Abstract
Experimental investigations on the construction of real railway structures using reinforced concrete are performed by using the active infrared thermography technique. A remote heating system consisting of an air-cooled 6 kW xenon arc lamp and a scanner system is developed. The heating system can be used to detect hidden defect in the concrete structure at depths less than 30 mm; for the detection, an irradiation with an energy density of 0.92 kJ/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . Results obtained from the experiments show that the proposed method provides better performance than conventional passive infrared thermography, irrespective of the weather conditions.
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