Method and apparatus for detecting flame with adjustable optical

Details Method and apparatus for detecting flame with adjustable optical Method and apparatus for detecting flame with adjustable optical

1990-11-06

1992-04-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Flame light source

250216, 250226, 340578, G01J 350, G08B 1712

Patent

active

051071282

ABSTRACT:
A method of detecting flame within a region where flame is expected. Radiation emissions from the region are measured within selected portions of the visible and infra-red frequency bands. Spectral characteristics of the two measurements, including their auto spectra, coherency and transfer function, are derived. The derived spectral characteristics are compared with prestored spectral signatures representative of the spectral characteristics of radiation emitted from the region within the selected portions of the visible and infra-red frequency bands while known flame conditions prevail within the region--thereby estimating the deviation of the derived spectral characteristics from the prestored spectral signatures. The deviations aforesaid are compared with predetermined threshold alarm values to assess the presence or absence of flame.

REFERENCES:
patent: 3444544 (1969-05-01), Pearson et al.
patent: 3689773 (1972-09-01), Wheeler
patent: 3708674 (1973-01-01), Trimpi et al.
patent: 4280058 (1981-07-01), Tar
patent: 4370557 (1983-01-01), Axmark et al.
patent: 4464575 (1984-08-01), Cholin et al.
patent: 4603255 (1986-07-01), Henry et al.
patent: 4671362 (1987-06-01), Odashima
patent: 4710630 (1987-12-01), Kuppenheimer, Jr. et al.
patent: 4713544 (1987-12-01), Grage

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