Method and apparatus for measuring deviations from flatness
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United States of America Patent
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-
Sep 20, 1988
Grant Date -
N/A
app pub date -
Mar 16, 1987
filing date -
Mar 16, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Deviations in flatness on a horizontal surface are measured by running over the surface, at a constant driven speed, an instrument sensitive to slope and which generates a continuous voltage signal corresponding to a continuous slope measurement. The continuous voltage signal is filtered to remove extraneous high frequency voltage signals thereby to produce raw continuous analog slope data which is digitized and calibrated to provide calibrated digital slope data from which other flatness data is computed. Procedures are described for calibrating the instrument and for eliminating or compensating for distortions in the measurements.
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