FLAME MONITORING DEVICE AND FLAME MONITORING METHOD

摘要

A flame monitoring device (10) includes: an infrared light detection unit (12a, 12b) configured to detect infrared light in a specific wavelength range in infrared light radiated from flame (1); a Fourier transformation unit (22) configured to obtain variable frequency components of an infrared light signal intensity of the infrared light detected by the infrared light detection unit (12a, 12b); and a determination unit (24) configured to determine a size of the flame based on a position of a frequency component having a spectral intensity exceeding a threshold value in a distribution in frequency of the variable frequency components obtained by the Fourier transformation unit (22).