Optical gauging apparatus
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United States of America Patent
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-
Oct 15, 1991
Grant Date -
N/A
app pub date -
Sep 5, 1990
filing date -
Sep 21, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical gauging apparatus utilizing a light projected toward an object to be gauged and reflected on the object to gauge a distance to the object or an amount of change occurring in the object. The gauging apparatus includes light projecting elements adapted to project two light beams from first and second light sources or split from the light of a single light source toward the object so that these two light beams provide the object with respective different luminance characteristics thereon, a light receiving member adapted to receive the light reflected on the object, and a signal processor adapted to calculate a ratio of different luminances for the two light beams from the ouptut of the light receiving member and thereby to output an information on the gauged result.
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