Patent ID: 7299556

Claim:
Method for checking or calibrating the angle-dependent alignment of a reference structure of a high-precision test piece, using a device comprising an adjustable or fixed retainer part for retaining the test piece an adjustable measuring part, the measuring part and the retainer part being rotatable relative to one another about a retainer part axis and a measuring part axis intersecting the retainer part axis at right angles, and an angle of rotation of the retainer part about the retainer part axis and an angle of rotation of the measuring part about the measuring part axis between the measuring part and the retainer part being measurable, an optical unit arranged on the measuring part and having an optical detector for receiving at least one test piece beam which interacts with the test piece and runs substantially in a measuring plane, through which the measuring part axis passes perpendicularly and in which the retainer part axis lies, and produces at least one point on the detector, and a control/regulation unit at least for the motor-powered alignment of the optical unit relative to the reference structure of the test piece by means of motor-powered adjustment of the axis of rotation of the retainer part and of the axis of rotation of the measuring part as a function of the position of the at least one point on the detector comprising the method steps arrangement of the test piece on the retainer part, preliminary alignment of the optical unit and/or of the reference structure of the test piece so that the test piece beam at least partly strikes the detector and produces at least the one point there, evaluation of the position of the at least one point on the detector by the control/regulation unit, relative fine alignment of the optical unit relative to the reference structure by means of the control/regulation unit as a function of the position of the at least one point on the detector so that the at least one point reaches a certain reference position on the detector and determination of at least the angle of rotation of the retainer part and/or of the angle of rotation of the measuring part, radiation being produced by the reference structure of the test piece or being modified with respect to a radiation parameter, in particular by reflection, stopping, filtration or shaping, and the produced or modified beam forming the test piece beam.