This work focusses on understanding and exploiting the optical reflectance behaviour of carbon fibre reinforced polymer composites for the non-destructive determination of fibre orientation and surface defects. By taking a series of images under different lighting conditions, fibre reflections have been isolated and MATLAB image analysis has been used to calculate the fibre orientations across the surface of the composite. An average peak method has been developed and validated against manual orientation measurements for two different applications: a machined scarf repair surface and a discontinuous fibre composite. The same experimental method and analysis code showed good results for both cases without modification, when at least 16 images with different directional lighting conditions are used. Hence, this low-cost approach can be applied to a diverse range of quality assurance and research applications where fibre orientations or other surface details need to be characterised.

中文翻译：

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利用碳纤维复合材料的光学反射行为进行低成本检测和取向分析

这项工作的重点是理解和利用碳纤维增强聚合物复合材料的光学反射行为，以无损地确定纤维取向和表面缺陷。通过在不同光照条件下拍摄一系列图像，隔离了纤维反射，并使用 MATLAB 图像分析来计算复合材料表面的纤维取向。已经针对两种不同应用开发了一种平均峰值方法，并针对手动定向测量进行了验证：机加工围巾修复表面和不连续纤维复合材料。当使用至少 16 张具有不同定向照明条件的图像时，相同的实验方法和分析代码在两种情况下都显示出良好的结果，无需修改。因此，