Detecting the presence of ice on a surface using ultraviolet light
A system detects ice on a surface. The system comprises an ultraviolet (UV) light source configured to project light primarily in the UV-A spectrum onto the surface. The system further comprises an optical device configured to capture an image of the surface while the light primarily in the UV-A spectrum is projected by the UV light source. The system further comprises a control device communicatively coupled to the optical device. The control device is configured to receive the image from the optical device and determine whether or not ice is present on the surface based respectively on whether or not visible light induced by the light projected by the UV light source is captured in the image.
1. A system for detecting ice on a surface, the system comprising:
an ultraviolet (UV) light source configured to project light primarily in the UV-A spectrum onto the surface;
an optical device configured to capture an image of the surface while the light primarily in the UV-A spectrum is projected by the UV light source;
a control device communicatively coupled to the optical device, wherein the control device is configured to receive the image from the optical device and determine whether or not ice is present on the surface based respectively on whether or not visible light induced by the light projected by the UV light source is captured in the image by determining whether or not luminescence is captured in the image.
2. The system of claim 1 , wherein the control device is further configured to signal an ice protection system communicatively coupled to the control device to device the surface responsive to the control device detecting that the ice is present.
3. The system of claim 1 , wherein the UV light source and optical device are mounted on a fuselage of an aircraft and the surface is a surface of an airfoil.
4. The system of claim 3 , wherein the surface is aft of the UV light source and optical device on the fuselage.
5. The system of claim 1 , wherein to determine whether or not ice is present on the surface based respectively on whether or not visible light induced by the light projected by the UV light source is captured in the image, the control device is configured to compare the image to a baseline image of the surface in which ice is not present.
6. The system of claim 5 , wherein to compare the image to the baseline image in which ice is not present on the surface, the control device is configured to compare color characteristics of the image to color characteristics of the baseline image.
7. The system of claim 1 , wherein to determine whether or not ice is present on the surface based respectively on whether or not visible light induced by the light projected by the UV light source is captured in the image, the control device is configured to determine which of a plurality of stored images most closely resembles the image received from the optical device.
8. The system of claim 7 , wherein the plurality of stored images comprises different images of the surface in which ice is present at different temperatures.
9. The system of claim 1 , wherein the system further comprises an aircraft on which the UV light source and optical device are mounted, and which comprises the control device.
10. A system within an aircraft comprising:
a UV-A light source configured to project light just in the UV-A spectrum onto a surface of the aircraft;
an optical device configured to capture an image of the surface while the light in the UV-A spectrum is projected by the UV light source;
a control device communicatively coupled to the optical device, wherein the control device is configured to receive the image from the optical device and determine whether or not ice is present on the surface based respectively on whether or not visible light induced by the light projected by the UV-A light source is captured in the image by detecting whether or not luminescence is captured in the image.
11. The system of claim 10 , wherein the control device is further configured to signal an ice protection system communicatively coupled to the control device to device the surface responsive to the control device determining that the ice is present.
12. The system of claim 10 , wherein to determine whether or not ice is present on the surface based respectively on whether or not visible light induced by the light projected by the UV-A light source is captured in the image, the control device is configured to compare the image to a baseline image of the surface in which ice is not present.
13. The system of claim 12 , wherein to compare the image to the baseline image in which ice is not present on the surface, the control device is configured to compare color characteristics of the image to color characteristics of the baseline image.
14. The system of claim 10 , wherein to determine whether or not ice is present on the surface based respectively on whether or not visible light induced by the light projected by the UV-A light source is captured in the image, the control device is configured to determine which of a plurality of stored images most closely resembles the image received from the optical device.
15. The system of claim 14 , wherein the plurality of stored images comprises different images of the surface in which ice is present at different temperatures.
16. A method, implemented by an ice detection system, of detecting ice on a surface, the method comprising:
receiving an image of the surface while a light, primarily in the ultraviolet (UV)-A spectrum, is projected onto the surface by a UV light source;
determining whether or not ice is present on the surface based respectively on whether or not visible light induced by the light projected by the UV light source is captured in the image by detecting whether or not luminescence is captured in the image.
17. The method of claim 16 , further comprising projecting, by the UV light source, the light primarily in the UV-A spectrum onto the surface.
18. The method of claim 16 , wherein receiving the image comprises capturing, by an optical device of the ice detection system, the image of the surface while the light primarily in the UV-A spectrum is projected by the UV light source.
19. The method of claim 16 , further comprising signaling an ice protection system to device the surface responsive to detecting that the ice is present.
20. The method of claim 16 , wherein determining whether or not ice is present on the surface based respectively on whether or not visible light induced by the light projected by the UV light source is captured in the image comprises comparing the image to a baseline image of the surface in which ice is not present.
21. The method of claim 20 , wherein comparing the image to the baseline image in which ice is not present on the surface comprises comparing color characteristics of the image to color characteristics of the baseline image.
22. The method of claim 16 , wherein determining whether or not ice is present on the surface based respectively on whether or not visible light induced by the light projected by the UV light source is captured in the image comprises determining which of a plurality of stored images most closely resembles the image.
23. The method of claim 22 , wherein the plurality of stored images comprises different images of the surface in which ice is present at different temperatures.
24. The system of claim 1 , wherein the control device is further configured to distinguish between when the surface includes ice and when the surface is dry or wet.
25. The system of claim 1 , wherein the UV light source further comprises a transparent surface that is heated.
26. The method of claim 1 , wherein the light projected by the UV light source is within a range of 315 to 400 nanometers.