Optical measurement system applied to continuous displacement monitoring of long-span suspension bridges

L. Lages Martins; J. M. Rebordão; A. Silva Ribeiro

doi:10.1117/12.2019996

13 May 2013 Optical measurement system applied to continuous displacement monitoring of long-span suspension bridges

L. Lages Martins, J. M. Rebordão, A. Silva Ribeiro

Proceedings Volume 8788, Optical Measurement Systems for Industrial Inspection VIII; 87882M (2013) https://doi.org/10.1117/12.2019996
Event: SPIE Optical Metrology 2013, 2013, Munich, Germany

Abstract

This paper provides a general description of main issues related to the design of an optical measurement system applied to continuous displacement monitoring of long-span suspension bridges. The proposed system’s architecture is presented and its main components - camera and active targets - are described in terms of geometrical and radiometric characteristics required for long distance measurement of the tridimensional displacement of the stiffness girder in the middle section of the bridge’s central span. The intrinsic and extrinsic camera parameterization processes, which support the adopted measurement approach, are explained in a specific section. Since the designed measurement system is intended to perform continuous displacement monitoring in long distance observation framework, particular attention is given to environmental effects, namely, refraction, turbulence and sensor saturation phenomena, which can influence the displacement measurement accuracy. Finally, a measurement uncertainty method is discussed in order to provide a suitable solution for the determination of the accuracy related to the proposed measurement approach.

Citation Download Citation

L. Lages Martins, J. M. Rebordão, and A. Silva Ribeiro "Optical measurement system applied to continuous displacement monitoring of long-span suspension bridges", Proc. SPIE 8788, Optical Measurement Systems for Industrial Inspection VIII, 87882M (13 May 2013); https://doi.org/10.1117/12.2019996

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KEYWORDS

Cameras

Bridges

Optical testing

Optical design

Refraction

Turbulence

Imaging systems

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