Flame detector using a discrete fourier transformer to...

Details Flame detector using a discrete fourier transformer to... Flame detector using a discrete fourier transformer to...

G - Physics

01

N

G01N 21/84 (2006.01) F23N 5/08 (2006.01) G08B 17/12 (2006.01)

Patent

CA 2052278

ABSTRACT OF THE DISCLOSURE 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.

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