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Active infrared thermographic inspection technique for elevated concrete structures using remote heating system
Authors:Koichi Kurita  Michiaki Oyado  Hisashi Tanaka  Seiichi Tottori
Institution:aDepartment of Electrical Engineering, Kochi National College of Technology, 200-1 Monobe-Otsu, Nankoku, Kochi 783-8508, Japan;bRailway Technical Research Institute, 2-8-38 Hikari-cho, Kokubunji-shi, Tokyo 185-8540, Japan;cJR Soken Engineering Co., Ltd., 1-39-23 Hikari-cho, Kokubunji-shi, Tokyo 185-0034, Japan
Abstract:Conventionally, the inspection of elevated concrete structures requires the use of scaffolding or an aerial truck. In this study, elevated railway structures constructed of reinforced concrete were inspected using active infrared thermography. The inspection area corresponded to half of the middle slab covering an area of 16.8 m2; one inspection was carried out that took about 15 min. A remote heating system consisting of a 6-kW air-cooled xenon arc lamp and a scanner system was developed to detect hidden defects in elevated concrete structures without the need for an aerial truck or scaffolding. The generation of a thermal image and irradiation are carried out simultaneously by the beam scanning. High-contrast infrared thermal images can be obtained by the simple image processing procedure that is proposed.
Keywords:Infrared thermography  Hidden defect  Non-destructive testing  Elevated concrete structure  Civil engineering
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