The performance of security inspection equipment has improved a lot compared to previous years. The security X-ray machine is a must-have equipment for the security inspection channel. How this equipment distinguishes explosives, drugs, guns, knives and other dangerous items starts with the principle of the security inspection machine.

The performance of security inspection equipment has improved a lot compared to previous years. The security X-ray machine is a must-have equipment for the security inspection channel. How this equipment distinguishes explosives, drugs, guns, knives and other dangerous items starts with the principle of the security inspection machine.

Today, as the economy develops more and more, people's living standards have improved and their requirements for security have become higher and higher. At the same time, due to external wars in the third world, terrorist extremists and other factors, domestic airports, railway stations, mass gatherings Venues are equipped with increasingly high-end security equipment.

The performance of security inspection equipment has improved a lot compared to previous years. The security X-ray machine is a must-have equipment for the security inspection channel. How this equipment distinguishes explosives, drugs, guns, knives and other dangerous items starts with the principle of the security inspection machine.

The security inspection machine is an electronic device that uses a conveyor belt to send the checked baggage into the X-ray inspection channel to complete the inspection. When baggage enters the X-ray inspection channel, it will block the package detection sensor, and the detection signal is sent to the system control part to generate an X-ray trigger signal, which triggers the X-ray source to emit an X-ray beam. X

The ray beam passes through the inspected items on the conveyor belt, and the X-rays are absorbed by the inspected items, and finally bombard the semiconductor detector installed in the channel. The detector converts X-rays into signals. These very weak signals are amplified and sent to the signal processing box for further processing. After processing, these signals are displayed on the display screen.

"No matter how many layers the bag has, X-rays can penetrate it and display the items in the bag layer by layer." Relying on different colors to identify dangerous items, multi-energy colored organic matter is shown in orange, inorganic matter is shown in blue, and mixtures Displayed in green, high energy/low energy switching display, high energy display metal, etc., low energy display

Non-metal, in the image display system, X-ray sensor L-shaped photodiode array detector (multi-energy optional), 12-bit depth, high-penetration display improves the brightness of dark areas in the image, making items hidden behind highly absorbent objects Clear display Low penetration display improves the contrast of low-absorption (easy-penetration) objects and makes easy-penetration objects clearer; therefore, the X-ray security inspection machine is not a decoration, but actually takes on the task of guarding railway safety. .

So how does the security inspection machine detect these dangerous items?

1. Image surveillance method

The image monitoring method directly identifies objects from the configuration of X-ray fluoroscopic images. Therefore, whether the inspected object is suspicious depends on the image on the monitor or display. Unusual or strange objects appearing on the display or monitor should be regarded as suspicious items. Those items that cannot be accurately identified should also be regarded as suspicious items and need to be carefully investigated, and the images can be located and analyzed as needed.

2. Color analysis

The color analysis method is based on the appearance of different colors in x-ray images by different material materials, and then the identification of material types is carried out. The various colors that appear on the monitor reflect the density, quality and quantity of objects. Therefore, the quality of objects can be evaluated based on the depth of the image color.

Light yellow is usually the color of a single piece of clothing, thin plastic, and a small amount of paper.

Orange is generally the color of soap, soap, explosives, drugs, wood, leather products, etc.

Dark orange color usually indicates a large number of books, papers, RMB, high-concentration liquids, large bags of rice and noodles, etc.

Blue is the color of inorganic substances such as copper, iron, and zinc. Thick cables, stun guns, bullets, grooved bullets, guns and knives, etc. appear in different shades.

Blue. Green is the color of mixtures, and stainless steel products, cables, etc. appear in different shades of green. Red is the color that appears on impenetrable objects, mostly heavy metals and thick objects.

3. Restoration Judgment

Due to the different placement angles of the items in the luggage, the objects will appear in different shapes under the X-ray image, and may even deform, even changing their original appearance. You can restore the original shape by re-inverting or changing the angle of the baggage in the X-ray system channel.

4. Analytic hierarchy process

Observe overlapping object images, you can enter the overlapping parts from the non-overlapping edges of the objects, and then determine the true shape of the object by analyzing the colors and shapes of different levels.

5. Feature discrimination method

Any object has its specific external shape. Security personnel should keep in mind the shape characteristics of various objects on the monitor and then determine what kind of objects they are. For example, facial cleanser and hairspray have the same color, but there is a start button on the hairspray.