Patent ID: 8256954

Claim:
A device for measuring operating parameters including temperature of a rotor of a high-speed rotary machine, the device comprising: at least one source of a magnetic field mounted on the rotor; at least one element of a magnetic material associated with the at least one source, said magnetic material having magnetic permeability substantially dependent on temperature within a range of interest for measurement and having a controlled Curie temperature higher than a maximum temperature to be measured; a magnetic field detector associated with a stationary part of the machine for generating a signal representation of magnetic flux induced by the at least one source onto the detector when the source passing in front of the detector; and electronic circuits for processing said signal and obtaining at least a datum on temperature therefrom, wherein said at least one element is aligned along a magnetic axis of the at least one source altering a shape of lines of force of the magnetic field generated by the at least one source corresponding to the temperature of the rotor, and wherein said at least one source and the at least one element with temperature-dependent magnetic permeability form a magnetic capsule axially or radially mounted on said rotor.