AUTHOR=Brownjohn James Mark William , Xu Yan , Hester David TITLE=Vision-Based Bridge Deformation Monitoring JOURNAL=Frontiers in Built Environment VOLUME=3 YEAR=2017 URL=https://www.frontiersin.org/journals/built-environment/articles/10.3389/fbuil.2017.00023 DOI=10.3389/fbuil.2017.00023 ISSN=2297-3362 ABSTRACT=

Optics-based tracking of civil structures is not new, due to historical application in surveying, but automated applications capable of tracking at rates that capture dynamic effects are now a hot research topic in structural health monitoring. Recent innovations show promise of true non-contacting monitoring capability avoiding the need for physically attached sensor arrays. The paper reviews recent experience using the Imetrum Dynamic Monitoring Station (DMS) commercial optics-based tracking system on Humber Bridge and Tamar Bridge, aiming to show both the potential and limitations. In particular, the paper focuses on the challenges to field application of such a system resulting from camera instability, nature of the target (artificial or structural feature), and illumination. The paper ends with evaluation of a non-proprietary system using a consumer-grade camera for cable vibration monitoring to emphasize the potential for lower cost systems where if performance specifications can be relaxed.