SYSTEM OF PHOTONIC CONTACTS PRACTICABLE FOR ALARM SYSTEMS

摘要

Novelty: system of photonic contacts cooperating with alarm systems. Constitution: a) the treatment unit susceptible to cooperate with alarm systems and b) the contact placed at the steady frame of the moving elements of a building (e.g window &door frames) and comprising a source of photons, a receiver of photons and an electronic circuit turning on and off -at a precise rhythm- the source of photons; the receiver of photons detects the changes of the bundle of the photons reflected on the frame in case of displacement thereof and inform the treatment unit warning, in turn, the alarm system. Advantages: compared to magnetic contacts, the invented system is not influenced by magnetic fields making the magnetic contacts inactive; it is not influenced by wanton lighting or by intermittence of foreign bodies maliciously utilised to cut off the bundles of photons; the contact has one single accessory -instead of two magnetic contacts- so that its application to narrow window-door frames becomes easier; less wires required.