The detection target and the environment must have non-relevance considerations: in the actual environment, there are many targets that may trigger alarms or produce false alarms, such as insects, birds, cats, dogs and other harmless small animals, vehicles in adjacent lanes, Pedestrians passing by, plant branches and leaves moving in the wind, high and low voltage electrical pipelines or radio wave transmitting equipment and lighting fixtures, etc. Therefore, any infrared detector should not be affected by these targets. If this principle is ignored in the application, it may cause a constantly troubled false alarm rate.
The installation environment of infrared detectors must have a certain blocking ability: infrared detectors, especially outdoor point-to-point contrast detectors, must have a certain height or width in the installation environment to achieve a certain protection effect, and the target should not be allowed Skip or even step over, this application principle is basic and necessary.
Technical principle of infrared anti-theft detector
The installation of the detector must be invisible and invisible: the installation of infrared detectors is effective, so in order for the detector to take advantage of the invisible and invisible detection advantages, the equipment must be installed to hide or prevent the target from being detected. Therefore, it is necessary to carefully match the appearance and environmental landscape to avoid unnecessary misunderstandings or make the target suspicious.
The installation and application of the detector should consider the terrain elements: the infrared detector will be affected by the terrain in the use environment during installation, so it is necessary to pay attention to the slope height difference, the step height difference and the height difference of the two buildings or the terrain that crosses the ditch and culvert. There will be no protection loopholes due to the influence of different application choices.
Detectors must be convenient for system integration and construction: infrared detectors are usually not all of the protection system. They are usually used with access control or video surveillance systems. Especially the monitoring image linkage signal must be synchronized and real-time, so in the signal linkage and connection Part of the design and construction must be very convenient for the system connection integration and construction of the contractor. Therefore, the interface structure of the detector must not only be suitable for various weather environments, but its signal format must also be easy to connect with various control equipment.
Detectors should be harmless to human eyes: In the application of optical beams, infrared detectors must be considered harmless to human eyes. This is an important consideration for the application of intrusion detectors. For active detectors currently used in the market, a laser beam called a laser detector may cause damage to human eyes. Even under the irradiation of a general active microwave detector, it may also cause damage to the human body. Therefore, in principle, the application of light beams that cause any harm to the human body should be avoided.
The detector must have multiple detection application functions: due to the different environments and target intrusion methods, the functionality and countermeasures of the infrared detector must be diversified, so the multi-discrimination detection method is also necessary for the application of the detector Principles to pay attention to.
The selection of detectors must be timely response: because most of the detectors are located in remote intrusion prevention areas, the real-time response of the alarm is absolutely necessary. From the alarm to the confirmation, it is generally required to confirm the scene within a few seconds. The real-time status content is used as the processing basis, so real-time is also an important application principle of infrared detector type. Usually the detection speed of the detector can transmit the detection signal from the detection end to the alarm host within a few milliseconds. This is already a very fast transmission speed. However, due to the lack of intuitive graphical interface, it will be caused by human eyes. Delays, so the real-time performance of infrared detectors is a very important application key to the product.
The more beams, the better the blocking performance: the selection principle of infrared detectors in single beam, double beam, four beam or more beam wall detectors, usually use dual beam active infrared detectors. In terms of ergonomics, the detection area of the human body is about 50-70cm in frontal width of the body and 20-40cm in lateral width. If the environment is wide and single or dual-beam active infrared detection equipment is used, the upper half of the detector may not be blocked. One of the rays in the lower part or the lower half will cause false alarms. Of course, the use of four-beam or more beam infrared detectors will reduce the probability of such false negatives.
The above are the basic principles of infrared detectors in product selection and application. These principles are all matters to be paid attention to during product application.
