列车门覆板-铝蜂窝脱粘缺陷的红外热像检测

Detection of debonding defect between cover plate and aluminum honeycomb of train door with infrared thermographic

为了检测列车门脱粘缺陷,采用红外热像获得覆板表面温度分布和变化规律。在物体表面温度-红外热波-红外热像理论的基础上分析了影响列车门脱粘缺陷红外热像质量的因素。实施了室内非稳态非接触穿透式加热方式列车门脱粘缺陷红外热像检测。实验中拍摄了180 s时长的试件热像,设置了脱粘区与无缺陷区内的平均温度之比作为特征值;获得了该特征值随时间变化的曲线。该特征值可用于列车门覆板-铝蜂窝脱粘缺陷红外热像检测,作为确定最佳检测时段和最佳检测温度的依据。

In order to detect the debonding defect in train door, the temperature distribution and variation on cover plate surface was obtained with the infrared thermal imaging. The factors affecting infrared thermograph quality of train door debonding defect were analyzed. The infrared thermograph detection for train door debonding defect was carried out indoor under a condition of heating, non static, non contact and penetrating way. The infrared thermograph video with a length of 180 s was gotten in the experiment. The ratio of the average temperature in debonding region to the av- erage temperature in non-defect region is set up as a criterion. The characteristic could be used to detect debonding defect between cover plate and aluminum honeycomb of the train door.