Detector apparatus

  • US 5,990,821 A
  • Filed: 07/07/1997
  • Issued: 11/23/1999
  • Est. Priority Date: 04/22/1994
  • Status: Expired due to Term
First Claim
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1. A detector apparatus for detecting the presence of a speed measuring system comprising:

  • a housing having a plurality of apertures;

    a plurality of lenses, each of said lenses disposed in one of the apertures, wherein the focal points of at least two of the lenses are directed to at least a portion of a common focal point region;

    a radiation detector mounted in the housing and positioned to receive radiation received at the common focal point region through at least one of the lenses;

    a signal processing circuit having an input coupled to the radiation detector and an output;

    a controller having an input coupled to the output of the signal processing circuit and an output; and

    a display having an input coupled to the controller, wherein the controller provides an alarm signal to the display following detection of a speed measuring signal by the radiation detector.

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