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Abstract

A method for controlling a distance between a non-contact measurement probe head of a CMM and a work piece during a measurement. The method comprises providing steering commands to steer the work piece and/or the probe head through a measuring path comprising measuring positions, performing at a measuring position a measuring step comprising providing distance adjustment steering commands to set the distance between the probe head and the work piece, projecting a primary measuring beam pattern onto the work piece, acquiring a secondary measuring beam pattern originating from an interaction of the primary measuring beam with the work piece, deriving surface information based on the secondary measuring beam pattern, deriving information regarding the distance between the probe head and the work piece, deriving a distance deviation based on a distance target the derived distance information, providing the distance deviation for a distance adjustment performed at a subsequent measuring position.

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First Claim