Sensor for contactless optical measurement of relative velocity of material surface using detection of moving light pattern directed onto material surface via illumination device with controlled light sources

摘要

The sensor (10) has an illumination device (16) with a number of separately controlled light sources, e.g. LED's, for illuminating the material surface (12) with a moving light pattern and a viewing device (18), e.g. a CCD sensor array, for detection of brightness values from the material surface, evaluated for determining the material surface relative velocity. Independent claims are also included for: (a) a device for measuring the relative velocity of a material surface; and (b) a method for measuring the relative velocity of a material surface.