Fiber optic sensors for gas turbine control

Optical waveguides – Optical waveguide sensor

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431 22, 431 79, F23N 508

Patent

active

059785250

ABSTRACT:
An apparatus for detecting flashback occurrences in a premixed combustor system having at least one fuel nozzle includes at least one photodetector and at least one fiber optic element coupled between the at least one photodetector and a test region of the combustor system wherein a respective flame of the fuel nozzle is not present under normal operating conditions. A signal processor monitors a signal of the photodetector. The fiber optic element can include at least one optical fiber positioned within a protective tube. The fiber optic element can include two fiber optic elements coupled to the test region. The optical fiber and the protective tube can have lengths sufficient to situate the photodetector outside of an engine compartment. A plurality of fuel nozzles and a plurality of fiber optic elements can be used with the fiber optic elements being coupled to respective fuel nozzles and either to the photodetector or, wherein a plurality of photodetectors are used, to respective ones of the plurality of photodetectors. The signal processor can include a digital signal processor.

REFERENCES:
patent: 3752090 (1973-08-01), Frankel et al.
patent: 5166990 (1992-11-01), Riccitelli et al.
patent: 5408830 (1995-04-01), Lovett
patent: 5471840 (1995-12-01), Lovett
patent: 5676712 (1997-10-01), Anderson

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