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Method and apparatus for the monitoring and control of combustion

  • US 7,248,755 B2
  • Filed: 03/31/2004
  • Issued: 07/24/2007
  • Est. Priority Date: 03/31/2003
  • Status: Active Grant
First Claim
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1. A sensing apparatus comprising:

  • more than one diode laser each having a select lasing frequency;

    a multiplexer optically coupled to more than one of the diode laser, the multiplexer outputting a multiplexed laser output, the multiplexed laser output being optically coupled to a proximal end of a pitch side optical fiber;

    a pitch optic optically coupled to a distal end of the pitch side optical fiber, the pitch optic being operatively associated with a process chamber and oriented to project the multiplexed laser output through the process chamber;

    a catch optic operatively associated with the process chamber in optical communication with the pitch optic to receive the multiplexed laser output projected through the process chamber;

    a catch side optical fiber optically coupled to the catch optic at a proximal end;

    a demultiplexer optically coupled to a distal end of the catch side optical fiber, the demultiplexer demultiplexing laser light of each of the select lasing frequencies; and

    a detector optically coupled with the demultiplexer, the detector being sensitive to one of the select lasing frequencies.

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