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Aircraft icing sensor

  • US 7,683,791 B2
  • Filed: 08/02/2007
  • Issued: 03/23/2010
  • Est. Priority Date: 08/02/2007
  • Status: Expired due to Fees
First Claim
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1. An apparatus for detecting the presence of ice and comprising:

  • a sensor operable to be coupled to a surface exposed to moisture and comprising a radio-frequency transmission line providing a characteristic impedance, wherein the transmission line comprises an inner conductor and a first outer conductor proximate to said inner conductor, the first outer conductor being spaced from the inner conductor by dielectric material;

    a source coupled to the transmission line and operable to inject a wave into the transmission line;

    a summer operable to create a standing wave, the standing wave comprising the sum of the injected wave and a reflected wave reflected by the end of the transmission line, said summer being connected between the source and the transmission line;

    a detector for detecting a voltage of the standing wave; and

    a comparator operable to compare the detected voltage with reference data for determining the presence of ice contacting the sensor.

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