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Intermittent asynchronous IR beam-break fog detector

  • US 9,978,271 B2
  • Filed: 04/11/2017
  • Issued: 05/22/2018
  • Est. Priority Date: 05/28/2016
  • Status: Active Grant
First Claim
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1. A process for operating a beacon system responsive to at least one of a plurality of predetermined initiating conditions, said beacon system having multiple beacon units, with each unit having at least one lamp, said beacon units being arranged in a sequence along a travel route, each of said beacon units having transmission capability to link to at least one adjacent beacon unit in said sequence, and being responsive to a link signal from a second adjacent beacon unit, said process comprising:

  • a) transmitting link signals from said beacon units to trigger at least partial activation of the corresponding one adjacent beacon unit;

    b) automatically detecting a received link signal from the corresponding second adjacent unit in said sequence and triggering partial activation of a receiving beacon unit upon detection of said received link signal;

    c) in the partially activated beacon unit detecting for a continuing absence of said received link signal, and initiating a predetermined timing cycle responsive to said continuing absence of said link signal;

    d) detecting for receipt of a reestablishing link signal in the partially activated beacon unit during said predetermined timing cycle;

    e) fully activating said partially activated beacon unit responsive to the absence of the reestablishing link signal for the duration of said predetermined timing cycle;

    f) detecting vehicular traffic near said fully activated beacon unit; and

    ,g) illuminating said at least one lamp associated with said fully activated beacon responsive to detection of vehicular traffic, wherein absence of said reestablished link signal is indicative of said at least one of the plurality of predetermined initiating conditions selected from a group including fog, snow, rain and dust.

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