The working principle of the security check machine. The security check machine uses a conveyor belt to transport the checked luggage items into a tracked channel. After the item enters the security checkpoint, the detection device sends relevant information to the control unit, which triggers the X-ray source to emit X-rays. After passing through the collimator, X-rays form a very narrow fan-shaped beam that penetrates the luggage items on the conveyor belt and lands on the detector. The detector converts the received X-rays into electrical signals, which are amplified and quantized. These weak current signals are then transmitted to the industrial control computer through a universal serial bus for further processing. After complex calculations and imaging processing, high-quality images are obtained.

What is prohibited item? Prohibited items, also known as the "three items", are flammable and explosive materials, corrosive materials, controlled knives, and firearms.

1. Flammable and explosive materials include gasoline, alcohol, firecrackers, explosives, butane gas, cosmetics, air fresheners, etc.

2. Corrosive substances include sulfuric acid, hydrochloric acid, hydrogen peroxide, strong oxidizing materials, etc.

3. Control knives and scissors, including spring knives, triangular knives, fruit knives, scissors, etc.

How to identify prohibited items by color:

The display screen shows a blue tone, indicating that it is a metallic material. For example, cutting tools, etc.

The display screen shows a green tone, indicating that it is an explosive. For example, firecrackers, firecrackers, etc.

The display screen shows an orange tone, indicating that it is a liquid item. For example, mineral water, lighters, and related organic compounds.