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Tri-State Detector

  • US 20130177343A1
  • Filed: 01/07/2013
  • Published: 07/11/2013
  • Est. Priority Date: 01/06/2012
  • Status: Active Grant
First Claim
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1. An apparatus, comprising:

  • a light emitter configured to emit light into a field of view; and

    a multi-element detector configured to indicate whether light is present in the field of view and whether polarized light is detected in the field of view.

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