Haobo Cheng

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Polishing can be more uniform if the polishing path provides uniform coverage of the surface. It is known that Peano paths can provide uniform coverage of planar surfaces. Peano paths also contain short path segments and turns: (1) all path segments have the same length, (2) path segments are mutually orthogonal at the turns, and (3) path segments and turns(More)
This paper presents a shadow measuring method applicable to quantitatively assessing the local deformation of aspherical mirrors. The method calls for placing an image capture setup behind the traditional knife-edge testing device to record the resultant shadow maps. Local deformation of the surface of the work-piece under testing are then extracted from(More)
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