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18 June 2007 Fiber optic-based sensors design to test concrete structures
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There are a lot of factors that call into question the integrity, safety and reliability of concrete macrostructures such as bridges, buildings, tunnels and dikes. Examples of such factors are humidity variations, in-excess load supported during years, vibrations and pH variations, which can damage the concrete structure after extended periods. In order to test the real state of such structures, we present the design and development of fiber optic based sensors that permit the measurement of loads and tensions applied to the structure, just as both the humidity and pH of the concrete at the measurement point. The load of the structure can be measured by means of fiber Bragg grating techniques, which involves wavelength multiplexing and optical spectrum analysis, and the humidity and pH measurements are achieved by incorporating different types of hydrogels to the nearness of the fiber Bragg grating. The change in humidity and pH produces volume changes in these hydrogels that modify the spectral response provided by the fiber Bragg grating. Thus, it is possible to place multiple sensors along the macrostructure to visualize the on-line status during its life time.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
V. Micó, M. L. Lozano, J. J. Esteve-Taboada, J. A. Carrión, T. Molina-Jiménez, S. Simón, E. Pérez, J. M. Lloris, M. Cruz-Yusta, M. J. López-Tendero, C. Silvestre, F. López, D. Barrera-Villar, R. García-Olcina, and S. Sales "Fiber optic-based sensors design to test concrete structures", Proc. SPIE 6616, Optical Measurement Systems for Industrial Inspection V, 66163C (18 June 2007);

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