Towards a new definition of areal surface texture parameters on freeform surface: Re-entrant features and functional parameters

Abstract Characterisation of freeform surfaces is an increasingly importance area of metrology. Currently the characterisation of surfaces is performed using data that can be represented by a height map. Modern measurement devices allow the acquisition of surfaces with complex shapes that cannot properly be analysed using the current texture parameters definition. In this paper a method to characterise both freeform surfaces and surfaces with re-entrant features is proposed. Two surface approximation methods are investigated: triangular mesh and Bezier surface. The proposed method will be compared with a method able to extract the ISO 25178-2 areal texture parameters from a triangular mesh.

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