The tuning fork will only cause * * * vibration if the oscillation frequency is the same. Acousto-magnetic system (Acousto-magnetic) realizes almost zero false alarm operation by applying this physical principle. When the acousto-magnetic system tag fixed on the commodity enters the detection area of the system, it will generate * * * vibration, but the system will give an alarm only when the receiver receives the * * * vibration signal for four consecutive times (once every 1/50 seconds). Acousto-magnetic system is characterized by high anti-theft detection rate, almost zero false alarm, no metal foil shielding, good anti-interference and wide protection exit (the maximum width of a single system can reach 4 meters). Acousto-magnetic system has two kinds of anti-theft labels, soft and hard, which protect most kinds of goods in shopping malls. The soft label is small in size and can be degaussed repeatedly, so it is the first choice for anti-theft source label scheme. Acousto-magnetic system includes vertical system, channel system and concealed system. There are many models of 10 to choose from, which can be widely used in department stores, supermarkets, specialty stores, video stores, grocery stores, pharmacies and office buildings. Acousto-magnetic system is the latest anti-theft technology product with a history of only 10 years.
2 radio type
Radio frequency (RF) system has a history of more than 30 years, and it is one of the early electronic anti-theft systems. It uses radio frequency as the system to transmit and receive detection signals, and the detection frequency range is generally 7.x~8.x MHz. The detection rate of RF system is generally around 80%. Because its anti-theft tag is annular coil, many coil items or electronic products with similar frequency to the tag will trigger the system, causing the system to give false alarm. Moreover, the RF system is completely shielded by metal foil paper, and the anti-theft tag will fail when it is close to or stuck on the metal foil paper, resulting in missed detection of the system. The biggest advantage of RF system is that the system cost is very low. Radio frequency system has two kinds of labels, soft and hard, which can protect most items in shopping malls. Generally, the distance between two brackets should not be greater than1.2m. RF systems can be installed vertically and in tunnels to protect department stores, clothing appliances, supermarkets, etc. It has many brands of products to choose from, and the cost is low.
3 electromagnetic wave type
Electromagnetic system (EMS), which uses electromagnetic waves as detection signals, came out at about the same time as radio system, and has a history of more than 30 years. The detection rate of electromagnetic wave system is generally around 60%. The system is easily influenced by magnetic or metallic substances, resulting in false positive or false negative. Its advantages are minimal label, low price, repeated degaussing, and suitability for the protection of specific products such as books. There are two kinds of electromagnetic wave systems: vertical and channel, and the exit width is generally 0.8 meters. The application environment is mostly in libraries, bookstores, video stores and so on.
Microwave system
Microwave system uses microwave as detection signal, which is not easily disturbed by the surrounding environment. It can be installed flexibly and concealed (for example, hidden under the carpet or hung on the ceiling), and has the advantages of being suitable for decoration and beauty in the store. However, due to the large sensing range, it is impossible to arrange goods in a certain area, which will limit the use space of businesses with land and money, so it is suitable for large department stores, music stores and fashion stores with large storefronts.
Five-frequency division type
Frequency division system is an anti-theft system using high-tech frequency division technology and ultra-low frequency radio signals. When the anti-theft tag enters the detection area, the tag receives the signal from the transmitter, divides it into two halves, and then sends the information divided into two halves to the receiver. Only when the receiver receives half of the signal will it give an alarm, which can effectively avoid the interference of other radio waves. The system has the advantages of light label, small size, low price, stable performance, high detection rate, good anti-interference, and not easy to cause false alarms. There are two kinds: vertical and hidden. It is an ideal anti-theft system for clothing stores.
6 intelligence
Intelligent system uses unique technology, which is controlled by integrated circuit, driven by battery, and integrated with hard tag and alarm group. When the label is pried or taken out of the mall with the goods, the system will automatically alarm. The system can protect the goods in the whole shopping mall, and the labels can be reused without damaging the goods. Used to protect valuables. Such as fashion, leather, fur and so on.