How does the security X-ray machine distinguish dangerous goods such as explosives, drugs, guns and knives?

Today, with the economic development becoming more and more developed, people's living standards are increasing, and the requirements for safety are becoming higher and higher. At the same time, due to external third world wars, terrorist extremists and other factors, domestic airports, railway stations, and mass gatherings The site is equipped with more and more high-end security equipment.

The performance of security inspection equipment has improved a lot compared to previous years. Security inspection X-ray machine is a must-have equipment for security inspection channel. How does this equipment distinguish dangerous goods such as explosives, drugs, guns and knives?

The security inspection machine is an electronic device that completes the inspection by sending the checked luggage into the X-ray inspection channel by means of a conveyor belt. The baggage enters the X-ray inspection channel and will block the package detection sensor. 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 item on the conveyor belt, the X-ray is absorbed by the inspected item, and finally bombards the semiconductor detector installed in the channel. The detector converts X-rays into signals. These weak signals are amplified and sent to the signal processing cabinet for further processing. These signals are displayed on the display after processing.

"No matter how many layers there are, the X-rays can penetrate, and the items in the bag are displayed layer by layer." Recognizing different colors to identify dangerous items, multi-energy colored organic substances are displayed as orange, inorganic substances are displayed as blue, and mixture Displayed in green, high energy / low energy two energy switching display, high energy display metal, etc., low energy display

Non-metallic, in the image display system, X-ray sensor L-shaped photodiode array detector (multi-energy optional), 12bit depth, high penetration display improves the brightness of dark areas in the image, making items hidden behind high absorption objects Clear display of low penetration force display improves the contrast of low absorption rate (easy to penetrate) objects, making it easier to penetrate objects; therefore, the X-ray security inspection machine is not a decoration, but it actually takes up the work of railway safety protection .

How does the security inspection machine check out these dangerous goods?

1. Image monitoring method

The image monitoring method directly discriminates items from the X-ray perspective image configuration, therefore, whether the object to be inspected is suspicious depends on the image on the monitor or display. Uncommon or unusual objects appearing on the display or monitor should be regarded as suspicious objects. Those items that cannot be accurately identified should also be regarded as suspicious items. Careful investigation is required, and images can be positioned and analyzed as needed.

2. Color analysis

The color analysis method is based on the material information of the dissimilarity to show the dissimilarity of the color under the x-ray image, and then to identify the type of the material. The various colors that appear on the monitor are a reflection of the density, quality, and quantity of the object. Therefore, the quality of the object can be evaluated according to the color depth of the image.

Light yellow, usually a color that appears in a single piece of clothing, thin plastic, and a small amount of paper.

Orange color is generally the color of soap, fan, explosives, drugs, wood, leather products and so on.

Deep orange, generally a large number of books, paper, RMB, high-concentration liquids, large bags of rice noodles, etc.

Blue is the color of inorganic substances such as copper, iron and zinc. Thick cables, electric shockers, bullets, rifle bullets, guns and knives, etc., appear to be very different.

blue. Green is the color of the mixture, and stainless steel products, cables, etc. appear inconsistently green. Red color is the color of impenetrable objects, mostly heavy metals and thick objects.

3. Restoration judgment

The items in the baggage have different views due to the different viewpoints placed, and the objects appear in a different shape under the X-ray image, and may even be deformed, so that the original face is changed. The method of reversing the baggage or changing the viewpoint of the baggage in the X-ray system channel can be used to help recover the shape.

4. AHP

When investigating images of overlapping objects, we can enter some of the overlapping objects from the non-overlapping edge of the object, and then analyze the colors and shapes of different layers to determine the original shape of the object.

5. Feature Discrimination

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. For example, facial cleanser and hair spray show the same color, but there is an activation button on the hair spray.