A method for determining at least one movement variable of a rotating shaft, shaft examination and / or monitoring apparatus for its implementation and use thereof

A method for determining at least one movement variable of a rotating shaft (102) comprising the steps of a) using a camera-based measuring optical system (200) and b) determining the at least one movement variable by image processing and / or evaluation of captured by the camera-based optical measurement system images (601, 602), wherein step a) comprises the step a1) providing a reference pattern (202, having 302) having ring patterns from continuously changing, (by the camera-based measuring optical system 200) are each distinguishable from each other rings, wherein the distance between adjacent rings to one another changes depending continuously on the distance of the rings from the ring center.