Phonic seal seat

A method of measuring a rate of rotation of a seal plate in a gas turbine engine, the method comprising:

• rotating the seal plate, wherein the seal plate comprises:
• an annular body;
• a scoop connected to and extending radially from the annular body, wherein the scoop defines an annulus, wherein the scoop is disposed on a first axial end of the annular body;
• a sealing surface disposed on a second axial end of the annular body opposite from the scoop;
• a plurality of teeth disposed into and along an outer perimeter of a portion of the annular body;
• and
• a channel extending through a portion of the annular body, wherein the channel is fluidly connected to the scoop and to the sealing surface;
• and
• sensing a rate of rotation of the seal plate with a sensor, wherein the sensor is mounted to a housing of the gas turbine engine.

A seal plate comprising:

• an annular body;
• a scoop connected to and extending radially from the annular body, wherein the scoop defines an annulus, wherein the scoop is disposed on a first axial end of the annular body;
• a sealing surface disposed on a second axial end of the annular body opposite from the scoop;
• a plurality of teeth disposed into and along an outer perimeter of a portion of the annular body, wherein the plurality of teeth are configured to induce a current as the seal plate is rotated;
• and
• a channel extending through a portion of the annular body, wherein the channel is fluidly connected to the scoop and to the sealing surface, wherein the seal plate comprises a wet seal configured to form a sealing interface using a fluid, wherein the seal plate comprises a face seal with the sealing surface oriented orthogonally to a rotational axis of the seal plate, and wherein a material of the seal plate comprises a ferromagnetic metal.