Flame detector using a discrete fourier transform to process amp

Details Flame detector using a discrete fourier transform to process amp Flame detector using a discrete fourier transform to process amp

1990-10-31

1991-12-17

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

250554, 364576, G08B 1712

Patent

active

050737694

ABSTRACT:
A circuit for detecting presence of a flame receives a flame signal from a standard photocell positioned to receive radiation from the flame and digitally processes the amplitude variations in the photocell's output to sense for the presence of frequencies near a frequency which is characteristic of a flame. The frequencies substantially higher than the characteristic frequency are filtered from the signal, and the remaining signal is sampled at a frequency which is preferably four times the characteristic frequency. The samples are converted to digital values and processed using a discrete Fourier transform. If the value resulting from the transform operation exceeds a preselected value, presence of a flame is essentially certain. Such digital processing allows use of a dedicated microcircuit or a microprocessor for the flame sensing function and avoids the need for many large discrete components.

REFERENCES:
patent: 4709155 (1987-11-01), Yamaguchi
patent: 4750142 (1988-06-01), Akiba et al.
patent: 4785292 (1988-11-01), Kern et al.
patent: 4866420 (1989-09-01), Meyer, Jr.
patent: 4983853 (1991-01-01), Davall
Japanese open application 61-130833, titled "Flame Monitor", author-Koji Yamamoto, 6/86.

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