Patent ID: 8209137

Claim:
Method for contactless determination of forces and/or moments acting on a hollow cylindrical body ( 12 ), comprising by means of a light source ( 20 ; 38 ; 40 ), light radiation is produced within the hollow cylindrical body ( 12 ); measurement signals of the light radiation are recorded by means of an optoelectronic sensor ( 22 ; 34 ); the measurement signals recorded by the optoelectronic sensor ( 22 ; 34 ) are supplied to a signal processing unit ( 26 ); the signal processing unit ( 26 ) detects and outputs changes of the measurement signals relative to an initial state determined beforehand by calibration, corresponding to an initial undeformed state of the hollow cylindrical body ( 12 ); when a mechanical deformation of the hollow cylindrical body ( 12 ) is present, according to a calibration function or a calculation rule, the signal processing unit ( 26 ) outputs an output signal that describes the forces and/or moments that are causing the mechanical deformation of the hollow cylindrical body ( 12 ).