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Infrared sensor for short range detection wherein the sun may be in the field of view of the detector

  • US 5,093,574 A
  • Filed: 12/14/1990
  • Issued: 03/03/1992
  • Est. Priority Date: 12/14/1990
  • Status: Expired due to Term
First Claim
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1. An infrared sensor for short range detection of vehicles, said sensor able to detect vehicles with sun in said sensor'"'"'s field of view, said sensor being operated upon a spinning platform wherein said spinning platform has precessional motion, said sensor comprising:

  • a) first detector sensitive to radiation in a first predetermined frequency band;

    b) second detector sensitive to radiation in a second predetermined frequency band, said second detector tracking a radiation signal if said radiation signal is below a threshold in said first predetermined frequency band; and

    c) objective lens to focus said radiation on said first and said second detector.

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