
Keywords
Bridge deflection; Off-axis digital image correlation; Image matching; Sub-pixel displacement
Funding
- National Natural Science Foundation of China [11272032, 11322220, 11427802]
- Program for New Century Excellent Talents in University [NCET-12-0023]
- Beijing Nova Program [xx2014B034]
- State Key Laboratory of Traction Power of Southwest Jiaotong University [TPL1607]
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An advanced video deflectometer using off-axis digital image correlation is proposed for real-time, non contact and targetless measurement of vertical deflection of bridges. To achieve real-time displacement tracking with sub-pixel accuracy, an efficient inverse compositional Gauss-Newton algorithm is employed. The detected image displacements in pixels are converted to physical displacements in millimeters using an easy-to-implement yet accurate calibration technique with the aid of a laser rangefinder. Real translation tests with precisely controlled motions were performed to examine the accuracy of the proposed technique. Real-time deflection monitoring of a railway bridge subjected to train pass-by is also demonstrated to show the practicality, accuracy and application potential of the proposed technique. (C) 2015 Elsevier Ltd. All rights reserved.
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