<title>Proposal for a new thermographic nondestructive testing technique using microwave heating</title>

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A new nondestructive testing method is proposed for the detection of cracks in concrete structures. This method is based on temperature measurement using infrared thermography under microwave heating. Cracks to be detected in concrete structures are usually surface-breaking, and water can penetrate into cracks. When microwave is applied to the concrete structure with wet cracks, water in the cracks can be selectively heated by microwave. In this case temperature distribution around the crack is expected to show the similar distribution as that of the linear heat sources. Thus cracks can be detected from the thermal images measured immediately after the microwave application. Preliminary experimental investigation was carried out for a mortar-block specimen with artificial cracks using a microwave oven. It was found that cracks can be detected from the thermal images, in which wet cracks were selectively heated by microwave.© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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