Microwave ice accretion measuring instrument

Details Microwave ice accretion measuring instrument Microwave ice accretion measuring instrument

1984-08-10

1987-08-18

Krass, Errol A.

Boots, shoes, and leggings

244134F, 324 585R, 340580, B64D 1500, G01R 2704, G08B 1902, G01B 1500

Patent

active

046881859

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 measuring 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 received at the output port is peak detected to provide a detection signal with four recognizable transitions identifying 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 corresponding to an ice-free condition, to determine ice thickness.

REFERENCES:
patent: 2789281 (1957-04-01), Short et al.
patent: 3240054 (1966-03-01), Roth
patent: 3836846 (1974-09-01), Overall et al.
patent: 4054255 (1977-10-01), Magenheim
patent: 4060212 (1977-11-01), Magenheim
patent: 4095456 (1978-06-01), Edgington
Magenheim, B. and Rocks, J., "A Microwave Ice Accretion Measurement Instrument MIAMI", paper presented at the AIAA 20th Aerospace Sciences Meeting, Jan. 11-14, 1982.
Magenheim, B. and Rocks, J., "Microwave Ice Accretion Measurement Instrument (MIAMI)", Journal of Aircraft, vol. 20, No. 3, Mar. 1983, pp. 262 et seq.

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