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Carbon nanotube dewpoint and ice condition sensor

  • US 9,086,363 B2
  • Filed: 09/08/2009
  • Issued: 07/21/2015
  • Est. Priority Date: 09/05/2008
  • Status: Active Grant
First Claim
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1. An apparatus for detection of a dew point of an ambient gas containing moisture and of an icing condition, the apparatus comprising:

  • a sensor comprising an activated carbon nanotube (CNT) having a resistance that varies in proportion to humidity of the ambient gas;

    a signal conditioner; and

    a data acquisition device configured to monitor the resistance of the activated CNT during temperature change of the sensor to identify a peak resistance of the activated CNT positioned in the ambient gas, wherein the peak resistance of the activated CNT indicates icing of moisture in the ambient gas, and the data acquisition device further configured to identify a maximum rate of increase in said resistance verses the temperature change, which is indicative of a temperature of a dew point.

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