Magnetic field measurement RFID system and magnetic field measurement method thereof
A technology of RFID tags and magnetic fields, applied in the field of RFID, can solve problems such as increasing equipment costs, and achieve the effect of solving power supply problems and low cost
Inactive Publication Date: 2013-12-18
BEIJING WUZI UNIVERSITY
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Problems solved by technology
Generally these devices require a continuous energy source for the sensing device to detect changes in the magnetic field, but this increases the cost of the device
In addition, some
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[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0028] like figure 1 As shown, it is a schematic structural diagram of an RFID system for measuring magnetic field according to an embodiment of the present invention. The RFID system for measuring magnetic field includes: an RFID reader 1, a first RFID tag 2 and a second RFID tag 3, and the first RFID tag 2 and the second RFID tag 3 have the same chip and antenna; after the first RFID tag 2 is placed under a certain magnetic field strength for a period of tim...
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The invention provides a magnetic field measurement RFID system and a magnetic field measurement method of the magnetic field measurement RFID system. The magnetic field measurement RFID system comprises an RFID reader, a first RFID label and a second RFID label, wherein the first RFID label and the second RFID label are provided with same chips and antennas. The first RFID label works under a first resonant frequency after being placed under a certain magnetic field intensity for a period of time, the second RFID label is an RFID label with a magnetic sensing device, the magnetic sensing device and the antenna of the second RFID label form a parallel connection structure, at the moment, the second RFID label works under a second resonant frequency after being placed under a certain magnetic field intensity for a period of time, the first RFID label and the second RFID label receive instructions sent by the RFID reader respectively and feed back signals, and the RFID reader detects the changes of a magnetic field by comparing the difference between the intensities of the signals which come from the first RFID label and the second RFID label respectively and have different frequencies. According to the magnetic field measurement RFID system and the magnetic field measurement method of the magnetic field measurement RFID system, the changes of the magnetic field can be detected at low cost.
Description
technical field [0001] The invention relates to the technical field of RFID (Radio Frequency Identification, radio frequency identification), in particular to an RFID system for measuring a magnetic field and a method for measuring a magnetic field. Background technique [0002] In recent years, RFID systems have become increasingly common. RFID systems are mainly used for the identification of people and objects. Generally speaking, the system includes at least one RFID reader, which can transmit and receive radio frequency signals from one or more RFID tags within a set range. This RFID tag is generally packaged and can be attached to an object. It includes a chip that can communicate with the antenna. This chip is a microchip, which is generally an integrated circuit, which can be used for storage and processing. information, modulates and demodulates radio frequency signals, and can perform other special functions. An RFID tag's antenna is used to receive and transmit...
Claims
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Login to View More IPC IPC(8): G01R33/09G06K17/00
Inventor 刘丙午霍灵瑜王玉泉
Owner BEIJING WUZI UNIVERSITY