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Comparative defect evaluation of aircraft components by active thermography

机译：主动热成像技术比较飞机零件的缺陷

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Active Thermography has become a powerful tool in the field of non-destructive testing (NDT) in recent years. This infrared thermal imaging technique is used for non-contact inspection of materials and components by visualizing thermal surface contrasts after a thermal excitation. The imaging modality combined with the possibility of detecting and characterizing flaws as well as determining material properties makes Active Thermography a fast and robust testing method even in industrial-/production environments. Nevertheless, depending on the kind of defect (thermal properties, size, depth) and sample material (CFRP carbon fiber reinforced plastics, metal, glass fiber) or sample structure (honeycomb, composite layers, foam), active thermography can sometimes produce equivocal results or completely fails in certain test situations. The aim of this paper is to present examples of results of Active Thermography methods conducted on aircraft components compared to various other (imaging) NDT techniques, namely digital shearography, industrial x-ray imaging and 3D-computed tomography. In particular we focus on detection limits of thermal methods compared to the above-mentioned NDT methods with regard to: porosity characterization in CFRP, detection of delamination, detection of inclusions and characterization of glass fiber distributions.
机译：近年来，主动热成像技术已成为无损检测（NDT）领域的强大工具。通过可视化热激发后的热表面对比度，这种红外热成像技术可用于材料和组件的非接触式检查。成像方式加上检测和表征缺陷以及确定材料特性的可能性，使主动热成像技术即使在工业/生产环境中也成为一种快速而强大的测试方法。但是，根据缺陷的种类（热性质，尺寸，深度）和样品材料（CFRP碳纤维增强塑料，金属，玻璃纤维）或样品结构（蜂窝状，复合层，泡沫），主动热成像有时可能会产生模棱两可的结果或在某些测试情况下完全失败。本文的目的是提供与各种其他（成像）NDT技术（即数字剪切成像，工业X射线成像和3D计算机断层扫描）相比，在飞机部件上进行主动热成像方法的结果的示例。与上述NDT方法相比，我们特别关注以下方面的热学方法检测极限：CFRP中的孔隙率表征，分层检测，夹杂物检测和玻璃纤维分布表征。

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