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Based on the results of the infrared thermography of 51 artificially created defects – voids and delaminations – in concrete, it was shown that it is possible to detect defects at depths that are equal or less than the defect size D using the thermal contrast method. By applying the phase contrast method, an increase of 50% in the maximum depth for a given defect size D was achieved. Delaminations...
The study here demonstrates the capability of thermography to detect and characterize pinhole defects in a visually transparent anti-reflection (AR) film. The diameter of the pin-holes varies from 0.03mm to 4mm. Each inspected area was unevenly heated for 65s. Thermal images were processed by the following steps: de-trend processing, primary edge detection based on Sobel approximation, and further...
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