Method and apparatus for calibrating and improving linearity...

G - Physics – 01 – N

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G01N 37/00 (2006.01) G01N 21/89 (2006.01) G01N 21/90 (2006.01) G02B 26/12 (2006.01) G02B 27/00 (2006.01)

Patent

CA 2120711

2120711 9309462 PCTABS00022 A method for calibrating and improving linearity of system for scanning moving objects. A type of scanning system, a set of parameters to define the scanning system are selected. A set of initial values for some of the parameters are also selected and Mathematical equations are derived which describe physical movements of the scanning and relationships between the parameters. The equations are solved to find values for the parameters with which the objects are scanned by an incident light with linearity and a predetermined accuracy. The parameters of the scanning system are then set to the values obtained by solving the equations. The system itself consists of the rotating polygon (34) and a rotating carousel (42) having predetermined axes of their rotation. The polygon (34) has a plurality of facets (46) which are symmetric with respect to the polygon's axis of rotation. The carousel supports objects, such as bottles (36, 37...41) which also may have spinning motions. The system may operate in a reading mode when objects areilluminated by an incident light beam which is reflected and is directed to a processing unit, or in a writing mode when the surfaces of the objects are treated, e.g., by a laser beam for engraving marks while the objects are moved by the carousel (42) and spin around their own axes.

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