Non-destructive Detection and Mapping of Defect Zone of Stone Cultural Heritage Monument by Graduated Heating Thermography

Abstract eng:
Infrared thermography for stone cultural heritage monument mostly focused on the qualitative analysis to judge the location of defect zones up to present. This study carried out quantitative modeling for mapping of the blistering zone using the graduated heating thermography. To achieve these goals, the following steps were performed: acquisition of thermographic images by the passive and active methods, making the temperature distribution curve, establishment of the critical temperature and transitional zone, classifying the relative deterioration degree of the blistering zone, monochrome processing, vectorization, and deterioration evaluation. Analyzing the blistering deterioration degree of Magoksa Temple stone pagoda using the quantitative modeling, total area and average rate of blistering zones were calculated as about 2.6 m2 and 7.4%, respectively. The modeling will improve the reliability of deterioration map through mapping for blistering zone since most deterioration map has overlooked to mark the blistering zones.

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