Temperature sensor array for a gas turbine engine
A gas turbine engine component includes a conformal surface. An array of resistance temperature detector (RTD) sensors is disposed across at least a portion of the conformal surface and a plurality of printed circuit traces are deposited on the conformal surface. The printed circuit traces connect each of the RTD sensors to a controller via a corresponding four wire circuit. Each circuit trace in the plurality of circuit traces extends to a circumferential edge of the conformal surface.
1. A gas turbine engine component comprising:
a conformal surface;
an array of resistance temperature detector (RTD) sensors disposed across at least a portion of the conformal surface;
a plurality of printed circuit traces deposited on said conformal surface and connecting each of said RTD sensors to a controller via a corresponding four wire circuit; and
wherein each circuit trace in said plurality of circuit traces extends to a circumferential edge of said conformal surface; and
wherein each of said RTD sensors is a printed precision RTD sensor comprising a primary trace and a plurality of secondary traces, a subset of the plurality of secondary traces being shorted by a conductive layer of the RTD sensor.
2. The component of claim 1 , wherein the RTD sensors and the printed circuit traces are direct print components.
3. The component of claim 1 , wherein each of the printed circuit traces is comprised of at least one of a copper, nickel, silver, platinum, and tungsten material.
4. The component of claim 3 , wherein each of the RTD sensors is comprised of one of a pure platinum material and a printable ink formulation of platinum and an additive, wherein the additive is one of a ceramic additive and a polymeric additive.
5. The component of claim 1 , wherein a line resistance of each of said circuit traces is negligible relative to a resistance value of a connected RTD sensor at a minimum operating temperature.
6. The component of claim 1 , wherein a first node of each RTD sensor is connected to a current source and a first input of a corresponding programmable gain amplifier, and a second node of each RTD sensor is connected to a neutral and a second input of the corresponding programmable gain amplifier.
7. The component of claim 6 , wherein each of the RTD sensors is connected to the same programmable gain amplifier via a multiplexer.
8. The component of claim 6 , further comprising a plurality of programmable gain amplifiers, and wherein each of the RTD sensors is connected to a distinct programmable gain amplifier, the distinct programmable gain amplifier to which each of the RTD sensors is connected being the corresponding programmable gain amplifier for the RTD sensor.
9. The component of claim 1 , further comprising a wetting layer disposed between said printed circuit traces and said conformal surface.
10. The component of claim 9 , wherein the wetting layer comprises a crystalline molybdenum compound.
11. The component of claim 10 , wherein the crystalline molybdenum compound comprises Mo2C.
12. The component of claim 1 , wherein the conformal surface is a surface of a combustor panel.
13. The component of claim 1 , wherein the primary trace is comprised of one of a platinum and a platinum and ceramic mixture, and wherein the secondary traces are comprised of the same material as the primary trace.
14. The component of claim 1 , wherein the conductive layer is comprised of a silver material.
15. The component of claim 1 , wherein said conductive layer is a terminal pad for one node of the corresponding four wire circuit.
16. A gas turbine engine comprising:
a compressor;
a combustor fluidly connected to the compressor;
a turbine fluidly connected to the combustor; and
at least one component including a thermal sensor array disposed about at least one conformal surface of the gas turbine engine, wherein the thermal sensor array is an approximately two dimensional array; and
wherein the thermal sensor array is an array of resistance temperature detector (RTD) sensors disposed across at least a portion of the conformal surface;
a plurality of printed circuit traces deposited on said conformal surface and connecting each of said RTD sensors to a controller via a corresponding four wire circuit; and
wherein each circuit trace in said plurality of circuit traces extends to a circumferential edge of said conformal surface; and
wherein each of said RTD sensors is a printed precision RTD sensor comprising a primary trace and a plurality of secondary traces, a subset of the plurality of secondary traces being shorted by a conductive layer of the RTD sensor.
17. The gas turbine engine of claim 16 , wherein each thermal sensor in the thermal sensor array is a resistance temperature detector (RTD) sensor and wherein each of said RTD sensors is connected to a current source and a first input of a programmable gain amplifier, and a second node of each RTD sensor is connected to a neutral and a second input of the programmable gain amplifier.
18. The gas turbine engine of claim 16 , wherein the at least one conformal surface includes a conformal surface of one of the compressor, the combustor, and the turbine.