When an RFID tag passes through the electromagnetic zone, it detects the reader’s activation signal. The reader emits radio waves in ranges of anywhere from one inch to 100 feet or more, depending upon its power output and the radio frequency used. interrogator), which can be configured either as a handheld or a fixed-mount device. Often the antenna is packaged with the transceiver and decoder to become a reader (a.k.a. If constant interrogation is not required, a sensor device can activate the field. The electromagnetic field produced by an antenna can be constantly present when multiple tags are expected continually. Antennas are available in a variety of shapes and sizes they can be built into a door frame to receive tag data from persons or things passing through the door, or mounted on an interstate tollbooth to monitor traffic passing by on a freeway. Antennas are the conduits between the tag and the transceiver, which controls the system’s data acquisition and communication. The antenna emits radio signals to activate the tag and read and write data to it. Product Tracking and Inventory Control: RFID systems are commonly used to track and record the movement of ordinary items such as library books, clothes, factory pallets, electrical goods and numerous items. Payments are then routinely deducted from a users account, or information is changed directly on the RFID tag.
RFIDs are particular suited to electronic Toll collection systems.Tags attached to vehicles, or carried by people transmit payment information to a fixed reader attached to a Toll station. You will be generally familiar with RFID systems as seen in:Īccess Control: RFID Readers placed at entrances that require a person to pass their proximity card (RF tag) to be “read’ before the access can be made.Ĭontact less Payment Systems:RFID tags used to carry payment information. Generally a RFID system consists of 2 parts. A Reader, and one or more Transponders, also known as Tags. RFID systems evolved from barcode labels as a means to automatically identify and track products and people.
RFID is short for Radio Frequency Identification.
0 kommentar(er)
