Moisture sensor and windshield fog detector

  • US 7,199,346 B2
  • Filed: 09/20/2005
  • Issued: 04/03/2007
  • Est. Priority Date: 09/16/1997
  • Status: Expired due to Fees
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First Claim
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1. A fog detection system for detecting fog on a vehicle windshield, said system comprising:

  • an image sensor;

    an optical system operative to image at least a portion of the surface of the windshield onto the image sensor;

    an illumination device for illuminating an area within the at least one portion of the windshield surface, said optical system and illumination device configured to image reflections caused by fog on the inside and outside of the windshield in a different positions on said image sensor; and

    a processing system in communication with the image sensor and operative to analyze images from the image sensor to determine whether there is fog on the inside or outside of the windshield based upon the spatial position of the imaged reflections on said image sensor.

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