Development and validation of real-time capable reconstruction methods for quantitative active thermography for nondestructive testing of fiber-reinforced composites

该项目的目的是开发和验证快速有效的方法，从碳纤维增强复合材料的热像测量中重建缺陷。重建结果应不仅允许定位缺陷，而且还给出缺陷的几何特性的定量表征(例如，覆盖深度、分层程度、垂直于表面的损伤程度)。子目标产生于对最佳缺陷重建的贡献：-包括用于不同材料和缺陷参数以及不同加热过程(脉冲、锁定、猝发和几个进一步的时空强度图案)的大量测量数据--热传输的综合建模和模拟，允许宏观各向异性材料、不均匀的层结构，不同的时间加热强度和空间热流密度分布--基于PDE的识别方法的进一步发展和有效定量缺陷重建的快速启发式方法的发展

Aim of the project is the development and validation of fast and effective methods for defect reconstruction from thermographic measurements of carbon-fiber reinforced composites. The reconstruction results shall not only allow to locate defects, but also give a quantitative characterization of the geometric properties of the defect (e.g., depth of coverage, degree of delamination, extent of damage normal to the surface).The sub-goals arise from the contributions to an optimal defect reconstruction:- inclusion of a multitude of measurement data for different material and defect parameters and different heating procedures (impulse, lock-in, burst and several further spatio-temporal intensity patterns)- comprehensive modeling and simulation of heat transport, allowing for macroscopically anisotropic materials, inhomogeneous layer structure, different temporal heating intensities and spatial heat flux distributions- further development of PDE-based identification methods and development of fast heuristics for effective quantitative defect reconstruction