Sensor system

A sensor system for measuring a parameter of a target, the sensor system comprising:

• a diaphragm;
• a sensor for determining a time that a signal transmitted by the sensor travels from the sensor to the diaphragm and back to the sensor, the sensor using the time for measuring an axial spacing between the sensor and the diaphragm;
• and
• an axially adjustable mount having a first axial end for mounting the diaphragm which is axially movable relative to the sensor and an opposing, second axial end which is axially fixed relative to the sensor, the diaphragm and the axially adjustable mount defining a chamber for opening to the target in a gas turbine engine or for extending within the target;
• wherein, in use, a change in a differential of the parameter across the diaphragm results in a change in a volume of the chamber and a change in the axial spacing between the first axial end and the second axial end of the axially adjustable mount and thus a change in the axial spacing between the diaphragm and the sensor.

A sensor system for measuring a parameter of a target in a gas turbine engine, the sensor system comprising:

• a diaphragm;
• a sensor mounted in the gas turbine engine, the sensor being configured for measuring an axial spacing between the sensor and the diaphragm;
• an axially adjustable mount having a first axial end for mounting the diaphragm which is axially movable relative to the sensor and an opposing, second axial end which is axially fixed relative to the sensor, the diaphragm and the axially adjustable mount defining a chamber for opening to the target or for extending within the target, the sensor being positioned outside the chamber but being configured to communicate directly from the sensor to within the chamber such that there is an unencumbered path between the sensor and the chamber, the chamber being defined by an area enclosed by interior surfaces of the diaphragm and corrugated axial walls extending from the diaphragm, and the sensor being configured to output a signal to a frame that is connected to the chamber and is outside of the chamber;
• and
• a frame extending from the second axial end of the axially adjustable mount to the sensor to define an enclosed passage in which the emitted signal and reflected signal can travel to and from the diaphragm through the chamber;
• wherein, in use, a change in a differential of the parameter across the diaphragm results in a change in a volume of the chamber and a change in the axial spacing between the first axial end and the second axial end of the axially adjustable mount and thus a change in the axial spacing between the diaphragm and sensor.