Several application principles of infrared anti-theft detector

There must be non-relevant considerations between the detection target and the environment: in the actual environment, there are many targets that may trigger an alarm or cause false alarms, such as insects, birds, cats, dogs and other harmless animals, vehicles in adjacent lanes, Pedestrians passing by, wind-floating plant foliage, high and low voltage electrical lines or radio wave launching equipment and lighting fixtures. Therefore, any infrared detector should not be affected by these targets. If this principle is ignored in the application, it may cause a constant false alarm rate.


Infrared detector setting environment must have certain resistance: infrared detector setting, especially outdoor point-to-point contrast detector, in order to achieve a true protective effect, the installation environment should have a certain height or width, can not let the target Skip or even cross over, this application principle is basic and necessary.

Detector erection must be invisible and invisible: the installation of infrared detectors is expensive, so in order to make the detectors have the advantage of invisible and invisible detection, it must be hidden or the target is not detected in the installation of the equipment. The feeling of measurement, therefore must be carefully done to match the appearance and the environment landscape, to avoid causing unnecessary misunderstandings or to make the target wary.

The detector installation application should consider the topographical elements: the infrared detector will encounter the influence of the terrain in the environment during installation. Therefore, it must be noted that the slope height difference, the step height difference and the difference between the two buildings or the terrain of the water culvert There will be no protection holes in the impact of different application choices.

The detector must be convenient for system integration and construction: the infrared detector is usually not the whole of the protection system. It is generally used together with the access control or video surveillance system. In particular, the surveillance image linkage signal must be synchronized in real time, so the signal linkage and connection Part of the design and construction must be very convenient for the engineering system integration and construction of the project. Therefore, the interface structure of the detector is not only applicable to various weather environments, but also its signal format must be easily connected to various control devices.

The detector should be harmless to the human eye: the infrared detector should be considered harmless to the human eye in optical beam applications, which is an important consideration in the application of intrusion detectors. At present, active probes are used in the market. A laser beam called a laser detector may cause damage to the human eye. Even under the action of a general active microwave detector, it may cause certain damage to the human body. Therefore, in principle, it is necessary to avoid beams that cause any harm to the human body.

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

The choice of detectors must be a timely response: since the detectors are mostly located in remote intrusion prevention areas, the real-time nature of the alarm response is absolutely necessary. From alarm to confirmation, it is generally required to confirm the scene within a few seconds. Real-time status content is used as the basis for processing, so real-time performance is also an important application principle of the infrared detector type. Usually, the sensing speed of the detector can transmit the detection signal from the detection end to the alarm host within a few milliseconds. This is a very fast transmission speed, but because of the lack of an intuitive graphical interface, it is judged by the human eye. Delays, so the real-time nature of the infrared detector is the key to the application of the product.

The more the beam, of course, the better the blocking: the selection principle of the beam detector of the single-beam, double-beam, four-beam or more beam of the infrared detector is usually based on the dual-beam active infrared detector. Ergonomically, the detection area of ​​the human body is about 50-70cm in front of the body and 20-40cm in width on the side. If the environment is wide and single or double-beam active infrared detectors are used, the upper half of the detector may not be blocked. One of the rays in the middle or the lower part produces an alarm false negative. Of course, using four-beam or more-beam infrared detectors will reduce the chance of false negatives.

The above are the basic principles of infrared detectors in product selection and application. These principles are all matters to be aware of when applying products.

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