Intrusion alarm apparatus
作者： Jr. Louis H. La Forge
DOI:
关键词: Acoustics 、 Proximity sensor 、 Conductor 、 Signal 、 Inductive sensor 、 Engineering 、 Intrusion detection system 、 Electronic engineering 、 Antenna (radio) 、 Phase-locked loop 、 Position sensor
摘要: An intrusion detection apparatus employing two or more diverse types of sensors for sensing entries into a room, building other enclosure. The are connected to signal processor which processes sensor output signals indicate when an has occured. One type is local includes conductor in combination with phase locked loop. Whenever intruding object within close proximity the and disturbs field, equilibrium condition loop disturbed provide signal. A second one embodiment omni-directional antenna having field located overlapping conductor. disturbed, disturbances detected by if proper time relationship exists between them.
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