Inspection Method of Cracks in Concrete by Using Infrared Camera

建立混凝土结构裂缝检测方法具有十分重要的意义。为了探索遥控检测的方法，本文进行了以下研究：(1)用改进的焊铜加热混凝土试件的一小部分，并用红外摄像机记录其导热行为。用红外加热器对试件进行红外线照射，用红外热像仪测量裂纹表面的反射光。在热分布照片中可以看到裂缝，因为红外线不会在裂缝处反射。实验结果表明，在红外相机到试件的距离为6.0-10m的条件下，可以记录到0.2 mm宽的小裂纹

It is very immportant to establish the inspection method of cracks in concrete structure. In order to investigate the inspection method by remote control, the following study was carried out in this paper.(1) A small part of the concrete specimen was heated with an improved soldering copper and by using the infrared camera the heat conduction behavior was recorded. the position of cracks could be found by checking up the disturbance of heat distribution.(2) Infrared rays were applied to the specimen with the infrared heater and the reflected rays from the crack sueface were measured by the infrared cameta. The cracks can be seen in the heat distribution photograph, since the infrared rays do not reflect at the cracks. As the result of the tests, the small cracks 0.2mm in width could be recorded, under the condition when the distance from the infrared camera to the specimen was 6.0-10m