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Highly sensitive airflow direction sensing

  • US 8,002,199 B2
  • Filed: 12/12/2008
  • Issued: 08/23/2011
  • Est. Priority Date: 12/12/2008
  • Status: Active Grant
First Claim
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1. An airflow direction sensor comprising:

  • an airflow passage for conducting air between different volumes;

    a first temperature sensitive device adjacent to one end of said passage;

    a second temperature sensitive device at an intermediate location in said passage;

    a heat source at an opposite end of said passage; and

    comparing means associated with said first and second temperature sensitive devices for comparing temperature sensed by each of said devices and providing an output indicative thereof.

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