what is the operation principle of the security gate of the court< p>
law is the basic of a country's existence, and the court is the place where the law is enforced. law is very important for a country. if a country has no system, then everyone has centered on their own interests, and the country will no longer exist. the existence of law can well restrict the people and prevent them from harming the interests of most people for their own interests. if someone does, they will be punished, and their crimes will be tried by the court to make the final punishment. without the judgment of the court, he would not have violated the law, so some lunatic people attacked the court in order not to be judged by the court, resulting in casualties of court staff and observers, making the court unable to conduct a normal trial. this not only hurts the lives of innocent people, but also seriously challenges the authority of the court. therefore, the security work of the court must be done well. to do a good job in the security work of the court, it is not possible to rely on manpower alone. manpower is sometimes poor, so we must rely on the power of machines. the security inspection equipment is developed to cope with these situations, and the security inspection machine is the most widely used in the security inspection equipment, security doors have also been applied to these areas. so what is the operation principle of the security gate of the court? why can he keep the court safe?
the security door of the court, also known as the metal detection door of the court, that is, it is a device used to detect metal objects, and the supplementary controlled knives, pistols and other things are metal, so it can not escape the "magic eye" of the security door of the court. the security door of the court adopts the principle of electromagnetic induction. the sinusoidal oscillation is generated by the crystal oscillator, and then divided into left and right sinusoidal waves by the frequency divider. after the power is amplified by the triode and the coil, it is input into the large coil of the door panel for electromagnetic wave transmission, and then received by the coil in the door. after receiving, the received signal is compared with the reference signal. after finding the change, change the output level of the acquisition card, and then the processor will scan the data of each location, finally judge the location of the metal, and trigger the alarm. the operation principle of the security gate of the court is so simple, not as complex as people think.
