| 摘要 |
PROBLEM TO BE SOLVED: To certainly determine the presence/absence of combustion flame on the basis of the simultaneity of time variation of a light receiving output from a plurality of light receiving units for a plurality of wavelength bands of radiation energy radiated from combustion flame.SOLUTION: A plurality of light receiving units 12a and 12b are disposed. The light receiving units 12a and 12b output light receiving signals E1 and E2 for which different wavelength bands are observed, of the radiation energy. A determination unit 15 sets, as one element for determining the presence/absence of combustion flame, the mutual correlation between the light receiving signals corresponding a predetermined period that are observed and output by the light receiving units 12a and 12b at a substantially same time. When the correlation is high, the determination unit allows flame determination based on the added light receiving signal E1, for example. When the correlation is low, the determination unit suppresses the flame determination.SELECTED DRAWING: Figure 1 |
