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Proceedings Paper

Proposal for a new thermographic nondestructive testing technique using microwave heating
Author(s): Takahide Sakagami; Shiro Kubo; Tatsuhito Komiyama; Hironobu Suzuki
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Paper Abstract

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.

Paper Details

Date Published: 19 March 1999
PDF: 5 pages
Proc. SPIE 3700, Thermosense XXI, (19 March 1999); doi: 10.1117/12.342324
Show Author Affiliations
Takahide Sakagami, Osaka Univ. (Japan)
Shiro Kubo, Osaka Univ. (Japan)
Tatsuhito Komiyama, Constec Engineering Co. (Japan)
Hironobu Suzuki, Chuken Consultant Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 3700:
Thermosense XXI
Dennis H. LeMieux; John R. Snell, Editor(s)

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