Importance

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Abstract

In a flame detecting apparatus for detecting the flame of fire or the like using a sensor 1, a signal processing unit 3 includes a span counting section 5 for dividing a time base into several time spans, each having a predetermined time interval, and counting the number of signals output from the sensor 1 as a count value for each span, a count value storage section 6 for storing the count value for each span output from the span counting section 5, and an calculation section 7 for judging the occurrence of flame by taking into account the count values counted for the past spans which have been stored in the count value storage section 6, as well as the count value of the latest span, when the count value of the latest span is output from the span counting section 5. Because the flame occurrence judgment is preformed by taking into consideration the accumulated values of the preceding spans together with the accumulated value of the latest span, not only strong flame of short duration but also weak flame of short duration can accurately be detected.

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First Claim