It was found that this approach could enhance the visibility of inclusions over 50 micron and above. Thicknesses between two surfaces are computed with Cloud to Cloud, Mesh to Cloud and Hausdorff distance to enhance the visibility of inclusions. Using the portable laser scanner, the surfaces of each layer are scanned and compared the resulting point clouds using with a reference layer data. This paper proposes a 3D laser scanner-based approach for the detection of inclusion on flat and curved surfaces. Carrying out visual inspection is challenging as the layup is usually carried out on large surfaces and reflective by nature. The present method of finding the inclusions during the prepreg layup is by visual inspection in the cleanroom. During the fabrication process, the protective films of the prepregs or other materials used in the process could get inside as a foreign object between the layers. Among different manufacturing techniques available for composite aircraft structures, prepreg-based manual layup is widely used.
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