| 摘要 |
PROBLEM TO BE SOLVED: To provide a flame detector including a window material configuration capable of improving a degree of separation between flame and various types of light sources being present in a tunnel.SOLUTION: A flame detector includes: a photodiode (1) for detecting an infrared region; a pyroelectric element (2) for detecting mid-infrared region; and window material structures (11, 12, 14, and 15) provided on front faces of the photodiode and the pyroelectric element. The flame detector, after discriminating the flame from a light source, detects an occurrence of flame on the basis of a comparison between an output of the photodiode and an output of the pyroelectric element with respect to a same detection object. A window material capable of moving a short-wavelength-side sensitivity area of the pyroelectric element to a long wavelength side are employed as the window material structures (14 and 15) provided on the front face of the pyroelectric element so as to eliminate an overlapped sensitivity area of the sensitivity areas of the photodiode and the pyroelectric element. |
