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Currently, the most widely used security equipment is the X-ray security inspection machine. When the passenger's baggage passes through the security inspection door, the X-rays are scanned and inspected in sequence. X-rays are electromagnetic waves that are shorter than the wavelength of visible light, have a stronger penetrating ability than visible light, and can even penetrate a certain thickness of steel plate. Since the density of various items in the baggage is different, there is a significant difference in the degree of X-ray absorption. Therefore, the depth of the image displayed on the screen is also different, depending on the different shadows displayed on the screen by various items. After an objective comparison analysis, the correct inspection and judgment can be made.
Using two sets of sensor arrays, high-energy and low-energy ray signals can be detected, and high-energy and low-energy signals are compared with each other to obtain the atomic number of the detected object. After X-ray inspection, the contents of the baggage will display a rough shape on the display and display in yellow, green, black, etc. (specifically as shown below). The security inspector can find out if there is any contraband in the baggage from the screen. In addition, an X-ray signal that has been projected to a certain intensity can be turned into an electric signal by an electronic device, and an alarm is used to alarm. Since electronic components may interfere with X-rays, it is often required to take out items such as laptops during security screening.
Another type of equipment that is often used is the metal detector door, which works by using the principle of electromagnetic induction. There are rapidly changing magnetic fields on both sides of the security door. These magnetic fields do not have any effect on the human body, except for metals, because the metal generates eddy currents under rapidly changing magnetic fields, and eddy currents generate a magnetic field when the security gate detects When the new magnetic field is reached, the security door will automatically sound or flash. In addition, devices similar in principle are hand-held metal detectors. When the metal detector door alarms, the location of the metal object can be found using a hand-held metal detector.
The above two are the most commonly used security inspection methods, but with the rapid development of science and technology, more advanced security inspection methods with long distance, non-contact and higher sensitivity are being continuously developed.