发明名称 |
Size discriminating dual element PIR detector |
摘要 |
A dual element PIR detector for a security system uses a series of beams in selected areas to limit the amount of radiation received from small domestic pets. A series of alternating beams define dead zones and the beams and dead zones provide size discrimination where a small domestic cat or other small pet does not have sufficient size to cause IR responses in two sensors sufficient to cause an alarm condition.
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申请公布号 |
US5923250(A) |
申请公布日期 |
1999.07.13 |
申请号 |
US19970789386 |
申请日期 |
1997.01.28 |
申请人 |
DIGITAL SECURITY CONTROLS LTD. |
发明人 |
PILDNER, REINHART K.;MCKENZIE, DAVID |
分类号 |
G08B13/191;(IPC1-7):G08B13/18 |
主分类号 |
G08B13/191 |
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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