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Shock contact sensors are designed to block various glazed structures (windows, showcases, stained glass windows, etc.) for breaking. The sensors consist of a signal processing unit (SPU) and 5... 15 glass breaking sensors (GBS). The location of the components of the sensors (SPU and GBS) is determined by the number, relative location and area of the blocked glass panels.
Piezoelectric sensors are designed to lock building structures (walls, floor, ceiling, etc.) and individual items (safes, metal cabinets, ATMs, etc.) for destruction. When determining the number of sensors of this type and the place of their installation on the protected structure, it must be taken into account that it is possible to use them with 100 or 75% coverage of the blocked area. The area of each unprotected area of the blocked surface should not exceed 0.1 square meters.
Optoelectronic sensors are divided into active and passive. Active optoelectronic sensors generate an alarm notification when the reflected flow changes (single-position sensors) or the received flow stops (changes) (two-position sensors)
of infrared radiation energy caused by the movement of the intruder in the detection zone. The detection zone of such sensors has the form of a beam barrier formed by one or more parallel narrowly directed beams located in a vertical plane. The detection zones of different sensors differ, as a rule, in the length and number of beams. Structurally active optoelectronic sensors, as a rule, consist of two separate units: the radiation unit (RaU) and the receiver unit (ReU), spaced over the working distance (range).
Active optoelectronic sensors are used to protect internal and external perimeters, windows, storefronts and approaches to individual objects (safes, museum exhibits, etc.). Passive optoelectronic sensors are the most widespread, because with the help of specially designed optical systems (Fresnel lenses), you can easily and quickly receive detection zones of various shapes and sizes and use them to protect premises, building structures and individual objects.
The principle of operation of the sensors is based on the registration of the difference between the intensity of infrared radiation emanating from the human body and the background temperature of the environment. The sensitive element of the sensor is a pyroelectric converter (pyroconverter), on which infrared radiation is focused using a mirror or lens optical system (the latter are the most widespread).
The sensor detection zone is a spatial discrete system consisting of elementary sensitive zones in the form of rays arranged in one or more tiers, or in the form of thin wide plates arranged in a vertical plane (such as "curtain").
Due to the possibility of forming detection zones of various configurations, passive infrared optical electronic sensors have universal application and can be used to block the volumes of rooms, places of concentration of valuables, corridors, internal perimeters, aisles between shelves, window and door openings, floors, ceilings, rooms with the presence of small animals, storage rooms, etc.