Vertical displacement measurements for bridges using optical fiber sensors and CCD cameras : a preliminary study

Chan, Tommy H.T., Ashebo, Demeke B., Tam, H.Y., Yu, Y., Chan, T.F., Lee, P.C., & Gracia, Eduardo Perez (2009) Vertical displacement measurements for bridges using optical fiber sensors and CCD cameras : a preliminary study. Structural Health Monitoring, 8(3), pp. 243-249.

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Bridge managers all over the world are always looking for simple ways to measure bridge vertical displacements for structural health monitoring. However, traditional methods to obtain such data are either tedious or expensive. There is a need to develop a simple, inexpensive, and yet practical method to measure bridge vertical displacements. This paper proposes two methods using either optical fiber (FBG) sensors or a charge-coupled-device (CCD) camera, respectively, for vertical displacement measurements of bridges. The FBG sensor method is based on the measured horizontal strains together with the identified curvature functions obtained by a self-developed FBG Tilt sensor. CCD cameras use a large number of pixels to form an image. The CCD camera method utilizes image processing techniques for pixel identification and subsequent edge detection. A preliminary study to validate the proposed methods in laboratory was presented. The tests include applying the methods to determine the vertical displacements separately for a concrete beam and a steel beam under various loadings. The comparisons include their installations, costs, degrees of accuracy, external factors affecting the measurement, etc. It was concluded that both methods could be used for vertical displacement measurement, and they could be complementary with one another. It was suggested to further improve the two methods developed and a successful outcome will not only help to solve an important problem for bridge management, but also prepare the way for better structural health monitoring techniques.

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26 citations in Scopus
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21 citations in Web of Science®

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ID Code: 20364
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: vertical displacement measurement, CCD camera, optical fiber sensors, FBG sensors, structural health monitoring
DOI: 10.1177/1475921708102108
ISSN: 1475-9217
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Urban Development
Copyright Owner: Copyright 2009 SAGE Publications
Deposited On: 07 May 2009 00:01
Last Modified: 29 Feb 2012 13:54

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