Method and detector for detecting a flame

Details Method and detector for detecting a flame Method and detector for detecting a flame

1995-12-19

1997-01-14

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340577, 250554, G08B 1712

Patent

active

055944213

ABSTRACT:
A flame is detected by signal analysis for intensity variations in radiation received by a sensor. A low-frequency spectrum of the signal is analyzed for mid- and cut-off frequencies, and the signal is classified as periodic or non-periodic. Periodic signals with a mid-frequency (.omega..sub.mp) above a first frequency value (G.sub.1), and non-periodic signals with a cut-off frequency (.omega..sub.gc) above a second frequency value (G.sub.2) are classified as interfering signals. The first frequency value is determined by the flicker frequency of a stationary flame having a magnitude corresponding to a flame of minimum magnitude to be detected. The second frequency value is selected greater than the first frequency value (G.sub.1).

REFERENCES:
patent: 3739365 (1973-06-01), Muller
patent: 4206454 (1980-06-01), Schapisa
patent: 4280058 (1981-07-01), Tar
patent: 4988884 (1991-01-01), Dunbar
patent: 5434560 (1995-07-01), King

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