Patent ID: 6556945
Filing Date: 2003-04-29
Classification: B61L,G01B,G01N

Abstract:
A method for measuring unevenness formed by grooves and/or long waves in a surface of an object by using a measuring platform, comprising:moving an object and a measuring platform relative to each other; projecting from the measuring platform a light streak that extends in a direction of the movement onto the surface of the object at a fixed projection angle that is tilted relative to a normal to the surface; reproducing the light streak on a planar, position-sensitive photo receiver with a plurality of successive instantaneous exposures of the photo receiver, where the photo receiver is fixedly arranged on the measuring platform with a recording angle that is tilted relative to the fixed projection angle; recording the surface along the direction of the movement with a plurality of continuous light-streak images; and determining a surface profile of the surface along the direction of the movement from deformations in the plurality of the light-streak images.