Microwave ice accretion measuring instrument

Details Microwave ice accretion measuring instrument Microwave ice accretion measuring instrument

B - Operations, Transporting

64

D

340/139, 354/25,

B64D 15/22 (2006.01) B64D 15/20 (2006.01) G01B 15/02 (2006.01) G08B 19/02 (2006.01)

Patent

CA 1236575

IMPROVED MICROWAVE ICE ACCRETION MEASURING INSTRUMENT ABSTRACT An ice measurement instrument includes a waveguide operating in a transmission mode passing energy from an input port to an output port. The resonant frequency of the waveguide depends on the presence and/or thickness of ice at a measu- ring location. The energy applied to the input port is swept in frequency from a first frequency to a second frequency at or above an ice-free resonant frequency of said waveguide, and back to said first frequency. Energy re- ceived at the output port is peak detected to provide a detection signal with four recognizable transitions identi- fying a pair of peaks which correspond to the resonant frequency of the waveguide. The time delay between these peaks can be used, in comparison with the time delay cor- responding to an ice-free condition, to determine ice thickness.

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