发明名称 |
Fire sensor device |
摘要 |
A fire sensor device of the type capable of detecting flame and smoke. The fire sensor device has a detector unit having a condenser lens for determining variations in the brightness of a space on the basis of variations in the illumination thereof which occur due to the movement of flames of a fire or the presence of smoke therein. The fire sensor device has two frequency-detection circuits which have different set points and to which the detector unit is connected. The frequency and amplitude of a signal output from the detector unit and the number of pulses generated by the detector unit are computed, and the presence of a fire is detected on the basis of the duration of the signal.
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申请公布号 |
US4639605(A) |
申请公布日期 |
1987.01.27 |
申请号 |
US19840601176 |
申请日期 |
1984.04.17 |
申请人 |
SEKI, HIROSHI |
发明人 |
SEKI, HIROSHI;KATAISHI, RYUICHIRO |
分类号 |
G01J1/42;G08B17/10;G08B17/103;G08B17/12;(IPC1-7):G08B17/12 |
主分类号 |
G01J1/42 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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