Aeronautics and astronautics – Aircraft structure – Ice prevention
Patent
1976-04-01
1977-10-18
Blix, Trygve M.
Aeronautics and astronautics
Aircraft structure
Ice prevention
73170R, 73178H, 324 585B, 340234, B64D 1520
Patent
active
040542556
ABSTRACT:
A system for detecting ice on exterior surfaces of aircraft by transmitting a relatively low power microwave electromagnetic signal into a dielectric layer functioning as a surface waveguide, and monitoring the signals transmitted into and reflected from the waveguide. The waveguide includes a termination element which is mismatched with the waveguide impedance, resulting in partial or total reflection of the microwave energy from the remote end of the waveguide. As ice builds up on the surface waveguide, the impedance or reflection characteristics of the composite waveguide comprising the ice layer and the permanent surface waveguide give a reliable indication of the presence and location of the ice. The reflection characteristics are conventionally monitored utilizing a dual directional coupler and a reflectometer.
REFERENCES:
patent: 3836846 (1974-09-01), Overall et al.
Blix Trygve M.
Kelmachter Barry L.
System Development Corporation
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