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Apparatus and method for monitoring the output of a warning or indicator light

  • US 7,154,403 B2
  • Filed: 06/30/2004
  • Issued: 12/26/2006
  • Est. Priority Date: 06/30/2004
  • Status: Active Grant
First Claim
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1. An operational status detection system for a railroad warning device having a warning light, comprising:

  • a photodiode configured to generate a signal corresponding to a light output of the warning light of the railroad warning device;

    an amplifier for increasing a signal strength of said signal and providing an output corresponding to said signal;

    a filter receptive to said output and configured to only allow portions of said output corresponding to the light output of the warning light to be presented as an output signal of the warning light, wherein a portion of said output corresponding to ambient sunlight is filtered by said filter; and

    a microcontroller receptive to said output signal and for comparing said output signal to at least one threshold value, said at least one threshold value corresponding to an acceptable light output of the warning light.

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