Method of and an apparatus for testing large area panes for optical quality
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United States of America Patent
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-
Jul 7, 1992
Grant Date -
N/A
app pub date -
Aug 23, 1990
filing date -
Sep 2, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of testing large area panes of a transparent material for optical quality, especially automotive windshield, uses a light box having a uniformly illuminated wall along which a planar grating is provided. The grating has an area at least equal to that of the windshield which is spaced from that gravity. An objective in line with the windshield and the grating forms an image of the grating through the windshield on a plane having a reference grating of much smaller size to form a Moire-pattern superposition which is picked up by a video camera and subjected to phase shift analysis.
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