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Principal component thermography for flaw contrast enhancement and flaw depth characterisation in composite structures

机译:主成分热成像技术,用于增强复合结构中的缺陷对比和缺陷深度表征

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摘要

This study reports on the application of principal component thermography to the nondestructive inspection of composite structures. The technique is based on a singular value decomposition of the measured response to pulsed thermal excitation as applied in the course of a normal flash thermographic inspection. Trials on synthetically generated data show evidence of excellent noise-rejection qualities which manifest high levels of flaw contrast relative to that present in the unprocessed data. A simple analytical expression is then derived that relates a characteristic time furnished by the decomposition to the flaw depth, providing a basis for flaw depth estimation. This framework is shown to provide flaw-depth estimates with good levels of precision and robustness. Finally, application to experimental data is considered. An AS4/3501 composite laminate sample containing an assortment of teflon inserts is subject to active thermographic inspection and the response data analysed using the proposed approach. The results conclusively demonstrate the practical efficacy of the approach, and confirm the attractive properties outlined in relation to the numerical tests.
机译:这项研究报告了主成分热成像技术在复合结构的无损检测中的应用。该技术基于在常规闪光热成像检查过程中应用的对脉冲热激发的测量响应的奇异值分解。对合成生成的数据进行的试验表明,具有出色的噪声抑制质量,与未处理的数据相比,它具有较高的缺陷对比度。然后导出一个简单的解析表达式,将分解提供的特征时间与缺陷深度相关联,为缺陷深度估计提供基础。可以看出,该框架可提供具有良好水平的精确度和鲁棒性的缺陷深度估计。最后,考虑将其应用于实验数据。包含各种聚四氟乙烯插入物的AS4 / 3501复合层压板样品将接受主动热成像检查,并使用所提出的方法分析响应数据。结果最终证明了该方法的实际有效性,并证实了与数值测试有关的诱人特性。

著录项

  • 来源
    《Composite Structures》 |2002年第4期|p.521-528|共8页
  • 作者

    N. Rajic;

  • 作者单位

    Aeronautical and Maritime Research Laboratory, Defence Science and Technology Organisation, 506 Lorimer Street, Fishermens Bend, VIC 3207, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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