All the friends were shocked by stealing stainless steel barrels!
Stealing a stainless steel barrel at the mall can escape security check in the mall? Recently, a man in Hangzhou used this technique to steal 7 pieces of men’s and women’s clothing and a bottle of Wuliangye liquor, which caused heated discussions among netizens. The Guangzhou Daily reporter verified that the use of stainless steel barrels can indeed achieve the effect of shielding security checks. This is the knowledge that has been taught in the high school physics class: the principle of electromagnetic shielding.
Stealing into the mall with stainless steel buckets can avoid security checks, really!
On October 18, the Hangzhou police found a suspicious man walking to the supermarket with an oversized black travel bag while patrolling the city. The police found that there was a large white stainless steel barrel in the travel bag. In the barrel, 7 pieces of uncut men’s and women’s garments and an unopened bottle of Wuliangye liquor were found in the barrel.
After preliminary inspection by the police, these products were all stolen by the man in Xixi Impression City Uniqlo, ZARA store, and Sam’s Club. In order to facilitate the smooth passage of the stolen items through the supermarket’s security gate, the man chose a white stainless steel barrel to demagnetize. In order to cover up this special tool of crime, he had to choose an oversized travel bag to place it.
The man said that in May this year, he lost all his savings in gambling in Macau and owed more than 100,000 yuan to friends outside. In order to be able to take out the stolen items smoothly, he also specifically consulted his classmates who studied physics. Classmates told him that he could use stainless steel buckets to avoid the security check in the supermarket.
After the report was issued, it immediately sparked heated discussions among netizens, and was even ridiculed by netizens as “So great, why not apply for the Nobel Prize in Physics?”
Contrabands in tin foil can pass the airport security check, fake!
In addition to stainless steel barrels, wrapping with tin foil is the most common shielding method that appears in daily security inspection rumors, especially airport security. There is even a saying that tin foil can wrap guns.
So, can wrapping in tin foil really pass the airport security check? On the morning of October 15th, Baiyun Airport discovered such a unique case. A passenger carrying a metal lighter was found in an inspection at Guangzhou Baiyun Airport. Unlike usual, the passenger wrapped the lighter layer by layer with tin foil in an attempt to avoid the X-ray machine inspection, but he still could not escape the law. Looking at the lighter that was found out, the traveler said that he read the Internet saying that tin foil can avoid X-ray inspection and that the lighter was thickly wrapped with tin foil. Unexpectedly, this was still “seen” by the X-ray machine.
In this regard, an expert from a university in Guangzhou said that X-ray security inspection devices have a stronger penetrating effect than ordinary security inspections. Even if the tin foil is not penetrated, a large bright image will be displayed on the security inspection device after the package is wrapped. “Although you can’t see the contents inside, the security staff will definitely let you open the package for inspection. Now even the stainless steel cups are required to be opened during the security inspection, not to mention the unidentified metal that seems to be wrapped?” the expert said.
Verification: It can indeed shield the anti-theft door
Netizens said it was high school physics knowledge
Can such a weird method of theft really block the security check? Some netizens ridiculed that the thief’s move was a “Nobel Prize” theft, but some netizens who knew that this principle was the principle of electromagnetic shielding: “This is high school physics knowledge, discovered hundreds of years…”
In this regard, Jiang Jianbin, a physics teacher in the second grade of Tianhe School affiliated to Guangdong Experimental Middle School, said that there are currently three main principles for security inspection devices in supermarkets and other places: radio frequency principles, acoustic and magnetic principles, and electromagnetic waves.
Among them, the principle of radio frequency is to use radio waves as the signal to be transmitted and received. The anti-theft tag is a toroidal coil, which will be interfered with by metals. It is mostly used in clothing stores, department stores, supermarkets, etc., and the price is cheap; The physical principle is that resonance is caused only when the oscillation frequency is the same.
When the acousto-magnetic system tag fixed on the product enters the detection area of the system, it will resonate, but only when the receiver receives four consecutive resonance signals (every 1/ Once every 50 seconds), the alarm is issued. It is less interfered with by metals. It is mostly used in department stores, supermarkets, and specialty stores. The price is higher. The electromagnetic wave principle uses electromagnetic waves as the detection signal. The electromagnetic wave principle uses the smallest label, and the label price is cheap and can be repeatedly demagnetized. , But it is susceptible to interference from magnetism or metal materials and is mostly used in bookstores and libraries.
“Using a stainless steel bucket to load goods in and take out the security door is to bounce most of the electromagnetic waves emitted by the security door so that there is no way to receive the signal reflected from the security label, so there is no response, and the security door loses its function. This is similar to when we enter the elevator, the mobile phone has no signal, and the radiation interference can be avoided by wearing radiation protection suits.” Jiang Jianbin said.
So, in addition to stainless steel barrels, what else can shield the signal from the mall? An expert from a university in Guangzhou said: “As long as it is something that can block cell phone signals!” However, Jiang Jianbin reminded: “Skynet is restored without leaking. Don’t try to be greedy and do illegal things for a while.”