Detection system for gas turbine engine
An optical foreign object detection (FOD) system for a gas turbine engine includes a multiple of emitters arranged about an inner periphery of a fan cowl, a multiple or receivers arranged about the inner periphery of the fan cowl, each of the multiple of receivers receiving a beam from one of the multiple of emitters to form a beam matrix; and a control system in communication with the multiple of emitters and the multiple of receivers, the control system operable to detect a minimum sized object in response to breaking at least one beam of the beam matrix.
1. A detection system for a gas turbine engine comprising:
a multiple of emitters arranged about an inner periphery of an inlet cowl of a nacelle assembly;
a multiple of receivers arranged about the inner periphery of the inlet cowl of the nacelle assembly, each of the multiple of receivers receiving a beam from one of the multiple of emitters to form a beam matrix, the beam matrix configured so that a central area of the inlet cowl has a lesser concentration of beams than a periphery within the inlet cowl; and
a control system in communication with the multiple of emitters and the multiple of receivers, the control system operable to detect a minimum damaging sized object in response to breaking at least one beam of the beam matrix.
2. The system as recited in claim 1 , wherein each beam is up to 5000 mW (5 watts) in power.
3. The system as recited in claim 1 , wherein each beam is about 0.125 inches (3.175 mm) in diameter.
4. The system as recited in claim 1 , wherein each beam is a laser beam.
5. The system as recited in claim 4 , wherein each beam is in the infrared spectrum.
6. The system as recited in claim 1 , wherein the beam matrix is rectilinear.
7. The system as recited in claim 6 , wherein the minimum damaging sized object is 1 square inch.
8. The system as recited in claim 1 , wherein the beams arranged about the inner periphery of the inlet cowl of the nacelle assembly detect the minimum damaging sized object.
9. The system as recited in claim 8 , wherein the beams are arranged to detect the minimum damaging sized object only outside of a minimum diameter that defines the central area of the inlet cowl.
10. The system as recited in claim 9 , wherein the minimum diameter is greater than 10-30% of the diameter of the inner periphery.
11. An inlet cowl for a gas turbine engine comprising:
a multiple of emitters arranged about an inner periphery of the inlet cowl, the multiple of emitters located in a common plane transverse to a central axis of the inlet cowl; and
a multiple of receivers arranged about the inner periphery of the inlet cowl within the common plane, each of the multiple of receivers operable to receive a laser beam from one of the multiple of emitters, the multiple of emitters and the multiple of receivers arranged to form a beam matrix to detect a minimum damaging sized object, the beam matrix configured so that a central area of the inlet cowl has a lesser concentration of beams than a periphery within the inlet cowl.
12. The inlet cowl assembly as recited in claim 11 , wherein the beam matrix is rectilinear.
13. The inlet cowl assembly as recited in claim 11 , wherein the beams are arranged to detect the minimum damaging sized object only outside of a minimum diameter that defines the central area of the inlet cowl, the minimum diameter greater than 10%-30% of the diameter of the inner periphery.
14. A method of foreign object debris (FOD) detection for a gas turbine engine, comprising:
illuminating a multiple of receivers about an inner periphery of an inlet cowl by a multiple of emitters arranged about the inner periphery of the inlet cowl to form a beam matrix arranged to detect a minimum damaging sized object, the beam matrix configured so that a central area of an inlet cowl has a lesser concentration of beams than a periphery within the inlet cowl;
identifying breaking of at least one beam of the beam matrix; and
recording the breaking of the at least one beam.
15. The method as recited in claim 14 , wherein illuminating the beam matrix comprises arranging the beam to detect the minimum damaging sized object only outside of a minimum diameter that defines the central area of the inlet cowl, the minimum diameter greater than 10%-30% of the diameter of the inner periphery.
16. The method as recited in claim 14 , wherein illuminating the beam matrix comprises forming a rectilinear beam matrix.
17. The method as recited in claim 14 , wherein the recording comprises setting a bit in a control system.
18. The method as recited in claim 14 , wherein the recording comprises communicating with a Health and Usage Monitoring Systems (HUMS).