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Open path gas detector

  • US 9,506,804 B2
  • Filed: 01/10/2014
  • Issued: 11/29/2016
  • Est. Priority Date: 01/17/2013
  • Status: Active Grant
First Claim
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1. An open path gas detector comprising:

  • an optical element operable to receive radiation from an objective optical element and separate the radiation into a first radiation portion and a second radiation portion;

    a first beam-shaping optical element operable to receive the first radiation portion;

    a first photodiode comprising a first active sensing region operable to receive the first radiation portion from the first beam-shaping optical element;

    a filter operable to receive and filter the second radiation portion to produce a second filtered radiation portion;

    a second beam-shaping optical element operable to receive the second filtered radiation portion; and

    a second photodiode comprising a second active sensing region operable to receive the second filtered radiation portion from the second beam-shaping optical element;

    wherein the first beam-shaping optical element and the second beam-shaping optical element are operable to provide a substantially uniform illumination intensity profile across an entire first active sensing region of the first photodiode and the second active sensing region of the second photodiode.

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