Proceedings PaperIn Process Optical Measurement Of Micro Profile On Cold Rolled Steel Plates
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A new sensor for measurement of micro profiles of fast running surfaces was developed, in which a fine Laser spot is created at the surface and the reflected light is received by photodiodes, arranged along an arc of 140 degrees perpendicular to the surface. These photodiodes are connected with resistors in the known manner of PSD's to realise an angle sensitive array to win the averaged angle of reflection of the asked surface-elements point by point. By calculating the local inclinations of these surface-elements and by integrating these values the micro profile is created, and by known calculations roughness parameters like Ra are determined. The distance of measuring points is 10 µm at a speed of the metal sheet up to 20 m/sec., thus the frequency of single measurements is 2 MHz. Results are shown and limitations are discussed.