DEVICE FOR DETECTION OF SECURED SPACE INVASION Russian patent published in 2008 - IPC G08B13/00 

FIELD: electricity.

SUBSTANCE: invention is related to technology of alarm signals generation in passive systems of invasion detection and may be used in automatics systems, special and household appliances. Device for detection of secured space invasion, which contains element sensitive to electromagnetic field (EMF), low-pass filter, unit of signal digital processing and of decision-making about invasion, is characterized by the fact that element sensitive to EMF is made as operational amplifier, spanned with frequency-dependent negative feedback, with noninverting input, which is grounded through resistor of more than 10⁹ Ohm and connected with its input to input of digital low-pass filter, output of which is connected to input of signal digital processing and decision-making about invasion unit, one of the outputs of which is connected to the input of alarm formation stage, and the other in its turn is connected to digital filter control circuit.

EFFECT: creates more noise-immune and more EMF-sensitive device of invasion detection.

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