Methods and apparatus for retroreflective surface inspection and distortion measurement
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United States of America Patent
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Apr 27, 1993
Issued Date -
N/A
app pub date -
Sep 26, 1991
filing date -
Mar 14, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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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