Optical measurement and inspection of rebar rods or the like

Details Optical measurement and inspection of rebar rods or the like Optical measurement and inspection of rebar rods or the like

G - Physics

01

B

G01B 11/00 (2006.01) G01B 11/10 (2006.01) B21B 38/04 (2006.01)

Patent

CA 2350160

The invention relates to a method and an arrangement for optically detecting the measurements, in particular the diameters, of a long object during or after its production, which object moves forward continuously at high speed in lengthwise direction. With this method, one light beam intersects with the object at a measuring location at a flat angle (.alpha.) and a second light beam intersects with the object at the same measuring location at a flat angle (.beta.) and the shadows formed in the process are detected. The light beams are offset relative to each other in the cross-sectional plane that extends perpendicular to the longiludinal axis of the object by a specifie angle (.gamma.), and ihe angle (.alpha.) corresponds to the angle (.beta.) and perferably measures 10 to 40 °, in particular essentially 20°.

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