G - Physics – 08 – B
Patent
G - Physics
08
B
340/139
G08B 21/00 (2006.01) B64D 15/20 (2006.01) G08B 19/02 (2006.01)
Patent
CA 1192972
ABSTRACT An ice monitoring apparatus contains a first continuous light source and a second light emitting source, a photo- diode which responds to light from both sources and a transparent sheet which is arranged in the path of light between the first source of light and the photodiode and the surface of which forms a surface for measuring the formation of ice. As long as the measuring surface is not iced and the sheet is optimally transparent, the photo- diode is driven by the luminous flux from the first light source in the region of saturation, and the luminous flux from the second light source has little effect upon the photoelectric current. When ice forms upon the measuring surface, the luminous flux from the first light source is weakened and the photoelectric current in the photoelectric cell is increasingly modulated by the luminous flux from the second light source. The modulated photoelectric current is used as a quantitative signal of the build up of the layer of ice. An electronic circuit monitors the gradual decrease in transparency, to differentiate between dust on the sheet and ice formation.
415478
Kovacs Paul
Ridout & Maybee Llp
LandOfFree
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