Patent ID: 7359047
Filing Date: 2008-04-15
Classification: G01C

Abstract:
1. Device for checking or calibrating the angle-dependent alignment of a reference structure of a high-precision test piece, comprising a plinth a retainer part for retaining the test piece, the retainer part being mounted so as to be rotatable relative to the plinth about a retainer part axis and an angle of rotation of the retainer part about the retainer part axis between the plinth and the retainer part being measurable, a measuring part having a measuring part bearing unit for mounting the measuring part so as to be rotatable relative to the plinth about a measuring part axis intersecting the retainer part axis at right angles, an angle of rotation of the measuring part axis between the plinth and the measuring part being measurable, an optical unit having an optical detector and arranged on the measuring part in such a way that at least one test piece beam interacting with the reference structure of the test piece is detectable, which beam runs substantially in a plane through which the measuring part axis passes perpendicularly and in which the retainer part axis lies and which is intersected by a part of the measuring part and produces at least one point on the detector, and a control/regulation unit which is formed and connected in such a way that the optical unit can be automatically aligned by means of a motor relative to the reference structure of the test piece by means of motor-powered adjustment of the retainer part and of the measuring part as a function of the position of the at least one point on the detector, and the angle of rotation of the retainer part and the angle of rotation of the measuring part can be automatically determined, characterized in that the measuring part bearing unit is arranged on a single side of the measuring plane or in the measuring plane, and the measuring part has a basic shape which encompasses or encloses the point of intersection of the measuring part axis with the retainer part axis on the measuring plane and hence the test piece and is for a substantial part axially symmetrical with respect to the measuring part axis.