Dual sensitivity intrusion detection system
First Claim
1. A system for protecting a zone against human aggression, comprising at least two circuits of sensors for detection of human presence, said sensor circuits arranged within said zone and capable of producing electric signals when they detect a human presence, response means activated by said electric signals for indicating human presence, electronic processing means arranged between the sensors for detection of human presence and the response means, to operate first response means when they receive an electrical signal from a detection sensor of a first circuit of sensors and second response means when they receive an electrical signal from a detection sensor of a second circuit of sensors, said electronic processing means comprising means to increase the sensitivity of the sensors of the second circuit of sensors at the time of reception of a signal from a sensor of the first circuit of sensors.
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Accused Products
Abstract
At least two circuits of sensors for detection of human presence are arranged in a protected zone and are capable of producing electric signals when they detect a human presence. In a preferred embodiment, when a human presence is detected by a first sensor circuit, the sensitivity of the sensors of the second sensor circuit is increased.
49 Citations
10 Claims
- 1. A system for protecting a zone against human aggression, comprising at least two circuits of sensors for detection of human presence, said sensor circuits arranged within said zone and capable of producing electric signals when they detect a human presence, response means activated by said electric signals for indicating human presence, electronic processing means arranged between the sensors for detection of human presence and the response means, to operate first response means when they receive an electrical signal from a detection sensor of a first circuit of sensors and second response means when they receive an electrical signal from a detection sensor of a second circuit of sensors, said electronic processing means comprising means to increase the sensitivity of the sensors of the second circuit of sensors at the time of reception of a signal from a sensor of the first circuit of sensors.
Specification