Process and device for the optical testing of a surface

Details Process and device for the optical testing of a surface Process and device for the optical testing of a surface

1996-03-22

1998-06-02

Pham, Hoa Q.

Optics: measuring and testing

By configuration comparison

With two images of single article compared

350237, G01B 1100

Patent

active

057609071

ABSTRACT:
A process and device for the optical testing of a surface in which the surface can be illuminated substantially from above by at least one upper light and from the side by at least one lower light, at a sharp angle with respect to the surface. The light reflected and/or scattered by the surface is recorded in a test period by at least one light-sensitive receiver and at least one actual image which is compared with at least one desired image is produced. To permit an improved test provision is made for the surface to be recorded by the light-sensitive receiver at least twice during the test period. During the recording periods in question the surface is illuminated by an at least intermittent illumination from above and/or from the side in a different manner in order to obtain at least two actual images with different illumination of the surface.

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"Laser-Scanner-Inspektionsystem", Kontrolle, pp. 9-14., 1987.

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