发明名称 |
INFRARED INTRUSION ALARM SYSTEM WITH TEMPERATURE RESPONSIVE THRESHOLD LEVEL |
摘要 |
<p>Intrusion detector of the type in which the presence of an intruder is detected by infrared heat energy emitted by his body. An alarm signal is delivered when the level of radiation detected rises from the ambient level to a threshold level. A temperature responsive circuit adjusts the threshold level and so that the system has a relatively uniform detection range or sensitivity notwithstanding changes in the ambient temperature in the protected area.</p> |
申请公布号 |
GB2013876(B) |
申请公布日期 |
1982.09.08 |
申请号 |
GB19790003531 |
申请日期 |
1979.02.01 |
申请人 |
OPTICAL COATING LABORATORY INC |
发明人 |
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分类号 |
G01J1/42;G08B13/18;G08B13/19;(IPC1-7):08B13/18 |
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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