CAPACITANCE DEVICE FOR SECURITY ALARM SYSTEM Russian patent published in 2017 - IPC G08B13/26 

FIELD: radio engineering, communication.

SUBSTANCE: device contains HF-generator, sequentially coupled with a signal processing channel including an input LC-contour connected to an antenna sensor and detector, and lowpass filter, the second signal processing channel that is identical to the first channel and contains an input LC-contour connected to an antenna sensor and detector and lowpass filter, the input of which is connected to the output of the detector. The output of one signal processing channel is connected to the input of the amplifier, and the output of the second channel is connected to the common wire of the gain circuit, without connecting the common wire of the amplifier to the common wire of the signal processing channels. Power is supplied to the amplifier from a separate source, and a measurement bridge is introduced into the capacitance device, remote control of operability.

EFFECT: balance of the bridge in the active and reactive component of the antenna sensor, possibility of remote control of the capacitance device operability.

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