The walk through metal detector is a kind of detection device for detecting whether personnel carry metal objects, also known as archway metal detector.
Security door is a kind of detection device that detects whether personnel have metal objects, also known as metal detection door. Metal detection security doors are mainly used in airports, stations, large-scale conferences and other public places with a large flow of people to check metal objects hidden on people's bodies, such as guns and controlled knives. A few high-end security inspection doors in the market can realize that when the inspected person passes through the security inspection door and the metal carried by the person exceeds the preset parameter value according to the weight, quantity or shape, the security inspection door will immediately give an alarm and display the location of the metal causing the alarm, so that the security inspection personnel can find the metal articles carried by the person in time. Most of the factory's special security doors only identify whether metal objects are carried, locate and alarm, and prevent products from being taken out of the factory in violation of regulations. The best security door can detect paper clip sized items.
working principle
The principle of the security inspection door is that the crystal oscillator generates 3.5-4.95m sinusoidal oscillation, and the frequency is divided into about 7.6k sinusoidal wave by the frequency divider. After power amplification by the triode and the coil, it is input to the large coil of the door plate (zone 7) for electromagnetic wave transmission, and is received by the coils of zones 1-6 in the door. After receiving, the received signal is compared with the reference signal. After the change is found, the output level of the acquisition card is changed. The CPU scans the data of the acquisition card at six locations within 280 milliseconds to determine the location of the metal and output the display.
2, Structure 1. Door panel structure: it is composed of 1 large coil, 6 small coils, compensation coil and graphite. 2. Chassis structure security door
3, The work flow during detection is CPU detection → one group of infrared is blocked → detect whether the data of each acquisition card changes → alarm → detect another group of infrared → reset and re detect.
