Intrusion detection system for building, has cable disposed on part of circumference of leaf or frame and forming transducer for transforming force exerted on cable into measurable electrical magnitude

摘要

The system has a cable (10) disposed on a part of circumference of a leaf or a frame and forming a transducer for transforming a force exerted on the cable into a measurable electrical magnitude. A force detection device (4) has a capacitance meter (20) associated to a controller (22) in order to detect the exerted force. The meter has an inductor (30) connected to a core (12) of the cable to form a LC circuit.