Qu'est-ce que la RFID?
Je suis dans l'industrie RFID depuis près de dix ans, et c'est probablement la question qu'on me pose le plus.
L'explication de la RFID sur Internet est facile à trouver, mais c'est souvent inintéressant après l'avoir lu, ou c'est un tas de termes et d'explications.
En réalité, RFID is not only very common in our lives, but also a very interesting technology. Let’s ignore what RFID means for now.
En réalité, as long as we use an example, we can understand him quite comprehensively.
qu'est-ce qu'une carte RFID
Traffic card
We have all used the transportation card, it is a kind of RFID card. En réalité, if you think about it carefully, the bus card is really a magical little thing.
Première, he has no battery. A thin card, but it can be recharged and automatically deducted.
Deuxième, it is very versatile. Almost any card reader on a bus or subway platform can read and write.
Troisième, his encryption must be very good. Autrement, a powerful hacker can charge unlimited money to his bus card? We hardly hear such news, do we?
Quatrième, he is not too expensive. If we return the card, we can get twenty dollars. Because the deposit for the Shanghai Metro Card is 20 yuan. It can be seen that his cost must be less than twenty dollars.
Fifth: Il sait lire et écrire sans toucher. Parfois, vous mettez la carte dans votre sac ou votre portefeuille, et vous pouvez glisser la carte en douceur.
Sixième: les informations peuvent être stockées. Le lecteur de carte du bus n'est évidemment pas connecté à Internet, mais cela n'affecte pas le fait qu'il peut facilement déduire l'argent de notre carte. On peut voir que, au moins, les informations telles que le montant d'argent sur la carte sont bien sur la carte.
Septième: Unicité. Il y a un numéro de série sur la carte de bus, C'est, le numéro de carte, and all cards have their own identity.
When I was a kid, I used to wonder, why is this card so amazing, and what technology did he use?
I didn’t know until I entered the RFID industry that this is RFID technology.
RFID card and reader
RFID Functions
The bus card is a good interpretation of several main functions of RFID.
Première: Passivity. Reading and modification of information can be done even without the need for batteries.
Deuxième: generality. Different card machines and different cards can be easily read and written as long as a set of rules (or protocols) are formulated.
Troisième: encryption. His encryption level can be very high, as high as the level of a bank card.
Quatrième: economy. RFID tags can be very cheap.
Fifth: non-contact. He does not have to be in contact to read and write like a magnetic stripe card, and can read and write from a distance.
Sixième: storage function. Stores information
Septième: Unicité. Thousands of cards, all with their own identity, are unique.
After learning about these magical and interesting functions of RFID, are you interested in having a further understanding of it?
Next I try to explain as much as possible so that everyone can understand.
RFID card inlay
Dismantling Text
The RFID dismantling text is actually composed of the abbreviations of three English words.
R is for radio, and everyone knows it means radio. Another meaning of his is “les ondes radio”. En réalité, radio is radio waves, and then the meaning of radio is derived.
F is frequency, la fréquence. Radio waves have frequencies, and how many megazz the radio frequency we are familiar with refers to the frequency band of the radio.
Radio frequency is connected together and can be translated into “radio frequency” which is the frequency of radio waves.
ID is identification. Our ID card is called ID card.
Technologie RFID, C'est, Radio frequency identification technology. Linked together is “identification technology through the frequency of radio waves” referred to as “radio frequency identification technology”.
So how does RFID technology realize encryption without batteries, and realize long-distance reading and writing?
Comment fonctionne RFID
En réalité, RFID essentially uses a principle of physics: C'est, radio waves and electrical energy can be converted into each other.
Take bus cards for example. You get on a bus, and the card reader on the bus is both a “transmitter” and a “receiver”. The credit card machines on the buses that are connected to the power supply are emitting radio waves all the time.
Our bus card actually has several layers of synthesis. If you take a bus card and take it apart with scissors, vous pouvez voir que sa couche intermédiaire est composée de plusieurs parties. Tout d'abord, vous pouvez voir une bobine carrée, sur un coin de la bobine carrée, il y a un petit carré de la taille d'un grain de riz. Ce bloc est en fait un microprocesseur, et il a également une mémoire intégrée, qui est un module semi-conducteur. Lorsque la carte de bus se rapproche du lecteur de carte, le signal qu'il reçoit devient de plus en plus fort; et lorsque le signal de télécommunication sans fil atteint un certain seuil, le semi-conducteur conduit l'électricité. The Cary’s coil (antenna) picks up enough radio energy to convert it into electricity, which instantly activates the circuit. With electricity, Cary’s tiny chips come into play. le “miniature brain” (ébrécher) of the bus card understands the information sent by the card machine, such as deduction of two yuan. Then he will look up a balance in his card, oh, and ten dollars, that’s enough. That’s ok, agree to deduct two yuan, the bus card will convert the electric energy into radio waves again, and send a signal to the card machine to inform the card machine that the balance is sufficient and agree to deduct the fee. After the card machine receives the signal, it sends a message again to confirm that the deduction of 2 yuan has been implemented, and the chip has been received. Please confirm that 2 yuan has been deducted. En ce moment, the card machine made a beep and deducted “2 yuan”. De cette façon, 2 yuan is deducted from the bus card, et 2 yuan is added to the card machine. There are a lot of links, but in fact all the above processes are completed in less than a second.
Identity
An ID card is to give a person an identity. Through the ID number, everyone’s identity can be distinguished. The transportation card is to give the card an identity. Through the serial number of the card, the identity of each card can also be distinguished. ensuite, if a label is attached to the item, the identity of each item will be distinguished by the serial number of the label. This is the Internet of Everything.
With the update of technology.
Labels are getting smaller and can now be a few millimeters in size. Prices are getting cheaper and labels are now available for a few cents.
The reading and writing distance is getting farther and farther. Maintenant, the label of a few cents can be read from 7 mètres.
The Internet of Things
Hé bien, when most of the things around us are connected to the Internet of Things, we have entered an era of Internet of Things; all things we can know his origin, his shelf life, when they need to be replaced, and where they are now. Par exemple, when all the items in your refrigerator are tagged with RFID, the era of smart refrigerators will really come. You can check what’s in the fridge with just one click from your phone. And their production date and shelf life, which items are to be reminded for replenishment, and which items need to be eaten as soon as possible. All this information can be seen at a glance through the display on your phone or refrigerator. Is it smarter and more practical than the current smart refrigerator?
Applications in other fields
En réalité, RFID is widely used in many other fields besides payment. Par exemple, in the field of warehousing and logistics, Walmart replaced all of their warehouse management barcode labels with RFID tags many years ago. This move has enabled them to increase the efficiency of the inventory point by more than ten times in a very short period of time, while saving two-thirds of the labor.
RFID has been more and more integrated into our life now, we have reason to believe that with the development of technology, it will usher in an infinitely broad future.
Mot-clé: RFIDHY Entreposage Balise NFC Solutions RFID
Écrit par Li Shijun Shanghai RFIDHY
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