Methods and apparatus for retroreflective surface inspection and

Details Methods and apparatus for retroreflective surface inspection and Methods and apparatus for retroreflective surface inspection and

1991-09-26

1993-04-27

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

356445, G01N 2188

Patent

active

052067009

ABSTRACT:
A method for creating a retroreflective image of a surface (or transparent medium) is provided where the retroreflective image is produced by illuminating an area of the surface with light which is reflected therefrom to a retroreflector which returns this light to the surface area. At the surface area, the retroreflected light is then reflected again and imaged to thus form the retroreflected image. In one embodiment, a broad light source is used to image a secondary image of the surface. In another embodiment, the light field produced by the surface is larger than the retroreflective element or group of elements which are then moved. In still another embodiment, a single retroreflective element is used together with a divergent light source.

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