Patent ID: 11892469
Assignee: ROSEMOUNT AEROSPACE INC.
Field: Measurement (Instruments)
Classification: CPC G  F | IPC F  G

Claim 17:
18. A method for a sensing rotation frequency of a rotatable member and for monitoring health thereof, the method comprising:
generating, via a magnet, a magnetic field proximate the rotatable member;
causing, via rotation of the rotatable member, changes in the magnetic field generated by the magnet;
positioning first and second inductive coils proximate the rotatable member so as to sense changes in the magnetic field;
inducing, via the changes in the magnetic field sensed, coil currents within each of the first and second inductive coils;
generating, in response to the coil currents induced, signals indicative of the rotation frequency of the rotatable member;
generating, via a radio-frequency signal generator coupled to the first inductive coil, an electrical signal that, when conducted by the the first inductive coil, radiatively transmits an electromagnetic signal;
receiving, via the second inductive coil, the electromagnetic signal radiatively transmitted by the first inductive coil; and
determining, via a speed-probe monitor and based on the electromagnetic signals received, health of each of the first and/or second inductive coils.