Method and apparatus for measuring the three-dimensional...

Optics: measuring and testing – Shape or surface configuration – Triangulation

Reexamination Certificate

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Reexamination Certificate

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06873421

ABSTRACT:
An apparatus and method for measuring a three-dimensional shape of an object using a projection moiré device. The method comprises the steps of obtaining a grid pattern image projected on a reference plane of a moving table and applying a buckets algorithm thereto, thereby achieving a reference phase, obtaining a grid pattern image projected on the object set on the moving table and applying a buckets algorithm thereto, thereby achieving an object phase, calculating a difference phase between the object phase and the reference phase, thereby achieving a moiré phase, and unwrapping the moiré phase, thereby achieving a level information of the object. The apparatus and method measure the three-dimensional shape using a projection grid without a reference grid, thereby achieving compactness of equipment, simplicity in usage and manufacturing cost reduction.

REFERENCES:
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patent: 5668631 (1997-09-01), Norita et al.
patent: 5714832 (1998-02-01), Shirrod et al.
patent: 5847832 (1998-12-01), Liskow et al.
patent: 6075605 (2000-06-01), Futamura et al.
patent: 6731391 (2004-05-01), Kao et al.
patent: 2001-29190 (2001-04-01), None

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