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Verfahren und Vorrichtung zur Erfassung von Formabweichungen an Objekten

Determining shape deviations of objects, especially objects with diffusely reflecting surfaces.
 
: Aswendt, P.; Hoefling, R.

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Frontpage ()

DE 1998-19821059 A: 19980511
DE 1998-19821059 A: 19980511
DE 19821059 C2: 20020919
G01B0011
Deutsch
Patent, Elektronische Publikation
Fraunhofer IWU ()

Abstract
DE 19821059 A UPAB: 20000124 NOVELTY - The method involves projecting a series of sinusoidal strips, displaced in gray scale distribution on a screen, which is inclined to the object surface and photographing the intensity distribution of the image series. The image is evaluated using interferometry and phase reconstruction. DETAILED DESCRIPTION - The method involves projecting a series of sinusoidal strips, displaced in gray scale distribution, on a screen (2), which is aligned at the object surface (4) such, that the object surface normals lie at least approximately on an angle bisecting line between a straight line connecting the object and the screen and a straight line connecting the object and a camera (3). The camera photographs the occurring intensity distribution of the image series and an evaluation unit (6), using interferometry and phase reconstruction, produces an image of surface inclination or surface curvature. USE - Determining shape variations of object. ADVANTAGE - Determines shape deviations also of objects with diffuse reflecting surfaces. Provides vertical resolution of at least 1/500,000 of horizontal object extension, with identification or detection.

: http://publica.fraunhofer.de/dokumente/PX-63358.html