Method and apparatus for the monitoring and control of combustion
First Claim
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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Abstract
A sensing apparatus consisting of more than one diode laser having select lasing frequencies, a multiplexer optically coupled to the outputs of the diode lasers with the multiplexer being further optically coupled to a pitch side optical fiber. Multiplexed laser light is transmitted through the pitch side optical fiber to a pitch optic operatively associated with a process chamber which may be a combustion chamber or the boiler of a coal or gas fired power plant. The pitch optic is oriented to project multiplexed laser output through the process chamber. Also operatively oriented with the process chamber is a catch optic in optical communication with the pitch optic to receive the multiplexed laser output projected through the process chamber. The catch optic is optically coupled to an optical fiber which transmits the multiplexed laser output to a demultiplexer. The demultiplexer demultiplexes the laser light and optically couples the select lasing frequencies of light to a detector with the detector being sensitive to one of the select lasing frequencies.
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Citations
32 Claims
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1. A sensing apparatus comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification