CN202694398U - RFID (Radio Frequency Identification) tag and RFID system with flow and flow speed detection device - Google Patents
RFID (Radio Frequency Identification) tag and RFID system with flow and flow speed detection device Download PDFInfo
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- CN202694398U CN202694398U CN 201220259477 CN201220259477U CN202694398U CN 202694398 U CN202694398 U CN 202694398U CN 201220259477 CN201220259477 CN 201220259477 CN 201220259477 U CN201220259477 U CN 201220259477U CN 202694398 U CN202694398 U CN 202694398U
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Abstract
The utility model provides an RFID (Radio Frequency Identification) tag and an RFID system with a flow and flow speed detection device. A parallel structure is formed by the flow and flow speed detection device and an antenna of the RFID tag; a line for connecting the flow and flow speed detection device with a chip of the RFID tag is provided with a logic circuit for controlling switching-on/off and a voltage-resistance converting device; when the logic circuit is switched off, the flow and flow speed detection device is not parallel to the antenna and is placed under certain flow and flow speed; a first resonant frequency and a signal strength of the antenna keep the same; when the logic circuit is switched on, the flow and flow speed detection device is parallel to the antenna and is placed under the certain flow and flow speed; at least one of a characteristic frequency and a signal strength of the antenna is changed and the antenna works under a second resonant frequency; and the RFID tag receives an instruction sent by an RFID reader to control the switching-on/off of the logic circuit so as to realize the change of the flow and flow speed is detected by comparing the difference of signal strengths with different frequencies from the antenna. The change of the flow and flow speed can be detected by a lower cost.
Description
Technical field
The utility model relates to RFID (Radio Frequency Identification, radio-frequency (RF) identification) technical field, relates in particular to a kind of RFID label, rfid system with the flow velocity pick-up unit.
Background technology
In recent years, rfid system had become more prevalent.Rfid system is mainly used in the identification to people and thing.In general, this system comprises a RFID reader at least, and this RFID reader can transmit and receive the radiofrequency signal from one or more RFID labels in the scope of a setting.This RFID label generally is encapsulated, and can be attached on the object, and it comprises the microchip that an energy and antenna carry out information interchange.This microchip is an integrated circuit in general, and it can be used for storing and process information, the modulation /demodulation radiofrequency signal, and can move other specific function.The antenna of RFID label is to receive and the transmission radiofrequency signal, and usually is applicable to a kind of special frequency.
In some equipment, when the flow velocity that has been used to monitor product environment of living in the rfid system of flow velocity pick-up unit has surpassed the acceptable flow velocity.In general these equipment requirement induction installations will have a lasting energy source, are used for detecting the change of flow velocity, but this can increase the cost of equipment.In addition, some equipment requirement induction installations also will link to each other with a comparator circuit, thereby detect the degree size that departs from reference voltage, and this requirement has increased the cost of equipment greatly.In a word, improve rfid system and be necessary, it requires to be used for detecting flow velocity when not using lasting energy source or using a kind of cheaply adjunct circuit and changes.
The utility model content
The utility model embodiment provides a kind of RFID label, rfid system with the flow velocity pick-up unit, detects at lower cost flow velocity and changes.
On the one hand, the utility model embodiment provides a kind of RFID label with the flow velocity pick-up unit, and two pins are arranged on the chip of described RFID label; Two pins of described flow velocity pick-up unit and this link to each other, and form parallel-connection structure with the antenna of described RFID label, the variation of extraneous flow velocity can cause the variation of flow velocity pick-up unit both end voltage or electric current, the circuit that is connected with the chip of RFID label at described flow velocity pick-up unit has logical circuit and a voltage-resistance conversion equipment of controlling break-make, the circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip, voltage-resistance conversion equipment is used for the variation of flow velocity pick-up unit both end voltage or electric current is converted to the variation of resistance, the break-make of logical circuit determined the flow velocity pick-up unit whether with the sky line parallel: when logical circuit disconnects, the flow velocity pick-up unit not with the sky line parallel, be placed under certain flow velocity this moment, and the first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, the flow velocity pick-up unit was placed under certain flow velocity with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have at least one and change, and this moment, antenna was operated under the second resonant frequency; Described RFID label receives the instruction of RFID reader transmission with the break-make of control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna by comparison the change of flow velocity.
Optionally, in the utility model one embodiment, the antenna of described RFID label is monopole antenna.
Optionally, in the utility model one embodiment, the antenna of described RFID label is double-doublet antenna: described flow velocity pick-up unit and the voltage that links to each other with this flow velocity pick-up unit-resistance conversion equipment form parallel-connection structure with antenna wherein; Perhaps described flow velocity pick-up unit forms parallel-connection structure simultaneously with the voltage that links to each other with this flow velocity pick-up unit-resistance conversion equipment and two antennas.
Optionally, in the utility model one embodiment, described voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type field effect transistor or field effect transistor to, and described flow velocity pick-up unit comprises: vortex flow pick-up unit, turbine flow pick-up unit, electromagnetic flow pick-up unit, electromagnetic type flow monitor.
On the other hand, the utility model embodiment provides a kind of RFID label with the flow velocity pick-up unit, and a pin is arranged on the chip of described RFID label; One end of described flow velocity pick-up unit links to each other with this pin, the other end is connected on the antenna of described RFID label, and form parallel-connection structure with antenna, the variation of extraneous flow velocity can cause the variation of flow velocity pick-up unit both end voltage or electric current, the circuit that is connected with the chip of RFID label at described flow velocity pick-up unit has logical circuit and a voltage-resistance conversion equipment of controlling break-make, the circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip, voltage-resistance conversion equipment is used for the variation of flow velocity pick-up unit both end voltage or electric current is converted to the variation of resistance, the break-make of logical circuit determined the flow velocity pick-up unit whether with the sky line parallel: when logical circuit disconnects, the flow velocity pick-up unit not with the sky line parallel, be placed under certain flow velocity this moment, and the first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, the flow velocity pick-up unit was placed under certain flow velocity with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have at least one and change, and this moment, antenna was operated under the second resonant frequency; Described RFID label receives the instruction of RFID reader transmission with the break-make of control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna by comparison the change of flow velocity.
Optionally, in the utility model one embodiment, the antenna of described RFID label is monopole antenna.
Optionally, in the utility model one embodiment, the antenna of described RFID label is double-doublet antenna: described flow velocity pick-up unit and the voltage that links to each other with this flow velocity pick-up unit-resistance conversion equipment form parallel-connection structure with antenna wherein; Perhaps described flow velocity pick-up unit forms parallel-connection structure simultaneously with the voltage that links to each other with this flow velocity pick-up unit-resistance conversion equipment and two antennas.
Optionally, in the utility model one embodiment, described voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type field effect transistor or field effect transistor to, and described flow velocity pick-up unit comprises: vortex flow pick-up unit, turbine flow pick-up unit, electromagnetic flow pick-up unit, electromagnetic type flow monitor.
Another aspect, the utility model embodiment provides a kind of RFID label with the flow velocity pick-up unit, described flow velocity pick-up unit is connected on the antenna of described RFID label, and form parallel-connection structure with antenna, the variation of extraneous flow velocity can cause the variation of flow velocity pick-up unit both end voltage or electric current, the circuit that is connected with antenna at described flow velocity pick-up unit has logical circuit and a voltage-resistance conversion equipment of controlling break-make, the circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip, voltage-resistance conversion equipment is used for the variation of flow velocity pick-up unit both end voltage or electric current is converted to the variation of resistance, the break-make of logical circuit determined the flow velocity pick-up unit whether with the sky line parallel: when logical circuit disconnects, the flow velocity pick-up unit not with the sky line parallel, be placed under certain flow velocity this moment, and the first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, the flow velocity pick-up unit was placed under certain flow velocity with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have at least one and change, and this moment, antenna was operated under the second resonant frequency; Described RFID label receives the instruction of RFID reader transmission with the break-make of control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna by comparison the change of flow velocity.
Optionally, in the utility model one embodiment, the antenna of described RFID label is monopole antenna.
Optionally, in the utility model one embodiment, the antenna of described RFID label is double-doublet antenna: described flow velocity pick-up unit and the voltage that links to each other with this flow velocity pick-up unit-resistance conversion equipment form parallel-connection structure with antenna wherein; Perhaps described flow velocity pick-up unit forms parallel-connection structure simultaneously with the voltage that links to each other with this flow velocity pick-up unit-resistance conversion equipment and two antennas.
Optionally, in the utility model one embodiment, described voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type field effect transistor or field effect transistor to, and described flow velocity pick-up unit comprises: vortex flow pick-up unit, turbine flow pick-up unit, electromagnetic flow pick-up unit, electromagnetic type flow monitor.
On the one hand, the utility model embodiment provides a kind of rfid system with the flow velocity pick-up unit again, and described rfid system comprises RFID label and RFID reader, and described RFID label comprises above-mentioned RFID label with the flow velocity pick-up unit; Described RFID reader sends instruction with the break-make of the logical circuit of control RFID label, thereby detects the change of flow velocity from the difference between the signal intensity of the different frequency of antenna by comparison.
Technique scheme has following beneficial effect: because the technological means that adopts can detect the technique effect that flow velocity changes at lower cost so reached, and the energy that utilizes RFID to obtain, solved the powerup issue that flow velocity detects.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the synoptic diagram that the utility model embodiment flow velocity pick-up unit is connected with the RFID label chip;
Fig. 2 is the equivalent circuit diagram of RFID label chip inside antenna;
Fig. 3 is the synoptic diagram that the utility model embodiment flow velocity pick-up unit, logic switch and voltage-resistance conversion equipment are connected with RFID label chip inside antenna equivalent electrical circuit;
Fig. 4 synoptic diagram that to be the utility model embodiment flow velocity pick-up unit directly be connected with the RFID label antenna;
Fig. 5 is the structure key diagram of the utility model embodiment flow velocity pick-up unit;
Fig. 6 is that the utility model embodiment is based on the process flow diagram of the flow velocity detection method of signal intensity.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
The flow velocity pick-up unit of the utility model embodiment links to each other with the chip of RFID label and has at least three kinds of situations:
The two pins structure:
The utility model is a kind of device, system and technology that flow velocity changes that be used for detecting.This system has comprised a label, and two pins are arranged on the chip of this label.Two pins of flow velocity pick-up unit and this link to each other, and form parallel-connection structure with antenna.The variation of extraneous flow velocity can cause the variation of flow velocity pick-up unit both end voltage or electric current.The circuit that is connected with chip at pin has logical circuit and a voltage-resistance conversion equipment of controlling break-make, and logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is the variation that the variation of flow velocity pick-up unit both end voltage or electric current is converted to resistance.The break-make of logical circuit determined the flow velocity pick-up unit whether with the sky line parallel.When logical circuit disconnects, the flow velocity pick-up unit not with the sky line parallel.This moment, the flow velocity pick-up unit was placed under certain flow velocity, and the first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit was connected, the flow velocity pick-up unit was placed under certain flow velocity with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have at least one and change, and this moment, antenna was operated under the second resonant frequency.Reader can send the break-make of instruction control logic circuit to label, when logical circuit is connected, can detect by comparison the change of flow velocity from the difference between the signal intensity of the different frequency of antenna.
With regard to an example, this system has comprised a label, only has an antenna (monopole antenna) on this label.Two pins are arranged on the chip of this label.Two pins of flow velocity pick-up unit and this link to each other, and form parallel-connection structure with antenna.The circuit that is connected with chip at pin has logical circuit and a voltage-resistance conversion equipment of controlling break-make, and logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is the variation that the variation of flow velocity pick-up unit both end voltage or electric current is converted to resistance.The flow velocity pick-up unit is placed under certain flow velocity when logical circuit is connected, and antenna features frequency and signal intensity have at least one and change, and it is operated under the second resonant frequency.Reader can send instruction to label, and the difference between the signal intensity of the different frequency during by the Compare Logic connecting and disconnecting of the circuit can detect the change of flow velocity.Or rather, voltage-resistance conversion equipment can be an equivalent electrical circuit that variable voltage is converted to variable-resistance device, ditch type field effect transistor or field effect transistor.And the instantiation of flow velocity pick-up unit comprises: vortex flow pick-up unit, turbine flow pick-up unit, electromagnetic flow pick-up unit, electromagnetic type flow monitor etc.
With regard to another example, this system has comprised a label, and two antennas (double-doublet antenna) are arranged on this label.Two kinds of situations are arranged this moment.The first situation is that two pins of flow velocity pick-up unit and this link to each other, and forms parallel-connection structure with first antenna.The circuit that is connected with chip at pin has logical circuit and a voltage-resistance conversion equipment of controlling break-make, and logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is the variation that the variation of flow velocity pick-up unit both end voltage or electric current is converted to resistance.The voltage-resistance conversion equipment that link to each other with the flow velocity pick-up unit this moment also with first sky line parallel, and second antenna is all the time with the first resonant frequency proper communication.When logical circuit is connected, be placed under certain flow velocity, first antenna features frequency and signal intensity have at least a meeting to change, and it is operated under the second resonant frequency.Reader can send instruction to label, and the difference between the signal intensity of the different frequency of first and second antennas can detect the change of flow velocity when connecting by the Compare Logic circuit.Difference between the signal intensity of the different frequency during logical circuit break-make by second antenna self relatively also can detect the change of flow velocity.The second situation is that two pins of flow velocity pick-up unit and this link to each other, and form simultaneously parallel-connection structure with two antennas.The circuit that is connected with chip at pin has logical circuit and a voltage-resistance conversion equipment of controlling break-make, and logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is the variation that the variation of flow velocity pick-up unit both end voltage or electric current is converted to resistance.The voltage that link to each other with the flow velocity pick-up unit this moment-resistance conversion equipment is also simultaneously in parallel with these two antennas, and the situation that this and label only contain an antenna is similar.Be placed under certain flow velocity when logical circuit is connected, antenna features frequency and signal intensity have at least one and change, and it is operated under the second resonant frequency.Reader can send instruction to label, and the difference between the signal intensity of the different frequency during by the Compare Logic connecting and disconnecting of the circuit can detect the change of flow velocity.The first situation circuit connects fairly simple, and the resonant frequency of two antennas may be different during work, can affect the precision of measurement.The second situation circuit connects more complicated, but the resonant frequency of two antennas is consistent during work, and measuring accuracy is higher.Or rather, voltage-resistance conversion equipment can be an equivalent electrical circuit that variable voltage is converted to variable-resistance device, ditch type field effect transistor or field effect transistor.And the instantiation of flow velocity pick-up unit comprises: vortex flow pick-up unit, turbine flow pick-up unit, electromagnetic flow pick-up unit, electromagnetic type flow monitor etc.
One pin configuration:
The chip of this label can only have a pin, and this pin outwards links to each other with an end of flow velocity pick-up unit, and the other end of flow velocity pick-up unit is directly linked on the antenna.Pin is similar in the situation of the tie point of chip internal and two pins, finally remains the purpose that will reach with the sky line parallel.The circuit that is connected with the chip internal circuit at pin simultaneously has the logical circuit of a control break-make.In addition, voltage-resistance conversion equipment in parallel again on the circuit of antenna, voltage-resistance conversion equipment have again circuit and flow velocity pick-up unit to be connected two-termial line with logical circuit to be connected.When logical circuit disconnects, the flow velocity pick-up unit not with the sky line parallel, this moment be placed under certain flow velocity, the first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit was connected, the flow velocity pick-up unit was placed under certain flow velocity with a day line parallel, this moment, and antenna features frequency and signal intensity have at least one and change, and it is operated under the second resonant frequency.Reader can send the break-make of instruction control logic circuit to label, when logical circuit is connected, can detect by comparison the change of flow velocity from the difference between the signal intensity of the different frequency of antenna.
With regard to an example, this system has comprised a label, only has an antenna (monopole antenna) on this label.The flow velocity pick-up unit links to each other with this pin, and the other end of flow velocity pick-up unit is directly linked on the antenna, forms parallel-connection structure with this root antenna.The circuit that is connected with chip at pin has logical circuit and a voltage-resistance conversion equipment of controlling break-make, and logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is the variation that the variation of flow velocity pick-up unit both end voltage or electric current is converted to resistance.Be placed under certain flow velocity when logical circuit is connected, antenna features frequency and signal intensity have at least one and change, and it is operated under the second resonant frequency.Reader can send instruction to label, and the difference between the signal intensity of the different frequency during by the Compare Logic connecting and disconnecting of the circuit can detect the change of flow velocity.Or rather, voltage-resistance conversion equipment can be an equivalent electrical circuit that variable voltage is converted to variable-resistance device, ditch type field effect transistor or field effect transistor.And the instantiation of flow velocity pick-up unit comprises: vortex flow pick-up unit, turbine flow pick-up unit, electromagnetic flow pick-up unit, electromagnetic type flow monitor etc.
With regard to another example, this system has comprised a label, and two antennas (double-doublet antenna) are arranged on this label.The flow velocity pick-up unit with this one by one pin link to each other, the other end of flow velocity pick-up unit is directly linked on the antenna, forms parallel-connection structure with first antenna.The circuit that is connected with chip at pin has logical circuit and a voltage-resistance conversion equipment of controlling break-make, and logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is the variation that the variation of flow velocity pick-up unit both end voltage or electric current is converted to resistance.The voltage-resistance conversion equipment that link to each other with the flow velocity pick-up unit this moment also with first sky line parallel, and second antenna is all the time with the first resonant frequency proper communication.When logical circuit is connected, be placed under certain flow velocity, first antenna is operated under the second resonant frequency, and its characteristic frequency and signal intensity have at least a meeting to change.Reader can send instruction to label, and when connecting by the Compare Logic circuit, the difference between the signal intensity of the different frequency of first and second antennas can detect the change of flow velocity.Difference between the signal intensity of the different frequency during logical circuit break-make by first antenna self relatively also can detect the change of flow velocity.Or rather, voltage-resistance conversion equipment can be an equivalent electrical circuit that variable voltage is converted to variable-resistance device, ditch type field effect transistor or field effect transistor.And the instantiation of flow velocity pick-up unit comprises: vortex flow pick-up unit, turbine flow pick-up unit, electromagnetic flow pick-up unit, electromagnetic type flow monitor etc.
Without pin configuration:
When not having pin on the chip of RFID label, the flow velocity pick-up unit can directly be linked on the antenna.Flow velocity pick-up unit and antenna form parallel-connection structure.The circuit that is connected with chip at antenna has logical circuit and a voltage-resistance conversion equipment of controlling break-make, and logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is the variation that the variation of flow velocity pick-up unit both end voltage or electric current is converted to resistance.In this case, the antenna that links to each other with the flow velocity pick-up unit can not break away from the flow velocity pick-up unit and communicate by letter with the first resonant frequency.When being placed under certain flow velocity, the second resonant frequency of antenna and signal intensity have at least one and change.Reader can send instruction to label apparatus, detects the change of flow velocity from the difference between the signal intensity of the different frequency of antenna by comparison.
With regard to an example, this system has comprised a label, and two antennas (double-doublet antenna) are arranged on this label.The flow velocity pick-up unit directly links to each other with first antenna.Flow velocity pick-up unit and antenna form parallel-connection structure.The circuit that is connected with chip at antenna has logical circuit and a voltage-resistance conversion equipment of controlling break-make, and logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is the variation that the variation of flow velocity pick-up unit both end voltage or electric current is converted to resistance.And second antenna do not link to each other with the flow velocity pick-up unit all the time with the first resonant frequency proper communication.When being placed under certain flow velocity, first antenna features frequency and signal intensity have at least a meeting to change, and it is operated under the second resonant frequency, and the characteristic frequency of second antenna and signal intensity are constant.Reader can send instruction to label, and can detect the change of flow velocity by the difference between the signal intensity of the different frequency of first and second antennas relatively.Or rather, voltage-resistance conversion equipment can be an equivalent electrical circuit that variable voltage is converted to variable-resistance device, ditch type field effect transistor or field effect transistor.And the instantiation of flow velocity pick-up unit comprises: vortex flow pick-up unit, turbine flow pick-up unit, electromagnetic flow pick-up unit, electromagnetic type flow monitor etc.
In the same way, can be with on the chip of antenna also and can not be with pin, can be with one also can be with a plurality of pins.The radical of antenna can be one, two or even many.Also can connect accordingly one or more flow velocity pick-up units, the model of flow velocity pick-up unit can be the same or different simultaneously.In addition, the voltage that is attached thereto-resistance conversion equipment also can have many variations.With regard to the device a kind of instantiation with regard to, when be placed on certain flow velocity under, the resonant frequency of the antenna that links to each other with the flow velocity pick-up unit and signal intensity have at least a meeting to change.Reader can send instruction to label apparatus, detects the change of flow velocity from the difference between the signal intensity of the different frequency of antenna by comparison.
With regard to a kind of instantiation of flow velocity pick-up unit, the method for simultaneous comparison numerical value comprises that the signal strength values with these comparison numerical value and majority compares.These signal strength values belong to different frequencies, and interrelate with the flow velocity of majority, simultaneously based on the above-mentioned intensity that relatively can detect flow velocity of mentioning.
Yet with regard to another aspect, a rfid system comprises a RFID label apparatus and a RFID reader device.This RFID label apparatus is used to send two kinds of signals, the signal the when signal when namely above-mentioned logical circuit disconnects and logical circuit are connected, and these two kinds of signals have at least a kind of meeting that the request that is subject to is responded.The RFID reader device is used for the RFID label apparatus is sent a request at least.Reading device is installed is the fiducial value between the signal strength values in order to receive signal strength values when connecting from the logical circuit of label and logical circuit and to disconnect, and these fiducial values are converted into the varying level of flow velocity.
In an example, the antenna of RFID label links to each other with the flow velocity pick-up unit, and the logical circuit of a control break-make is arranged at this connection line.Flow velocity pick-up unit and antenna form parallel-connection structure.The circuit that is connected with chip at antenna has logical circuit and a voltage-resistance conversion equipment of controlling break-make, and logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is the variation that the variation of flow velocity pick-up unit both end voltage or electric current is converted to resistance.In logical circuit break-make whether two kinds of situations, this antenna has two kinds of corresponding with it different frequencies, i.e. the first resonant frequency and the second resonant frequency.Connect and this label apparatus is positioned under certain flow velocity when logical circuit, owing to the variation of resonant frequency, will produce the intensity level of unlike signal.
In an example, the RFID label apparatus comprises first, second two antennas.Better, first antenna links to each other with voltage-resistance conversion equipment with the flow velocity pick-up unit, when this label apparatus is placed under certain flow velocity, because the variation of resonant frequency, will produce the different of secondary signal intensity level and first signal intensity level.
The synoptic diagram of the induced current amount flow velocity label 10 that is connected with the RFID label chip for the utility model embodiment flow velocity pick-up unit as shown in Figure 1.As shown in Figure 1, label apparatus 10 comprises 13, two pins 16,17 of 15, one surface-mounted integrated circuits of a base and a double-doublet antenna 11,12.Two pins 16,17 are arranged on the surface-mounted integrated circuit 13, and these two pins outwards link to each other with flow velocity pick-up unit 14, and these two pins are in parallel with the equivalent electrical circuit of antenna at chip internal, and the logical circuit of a control break-make is arranged at the circuit that connects.Flow velocity pick-up unit and antenna form parallel-connection structure.The circuit that is connected with chip at antenna has logical circuit and a voltage-resistance conversion equipment of controlling break-make, and logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is the variation that the variation of flow velocity pick-up unit both end voltage or electric current is converted to resistance.Can control the flow velocity pick-up unit by the break-make of logical circuit and whether be access in the chip circuit, thereby can affect the frequency of the antenna that links to each other with radio-frequency module.When logical circuit disconnected, label antenna was with the first resonant frequency communication.When logical circuit is connected, be placed under certain flow velocity, antenna is operated under the second resonant frequency, and its characteristic frequency and signal intensity have at least one and change.
In an example, transmitting terminal antenna 11,12 is made by one or more different low electrical resistant materials, these materials have higher electric conductivity, copper for example, silver, and aluminium, they and the above-mentioned flow velocity pick-up unit of mentioning are by two pins 16,17 and antenna 11,12 link to each other, when antenna 11,12 are placed under certain flow velocity, and the flow velocity pick-up unit can cause the variation of one or more transmitting terminal generation resonant frequencies.The frequency of the frequency of this variation and reception and transmission is all different.For example, when logical circuit was connected, the flow velocity pick-up unit was positioned under certain flow velocity, will cause that at least one changes in transmission frequency and the receive frequency.
In another example, the antenna frequencies value of setting at the beginning will be higher than the antenna frequencies under the certain flow flow velocity environment, and then when reaching certain flow velocity, it will reduce.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies under the certain flow flow velocity, and it will rise when reaching certain flow velocity.Can be used for such flow velocity pick-up unit of the present utility model has: vortex flow pick-up unit, turbine flow pick-up unit, electromagnetic flow pick-up unit, electromagnetic type flow monitor etc.
Type based on the flow velocity pick-up unit is different, and the flow velocity that causes changing may be that a specific flow velocity value also may be a selectively scope of flow velocity value.The length of time must cause the variation of antenna resonance frequency, and antenna quality also can cause different variations.For example, on the antenna with the type of flow velocity pick-up unit can affect the length that changes the antenna resonance frequency required time.
As shown in Figure 2, be the equivalent circuit diagram of RFID label antenna.When the tag coil antenna enters in the alternating magnetic field that read write line produces, the interaction between label antenna and the reading and writing device antenna just is similar to transformer.Both coils are equivalent to primary coil and the secondary coil of transformer.The resonant tank that is formed by label antenna comprises coil inductance (L), stray capacitance (Cp) and the shunt capacitance (C2) of label antenna as shown in Figure 2, and its resonance frequency is
C is the equivalent capacity in parallel of Cp and C2 in the formula, and R1, R2 are the equivalent resistance of circuit internal inductance coil and other devices.The carrier frequency that label and read write line two-way communication are used is exactly f.The tag antenna coil profile is very little when requiring, be that area is little, and need certain operating distance, the aerial coil mutual induction amount that RFID label and read write line are asked just obviously can not practical requirement, can be at the inner Ferrite Material with high permeability that inserts of tag antenna coil, with the increase mutual induction amount, thus the little problem of compensating coil xsect.
As shown in Figure 3, be the utility model embodiment flow velocity pick-up unit, the logical circuit of control break-make and the synoptic diagram that voltage-resistance conversion equipment is connected with RFID label antenna equivalent electrical circuit.The resonant tank that is formed by label antenna comprises coil inductance (L), stray capacitance (Cp) and the shunt capacitance (C2) of label antenna as shown in the figure, and its resonance frequency is
Formula C is the equivalent capacity in parallel of Cp and C2, and R1, R2 are the equivalent resistance of circuit internal inductance coil and other devices.M is the variable resistor of representative flow velocity pick-up unit, and S is the logical circuit of control break-make, and R3 is the equivalent resistance of connecting with the flow velocity pick-up unit, and F is voltage-resistance conversion equipment.When logical circuit disconnects, the flow velocity pick-up unit not with the sky line parallel, this moment be placed under certain flow velocity, the first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit was connected, the flow velocity pick-up unit was placed under certain flow velocity with a day line parallel, this moment, and antenna features frequency and signal intensity have at least one and change, and this moment, antenna was operated under the second resonant frequency.
As shown in Figure 4, be the utility model embodiment flow velocity pick-up unit and the synoptic diagram that the RFID label antenna directly links to each other, can detect the sketch of the passive RFID tags device 40 of flow velocity variation.As shown in Figure 4, label apparatus 40 comprises 45, one integrated circuit 43 of a base and a double-doublet antenna 41,42.The flow velocity pick-up unit 44 that links to each other with antenna 42 will affect the resistance of antenna 42.The material that flow velocity pick-up unit 44 is suitable for can be controlled the frequency that any one had both been fixed a point according to any one current voltage in the antenna 41,42.With regard to an example, fixing up an aerial wire 41,42 can make it produce resonance in identical frequency.With regard to another example, fixing up an aerial wire 41,42 can make it produce resonance in different frequency.
In an example, transmitting terminal antenna 41,42 is made by one or more different low electrical resistant materials, and these materials have higher electric conductivity, copper for example, silver, and aluminium, they link to each other with the above-mentioned flow velocity pick-up unit of mentioning, when antenna 41,42 are placed under certain flow velocity, and the flow velocity pick-up unit can cause the variation of one or more transmitting terminal generation resonant frequencies, thereby cause a different frequency.The frequency of the variation of this frequency and reception and transmission is all different.For example, the flow velocity pick-up unit is positioned under certain flow velocity, will cause that at least one changes in transmission frequency and the receive frequency.
In another example, the antenna frequencies value of setting at the beginning will be higher than the antenna frequencies under the certain flow flow velocity environment, and then when reaching certain flow velocity, it will reduce.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies under the certain flow flow velocity, and it will rise when reaching certain flow velocity.Can be used for such flow velocity pick-up unit of the present utility model has: vortex flow pick-up unit, turbine flow pick-up unit, electromagnetic flow pick-up unit, electromagnetic type flow monitor etc.
Type based on the flow velocity pick-up unit is different, and the flow velocity that causes changing may be that a specific flow velocity value also may be a selectively scope of flow velocity value.The length of time must cause the variation of antenna resonance frequency, and antenna quality also can cause different variations.For example, on the antenna with the type of flow velocity pick-up unit can affect the length that changes the antenna resonance frequency required time.
As shown in Figure 5, be the turbine flow pick-up unit.It is by permanent magnet 51, coil 52, and 53 electrodes 54,55 unshakable in one's determination, impeller 56, bearing 57 and pipeline 58 form.The rotating speed that is placed on the impeller 56 in the fluid by measurement carries out flow rate test.The theory that it utilizes the rotation rotating speed of turbine to be directly proportional with flow.When impeller 56 places fluid, because the fluoran stream surface of blade is different with the lee side flow velocity, therefore flowing to direction formation pressure reduction, because making, the reasoning that pressure reduction produces revolves the oar rotation.If select the little bearing of friction force to support impeller, and impeller adopts lightweight material to make, as long as then can make the relation of flow velocity and rotating speed approach the rotating speed that linearity records impeller, just know the speed of fluid.
As shown in Figure 6, detect a kind of method flow diagram that flow velocity changes for the utility model by the label apparatus with many antennas.What need to consider is, the above-mentioned device of mentioning carries out and the exchanging of a plurality of antennas with a label integrated circuit.
As shown in Figure 6,50, RFID reader sends energy and instruction to label apparatus.52, logical circuit is in the state of disconnection at initial time, and label apparatus is with the antenna reception energy and the instruction that do not link to each other with the flow velocity pick-up unit.54, label apparatus is converted into DC (direct current) voltage to the electromagnetic wave that carries energy, thereby just can make label carry out the requirement of indication.And this conversion need to be used a charge pump, and a rectification circuit perhaps interconnects it, perhaps will use other energy conversion device.56, the sky alignment reader transmitted signal of label apparatus by not linking to each other with the flow velocity pick-up unit.58, the energy intensity of receiving signal is measured and recorded to reader.60, reader sends the instruction of connecting logical circuit to label apparatus.62, label apparatus uses the antenna that links to each other with the flow velocity pick-up unit to send data.64, the energy intensity of signal is received in the reader measurement.66, reader calculated goes out the fiducial value of a reflected signal intensity.68, reader changes into different flow velocities with fiducial value.With regard to an example, reader can be set the signal that a time period is used for receiving label, if do not receive signal, reader will be recorded as 0 with signal intensity.
In this system, reader will from the signal strength values of the antenna that does not link to each other with the flow velocity pick-up unit as a reference value, compare its signal strength values with the label antenna that links to each other with the flow velocity pick-up unit.By receive from the signal that links to each other with the flow velocity pick-up unit with the transmitting terminal that does not link to each other with the flow velocity pick-up unit, reader can be collected the fiducial value that represents unlike signal intensity.Then, the RFID reader can be converted into the residing flow velocity of label to such fiducial value.With regard to a concrete example, dispose this RFID reader and be for by use that the reference data that stores will receive from connect or not the difference of the RF signal intensity of the antenna of connection traffic flow monitor be converted into the flow velocity value.
Best situation is, the antenna of connection traffic flow monitor not as a reference, can be filtered out the variation that causes owing to the coupling between label and the reader.In addition, just as previously mentioned, the flow velocity pick-up unit is applied to the time length that the variation of the resistance value that can make it in the design and label be placed under the particular flow rate flow velocity and forms one to one relation.For example, the flow velocity pick-up unit is only positioned at an antenna, can allow like this to change within the specific limits as a kind of function from the signal of RFID label apparatus, and this function just antenna be placed on the function that just has after time under the certain flow flow velocity.The same, by using the utility model, under the passive condition of RFID label, the RFID reader can detect label apparatus whether be placed under certain flow velocity and this flow velocity whether within the acceptable range.
Also can not perceive with the flow velocity pick-up unit variation of flow velocity with the various RFID labels of two antennas, the variation that the variation of perceived flux flow velocity is based on resonant frequency on the antenna also can recognize antenna reception to the variation of signal.
For example pass through the design to the antenna that links to each other with the flow velocity pick-up unit, can make the frequency of antenna at ISM (Industrial Scientific Medical, industry, science, medical science) the interior variation of frequency range, can connect this antenna that links to each other with flow velocity pick-up unit and logical circuit on the label of standard.
For example label antenna can so be set in a concrete example, before in being exposed to certain flow flow velocity environment, the resonant frequency of antenna is 902-928MHZ, but in a single day label is exposed in the certain flow flow velocity environment, because the impact of flow velocity, the resonant frequency of antenna is just reduced to 8995-927.5MHZ, frequency frequency range (902-928MHZ) at U.S. RFID is split into 52 channels, reader can be skipped the channel that can not receive at random in these 52 channels, and the benefit of this jump of reader is exactly can a plurality of readers of effectively preventing to attempt the conflict of using same frequency to cause in same physical space.
For example in an example, RFID frequency range (902-928MHZ) is not to be divided into 52 channels but the antenna settings that on average has been divided into n channel tag is carried out work under this frequency range (902-928MHZ).Because label antenna links to each other with the flow velocity pick-up unit, so as long as flow velocity has surpassed the scope of predefined value, the frequency of operation of antenna tag antenna just drops among (899.5-927.5MHZ) this frequency range.Therefore compare just channel n to be got rid of from band limits with original frequency range and go, the frequency range (899.5-927.5MHZ) after therefore changing just no longer allows label to carry out exchanging of information with channel n.
In concrete example, if the environment at label place has surpassed the flow velocity scope of expection, reader can only send instruction to label by channel 1 to n-1, label also can be made a response, because the antenna in the label just can only be worked in this frequency range, when reader sends instruction with the frequency of n channel to label, because the variation of label flow velocity has caused the resonant frequency of label antenna to drop to 899.5-927.5MHZ, just no longer make a response so no longer reach the 928MHZ label, pass information back reader.
Favourable aspect is because flow velocity has exceeded the variation of the operating frequency of antenna that predefined value causes, is just reflected by the disappearance of this information interchange.
In model, reader can send an instruction between channel n-1 and channel n to label and check that further drift has occured the operating frequency range of label antenna, because label can receive the instruction that sends by channel n-1, and can be to the reader feedback information by channel n-1, because label can not receive the instruction that sends by channel n, and can not can to the reader feedback information, so just determine that drift has occured the operating frequency range of label antenna by channel n.
Drift and the utility model that the variation of flow velocity causes the frequency of operation of label antenna to occur up and down are not limited in frequency range on average are divided into n channel.
The utility model embodiment can detect flow velocity at lower cost to be changed, and the energy that utilizes RFID to obtain, and has solved the powerup issue that flow velocity detects.
The enforcement of each characteristics of this system may relate to software, the combination that hardware also may relate to software and hardware just can reach, and for example the enforcement of many advantages of system is to realize with the mutual mode that exchanges of computer and other equipment machines with OO programming language with a kind of high-caliber processing by programming.Each such function program may be stored in the storage intermediary and for example be read to realize above-mentioned function by a computer and processor in the ROM (read-only memory).
Those skilled in the art can also recognize the various illustrative components, blocks (illustrative logical block) that the utility model embodiment lists, the unit, and step can pass through electronic hardware, computer software, or both combinations realize.Be the clear replaceability (interchangeability) of showing hardware and software, above-mentioned various illustrative components (illustrative components), unit and step have been described their function generally.Such function is to realize depending on the designing requirement of specific application and whole system by hardware or software.Those skilled in the art can be for every kind of specific application, and can make ins all sorts of ways realizes described function, but this realization should not be understood to exceed the scope of the utility model embodiment protection.
Various illustrative logical block described in the utility model embodiment, or the unit can pass through general processor, digital signal processor, special IC (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the design of above-mentioned any combination realizes or operates described function.General processor can be microprocessor, and alternatively, this general processor also can be any traditional processor, controller, microcontroller or state machine.Processor also can realize by the combination of calculation element, for example digital signal processor and microprocessor, multi-microprocessor, Digital Signal Processor Core of one or more microprocessors associatings, or any other similarly configuration realize.
Method described in the utility model embodiment or the step of algorithm can directly embed hardware, the software module of processor execution or the two combination.Software module can be stored in the storage medium of other arbitrary form in RAM storer, flash memory, ROM storer, eprom memory, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or this area.Exemplarily, storage medium can be connected with processor so that processor can be from storage medium reading information, and can deposit write information to storage medium.Alternatively, storage medium can also be integrated in the processor.Processor and storage medium can be arranged among the ASIC, and ASIC can be arranged in the user terminal.Alternatively, processor and storage medium also can be arranged in the different parts in the user terminal.
In one or more exemplary designs, the described above-mentioned functions of the utility model embodiment can realize in hardware, software, firmware or this three's combination in any.If realize in software, these functions can be stored on the medium with computer-readable, or are transmitted on the medium of computer-readable with one or more instructions or code form.The computer-readable medium comprises the computer storage medium and is convenient to so that allow computer program transfer to other local telecommunication media from a place.Storage medium can be the useable medium that any general or special computer can access.For example, such computer readable media can include but not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device, or other anyly can be used for carrying or storage can be read by general or special computer or general or special processor the program code of form with instruction or data structure and other medium.In addition, any connection can suitably be defined as the computer-readable medium, for example, if software is by a concentric cable, optical fiber computer, twisted-pair feeder, Digital Subscriber Line (DSL) or also being comprised in the defined computer-readable medium with wireless way for transmittings such as infrared, wireless and microwave from a web-site, server or other remote resource.Described video disc (disk) and disk (disc) comprise Zip disk, radium-shine dish, CD, DVD, floppy disk and Blu-ray Disc, and disk is usually with the magnetic duplication data, and video disc carries out the optical reproduction data with laser usually.Above-mentioned combination also can be included in the computer-readable medium.
Above-described embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; the above only is embodiment of the present utility model; and be not used in and limit protection domain of the present utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1. the RFID label with the flow velocity pick-up unit is characterized in that, two pins are arranged on the chip of described RFID label; Two pins of described flow velocity pick-up unit and this link to each other, and form parallel-connection structure with the antenna of described RFID label, the variation of extraneous flow velocity can cause the variation of flow velocity pick-up unit both end voltage or electric current, the circuit that is connected with the chip of RFID label at described flow velocity pick-up unit has logical circuit and a voltage-resistance conversion equipment of controlling break-make, the circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip, voltage-resistance conversion equipment is used for the variation of flow velocity pick-up unit both end voltage or electric current is converted to the variation of resistance, the break-make of logical circuit determined the flow velocity pick-up unit whether with the sky line parallel: when logical circuit disconnects, the flow velocity pick-up unit not with the sky line parallel, be placed under certain flow velocity this moment, and the first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, the flow velocity pick-up unit was placed under certain flow velocity with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have at least one and change, and this moment, antenna was operated under the second resonant frequency; Described RFID label receives the instruction of RFID reader transmission with the break-make of control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna by comparison the change of flow velocity.
2. as claimed in claim 1 with the RFID label of flow velocity pick-up unit, it is characterized in that the antenna of described RFID label is monopole antenna.
3. as claimed in claim 1 with the RFID label of flow velocity pick-up unit, it is characterized in that the antenna of described RFID label is double-doublet antenna: described flow velocity pick-up unit and the voltage that links to each other with this flow velocity pick-up unit-resistance conversion equipment form parallel-connection structure with antenna wherein; Perhaps described flow velocity pick-up unit forms parallel-connection structure simultaneously with the voltage that links to each other with this flow velocity pick-up unit-resistance conversion equipment and two antennas.
4. the RFID label with the flow velocity pick-up unit is characterized in that, a pin is arranged on the chip of described RFID label; One end of described flow velocity pick-up unit links to each other with this pin, the other end is connected on the antenna of described RFID label, and form parallel-connection structure with antenna, the variation of extraneous flow velocity can cause the variation of flow velocity pick-up unit both end voltage or electric current, the circuit that is connected with the chip of RFID label at described flow velocity pick-up unit has logical circuit and a voltage-resistance conversion equipment of controlling break-make, the circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip, voltage-resistance conversion equipment is used for the variation of flow velocity pick-up unit both end voltage or electric current is converted to the variation of resistance, the break-make of logical circuit determined the flow velocity pick-up unit whether with the sky line parallel: when logical circuit disconnects, the flow velocity pick-up unit not with the sky line parallel, be placed under certain flow velocity this moment, and the first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, the flow velocity pick-up unit was placed under certain flow velocity with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have at least one and change, and this moment, antenna was operated under the second resonant frequency; Described RFID label receives the instruction of RFID reader transmission with the break-make of control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna by comparison the change of flow velocity.
5. as claimed in claim 4 with the RFID label of flow velocity pick-up unit, it is characterized in that the antenna of described RFID label is monopole antenna.
6. as claimed in claim 4 with the RFID label of flow velocity pick-up unit, it is characterized in that the antenna of described RFID label is double-doublet antenna: described flow velocity pick-up unit and the voltage that links to each other with this flow velocity pick-up unit-resistance conversion equipment form parallel-connection structure with antenna wherein; Perhaps described flow velocity pick-up unit forms parallel-connection structure simultaneously with the voltage that links to each other with this flow velocity pick-up unit-resistance conversion equipment and two antennas.
7. RFID label with the flow velocity pick-up unit, it is characterized in that, described flow velocity pick-up unit is connected on the antenna of described RFID label, and form parallel-connection structure with antenna, the variation of extraneous flow velocity can cause the variation of flow velocity pick-up unit both end voltage or electric current, the circuit that is connected with antenna at described flow velocity pick-up unit has logical circuit and a voltage-resistance conversion equipment of controlling break-make, the circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip, voltage-resistance conversion equipment is used for the variation of flow velocity pick-up unit both end voltage or electric current is converted to the variation of resistance, the break-make of logical circuit determined the flow velocity pick-up unit whether with the sky line parallel: when logical circuit disconnects, the flow velocity pick-up unit not with the sky line parallel, be placed under certain flow velocity this moment, and the first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, the flow velocity pick-up unit was placed under certain flow velocity with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have at least one and change, and this moment, antenna was operated under the second resonant frequency; Described RFID label receives the instruction of RFID reader transmission with the break-make of control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna by comparison the change of flow velocity.
8. as claimed in claim 7 with the RFID label of flow velocity pick-up unit, it is characterized in that the antenna of described RFID label is monopole antenna.
9. as claimed in claim 7 with the RFID label of flow velocity pick-up unit, it is characterized in that the antenna of described RFID label is double-doublet antenna: described flow velocity pick-up unit and the voltage that links to each other with this flow velocity pick-up unit-resistance conversion equipment form parallel-connection structure with antenna wherein; Perhaps described flow velocity pick-up unit forms parallel-connection structure simultaneously with the voltage that links to each other with this flow velocity pick-up unit-resistance conversion equipment and two antennas.
10. rfid system with the flow velocity pick-up unit, described rfid system comprises RFID label and RFID reader, it is characterized in that,
Described RFID label comprises each described RFID label with the flow velocity pick-up unit among the claim 1-3, or each described RFID label with the flow velocity pick-up unit among the claim 4-6, or each described RFID label with the flow velocity pick-up unit among the claim 7-9;
Described RFID reader sends instruction with the break-make of the logical circuit of control RFID label, thereby detects the change of flow velocity from the difference between the signal intensity of the different frequency of antenna by comparison.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220259477 CN202694398U (en) | 2012-06-01 | 2012-06-01 | RFID (Radio Frequency Identification) tag and RFID system with flow and flow speed detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220259477 CN202694398U (en) | 2012-06-01 | 2012-06-01 | RFID (Radio Frequency Identification) tag and RFID system with flow and flow speed detection device |
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| Publication Number | Publication Date |
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| CN202694398U true CN202694398U (en) | 2013-01-23 |
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|---|---|---|---|
| CN 201220259477 Expired - Fee Related CN202694398U (en) | 2012-06-01 | 2012-06-01 | RFID (Radio Frequency Identification) tag and RFID system with flow and flow speed detection device |
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| CN (1) | CN202694398U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103413157A (en) * | 2013-08-01 | 2013-11-27 | 复旦大学 | RFID reader-writer capable of detecting number of labels within time slot and detection method of RFID reader-writer |
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2012
- 2012-06-01 CN CN 201220259477 patent/CN202694398U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103413157A (en) * | 2013-08-01 | 2013-11-27 | 复旦大学 | RFID reader-writer capable of detecting number of labels within time slot and detection method of RFID reader-writer |
| CN103413157B (en) * | 2013-08-01 | 2018-02-23 | 复旦大学 | A kind of RFID reader and its detection method that can detect time slot interior label number |
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Granted publication date: 20130123 Termination date: 20130601 |