Flame detecting method, flame detector and flame detector operation

摘要

The present invention discloses it is a kind of for flame detecting method be characterized in that signal analysis in Strength Changes transmitting radiative flame, wherein be located at a certain frequency band except signal be interference signal. The method is characterized in that, change frequency in analyzing radiation, thus intermediate frequency ({ omega } imp, { omega } imc) radiation of intensity and variation ({ omega } igp of cutoff frequency, { omega } igc) radiation intensity mutation analysis and be classified as periodically or non-periodically signal, thus the variation of the intensity of the periodic signal and intermediate frequency ({ omega } imp) is higher than second frequency value (GI2) in radiation in variation of the radiation higher than the intensity of first frequency value (GI1) and aperiodic signal and cutoff frequency ({ omega } igc) for interference signal. First frequency value (GI1) is selected as being greater than first frequency value (GI1) with detected second frequency value (GI2) by stablizing flame flicking frequency corresponding to the flame size with minimum amplitude. Flame detector includes at least one Fire Radiation sensor (1) for realizing the above method, assessment circuit is connected to sensor, for analyzing the sensor signal, to which assessment circuit has received radiation and intermediate frequency ({ omega } imp for analyzing, { omega } imc), cutoff frequency ({ omega } igp, { omega } igc) and its Strength Changes radiation, and for by sensor (1) signal then frequency. In the present invention, the operation flame detector for the invention also advocated contains fuzzy control unit and evaluation criterion to fuzzy control unit.