As terrorist attacks become more frequent, security screening has become an important part of a country ’s security. High-tech testing equipment is essential. Fang Ji Unlimited shares with you how the security machine can distinguish contraband from color:

　　When passing through public places such as airports and train stations, our luggage will be inspected by security screening machines. When different baggage passes through the security machine, many different colors will be displayed on the screen of the security machine. What exactly do these colors represent?

    In order to ensure the public safety of planes, high-speed trains, trains and other places, everyone's luggage must pass through security screening machines. In order to prevent the sharp metal tools or other illegal objects carried in it from jeopardizing public safety, luggage is transported to the "enclosed space" of the security machine through the conveyor belt, and then the x-ray is triggered. X-rays in contact with the luggage will be partially absorbed by the items in the luggage, and the remaining ray energy will bombard the energy detector installed in the aisle.

    X-ray safety equipment detector converts the remaining x-ray energy into signals, which are amplified and sent to the signal processing cabinet for further processing. After passing through the image processing system, various colors will be displayed on the screen of the security inspection machine according to the different degrees of absorption of x-rays by different substances.

   Generally speaking, organic substances such as food and plastics are orange. Inorganic substances such as books and ceramics are green. Most of the mixtures are green, such as stainless steel products. The metal is blue, and the stun gun and knife are of different shades of blue. Red indicates that the product is a heavy metal or has a strong resistance to x-ray penetration. In addition, there are more specific divisions for each color and the items represented by the different saturation of the color. Professionally trained security inspectors can tell whether the bag contains contraband by color on the screen.