CN102750573A - Radio frequency identification device (RFID) system for measuring flow volume and flow velocity and method for measuring flow volume and flow velocity of system - Google Patents
Radio frequency identification device (RFID) system for measuring flow volume and flow velocity and method for measuring flow volume and flow velocity of system Download PDFInfo
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- CN102750573A CN102750573A CN2012101834285A CN201210183428A CN102750573A CN 102750573 A CN102750573 A CN 102750573A CN 2012101834285 A CN2012101834285 A CN 2012101834285A CN 201210183428 A CN201210183428 A CN 201210183428A CN 102750573 A CN102750573 A CN 102750573A
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Abstract
The invention provides an RFID system for measuring flow volume and a flow velocity and a method for measuring the flow volume and the flow velocity of the system. The system comprise an RFID reader, a first RFID label and a second RFID label, wherein the labels are provided with the same chips and the same antennas; the first RFID label is arranged under certain flow volume and a certain flow velocity and works under a first resonant frequency; the second RFID label is provided with a flow volume and flow velocity detection device, the flow volume and flow velocity detection device and the antenna of the second RFID form a parallel connection structure, a voltage-resistance switching device is arranged on a line through which the flow volume and flow velocity detection device and a chip of the second RFID label are connected, the connected line and the voltage-resistance switching device are part of the chip, and the second RFID label is arranged under certain flow volume and a certain flow velocity and works under a second resonant frequency; the first RFID label and the second RFID label respectively receive an instruction sent by the RFID reader and performs feedback of signals, and the RFID reader detects changes of the flow volume and the flow velocity by comparison of differences of among signal intensities of different frequencies of the first RFID label and the second RFID label. The changes of the flow volume and the flow velocity can be detected with low cost.
Description
Technical field
The present invention relates to RFID (Radio Frequency Identification, RF identification) technical field, relate in particular to a kind of method of rfid system and measurement of discharge flow velocity thereof of measurement of discharge flow velocity.
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 the radiofrequency signal from one or more RFID labels can launched and accept to this RFID reader in the scope of a setting.This RFID label generally encapsulates; Can be attached on the object, it comprises the chip that an ability and antenna carry out information interchange, and this chip is a microchip; It is an integrated circuit in general; It can be used for storing and process information, the modulation radiofrequency signal, and can move other specific function.The antenna of RFID label is to be used for receiving and sending radiofrequency signal, and is applicable to a kind of special frequency usually.
In some equipment, when the flow velocity that a kind of rfid system of measurement of discharge flow velocity has been used to monitor product environment of living in has surpassed the acceptable flow velocity.In general these equipment requirements 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 requirements 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, its requires when not using lasting energy source or use a kind of adjunct circuit cheaply, can be used for detecting flow velocity and changes.
Summary of the invention
The embodiment of the invention provides a kind of method of rfid system and measurement of discharge flow velocity thereof of measurement of discharge flow velocity, detects flow velocity at lower cost and changes.
On the one hand; The embodiment of the invention provides a kind of rfid system of measurement of discharge flow velocity; The rfid system of said measurement of discharge flow velocity comprises: RFID reader, a RFID label and the 2nd RFID label, and a said RFID label has identical chip and antenna with said the 2nd RFID label; A said RFID label is placed under certain flow velocity, and first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency; Said the 2nd RFID label has two pins for the RFID label of band flow velocity pick-up unit on the chip of said the 2nd RFID label; Two pins of said flow velocity pick-up unit and this link to each other; And form parallel-connection structure with the antenna of said the 2nd RFID label; On flow velocity pick-up unit and circuit that the chip of the 2nd RFID label is connected, one voltage-resistance conversion equipment is arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment; The variation of extraneous flow velocity can cause flow velocity pick-up unit voltage or change in current; This moment, said the 2nd RFID label was placed under certain flow velocity, and the characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency; A said RFID label and said the 2nd RFID label receive instruction and the feedback signal that said RFID reader sends respectively, and said RFID reader is through relatively detecting the change of flow velocity from the difference between the signal intensity of a said RFID label and said the 2nd RFID label different frequency.
Optional, in an embodiment of the present invention, the antenna of a said RFID label and said the 2nd RFID label is monopole antenna: the antenna of described flow velocity pick-up unit and said the 2nd RFID label forms parallel-connection structure.
Optional; In an embodiment of the present invention; The antenna of a said RFID label and said the 2nd RFID label is double-doublet antenna: an antenna of described flow velocity pick-up unit and said the 2nd RFID label forms parallel-connection structure, perhaps forms parallel-connection structure simultaneously with two antennas.
Optional; In an embodiment of the present invention; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET to, and said 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 embodiment of the invention provides a kind of rfid system of measurement of discharge flow velocity; The rfid system of said measurement of discharge flow velocity comprises: RFID reader, a RFID label and the 2nd RFID label, and a said RFID label has identical chip and antenna with said the 2nd RFID label; A said RFID label is placed under certain flow velocity, and first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency; Said the 2nd RFID label has a pin for the RFID label of band flow velocity pick-up unit on the chip of said the 2nd RFID label; One end of said flow velocity pick-up unit links to each other with this pin; The other end is connected on the antenna of said RFID label; And form parallel-connection structure with antenna; On flow velocity pick-up unit and circuit that the chip of the 2nd RFID label is connected, one voltage-resistance conversion equipment is arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment, and the variation of extraneous flow velocity can cause flow velocity pick-up unit voltage or change in current, and this moment, said the 2nd RFID label was placed under certain flow velocity; The characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency; A said RFID label and said the 2nd RFID label receive instruction and the feedback signal that said RFID reader sends respectively, and said RFID reader is through relatively detecting the change of flow velocity from the difference between the signal intensity of a said RFID label and said the 2nd RFID label different frequency.
Optional, in an embodiment of the present invention, the antenna of a said RFID label and said the 2nd RFID label is monopole antenna: the antenna of described flow velocity pick-up unit and said the 2nd RFID label forms parallel-connection structure.
Optional; In an embodiment of the present invention; The antenna of a said RFID label and said the 2nd RFID label is double-doublet antenna: an antenna of described flow velocity pick-up unit and said the 2nd RFID label forms parallel-connection structure, perhaps forms parallel-connection structure simultaneously with two antennas.
Optional; In an embodiment of the present invention; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET to, and said 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 embodiment of the invention provides a kind of rfid system of measurement of discharge flow velocity; The rfid system of said measurement of discharge flow velocity comprises: RFID reader, a RFID label and the 2nd RFID label, and a said RFID label has identical chip and antenna with said the 2nd RFID label; A said RFID label is placed under certain flow velocity, and first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency; Said the 2nd RFID label is the RFID label of band flow velocity pick-up unit; Said flow velocity pick-up unit is connected on the antenna of said RFID label; And form parallel-connection structure with antenna; On flow velocity pick-up unit and circuit that the chip of the 2nd RFID label is connected, one voltage-resistance conversion equipment is arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment, and the variation of extraneous flow velocity can cause flow velocity pick-up unit voltage or change in current, and this moment, said the 2nd RFID label was placed under certain flow velocity; The characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency; A said RFID label and said the 2nd RFID label receive instruction and the feedback signal that said RFID reader sends respectively, and said RFID reader is through relatively detecting the change of flow velocity from the difference between the signal intensity of a said RFID label and said the 2nd RFID label different frequency.
Optional, in an embodiment of the present invention, the antenna of a said RFID label and said the 2nd RFID label is monopole antenna: the antenna of described flow velocity pick-up unit and said the 2nd RFID label forms parallel-connection structure.
Optional; In an embodiment of the present invention; The antenna of a said RFID label and said the 2nd RFID label is double-doublet antenna: an antenna of described flow velocity pick-up unit and said the 2nd RFID label forms parallel-connection structure, perhaps forms parallel-connection structure simultaneously with two antennas.
Optional; In an embodiment of the present invention; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET to, and said 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.
Again on the one hand; The embodiment of the invention provides a kind of method of rfid system measurement of discharge flow velocity of measurement of discharge flow velocity; Said method is applied to the rfid system of above-mentioned measurement of discharge flow velocity; Comprise: a said RFID label is placed under certain flow velocity, and first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency: said the 2nd RFID label is placed under certain flow velocity; The characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency; Send instruction through said RFID reader and give a said RFID label and said the 2nd RFID label and receiving feedback signals; Difference when utilizing the work of more said RFID label of said RFID reader and said the 2nd RFID label between the signal intensity of different frequency detects the change of flow velocity.
Technique scheme has following beneficial effect: because adopt the rfid system of said measurement of discharge flow velocity to comprise: RFID reader, a RFID label and the 2nd RFID label, and a said RFID label has identical chip and antenna with said the 2nd RFID label; A said RFID label is placed under certain flow velocity, and a said RFID label is operated under first resonant frequency; Said the 2nd RFID label is the RFID label of band flow velocity pick-up unit; The antenna of said flow velocity pick-up unit and said the 2nd RFID label forms parallel-connection structure; On flow velocity pick-up unit and circuit that the chip of the 2nd RFID label is connected, one voltage-resistance conversion equipment is arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment; This moment, said the 2nd RFID label was placed under certain flow velocity, and said the 2nd RFID label is operated under second resonant frequency; A said RFID label and said the 2nd RFID label receive instruction and the feedback signal that said RFID reader sends respectively; Said RFID reader is through relatively detecting the technological means of the change of flow velocity from the difference between the signal intensity of a said RFID label and said the 2nd RFID label different frequency; So reached and detected the technique effect that flow velocity changes at lower cost; 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 embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the rfid system structural representation of a kind of measurement of discharge flow velocity of the embodiment of the invention,
The synoptic diagram that Fig. 2 is connected with the 2nd RFID label chip for embodiment of the invention flow velocity pick-up unit;
Fig. 3 is the equivalent circuit diagram of the embodiment of the invention the 2nd RFID label chip inside antenna;
Fig. 4 is the synoptic diagram that embodiment of the invention flow velocity pick-up unit, voltage-resistance conversion equipment are connected with the 2nd RFID label chip inside antenna equivalent electrical circuit;
The synoptic diagram that Fig. 5 directly is connected for embodiment of the invention flow velocity pick-up unit and RFID label antenna;
Fig. 6 is the structure key diagram of embodiment of the invention flow velocity pick-up unit;
Fig. 7 is the method flow diagram of the embodiment of the invention based on the measurement of discharge flow velocity of signal intensity.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
As shown in Figure 1; Rfid system structural representation for a kind of measurement of discharge flow velocity of the embodiment of the invention; The rfid system of said measurement of discharge flow velocity comprises: RFID reader 1, a RFID label 2 and the 2nd RFID label 3, and a said RFID label 2 has identical chip and antenna with said the 2nd RFID label 3; A said RFID label 2 is placed under certain flow velocity, and first resonant frequency and the signal intensity of the antenna of a said RFID label 2 remain unchanged, and this moment, a said RFID label 2 was operated under first resonant frequency; Said the 2nd RFID label 3 is the RFID label of band flow velocity pick-up unit; The antenna of said flow velocity pick-up unit and said the 2nd RFID label 3 forms parallel-connection structure; On flow velocity pick-up unit and circuit that the chip of the 2nd RFID label is connected, one voltage-resistance conversion equipment is arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment; The variation of extraneous flow velocity can cause flow velocity pick-up unit voltage or change in current; This moment, said the 2nd RFID label was placed under certain flow velocity, and the characteristic frequency of the antenna of said the 2nd RFID label 3 and signal intensity have one at least and change, and this moment, said the 2nd RFID label 3 was operated under second resonant frequency; A said RFID label 2 receives instruction and the feedback signal that said RFID reader 1 sends respectively with said the 2nd RFID label 3, and said RFID reader 1 is through relatively detecting the change of flow velocity from the difference between the signal intensity of a said RFID label 2 and said the 2nd RFID label 3 different frequencies.The flow velocity pick-up unit of the embodiment of the invention links to each other with the chip of the 2nd RFID label and has three kinds of situation at least:
The two pins structure:
The embodiment of the invention is a kind of rfid system that flow velocity changes that is used for detecting.This system has comprised two RFID labels: a RFID label and the 2nd RFID label.Two pins are arranged on the chip of the 2nd RFID label; Two pins of flow velocity pick-up unit and this link to each other; Form parallel-connection structure with antenna; On flow velocity pick-up unit and circuit that the chip of the 2nd RFID label is connected, one voltage-resistance conversion equipment is arranged, the circuit of this connection is the part of chip with this voltage-resistance conversion equipment, and the variation of extraneous flow velocity can cause flow velocity pick-up unit voltage or change in current.This moment, said the 2nd RFID label was placed under certain flow velocity, and first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency.The RFID reader can send instruction to label, realizes communication, and the difference in the time of can be through a RFID label and the 2nd RFID label work relatively between the signal intensity of different frequency detects the change of flow velocity.
