System for detection of passage of object or intrusion of light beam on sensible zone, has analysis unit detecting changes in image during partial or total disconnection of light beam in triggering of alarm event

摘要

The system has a reflector (3) designed in such a way that slight vibration or rotation is realized by the reflector, a part or parts of luminous flux emitted by a light source (1) follows a path or constant paths to bring the luminous flux toward a video camera (2). An analysis unit (4) detects changes in image during partial or total disconnection of light beam while triggering an alarm according to a determined configuration of the analysis unit.