红外热像法检测建筑外墙饰面层内部缺陷试验研究

发布时间：2018-03-29 04:23

本文选题：建筑外墙饰面层　切入点：红外热成像技术　出处：《土木工程学报》2014年06期

【摘要】：利用红外热像仪对建筑外墙饰面砖饰面层内部缺陷进行检测试验,研究饰面层在太阳辐射下的表面温度随时间、空间的分布及变化规律,分析内部缺陷的厚度、大小、饰面砖颜色以及红外热像仪的竖向拍摄角度和发射率等因素对红外热成像效果的影响。试验结果表明,厚度越大、面积越大的内部缺陷越容易被检测出;存在内部缺陷的深色饰面砖缺陷部位与完好部位间的表面温差较浅色的明显偏高;沿内部缺陷宽度方向的饰面层表面温度关于其中心最大温度点呈近似对称关系;饰面层表面温度随着红外热像仪竖向拍摄角度和发射率的增大而减小,但不同拍摄角度下同一路径上的表面温度-位置曲线近似平行。基于试验结果,提出红外热像法检测饰面砖饰面层内部缺陷大小的估算方法,并建立了缺陷面积的估算公式,可供后续相关研究及实际工程应用参考。
[Abstract]:In this paper, the infrared thermal imager is used to detect the inner defects of the exterior wall brick veneer layer, to study the distribution and variation of the surface temperature with time and space under solar radiation, and to analyze the thickness and size of the inner defect. The influence of the color of the finishing brick and the vertical shooting angle and emissivity of the infrared thermal imager on the infrared thermal imaging effect. The experimental results show that the larger the thickness, the larger the area, the more easily the internal defects can be detected. The surface temperature difference between the defect part and the intact part of the dark decorative brick with internal defects is obviously higher than that of light color, and the surface temperature of the decorative layer along the direction of the width of the inner defect is approximately symmetrical with respect to the maximum temperature point of its center. The surface temperature of the finishing layer decreases with the increase of the vertical shooting angle and emissivity of the infrared thermal imager, but the surface temperature-position curves on the same path at different shooting angles are approximately parallel. This paper presents an estimation method of the inner defect size of the decorative brick veneer by infrared thermal image, and establishes the estimation formula of the defect area, which can be used as a reference for the subsequent research and practical engineering application.
【作者单位】：武汉大学;甘肃省建设投资(控股)集团总公司;甘肃省建筑科学研究院;
【基金】：甘肃省科技支撑计划(1104GKCA053)
【分类号】：TU746.2

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