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Technical principle of infrared anti-theft detector

Dec 24, 2019

Technical principle of infrared anti-theft detector


Detector installation must be insensitive and invisible: the installation of infrared detectors is expensive and effective, so in order to make the detector take advantage of invisible and invisible detection, it must be hidden or the target is not detected in the installation of the device It is necessary to carefully match the appearance with the environmental landscape, so as not to cause unnecessary misunderstandings or make the target wary.


The installation of the detector should consider the terrain elements: the installation of the infrared detector will encounter the influence of the terrain in the use environment. Therefore, it is necessary to pay attention to the slope height difference, the step height difference, the height difference of the two buildings or the terrain across the culvert. There will be no protection loopholes due to the impact of different application choices.


Detectors must be convenient for system integration and construction: Infrared detectors are usually not the entirety of the protection system. They are usually used with access control or video surveillance systems, especially the surveillance image linkage signal must be synchronized and real-time, so the signal linkage and connection Part of the design and construction must be very convenient for the system connection integration and construction of the engineer. 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.


The detector should be harmless to the human eye: In the application of the optical beam, the infrared detector must be considered harmless to the human eye, which is an important consideration for the application of the intrusion detector. For active detectors currently used in the market, a laser beam called a laser detector may cause damage to the human eye, and even if it is irradiated by a general active microwave detector, it may cause certain harm to the human body. Therefore, in principle of application, light beams that cause any harm to the human body should be avoided.


The detector must have multiple detection application functions: due to different environmental and target intrusion methods, the functionality and countermeasures of the infrared detector must be diversified, so the multi-identification detection method is also necessary for the detector application. Pay attention to the principle.


The selection of the detector must be timely: Because the detector is mostly located in a distant intrusion prevention area, the real-time nature of the alarm response 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 the infrared detector type. Generally, 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, but due to the lack of an intuitive graphical interface, it will be judged by the human eye. Delay, so the real-time nature of the infrared detector is a very important application key of the product.


The more beams of course, the better the blocking performance: the selection principle of infrared detectors in single-beam, double-beam, four-beam or more beam wall detectors, usually the dual-beam active infrared detector is the main use case. In terms of ergonomics, the detection area of the human body is about 50-70cm on the front of the body and 20-40cm on the side. If the environment is wide and a single or dual beam active infrared detection instrument is used, the upper half of the detector may not be blocked One or more of the rays in the lower half may cause a false alarm. Of course, the use of four or more beam infrared detectors will reduce the possibility of such false alarms.


The above are the basic principles of infrared detectors in product selection and application. These principles are all matters needing attention in product application.