| 摘要 |
PURPOSE:To enhance detection accuracy by widening a visual field for monitoring a fire to a large extent, by performing the detection of flame and the transmission of detected light by using an optical fiber and attaching one or more of said optical fiber. CONSTITUTION:The light of flame is not only detected but also transmitted by an optical fiber. That is, three grooves are formed to the leading end part of a lighting head 2 toward the leading end opening part 3a thereof at different angles and three optical fibers (4a, 4b, 4c) are received in and arranged to said grooves so as to have definite visual fields around wires 5a, 5b, 5c. Three optical fibers 4 reach the window box 8 attached to the base part of an outer cylinder 1 through a connector 7. Cooling air A entering the window box 8 passes through an inner cylinder 6 and a part thereof is injected from the circumference of the lighting head 2 while the other part is injected from the opening part 3a provided to the leading end of the lighting head 2 through the optical fiber receiving grooves 2b of said head 2 to cool the main body and the optical fibers received therein.
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