CAPACITIVE DEVICE FOR INTRUDER ALARM Russian patent published in 2006 - IPC G08B13/26 

FIELD: engineering of intruder alarms, namely, engineering of devices for signaling about unsanctioned crossing of blocked boundary by an individual, possible use for developing devices for blocking off portions of closed protected boundary or perimeter of object.

SUBSTANCE: device, containing two sensitive elements in form of capacitive antennae, connected to outputs of primary winding of differential transformer, high frequency filter and relay, additionally includes decoupling transformer, key, voltage splitter and digital signaling processor, input of which is connected to output of high frequency filter, first output - to relay input, second output - to first input of voltage splitter, third output - to first input of key, to second input power is sent, output of which is connected to one of outputs belonging to primary winding of decoupling transformer, another output of which is connected to zero potential point of device, one of secondary winding outputs of decoupling transformer is connected to zero potential point of the sensitive element, another output of which is connected to middle point of primary winding of differential transformer, one of secondary winding outputs of which is connected to zero potential point of device, another output of which is connected to second input of voltage splitter, output of which is connected to high frequency filter input.

EFFECT: increased reliability of device due to increased resistance to interference and resistance to weather effects.

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