Rough object distance measurement and fringe localization using focus measures
Abstract
A high-resolution technique for distance measurement of rough objects by evaluation of fringe localization using focus measures is demonstrated experimentally. Dual-illumination digital holographic interferometry is used to generate phase difference maps (PDMs) of a rough test object. Focus measure values of the PDMs along the axial direction (increment: 10λ = 6.33 μm) yield an inverted bell-shaped curve which, in turn, facilitates the characterization of the plane and region of fringe localization and, subsequently, the localization of the rough object. The technique can be extended to applications that require fully automated control of fringe visibility.
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