Abstract: A strain of a rotor (2) loaded with centrifugal force is measured, whereby the rotor (2) is introduced into a receiving part of a spin test rig (1) that can be connected to a drive, a camera (4) and a short-term illumination unit (6) are triggered, and at least one region of a surface of the rotor (2) is photographed. This first image is transmitted to an evaluation unit (8) as a starting state. The rotor (2) is accelerated and, at at least one rotational speed, the camera and the short-term illumination unit (6) are triggered again and at least one further image of the previously photographed region of the surface is photographed, which is transmitted to the evaluation unit (8) as a measuring state. The evaluation unit (8) calculates a strain of the rotor (2) in the photographed region of the surface using a digital image correlation, wherein the exposure time of the image sensor of the camera (4) is determined from the duration of the illumination coming from the short-term illumination unit (6).