STRAIN MEASUREMENT OF ROTATING COMPONENTS

摘要

A strain sensor apparatus (40) for a rotatable shaft (34) comprising an emitter/receiver (42), a vibration element (44) attached to the shaft (34) and arranged for receiving and reflecting signals to and from the emitter /receiver (42) characterised in that the vibration element (70) comprises asymmetric stiffness properties between a radial and axial and/or circumferential directions relative to a rotational axis of the shaft.