With regard to an instance, this system has comprised a kind of RFID label, and said label comprises a RFID label and the 2nd RFID label, and a RFID label and the 2nd RFID label all have only an antenna.Two pins are arranged on the chip of the 2nd RFID label, and two pins of flow velocity pick-up unit and this link to each other, and form parallel-connection structure with antenna.On flow velocity pick-up unit and circuit that the chip of the 2nd RFID label is connected, one voltage-resistance conversion equipment is arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment; The variation of extraneous flow velocity can cause flow velocity pick-up unit voltage or change in current; This moment, said the 2nd RFID label was placed under certain flow velocity, and first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency.The RFID reader can send instruction to label, realizes communication, and the difference in the time of can be through a RFID label and the 2nd RFID label work relatively between the signal intensity of different frequency detects the change of flow velocity.
Or rather; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET etc. to, and said 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 instance, this system has comprised two RFID labels: a RFID label and the 2nd RFID label; The one RFID label and the 2nd RFID label all have two antennas.Two pins are arranged on the chip of the 2nd RFID label; Two pins of flow velocity pick-up unit and this link to each other; Form parallel-connection structure simultaneously with two antennas; On flow velocity pick-up unit and circuit that the chip of the 2nd RFID label is connected, one voltage-resistance conversion equipment is arranged, the circuit of this connection is the part of chip with this voltage-resistance conversion equipment.The variation of extraneous flow velocity can cause flow velocity pick-up unit voltage or change in current.The situation that this and the 2nd RFID label only contain an antenna is similar.Be placed under certain flow velocity this moment, and first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label antenna was operated under second resonant frequency.The RFID reader can send instruction to label, realizes communication, and the difference in the time of can be through a RFID label and the 2nd RFID label work relatively between the signal intensity of different frequency detects the change of flow velocity.Or rather; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET etc. to, and said 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:
This system has comprised two RFID labels: a RFID label and the 2nd RFID label; A pin is arranged on the chip of the 2nd RFID label; 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 day line parallel.On flow velocity pick-up unit and circuit that the chip of the 2nd RFID label is connected, one voltage-resistance conversion equipment is arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment, and the variation of extraneous flow velocity can cause flow velocity pick-up unit voltage or change in current.Be placed under certain flow velocity this moment, and first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label antenna was operated under second resonant frequency.The RFID reader can send instruction to label, realizes communication, and the difference in the time of can be through a RFID label and the 2nd RFID label work relatively between the signal intensity of different frequency detects the change of flow velocity.
With regard to an instance, this system has comprised two RFID labels: a RFID label and the 2nd RFID label; The one RFID label and the 2nd RFID label all have only an antenna.A pin is arranged on the chip of the 2nd RFID label; The flow velocity pick-up unit links to each other with this pin; The flow velocity pick-up unit other end is directly linked on the antenna; Form parallel-connection structure with antenna, on flow velocity pick-up unit and circuit that the chip of the 2nd RFID label is connected, one voltage-resistance conversion equipment is arranged, the circuit of this connection and this voltage-resistance conversion equipment are the parts of chip.The variation of extraneous flow velocity can cause flow velocity pick-up unit voltage or change in current.Be placed under certain flow velocity this moment, and first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label antenna was operated under second resonant frequency.The RFID reader can send instruction to label, realizes communication, and the difference in the time of can be through a RFID label and the 2nd RFID label work relatively between the signal intensity of different frequency detects the change of flow velocity.Or rather; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET etc. to, and said 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.
No pin configuration:
This system has comprised two RFID labels: a RFID label and the 2nd RFID label, there is not pin on the chip of the 2nd RFID label, and the flow velocity pick-up unit is directly linked on the antenna.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 with normal frequency for communication.When being placed under certain flow velocity, the characteristic frequency of antenna and signal intensity have one at least and change.The RFID reader can send instruction to label apparatus, realizes communication, through relatively detect the change of flow velocity from the difference between the signal intensity of the different frequency of a RFID label and the 2nd RFID label.
With regard to an instance, this system has comprised two RFID labels: a RFID label and the 2nd RFID label; The one RFID label and the 2nd RFID label all have only an antenna.There is not pin on the chip of the 2nd RFID label; The flow velocity pick-up unit is directly linked on the antenna; On flow velocity pick-up unit and circuit that the chip of the 2nd RFID label is connected, one voltage-resistance conversion equipment is arranged, the circuit of this connection is the part of chip with this voltage-resistance conversion equipment.The variation of extraneous flow velocity can cause flow velocity pick-up unit voltage or change in current.Be placed under certain flow velocity this moment, and first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label antenna was operated under second resonant frequency.The RFID reader can send instruction to label, and the difference between the signal intensity of the different frequency during through relatively a RFID label and second label work can detect the change of flow velocity.Or rather; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET etc. to, and said 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 one or more flow velocity pick-up units accordingly, the model of flow velocity pick-up unit can be the same or different simultaneously.With regard to a kind of instantiation of device, when being placed under certain flow velocity, the characteristic 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.The RFID 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 through comparison.
With regard to a kind of instantiation of flow velocity pick-up unit, the method for simultaneous comparison numerical value comprises that these are compared numerical value compares with most signal strength values.These signal strength values belong to different frequencies, and interrelate with the flow velocity value of majority, can detect the level of flow velocity simultaneously based on the above-mentioned comparison of mentioning.
Yet with regard to another aspect, a rfid system comprises two RFID label apparatus and a RFID reader device.These two RFID label apparatus are used to send two kinds of signals; Promptly; The signal of the signal of the one RFID label and the 2nd RFID label; Reader is received the signal of a RFID label and the signal of the 2nd RFID label respectively, through the fiducial value between the signal strength values of RFID label of background process and the 2nd RFID label, and is converted into these fiducial values the varying level of flow velocity.
Again on the one hand; The embodiment of the invention provides a kind of method of rfid system measurement of discharge flow velocity of measurement of discharge flow velocity; Said method is applied to the rfid system of above-mentioned measurement of discharge flow velocity; Comprise: a said RFID label is placed under certain flow velocity, and first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency: said the 2nd RFID label is placed under certain flow velocity; The characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency; Send instruction through said RFID reader and give a said RFID label and said the 2nd RFID label and receiving feedback signals; Difference when utilizing the work of more said RFID label of said RFID reader and said the 2nd RFID label between the signal intensity of different frequency detects the change of flow velocity.
As shown in Figure 2, the synoptic diagram of the flow velocity tags detected 10 that is connected with the 2nd RFID label chip for embodiment of the invention flow velocity pick-up unit.Among Fig. 2, 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 parallelly connected with the equivalent electrical circuit of antenna at chip internal.This label can communicate with reader.
In an example, transmitting terminal 11,12 is processed by one or more different low electrical resistant materials, and these materials have higher electric conductivity; Copper for example, silver, and aluminium, they with the above-mentioned flow velocity pick-up unit of mentioning through two pins 16; 17 is continuous with antenna 11,12, 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, 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 sending frequency and accept that at least one changes in the 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 when reaching certain flow velocity, it will reduce then.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 invention 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 possibly be that a specific flow velocity value also possibly be a scope of flow velocity value selectively.The length of time must cause the variation of antenna resonance frequency, and antenna quality also can cause different variations.The type of the flow velocity pick-up unit that for example, has on the antenna can influence the length that changes the antenna resonance frequency required time.
As shown in Figure 3, be the equivalent circuit diagram of a RFID label antenna.In the alternating magnetic field that tag coil antenna entering 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 the primary coil and the secondary coil of transformer.Resonant tank by label antenna forms is as shown in the figure, comprises coil inductance (L), the stray capacitance (C of label antenna
p) and shunt capacitance (C
2), its resonance frequency does
C is C in the formula
pAnd C
2Parallelly connected equivalent capacity, R
1, R
2Equivalent resistance for 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 have the Ferrite Material of high permeability in the inner insertion of tag antenna coil; With the increase mutual induction amount, thus the little problem of compensating coil xsect.
As shown in Figure 4, be embodiment of the invention flow velocity pick-up unit, voltage-resistance conversion equipment and the synoptic diagram that is connected with the 2nd RFID label antenna equivalent electrical circuit.Resonant tank by label antenna forms is as shown in the figure, comprises coil inductance (L), the stray capacitance (C of label antenna
p) and shunt capacitance (C
2), its resonance frequency does
Formula C is C
pAnd C
2Parallelly connected equivalent capacity, R
1, R
2Equivalent resistance for circuit internal inductance coil and other devices.R
3Be the equivalent resistance of connecting with the flow velocity pick-up unit, F is voltage-resistance conversion equipment.M is the variable resistor of representative flow velocity pick-up unit.This label is placed under certain flow velocity, and its characteristic frequency and signal intensity have one at least and change, and antenna is operated under second resonant frequency.
As shown in Figure 5, can detect the sketch of the passive RFID tags device 40 that flow velocity changes for the embodiment of the invention.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 influence 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 instance, fixing up an aerial wire 41,42 can make it produce resonance in identical frequency.With regard to another instance, fixing up an aerial wire 41,42 can make it produce resonance in different frequency.
In an example, transmitting terminal double-doublet antenna 41,42 is processed by one or more different low electrical resistant materials; 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 sending frequency and accept that at least one changes in the 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 when reaching certain flow velocity, it will reduce then.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.The such flow velocity pick-up unit that can be used for this invention comprises: 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 possibly be that a specific flow velocity value also possibly be a scope of flow velocity value selectively.The length of time must cause the variation of antenna resonance frequency, and antenna quality also can cause different variations.The type of the flow velocity pick-up unit that for example, has on the antenna can influence the length that changes the antenna resonance frequency required time.
As shown in Figure 6, be the turbine flow pick-up unit.It is by permanent magnet 61, coil 62, and 63 electrodes 64,65 unshakable in one's determination, impeller 66, bearing 67 and pipeline 68 are formed.The rotating speed that is placed on the impeller 66 in the fluid through 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 66 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 produced revolves the oar rotation.If select the little bearing of friction force to support impeller, and impeller adopts lightweight material to process, as long as the relation that then can make flow velocity and rotating speed records the rotating speed of impeller near linearity, just know the speed of fluid.
As shown in Figure 7, be the method flow diagram of the embodiment of the invention based on the measurement of discharge flow velocity of signal intensity, said method is applied to the rfid system of above-mentioned measurement of discharge flow velocity, comprising:
701, a said RFID label is placed under certain flow velocity, first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency:
702, said the 2nd RFID label is placed under certain flow velocity, the characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency;
703, send instruction through said RFID reader and give a said RFID label and said the 2nd RFID label and receiving feedback signals;
Difference when 704, utilizing the work of more said RFID label of said RFID reader and said the 2nd RFID label between the signal intensity of different frequency detects the change of flow velocity.
