Foucalt current detection with a rotating magnetic field. - Uses rotating magnetic field to induce currents in a conducting structure such as heat exchanger tubes.

摘要

The rotating magnetic field generator has a transmitter winding with axially wound coils and a receiver winding whose coils are wound over the transmitter axially displaced coils An alternating electrical supply is connected to the transmitter winding and a rotating magnetic field is produced in the axial displace phase shifted coils. This field is applied to the conducting material under test and Foucalt currents are produced in the test material. These currents are detected by the receiving windings USE/ADVANTAGE Provides means for inspection of heat exchanger tubes in nuclear installations.