What is the instrument for security check called

It's called a security screening machine.

Security machines not only identify the shape of an object, but also show the color, which is different for various materials. Things like organic materials, such as paper, clothing, and various foods, usually show an orange color. While mixed materials and light metals, such as those containing sodium, silicon, and aluminum materials are usually displayed in green. Iron, copper, and silver are shown in black and blue. All these colors, the degree of lightness or darkness depends on the density and thickness of the material.

Nowadays, security equipment is like a see-through mirror, as long as you pass through it you can see anything on your body clearly. Therefore, many people are more worried, so sophisticated security equipment will not be all the secrets of the body can be seen, which involves privacy issues.

Generally speaking, all transportation places are equipped with security check, but the security equipment in the bus station is not so strict, just to detect the gift, not the need to test the passengers.

Other transportation venues may be more stringent, such as airports, high-speed rail and other places of security equipment precision is very high, in addition to the luggage we need to check also need to be passengers through the security check. The degree of baggage security check should be like a large lens, all the items inside can be seen. When passengers go through the security check they are also tested for what they have on them.

There are many advantages of the terahertz body scanner over previous security devices, such as the aforementioned elimination of the need for embarrassing body searches. There is also the fact that it does not emit radiation, but only receives radiation from the human body, which eliminates the security concerns of passengers; then there is the fact that it is very reliable, not only can it detect metal substances, but also non-metallic hazardous substances such as ceramic knives, drug powders, liquid explosives, colloidal bombs, etc.; and last but not least, it is very efficient, and it can detect up to 500 people per hour, which is about 5 times more than that of the traditional manual detection.

There are so many advantages, what are the disadvantages? It's so transparent that looking at the human body is like looking at a naked body with its clothes off. This is difficult for many people to accept, however, it is not insurmountable, first of all, passengers can be informed: sitting in front of the computer and "closed" in the small house of the security guards can not see the passenger himself.

The screeners will not tilt their heads to take a look at themselves and compare the images in the computer, which is not allowed in order to protect the privacy of the passengers.

Finally, if a passenger doesn't want to go through this kind of screening, they can voluntarily choose to undergo a "frisking" type of screening.