Structured illumination surface profiling and ranging systems and methods
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United States of America Patent
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-
Aug 14, 1990
Grant Date -
N/A
app pub date -
Jun 27, 1988
filing date -
Jun 27, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Range and/or profile of a test surface, particularly a submarine surface, are determined by passing a laser beam through a holographic grating structured to emit a divergent light beam defining a two dimensional array of dots in a predetermined pattern and projecting such beam on the test surface. A receiving device, e.g., video camera, ascertains the positions of the dots in the pattern reflected from the test surface and comparison is made of such positions relative to the positions of the respective dots previously reflected in like manner from a datum surface. The values of the displacements of test surface dots from datum surface dots are used to determine the range or orientation of the test surface relative to the grating or the profile of the test surface.
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