BARRIER-TYPE DEVICE FOR DETECTING INTRUDERS Russian patent published in 2021 - IPC G08B13/12 

FIELD: alarm systems.

SUBSTANCE: barrier-type device for detecting intruders includes final and intermediate supports, on which a spring-loaded wired sensitive element is placed in several levels. At least on one of the end supports, a tension signal-transmitting element connected by means of springs to a wired sensitive element is placed, connected to at least one tension control sensor. According to the invention, the sensitive element is made of an odd number of levels of identical cable segments from wires twisted into a pair, including cores of steel and conductive wire, forming an induction sensitive element equipped with a signal-processing unit. In this case, the cable segments form two single-turn eight-shaped differential sensors with the formation of spatial distribution circuits that are sensitive to their movement by the intruder in the constant magnetic field of the Earth. The element transmitting the movement signal is made in the form of a power bar equipped with a group of strain gauges for measuring the applied force to the power bars relatively to the end supports.

EFFECT: increased effectiveness of detecting attempts to overcome the protected perimeter, increased reliability of operation, as well as prevention of false alarms.

3 cl, 4 dwg