Electromagnetic method of the angular displacement monitoring

An apparatus for monitoring angular displacement in a rotation plane about a rotation axis of a moving part, comprising:

• at least one electrodynamic profile 1 for electric and magnetic fields mounted on the moving part 2 the displacement of the part 2 which is to be monitored,
• at least one resonator 4, including at least one matching plug 5, and a measuring circuit 6, including at least one radio frequency generator 7, at least one primary transducer 8 and a converter 9 converting and comparing electric signals into the parameter of angular displacement,
• said resonator including at least one section of a sensitive slow-wave structure set to distribute in a given ratio the components of an electric and magnetic fields in the electrodynamic profile, and connected to said matching plug;
• said sensitive slow-wave structure further including at least two conductors, at least one of said conductors being an impedance conductor facing said electrodynamic profile.