Boots – shoes – and leggings
Patent
1989-12-19
1991-09-17
Dixon, Joseph L.
Boots, shoes, and leggings
73 76, 73 2901, 364423, G01N 502
Patent
active
050501097
ABSTRACT:
An apparatus and method of determining the humidity of ambient air surrounding an aircraft in flight are disclosed. Air is captured as the aircraft flies. Measurements for calculating the mass flow rate of the captured air are made. The captured air is dehumidified in a moisture extractor. A flow of moisture and aa flow of dehumidified air exit from the water extractor. The mass flow rate of the moisture exiting from the moisture extractor is measured. The humidity of the captured air is calculated based on the respective mass flows and the efficiency of the moisture extractor. Because the mass flow measurements and the efficiency of the moisture extractor depend, in part, on the humidity of the captured air, an assumed humidity value is used at the beginning of the calculations. The assumed humidity is compared to the calculated humidity. If the newly calculated humidity is approximately equal to that used in the calculations, the value is output as the humidity of ambient air. If they are not approximately equal, the calculations are repeated until the calculated humidity value and the assumed humidity value are approximately equal. As the aircaft flies, new ambient air is constantly capatured, measurements are made, and the humidity value is recalculated. The crew and equipment are thus provided with an accurate and constantly updated humidity value of ambient air during the flight.
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Dixon Joseph L.
The Boeing Company
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