Patent ID: 7180607
Filing Date: 2007-02-20
Classification: G01S

Abstract:
1. A method for calibrating a measuring system comprising a measuring device with a laser tracker and an opto-electronic sensor having fixed positions relative to one another, an auxiliary measuring tool and a system computer, wherein the auxiliary measuring tool comprises one reflector or more than one reflector for reflecting a measuring beam directed on to said one reflector or more than one reflector by the laser tracker and at least three light spots to be registered by the opto-electronic sensor and being arranged in a known light spot arrangement, the method comprising the steps of: when said auxiliary measuring tool comprises fewer than three reflectors, coupling the auxiliary measuring tool to an arrangement of auxiliary reflectors such that the total number of reflectors is at least three, moving the auxiliary measuring tool, alone or together with the arrangement of auxiliary reflectors, around at least two rotation axes, said at least two rotation axes being different relative to the auxiliary measuring tool, registering, in at least two rotation positions for each one of the at least two rotation axes, measured data regarding the total of at least three reflectors and, auxiliary reflectors with the laser tracker and measured data regarding the at least three light spots with the opto-electronic sensor, calculating from the measured data of the laser tracker positions and orientations of the reflector arrangement relative to the laser tracker and from the measured data of the opto-electronic sensor positions and orientations of the light spot arrangement relative to the opto-electronic sensor, calculating from the positions and orientations of the two arrangements the at least two rotation axes relative to the reflector arrangement and the at least two rotation axes relative to the light spot arrangement, and calculating calibration data by equating corresponding rotation axes of the two arrangements and storing the calibration data in the system computer.