Method of determining the risk of ice deposition due to precipitation and apparatus for exercising the method
First Claim
1. A method of determining risk of ice deposition from air due to precipitation comprising the steps of measuring the air temperature, estimating a type of precipitation and an amount of precipitation, rotating a surface element having a surface with a predetermined area through the air for a predetermined period of time, measuring an actual amount of ice accumulated on the surface element, and combining the measurements to determine the risk of ice deposition.
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Abstract
The invention relates to a method and an apparatus for determining the risk of ice deposition due to precipitation. According to the invention the measurements of precipitation known so far are combined with measurements of the actual amount of ice deposited from the precipitation. Said measurements are combined in a combination unit that is able to receive further parameter information, eg the amount and type of anti-icing liquid. Compared to previously a considerably more reliable determination of the risk of ice deposition is accomplished, eg on the wing of an aeroplane applied with anti-icing liquid, and so is reliable determination of the holdover time, HOT, during which one can be sure that the aeroplane is free from ice in the current weather conditions.
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Citations
20 Claims
- 1. A method of determining risk of ice deposition from air due to precipitation comprising the steps of measuring the air temperature, estimating a type of precipitation and an amount of precipitation, rotating a surface element having a surface with a predetermined area through the air for a predetermined period of time, measuring an actual amount of ice accumulated on the surface element, and combining the measurements to determine the risk of ice deposition.
- 18. An apparatus for determining a risk of ice deposition from air due to precipitation which comprises a combination of optical means for measuring reflectivity of precipitation, mechanical means for rotating a measuring surface element in relation to the air and for measuring an amount of ice accumulated on the surface element during a given period of time, and electronic means for combining said measurements.
Specification