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Patent US5544478A successfully refreshed from Google Patents.
US5544478A
Expired / Lapsed
US
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Optical sensing of combustion dynamics
Assignee: General Electric Co
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Filing: 1994-11-15
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Granted: 1996-08-13
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Expires: 2014-11-15
Abstract
Abstract An optical radiation detector, such as a silicon carbide photodiode ultraviolet radiation detector, is employed for real time, noninvasive monitoring and diagnosis of combustion dynamics in gas turbine engines. The SiC photodiode responds to flame ultraviolet emission, and a Fast Fourier Transform spectrum analyzer peak acoustic frequency components of the detector signal as indicators of systematic gas pressure vibrations related to combustion. The combustion may be modified in accordance with the monitored acoustic frequency components.
Inventors
- 👤 Emily Y. Shu
- 👤 Dale M. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:39
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/08; F23N5/082; F23N2223/00; F23N2229/00; F23N2229/08; F23N2241/00; F23N2241/20; F23N5/16; F23R; F23R2900/00; F23R2900/00013; F23R2900/00014; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
58 words
A system for monitoring combustion dynamics within a gas turbine combustor, comprising: an optical radiation detector for detecting optical emission from a combustion flame in the combustor to produce a detector signal; and apparatus for recognizing at least one peak frequency component of the detector signal as an indicator of a systematic gas pressure vibration related to combustion.
Claim 2
Independent Claim
58 words
A system for monitoring combustion dynamics within a gas turbine combustor, comprising: an optical radiation detector for detecting optical emission from a combustion flame in the combustor to produce a detector signal; and apparatus for recognizing at least one peak frequency component of the detector signal as an indicator of a systematic gas pressure vibration related to combustion.
Claim 3
Dependent Claim
39 words
The system of claim 1, wherein said apparatus for recognizing at least one peak frequency component comprises a spectrum analyzer for determining peak frequency components of the detector signal as indicators of systematic gas pressure vibrations related to combustion.
Claim 4
Dependent Claim
15 words
The system of claim 1, wherein said optical radiation detector comprises an ultraviolet radiation detector.
Claim 5
Dependent Claim
19 words
The system of claim 1, wherein said optical radiation detector comprises a silicon carbide photodiode for detecting ultraviolet radiation.
Claim 6
Dependent Claim
38 words
The system of claim 1, wherein said optical radiation detector comprises at least one of the group consisting of silicon carbide photodiodes, gallium phosphide photodiodes, silicon photodiodes, gallium nitride photosensitive devices, gallium arsenide photosensitive devices, and combinations thereof.
Claim 7
Dependent Claim
15 words
The system of claim 2, wherein said optical radiation detector comprises an ultraviolet radiation detector.
Claim 8
Dependent Claim
19 words
The system of claim 2, wherein said optical radiation detector comprises a silicon carbide photodiode for detecting ultraviolet radiation.
Claim 9
Dependent Claim
38 words
The system of claim 2, wherein said optical radiation detector comprises at least one of the group consisting of silicon carbide photodiodes, gallium phosphide photodiodes, silicon photodiodes, gallium nitride photosensitive devices, gallium arsenide photosensitive devices, and combinations thereof.
Claim 10
Dependent Claim
37 words
The system of claim 1, including a control element for dynamically controlling application of combustion fuel and air to the combustor in response to magnitude of the at least one peak frequency component of the detector signal.
Claim 11
Dependent Claim
20 words
The system of claim 1, wherein said apparatus for recognizing at least one peak frequency component comprises a bandpass filter.
Claim 12
Dependent Claim
15 words
The system of claim 10, wherein said optical radiation detector comprises an ultraviolet radiation detector.
Claim 13
Dependent Claim
38 words
The system of claim 10, wherein said optical radiation detector comprises at least one of the group consisting of silicon carbide photodiodes, gallium phosphide photodiodes, silicon photodiodes, gallium nitride photosensitive devices, gallium arsenide photosensitive devices, and combinations thereof.
Claim 14
Independent Claim
51 words
A method of monitoring combustion dynamics within a gas turbine combustor, comprising: detecting optical emission from a combustion flame in the combustor to produce a detector signal; and monitoring at least one peak frequency component of the detector signal as an indicator of a systematic gas pressure vibration related to combustion.
Claim 15
Independent Claim
51 words
A method of monitoring combustion dynamics within a gas turbine combustor, comprising: detecting optical emission from a combustion flame in the combustor to produce a detector signal; and monitoring at least one peak frequency component of the detector signal as an indicator of a systematic gas pressure vibration related to combustion.
Claim 16
Dependent Claim
42 words
The method of claim 13 wherein the step of monitoring at least one peak frequency component of the detector signal comprises taking the ratio of AC and DC detector signal components to determine dynamic amplitude of the at least one frequency component.
Claim 17
Dependent Claim
24 words
The method of claim 13 wherein the step of detecting optical emission from a combustion flame comprises detecting ultraviolet radiation emitted by said flame.
Claim 18
Dependent Claim
32 words
The method of claim 13 including the additional step of dynamically controlling application of combustion fuel and air to the combustor in response to magnitude of the at least one frequency component.
Claim 19
Dependent Claim
21 words
The method of claim 13 including the additional step of utilizing the detected optical emission as an indication of flame intensity.
Claim 20
Independent Claim
51 words
A method of monitoring combustion dynamics within a gas turbine combustor, comprising: detecting optical emission from a combustion flame in the combustor to produce a detector signal; and monitoring a plurality of peak frequency components of the detector signal as an indicator of a systematic gas pressure vibration related to combustion.
Claim 21
Independent Claim
51 words
A method of monitoring combustion dynamics within a gas turbine combustor, comprising: detecting optical emission from a combustion flame in the combustor to produce a detector signal; and monitoring a plurality of peak frequency components of the detector signal as an indicator of a systematic gas pressure vibration related to combustion.
Claim 22
Dependent Claim
42 words
The method of claim 18 wherein the step of monitoring a plurality of peak frequency components of the detector signal comprises taking the ratio of AC and DC detector signal components to determine dynamic amplitudes of the plurality of peak frequency components.
Claim 23
Dependent Claim
31 words
The method of claim 18 including the additional step of controlling application of combustion fuel and air to the combustor in response to magnitudes of the plurality of peak frequency components.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-13 | 2000-02-12 | 2000-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-13 | 2004-02-12 | 2004-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-13 | 2008-02-12 | 2008-08-13 | $7700.00 | Window Closed / Lapsed |