Radio frequence designation engineering ( RFID, Radio Frequency Identification ) is a non-contact automatic designation engineering, the basic rule is the usage of the wireless frequence signal transmittal features, automatic designation of objects to be identified. Attached electronic tickets to place objects by surface or internal storage of information of the object, when the electronic ticket reader into a modest country, the reader with no manner of reaching the electronic ticket information harmonizing to certain regulations within the transmittal to the dorsum of computing machine treating systems or electronic control systems, enabling automatic acknowledgment map automatically cod points or points of designation information.
The basic constituents of the RFID:
Tags: the yoke constituents and french friess, each ticket has a alone electronic codification, attached to the object to place the mark object. Reader: read ( sometimes besides written ) device tag information can be designed for handheld rfid reader ( eg: C5000W ) or fixed reader. Antenna: RF signals transmitted between ticket and reader.
Working rule of the RFID
The basic working rule of RFID engineering: the label into the magnetic field, wireless frequence signal emitted by the reader receives, by virtuousness of the energy induced current obtained information sent out ( Passive Tag, inactive tickets or inactive tickets ) are stored in the bit, either by signal ( Active Tag, active tickets or active tickets ) initiative to direct a frequence reader to read and decrypt the information sent to the cardinal information system about informations processing.
Categorization of the RFID
RFID is divided into different application frequences LF, HF, UHF, microwave, representation matching frequences were: LF 135KHz or less, high frequence 13.56MHz, UHF 860M ~ 960MHz, microwave 2.4G, 5.8G. RFID harmonizing to the manner energy is supplied into inactive RFID, active RFID, and semi-active RFID. Passive RFID reader from the past, low monetary values ; active RFID reader can supply farther distance, but requires battery power, the cost is higher, suited for long distance applications to read and compose.
Depending on the RFID system to finish the map, the RFID system can be divided into four types: EAS systems, portable information acquisition systems, logistics control systems and positioning systems. 1. EAS system: EAS ( Electronic Article Surveillance ) is a demand to command the points set out in forepart of the RFID engineering. Typical applications of this engineering are stores, libraries and information centres and other topographic points, when an unauthorised individual objects illicitly removed from these topographic points, EAS system will publish a warning. A typical EAS system by and large consists of three parts: ? the merchandise attached to the electronic ticket, an electronic detector. ? electronic tickets inactivated device so that normal entree to licensed ware. ? proctor a monitoring infinite is formed in the mercantile establishment part.
2. Portable Data Acquisition System Portable informations acquisition system is the usage of handheld informations aggregator with RFID reader to roll up informations on the RFID ticket. This system has a comparatively big grade of flexibleness for fixed RFID systems should non be installed application environment. Real-time transmittal of informations to the host computing machine system. Handheld reader ( informations input terminal ) can read informations at the same clip, informations transmittal via wireless moving ridges, can be temporarily in the reader, in batches to the host computing machine informations storage informations transmittal system.
3. Logisticss control system Logistics control system, RFID readers scattered agreement in a given country, and the reader is connected straight to the information direction information system, the signal sender is traveling, normally installed in traveling objects, people above. When an object, when people go throughing through the reader, the reader automatically scans the information on the label and the informations input informations direction information system for storage, analysis and processing, in order to accomplish control of logistics.
4. Positioning system Positioning system for automated processing system positioning, every bit good as vehicles, ships and other run-positioning support. Reader placed on a traveling vehicle, boat or automated assembly line traveling stuffs, semi-finished and finished merchandises, the signal sender embedded in the operating environment below the surface. The place signal sender designation information is stored, the reader by and large by radio ( some usage in a wired mode ) to the chief information direction system.
RFID engineering was born during World War II, the first to be used to place their ain RAF and Allied combatants. In order to place the return British aircraft in the aircraft is equipped with a Allied wireless transceiver, and so when canvassing the control tower to return the aircraft transmits an question signal, the transceiver on the aircraft after this signal is received, return a signal to the inquisitor, harmonizing to the standard question return signals to place the enemy. This is the first record of an RFID IFF system, is the first practical application of RFID for the first clip.
RFID wireless frequence designation engineering has bit by bit developed into an independent interdisciplinary country of ??expertise. RFID wireless frequence designation engineering will be a batch of engineering ( for illustration, high-frequency engineering, electromagnetic compatibility engineering, semiconducting material engineering, informations protection and cryptanalysis engineering, telecommunications engineering, fabricating engineering, etc. ) from wholly different countries of expertness together. Over the past decennary, RFID wireless frequence designation engineering has been rapid development, bit by bit being widely used in many countries of traceability and anti-counterfeiting applications in industrial mechanization, concern mechanization, transit control direction. With progresss in engineering, based on wireless frequence designation RFID engineering will go progressively diverse scope of merchandises, applications will besides be more widely used, can be expected in the following few old ages, RFID wireless frequence designation engineering will go on to keep the impulse of rapid development. Overall, RFID wireless frequence designation engineering development tends to standardise the current, low-priced, low mistake rate, high security and low power ingestion.