Method for the monitoring and control of a process
First Claim
1. A method of sensing a process comprising:
- providing laser light at multiple select lasing frequencies;
simultaneously multiplexing the select lasing frequencies of laser light;
transmitting the multiplexed laser light in a pitch side optical fiber to a pitch optic;
projecting the multiplexed laser light from the pitch optic through a process;
receiving the multiplexed laser light in a catch side optic;
transmitting the multiplexed laser light from the catch optic through a catch side optical fiber to a demultiplexer;
demultiplexing the multiplexed laser light;
transmitting a frequency of demultiplexed laser light to a detector; and
determining a combustion parameter from an output of the detector.
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Accused Products
Abstract
A method of sensing a process utilizing 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.
38 Citations
19 Claims
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1. A method of sensing a process comprising:
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providing laser light at multiple select lasing frequencies; simultaneously multiplexing the select lasing frequencies of laser light; transmitting the multiplexed laser light in a pitch side optical fiber to a pitch optic; projecting the multiplexed laser light from the pitch optic through a process; receiving the multiplexed laser light in a catch side optic; transmitting the multiplexed laser light from the catch optic through a catch side optical fiber to a demultiplexer; demultiplexing the multiplexed laser light; transmitting a frequency of demultiplexed laser light to a detector; and determining a combustion parameter from an output of the detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification