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Method of determining the risk of ice deposition due to precipitation and apparatus for exercising the method

A technique for hazards, equipment, applied in the field of determining the danger of icing due to precipitation

Inactive Publication Date: 2005-10-19
DALSGAARD NIELSEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] air traffic uses various types of antifreeze at various concentrations when there is a risk of ice formation and the question to estimate is how long the antifreeze will remain effective under current weather conditions

Method used

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  • Method of determining the risk of ice deposition due to precipitation and apparatus for exercising the method
  • Method of determining the risk of ice deposition due to precipitation and apparatus for exercising the method
  • Method of determining the risk of ice deposition due to precipitation and apparatus for exercising the method

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Embodiment Construction

[0033] Figure 1 shows a June 2002 Transport Canada table used to estimate HOT. The table is for "rearward" use, ie the driver's estimated visibility in statute miles (quantities given in twelve divisions). When estimating visibility in snow, it is important whether it is day or night and also temperature plays a role. This table is used to estimate whether the snowfall was "heavy", "moderate" or "light". Then use another table (not shown) indicating the precipitation equivalent water quantity as a function of "large / medium / small" and once found, use another table (not shown) to obtain the equivalent water quantity as The HOT time limit of the function.

[0034] The method taught in the context of FIG. 1 is thus based inter alia on the estimation of visibility and lightness or darkness.

[0035] On July 29, 2002, the National Center for Atmospheric Research published an article explaining the scientific reasons why it is inappropriate to use the decision parameters derived f...

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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.

Description

technical field [0001] The invention relates to a method of determining the risk of icing due to precipitation. The invention is used in particular, but not exclusively, for determining icing hazards in air traffic. Background technique [0002] Air traffic uses antifreeze fluids of various types and concentrations when there is a risk of ice formation, and the question to estimate is how long the fluid will remain effective under current weather conditions. This is called "holdover time"; hereinafter denoted "HOT". [0003] The International Airline Organization publishes schedules indicating some antifreeze fluids and hold times at relatively small concentrations of these antifreeze fluids. These tables (which are the only tools currently available) are associated with two major uncertainties. Firstly, the time limits listed in these tables are given with large margins, such as a minimum of 30 minutes and a maximum of 60 minutes, and secondly, the tables can only be use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64D15/20B64F5/00G01W1/10
CPCB64D15/20B64F5/0018G01W1/10B64F5/30
Inventor 埃文·尼尔森
Owner DALSGAARD NIELSEN
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