Method and apparatus for measuring deviations from flatness

Details Method and apparatus for measuring deviations from flatness Method and apparatus for measuring deviations from flatness

G - Physics

01

B

354/25

G01B 7/28 (2006.01) G01B 7/34 (2006.01)

Patent

CA 1295420

ABSTRACT OF THE DISCLOSURE 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. Th 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.

551611

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