I believe that many people who open supermarkets are more concerned about what kind of supermarket security doors to use. Because there are so many kinds of brands on the market, consumers are very troubled when they choose. I don’t know how to buy them. What are the types and advantages of supermarket security doors? Share some common sense today. Next, let Xiaobian take everyone to come and understand the relevant content of the supermarket security door .
First, the type of supermarket security door
1. Principle of radio system: The radio system uses radio waves as the signal for transmitting and receiving, and the detection frequency ranges from 7.x to 8.x megahertz. Radio signals of different frequencies are transmitted. The biggest advantage of the radio system is that the system cost is very low and the installation is very convenient. This is the first principle of the supermarket security door.
2. Principle of electromagnetic wave: The electromagnetic wave system uses electromagnetic waves as the detection signal. He has the smallest label, the label price is also cheap, and can be degaussed repeatedly. For example, the university library uses it, but the system is susceptible to false positives caused by magnetic or metallic substances. This is the second principle of the supermarket security door.
3. Acoustic and magnetic principle: The tuning fork only causes resonance when the oscillation frequency is the same. The principle of acousto-magnetic is the application of this physical principle to achieve almost zero false alarm operation. When the acoustic magnetic system tag fixed on the commodity enters the detection area of ​​the system, the two will resonate, but only received at the receiver. The alarm is issued after four consecutive resonance signals. The characteristics of the acoustic magnetic system are high anti-theft detection rate, almost zero false alarm, good anti-interference, and the protection exit width can reach 3.5 meters. This is the third principle of the supermarket security door.
Second, the advantages of supermarket security doors
1. Attach an electronic anti-theft tag to a product that is small in size and large in value, generally easy to be stolen. There is a security door for inspection at the exit of the mall. When the thief steals the tagged item and passes the inspection door. , it will immediately alarm (like the check-in at the airport entrance), and normal shopping will invalidate the label when passing the checkout counter, it will not alarm. For the supermarkets, clothing stores and specialty stores that often lose goods, you can Significantly reduce losses, but also save manpower and material resources.
Third, the supermarket security door identification method
1. Effective detection rate of supermarket security door: The effective detection rate of the supermarket security door can be called the blind area, which can also be called the false negative rate. Whether it is a supermarket or a shopping mall, there will be certain blind spots because of the environmental impact. A blind spot refers to an area where an anti-theft antenna cannot give an alarm when a valid tag enters the monitoring area.
2. The environment and installation distance can affect the blind zone. In an ideal environment, the suitable installation distance is 90cm, and the detection label is usually a domestic 4*4 soft label. After the installation is completed, it needs to be tested repeatedly. If the false negative rate is too high, you need to adjust the installation distance or the surrounding environment.
3. Supermarket security door false positive rate: The false positive rate is the primary performance indicator for measuring the entire supermarket security system. False positives are unavoidable. There are many reasons for false positives in actual operations. Some of them are impossible to check and are not regular.
4. The reason for the second false positives depends on the performance of the machine itself. The traditional analog signal processing method has relatively low anti-interference ability, which is easy to cause false positives. It is better to use the single chip to process the signal. In addition to the signals of similar tags, there is basically no false alarm; and the machine using the DSP digital signal processing system has a lower false positive rate.
I believe that after reading these contents, each reader has already got a new understanding of the supermarket security door. I hope everyone can get help after reading. Xiaobian is very grateful to everyone for reading. Yours Reading gives us the greatest support and motivation. If you want to know more, please continue to pay attention to the decoration home network.
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