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Rain sensor using low harmonic content signals

  • US 6,634,225 B1
  • Filed: 12/17/2001
  • Issued: 10/21/2003
  • Est. Priority Date: 06/18/1999
  • Status: Expired due to Term
First Claim
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1. A rain sensor for detecting humidity drops within an area on a transparent window, the rain sensor comprising:

  • at least one transmitting element for emitting optical rays into the window;

    at least one receiving element for receiving at least one part of the optical rays emitted, wherein the intensity of the optical rays received is dependent on the number of humidity drops in the area of the window observed by the rain sensor; and

    means for generating an electrical signal having a lower harmonic content than a square-wave signal, the generating means supplying the electrical signal to the at least one transmitting element of the rain sensor.

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