Metal detection security doors, also known as metal detection doors, referred to as security doors for short, are used in subways, stations, railway stations, schools, exhibition halls, courts, procuratorates, police stations, entertainment venues and other important occasions, the main function is to detect each The banned metal articles can also be used in hardware factories, electronics factories, and precious metal factories to prevent employees from carrying precious metals and leave the company to cause company losses. This is one of the most widely used anti-theft tools in factories.
The metal detection security door has different noun explanations according to different functions. Here I will make an introduction based on commonly used nouns.
1. WTMD: Through-type metal detectors.
2. Sensitivity: The parameter used to define the size of the metal object that generates the alarm. The sensitivity increases, and the metal object that can be detected is smaller in size.
3. Discrimination: The distinction between WTMD detection doors does not have the ability to harm items and weapons. The alarm rate of the WTMD security checkpoint at the security checkpoint can indicate the identification capability of the equipment. The identification power is affected by various factors such as: sensitivity level, personnel appearance, season (climate warm and cold) and so on.
4. Useless alarm: (garbage alarm) Alarm caused by non-hazardous metal objects carried by the person passing the WTMD detection door.
5, false alarm: alarm caused by reasons other than metal features (such as electronic interference). For metal detection security doors, alarms (useful or useless) caused by metal objects are not false alarms.
6. Alarm rate: The percentage of alarms caused by metal objects accounted for the total number of people passing WTMD detection doors. The alarm rate is affected by the recognition ability of WTMD detection doors. If the recognition power is poor, for example, multiple alarms are caused by Hazardous metal items are caused by higher alarm rates. Attention! The warnings of summer birds that are caused by electronic interference or other than the items carried through the WTMD detection doors are not included in the alarm rate range.
7. Pass rate: The maximum number of persons allowed to pass in a given period of time without affecting the detection performance of the WTMD detection door. The pass rate indicates the ability of the WTMD detector door to resume standby after the person passes. In practice, due to the limitations of the inspection procedure and the maximum walking speed of the person, the maximum pass rate is only theoretically literary and usually cannot be achieved.
8. Object velocity response: The ability of the WTMD detector door to maintain a constant sensitivity level when passing through at different speeds.
9. Calibration: According to the requirements of the operation site, in order to achieve the best performance, set the parameters of WTMD.
10. Side-by-side use: If two or more WTMD security gates operating side by side are spaced too close together, their electromagnetic fields will affect each other's operation. By using different operating frequencies, interference between neighboring WTMD detection gates can be reduced.
11. Operating frequency: The electromagnetic field frequency generated by the WTMD detection gate. In general, the WTMD detection gate maintains uniform sensitivity throughout the detection area. The detection uniformity directly affects the recognition ability of the WTMD detector door. In general, the sensitivity of the WTMD detector gate is set based on the weakest position of the detection area. If the detection uniformity is poor, it may lead to unnecessary high sensitivity at other locations within the channel, which significantly reduces the recognition power. When testing the detection uniformity of WTMD detection doors, physical objects such as weapons or simulation weapons should always be used. The use of a cylinder or sphere as a test object may give false indications of the true detection uniformity of the WTMD detection gate.
12. Anti-interference: The operation of the WTMD detector door may be affected by electrical or mechanical interference. Electronic interference is usually caused by other electronic devices located near the installation site. Electronic interference may be conducted through the main power line or it may be radiated. Mechanical disturbances are caused by moving metal objects near the WTMD detection door, behind the wall or under ground structures. Only with effective hardware and software filtering and a special coil design can we achieve good noise immunity.
13. Key test objects: In a group of test objects, the most difficult to detect object requires the highest detection sensitivity.
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