Ice detector apparatus, system, and method

1. An ice detector apparatus for an aircraft, the ice detector apparatus comprising:

a heater strip configured to be mounted to a surface; a plurality of temperature sensors coupled along a length of the heater strip, wherein the plurality of temperature sensors is configured to detect a temperature profile comprising a spatial temperature map of the heater strip, and a controller in electronic communication with the heater strip and the plurality of temperature sensors, the controller being configured to determine a size of a colder middle portion of the heater strip using the spatial temperature map and determine an extent of icing based on the size of the colder middle portion, wherein the colder middle portion is disposed at or near a leading edge of a structure of the aircraft.

2. The ice detector apparatus of claim 1 , wherein the surface is an external surface of an aircraft, and wherein the controller is configured to determine whether the aircraft is operating in an appendix C icing-envelope or an appendix O icing-envelope based on the size of the colder middle portion.

3. The ice detector apparatus of claim 1 , wherein the heater strip is configured to extend around the leading edge such that a first end of the heater strip is disposed on a first side of the structure and a second end of the heater strip is disposed on a second side of the structure, wherein the first side is opposite the second side and the first side meets the second side at the leading edge.

4. The ice detector apparatus of claim 1 , wherein the heater strip comprises a carbon nanotube heater.

5. The ice detector apparatus of claim 1 , wherein the temperature sensors comprise a resistance temperature detector.

6. An aircraft comprising:

a heater strip mounted to a surface of the aircraft;

a plurality of temperature sensors coupled along a length of the heater strip, wherein the plurality of temperature sensors is configured to detect a temperature profile comprising a spatial temperature map of the heater strip; and

a controller operably coupled in electronic communication with the heater strip and the plurality of temperature sensor, the controller comprising a processor, wherein a tangible, non-transitory memory is configured to communicate with the processor, wherein the tangible, non-transitory memory has instructions stored thereon that, in response to execution by the processor, cause the aircraft to perform operations comprising:

determining, based on the temperature profile a size of a colder middle portion, whether a flight operating condition of the aircraft is in an appendix C icing-envelope or an appendix O icing-envelope.

7. The aircraft of claim 6 , wherein the operations further comprise, in response to determining the flight operating condition of the aircraft is in the appendix O icing-envelope, changing the flight operating condition to remove the aircraft from the appendix O icing-envelope.

8. The aircraft of claim 6 , wherein the operations further comprise, in response to determining the flight operating condition of the aircraft is in the appendix O icing-envelope, actuating supplementary de-icing.

9. The aircraft of claim 6 , wherein the structure comprises at least one of a wing, a tail, a horizontal stabilizer, and an inlet engine case.

10. The aircraft of claim 6 , wherein the heater strip extends around the leading edge such that a first end of the heater strip is disposed on a first side of the structure and a second end of the heater strip is disposed on a second side of the structure, wherein the first side is opposite the second side and the first side meets the second side at the leading edge.

11. The aircraft of claim 6 , further comprising at least one of an electrically insulative and a thermally insulative material disposed between the heater strip and the surface of the aircraft.

12. An ice detection method of an aircraft, the method comprising:

receiving, by a controller, a temperature profile from a plurality of temperature sensors coupled along a length of a heater strip mounted to an external surface of the aircraft,

wherein the temperature profile comprises a spatial temperature map of the heater strip; and

determining, by the controller and based on the temperature profile, whether a flight operating condition of the aircraft is in an appendix C icing-envelope or an appendix O icing-envelope, wherein a size of a colder middle portion of the heater strip is indicative of the flight operating condition.

13. The method of claim 12 , further comprising, in response to determining the flight operating condition of the aircraft is in the appendix O icing-envelope, changing, by the controller, the flight operating condition to remove the aircraft from the appendix O icing-envelope.

14. The method of claim 12 , further comprising, in response to determining the flight operating condition of the aircraft is in the appendix O icing-envelope, actuating, by the controller, supplementary de-icing.

15. The method of claim 12 , wherein determining whether the flight operating condition of the aircraft is in the appendix C icing-envelope or the appendix O icing-envelope comprises determining, by the controller, at least one of a size of water droplets in air around the aircraft and a water content of the air around the aircraft.

16. The method of claim 12 , wherein determining whether the flight operating condition of the aircraft is in the appendix C icing-envelope or the appendix O icing-envelope comprises determining, by the controller, a heat flux of the heater strip.

17. The method of claim 12 , further comprising controlling, by the controller, the heater strip.