Patent ID: 8031334

Claim:
A method for determining at least one influencing variable acting on the eccentricity in a goniometer, the goniometer including a support element with a detector arrangement comprising at least one optical detector element, the detector arrangement having a detector center, the goniometer further including a rotational body having a multiplicity of pattern elements arranged around a pattern center, the rotational body being arranged so as to be rotatable about an axis relative to the support element, the method comprising: mapping of at least a part of the pattern elements onto the detector arrangement; resolving the positions of the pattern element mapped on the detector arrangement; and measuring the eccentricity of the pattern center relative to the detector center, wherein: a multiplicity of eccentricity measurements is performed for different rotational positions; and at least one influencing variable acting on the eccentricity is separated from the multiplicity of eccentricity measurements.