Infrared Thermography in Building Assessment

• Main Authors: Tzu-yang Cheng, 鄭子揚
• Other Authors: Chih-hung Chiang
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/78417531614073201240

碩士 === 朝陽科技大學 === 營建工程系碩士班 === 93 === Infrared thermography is an efficient tool for surface temperature measurement. In principle, heat transfer in any material is affected by the change in material thermal properties. Localized temperature differences on the surface, which may be caused by the subsurface defects, can be found based on the images produced by an infrared camera. The objective of the current research is to explore the applications of infrared thermography on the building assessment. Three concrete slabs with embedded defects were fabricated. Trials of different inspection procedures were carried out such that the heating time and cooling duration can be optimized for clear thermal images. Furthermore, numerical simulation based on finite-difference formulations indicated that the surface temperature differences are strongly affected by the thickness of both the defect and the concrete cover. The conclusions drawn from results of trial inpection and those of numerical simulation are as the following. The difference in surface temperature increases as the defect area or the heating time increases. The difference in surface temperature as the thickness of concrete cover increases.