What can people screening see?

What can people screening see?

When we travel in public places, we will pass through people screening. Everyone knows that people screening is to detect dangers, such as metal objects. When the human body carries illegal metal objects through the people screening, the police will be called. So you may wonder what can people screening detect and how it detect. Why some people screenings will not make alarm when you bring with keys, watches, or phones?

l What can people screening see?

l How people screening can detect?

l What factors will affect the accuracy of people screening?

What can people screening see?

We all know that public places, especially subways, stations, airports, and courts, must pass through people screening for inspection. So what items can the people screening detect?

Theoretically speaking, it is not allowed to carry except for luggage and clothing. The latest regulations on passengers are strictly prohibited from carrying:

l Explosive items: fireworks, explosives.

l Corrosive materials: waste batteries, sulfuric acid, sulfur.

l Toxic substances: pesticides, drugs, pesticides.

l Combustible gas: hair spray, pesticides, all compressed gas cylinders and plastic bottles.

l Flammable and explosive liquids: gasoline, paint, milk, alcohol.

l Radioactive materials: shafts, rings, lithium batteries.

l Control knives: daggers, bayonets, fruit knives, nail clippers, scissors.

So the above that people screening can detect are prohibited to carry, and some are prohibited items. Once the prohibited items are discovered, not only are you confiscated, you will also face the dilemma of fines or detention.

Some prohibited items that people screening can also detect include all explosives such as guns, ammunition, fireworks, detonators. The above listed are not allowed to appear in public transportation, as well as all corrosive acidic toxic gas liquids.

How people screening detect?

Before answer how people screening detect, we should first know the structure of people screening.

The outside of the people screening is composed of two door panels and a host. The inside of the door panel is composed of a large coil, 6 small coils, compensation coils and graphite.

The main components of the people screening involve a motherboard, a main chip, and a wire to connect to the door. Some wires that need to be connected to the gate will also reserve a line to connect to the gate.

All people screenings are produced by crystal oscillator with sine oscillation between 3.5 and 4.9M. The frequency divider is about 7.8K sine wave. After the power is amplified by the transistor and the coil, it is input into the door panel of people screening, and then the electromagnetic wave is emitted by the large coil. Inner copper coil receives, and then compares the received signal with the reference signal. After the change is found, the output level of the capture card is changed. The CPU scans the capture card in 18 locations within 300 milliseconds to detect and determine the location of the metal object.

To sum up, the reason why the people screening can detect the metal objects of the body is entirely because the metal objects change the normal electromagnetic wave emission trajectory of the people screening.

What factors will affect the accuracy of people screening?

The shell of the people screening: The frame material of people screening is an important link that affects quality and safety. Since the signal generated by the electromagnetic field in a safe environment passes the test, the amount of metal is very small. Therefore, the signal processing is usually amplified thousands of times to meet the requirements of the drive circuit. The design of the people screening is independent. The door panel of people screening with the sensor is slender and long, with a thickness of only 5 or 6cm and a length of 220cm. Due to the installation environment and long-term working relationship, the door panel of people screening is easy to deform so that the sensor parameters are too different from the factory parameters, which will affect the detection effect and cannot work for a long time.

The stability test of the people screening: The stability of the people screening is very important, which is the condition for customers to choose and purchase people screening. Unstable people screening can cause chaotic alarms and leak alarms, which cannot play a real role.

The detection ability of people screening for metal objects: Choose the same metal sample to detect the people screening that the smaller is the better. The traditional people screening should be able to detect all metals in accordance with the sensitivity standard of the national standard. Metal signal detection capability is a sign of the technical strength of metal detector manufacturers.

Learn more something about people screening can know what can people screening see and the factors to affecting people screening. If you want to buy good people screening with reasonable price, Shanghai Eastimage Equipment CO., LTD. is your best choice. Whether from quality or price, or delivery time, we can help customers to open up a further and larger market. We have all types of different people screening and if you have any questions, you can contact us or search us online.