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Optical path structure for open path emissions sensing with opposed sources

  • US 6,833,922 B2
  • Filed: 12/28/2001
  • Issued: 12/21/2004
  • Est. Priority Date: 08/21/2001
  • Status: Active Grant
First Claim
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1. An optical system for a gas component analysis, comprising:

  • a first emitter for emitting a first light beam having a first spectrum;

    a second emitter for emitting a second light beam at a second spectrum;

    a first receiver for receiving the first light beam;

    a second receiver for receiving the second light beam, wherein the first light beam travels along a first path in a first direction and the second light beam travels along a second path in a second direction and at least a portion of the first light path overlaps with at least a portion of the second light path to form an overlapping beam, and at the overlapping beam the first direction is opposite to the second direction;

    a third light emitter for emitting a third light beam; and

    a third light receiver for receiving the third light beam, wherein the third light beam travels along a third path, and at least a portion of the third path overlaps with at least a portion of the second path.

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