Method and apparatus for surveying the surface of an object by projection of fringe patterns
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United States of America Patent
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-
Mar 26, 1991
Grant Date -
N/A
app pub date -
Jan 17, 1990
filing date -
Jan 17, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
For sensing the surface of an object, a number of gratings with linear line patterns of different periods on a common carrier are successively projected onto the surface. Images of the line patterns deformed at the object surface are detected and stored by a television camera and evaluated by an electronic circuit. The evaluation comprises computing, from the residual phases of the object points within each fringe of the linear pattern, the absolute heights of these points with respect to a common reference plane.
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Cited Art Landscape
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