Always take the airport airport these security technologies do you know?

The construction of a large number of airports has made people's travel more and more convenient. Of course, airport security inspections will become more and more strict. But in the airport security procedures, do you know the security technologies and equipment that are swept away on your body and on your luggage?

Airport security is mainly to check whether passengers and their luggage are carrying dangerous goods to ensure the safety of the aircraft and passengers. Generally, there are three procedures, namely, "Prove that you are you", "Is your body safe?", "Is your baggage safe?" With the advancement of science and technology, airport security inspection technology is also constantly improving, and more new technologies are applied to improve security inspection efficiency and ensure accuracy.

First, prove that you are you

This is an important procedure for airport security, using the relevant valid documents to "prove you are you." In the past, the airport used manual inspection to confirm the identity of each passenger. According to the passenger's photo ID, the identity of the passenger and the photo on the document was determined. However, due to the large differences in the photos of the documents and the appearance of the faces, it is sometimes difficult for the staff to identify the identity of the passengers. Therefore, this security line needs to borrow computerized document information management systems and biometrics.

The essence of biometrics is the use of sophisticated computer systems to determine whether a passenger's identity is consistent with a document, or to check whether a passenger is among the list of potentially dangerous individuals identified by the government by examining fingerprints, retinal scans, and facial recognition. At present, the face recognition system has been officially put into use in Shenzhen Airport, which greatly improves the efficiency and accuracy of checking documents.

Second, is your body safe?

When your identity is confirmed, the next step is to go through the designated security checkpoints in order to conduct personal inspections to prevent dangerous goods or contraband. At present, the main personal inspection equipment used at the airport includes metal detectors and security instruments. Metal detectors mainly detect all kinds of metal objects hidden in the human body, including jewelry, electrical components and so on.

The human body security instrument currently used in the market is divided into three types: X-ray, millimeter wave and terahertz wave. Among them, the X-ray detector is a mature and effective detection method for article detection, but because of its high frequency and high energy, it needs to pass through the object to receive from the other end, so it will have certain influence on the human body. There is some controversy.

There are two main types of millimeter wave imaging methods: one is passive and the other is active. Passive imaging equipment is a device that uses millimeter wave aggregation imaging of human radiation. The amount of millimeter wave radiation radiated by an object depends on their physical properties and temperature, and the millimeter wave ratio of human body radiation is compared with metal, ceramic and clothing, and insulation. There are many materials, and millimeter waves can penetrate any insulating material, all clothing fabrics and most building materials.

The active millimeter wave is a millimeter wave from the machine to the human body or the object to be detected, and then reflected back, and the machine receives the reflected millimeter wave and then images it. Most of the active millimeter-wave imaging devices currently used on the market are more accurate than passive. In the face of the millimeter wave imaging equipment, the clothes on the human body are gone. Under the contour of the human body, the coins, buttons, pens, keys, etc. on the person are obviously visible. If the contraband is hidden, it is even more obvious.

The passive terahertz security detector is a terahertz wave emitted by human body temperature. The temperature difference between the human body and the object forms a terahertz wave with different strengths and weaknesses. After the machine receives the processing, it converts and finally realizes the detection imaging. If there are suspicious objects, There will be corresponding shadows on the detected image to achieve the effect of the compartment to check the human body. It can penetrate clothing and discover hidden objects carried by the human body. Its imaging system can distinguish objects of centimeter size. The detectable items include metal, ceramic, plastic, powder, liquid, etc., and because of its low photon energy, There is no ionizing radiation to the human body. Based on the safety of the terahertz wave to the human body and the more effective detection of the substance, the terahertz security instrument will be widely used in security inspection.

3. Is your luggage safe?

While your body is undergoing a security check, your baggage is also X-ray scanned on the security instrument. The X-ray imaging technology currently used at airports is mainly dual-energy X-ray imaging technology, multi-view X-ray technology and CT radiography technology. Among them, compared with the single-energy X-ray inspection system, the dual-energy X-ray can obtain the effective atomic number information of the object and improve the material resolution of the system; the CT technology can form a three-dimensional image of the object and measure the thickness of the substance. At the same time, it is possible to distinguish explosives from other similar substances with low atomic numbers. With the extensive deployment of airport X-ray security inspection machines, high-contrast materials can be effectively investigated, and X-ray CT technology has a high detection accuracy, so it plays an increasingly important role in the field of safety inspection.

In the United States, most important airports are already equipped with CT security devices. The European Union has explicitly requested that CT equipment be used in all new airported baggage safety equipment after 2012. In 2018, all airport checked baggage safety equipment must use CT technology.

In fact, the airport security inspection also includes many other technologies, such as checking for suspected dangerous liquids and solid powders. The above just introduces some common airport security inspection techniques. Between the special characteristics of air transportation, airport security is much stricter than other ordinary transportation. Airport security is very important. Every rigorous process is to ensure the safety of every passenger.