Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-11-06
1997-04-29
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
340577, 25033905, 25033915, 250340, 250372, G08B 1712
Patent
active
056253427
ABSTRACT:
A flame detector employs a plurality of wavelength selective radiation detectors and a digital signal processor programmed to analyze each of the detector signals, and determine whether radiation is received directly from a small flame source that warrants generation of an alarm. The processor's algorithm employs a normalized cross-correlation analysis of the detector signals to discriminate between radiation received directly from a flame and radiation received from a reflection of a flame to insure that reflections will not trigger an alarm. In addition, the algorithm employs a Fast Fourier Transform (FFT) frequency spectrum analysis of one of the detector signals to discriminate between flames of different sizes. In a specific application, the detector incorporates two infrared (IR) detectors and one ultraviolet (UV) detector for discriminating between a directly sensed small hydrogen flame, and reflections from a large hydrogen flame. The signals generated by each of the detectors are sampled and digitized for analysis by the digital signal processor, preferably 250 times a second. A sliding time window of approximately 30 seconds of detector data is created using FIFO memories.
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Barnes Heidi L.
Hall Gregory H.
Medelius Pedro J.
Simpson Howard J.
Smith Harvey S.
Hofsass Jeffery
Lee Benjamin C.
Sheehan William J.
The United States of America as represented by the Administrator
Vrioni Beth A.
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