Thermal Influence on Long-Distance Optical Measurement of Suspension Bridge Displacement
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This paper discusses the thermal influence on long-distance and noncontact measurement of suspension bridge three-dimensional displacement by the use of an optical system composed of a digital camera, infrared active targets, and computational support. In this type of measurement method, the optical propagation path of light through the air can range from 250 m up to 750 m, making its measurement accuracy strongly dependent on atmospheric refraction and turbulence, phenomena that are linked to the vertical temperature gradient between the camera and targets. In addition, the adopted measurement geometrical configuration can lead to a height difference between these two elements (camera and targets) above 50 m. The paper describes the experimental setup and procedure followed for the determination of local temperature vertical gradients in the 25th of April Bridge in Lisbon (Portugal), where an optical measurement system was applied. The obtained thermal measurements are presented and applied in the evaluation of the systematic refraction vertical deviation, based on appropriate mathematical models mentioned in the paper, and for the identification of stable or unstable observation thermal conditions related to turbulence.
KeywordsDisplacement Optical system Suspension bridge Temperature
The authors gratefully acknowledge the company EP—Estradas de Portugal, S.A. who authorized and supported the experimental work performed on the 25th of April Bridge and to the Colleagues of the Scientific Instrumentation Centre of LNEC that provided experimental assemblies and technical support. The anemometers used in the experimental work were gently provided by Dr. Marques da Silva from LNEC’s Aerodynamic Sector. The author L. Lages Martins also acknowledges the award of a joint doctoral scholarship from the FCT—Fundação para a Ciência e a Tecnologia, I.P. and LNEC—Laboratório Nacional de Engenharia Civil, I.P.
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