激光红外热成像铝合金表面裂纹检测表面处理的研究

Study on surface treatment of laser infrared thermography aluminum alloy surface crack detection

通过搭建激光红外热成像检测平台,对已制备的铝合金光滑表面及表面处理后裂纹缺陷试样进行检测,对裂纹处的红外热图和温度数据进行分析,并且为了突出表面处理检测效果,用差动式检测方法对比在不同功率下表面处理前后温差变化。实验结果表明,随着功率的增大,裂纹缺陷表面处理前后的温差都存在温差增大的变化,但是表面处理后裂纹缺陷温差变化更加明显。相同功率条件下,裂纹缺陷表面处理后温差幅度远大于表面处理前的温差幅度。可见对激光红外热成像铝合金表面裂纹检测进行表面处理,明显提高其热吸收率,而且相较于表面处理前,经过表面处理后,所需更小的功率,就能取得更大温差,检测效果更好,可检测性更强。

By constructing laser infrared thermography inspection platform,the prepared aluminum alloy smooth surface and cracked samples after surface treatment were detected,and the infrared heat map and temperature data of the cracks were analyzed.In order to highlight the surface treatment detection effect,The differential detection method compares the temperature difference before and after the surface treatment at different powers.The experimental results show that with the increase of the power,the temperature difference between the crack defect surface before and after the surface treatment changes,but the temperature difference of the crack defect after the surface treatment changes more significantly.Under the same power condition,the temperature difference amplitude of crack defect surface treatment is much larger than that before surface treatment.It can be seen that the surface treatment of aluminum alloy surface crack detection by laser infrared thermography significantly improves its heat absorption rate.Compared with the surface treatment,after the surface treatment,it requires less power and can obtain a larger temperature difference.The effect is better and the detectability is stronger.