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Non-contacting temperature sensing device

  • US 6,222,454 B1
  • Filed: 07/01/1999
  • Issued: 04/24/2001
  • Est. Priority Date: 07/01/1999
  • Status: Expired due to Term
First Claim
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1. A non-contacting temperature sensing device for use with a vehicle, comprising:

  • a first infrared sensing means for detecting infrared radiation within a first wavelength band and for producing a first signal corresponding to said detected infrared radiation of said first wavelength band;

    said first infrared sensing means comprising an active infrared detecting element providing an active signal and a first temperature drift compensating element providing an inactive signal and said first signal corresponding to an amplified difference between said active signal and said inactive signal;

    a second infrared sensing means for detecting infrared radiation within a second wavelength band and for producing a second signal corresponding to said detected infrared radiation of said second wavelength band;

    said second infrared sensing means comprising an active infrared detecting element providing an active signal and a second temperature drift compensating element providing an inactive signal and said second signal corresponding to an amplified difference between said active signal and said inactive signal power means for powering said first and second infrared sensing means; and

    signal processing means for obtaining the ratio of the first and second signal in order to provide a third signal, said third signal being emissivity independent and proportional to a temperature.

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