Measuring and testing – Navigation – Take-off and landing monitors
Patent
1990-05-04
1993-03-09
Woodiel, Donald O.
Measuring and testing
Navigation
Take-off and landing monitors
G01C 2100
Patent
active
051917912
ABSTRACT:
The change in capacitance of a sensor is linearly proportional to ice thickness provided that the ice thickness is significantly less than the distance between the conductive electrodes. By employing sensors with different electrodes, the sensitivity to ice may be traded off against the ability to measure greater ice thickness. A sensor with small spacing between electrodes will exhibit a large change in capacitance when covered by a thin layer of ice, however, the capacitance change will be linear only for very thin layers of ice. A sensor with greater spacing between electrodes is less sensitive to ice accretion but has a correspondingly greater ice thickness measurement range. Accordingly, sensor (55) is relatively sensitive and is employed to determine whether or not ice or water is present. This is accomplished by circuit (60) determini
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Dahl Philip R.
Gerardi Joseph J.
Hickman Gail A.
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