1 August 1997 Reconstructing a shadow pattern image of the internal surface of a small hole and estimating surface roughness from the image
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Abstract
A non-destructive method used to estimate internal surface roughness of a small hole (0.2 mm in diameter and 0.7 mm in depth) is described. The first step of this method is to reconstruct a shadow pattern image of the internal surface from a series of optically sectioned images of the surface. The surface roughness parameters are then calculated from this shadow pattern image. The method is verified by measuring a known flat surface and comparing the results with stylus measurements.
Zhige Zhang, Peter John Bryanston-Cross, David J. Whitehouse, "Reconstructing a shadow pattern image of the internal surface of a small hole and estimating surface roughness from the image," Optical Engineering 36(8), (1 August 1997). https://doi.org/10.1117/1.601442
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