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LED EMITTER FOR OPTICAL TRAFFIC CONTROL SYSTEMS

  • US 20110115409A1
  • Filed: 03/19/2009
  • Published: 05/19/2011
  • Est. Priority Date: 06/16/2008
  • Status: Active Grant
First Claim
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1. A light emitter for a traffic control preemption system, comprising:

  • a plurality of groups of infrared (IR) LEDs, each group including one or more IR LEDs;

    a power source coupled to the groups of LEDs;

    a plurality of controlled current sources coupled to the plurality of groups of LEDs, respectively; and

    a controller coupled to the plurality of controlled current sources, wherein the controller is configured to trigger an IR light pulse pattern from the groups of LEDs and maintain a first level of IR radiant power from the groups of LEDs using individual control of respective current levels to the groups of LEDs in response to current sense levels from the groups of LEDs, wherein the pulse pattern and first level of IR radiant power activate preemption in the traffic control preemption system.

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