The RFID reader can be measured the energy intensity of receiving signal, calculates the fiducial value of a reaction signal intensity, then fiducial value is changed into different flow velocity values.With regard to an instance, 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; The RFID reader will compare its signal strength values with the 2nd RFID label that links to each other with the flow velocity pick-up unit from the signal strength values of a RFID label that does not link to each other with the flow velocity pick-up unit as a reference value.Through receive from linking to each other with the flow velocity pick-up unit and a RFID label that does not link to each other and the signal of the 2nd RFID label with the flow velocity pick-up unit, the RFID reader can be collected the fiducial value of representing 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 instance, dispose this RFID reader and be for through use that the reference data that stores will receive from connect or not the difference of the RF signal intensity of the RFID label of connection traffic flow monitor be converted into the flow velocity value.
Best situation is, with a RFID label of connection traffic flow monitor not as a reference, can be with owing to the variation that coupling caused between label and the reader filters out.In addition, as before mention, the flow velocity pick-up unit is applied to the time length that variation and the 2nd RFID label of the resistance value that can make it in the design be placed under the particular flow rate flow velocity and forms relation one to one.The same, the application of the invention, 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.
Do not use the various RFID labels of two antennas also can perceive the variation of flow velocity with the flow velocity pick-up unit, the variation that the variation of perceived flux flow velocity is based on resonant frequency on the antenna also can recognize the variation that antenna receives signal.
For example pass through design to the antenna that links to each other with the flow velocity pick-up unit; The frequency that can make antenna is 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 instance; 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 influence of flow velocity; The resonant frequency of antenna is just reduced to 899.5-927.5MHZ; Frequency frequency range (902-928MHZ) at U.S. RFID is split into 52 channels, and 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 to prevent effectively that a plurality of readers from attempting 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 is carried out exchanging of information with regard to no longer allowing label with channel n.
In concrete instance; If the environment at label place has surpassed the flow velocity scope of expection; Reader can only send instruction to label through channel 1 to n-1; Label also can be made a response because the antenna in the label just can only work in this frequency range, when reader with the frequency of n channel when label sends instruction; So no longer reach the 928MHZ label and just no longer make a response because the variation of label flow velocity has caused the resonant frequency of label antenna to drop to 899.5-927.5MHZ, pass information back reader.
Favourable aspect is just to be reflected by the disappearance of this information interchange owing to variation that flow velocity has exceeded the operating frequency of antenna that predefined value causes.
In model; Reader can send an instruction between channel n-1 and channel n to label and further check that drift has taken place the operating frequency range of label antenna; Because label can receive the instruction that sends through channel n-1; And can be to the reader feedback information through channel n-1; Because label can not receive the instruction that sends through channel n, and can not can so just confirm that drift has taken place the operating frequency range of label antenna to the reader feedback information through channel n.
The variation of flow velocity causes the frequency of operation of label antenna to take place upwards to be not limited in downward drift and present invention frequency range on average is divided into n channel.
The embodiment of the invention can detect flow velocity at lower cost and change, 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 possibly 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 object oriented programming languages with a kind of high-caliber processing through programming.Each such function program for example possibly be stored in the storage intermediary in the ROM (read-only memory) to be read by a computer and processor and realize above-mentioned function.
Those skilled in the art can also recognize the various illustrative components, blocks (illustrative logical block) that the embodiment of the invention is listed, and unit and step can be passed 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 certain applications and total system through hardware or software.Those skilled in the art can be for every kind of certain applications, and can make ins all sorts of ways realizes described function, but this realization should not be understood that to exceed the scope of embodiment of the invention protection.
Various illustrative logical block described in the embodiment of the invention; 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 through the combination of calculation element, for example digital signal processor and microprocessor, a plurality of microprocessors, Digital Signal Processor Core of one or more microprocessors associatings, or any other similarly configuration realize.
The method described in the embodiment of the invention 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 read information from storage medium, 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 various parts in the user terminal.
In one or more exemplary designs, the described above-mentioned functions of the embodiment of the invention can realize in hardware, software, firmware or this three's combination in any.If in software, realize, these functions can be stored on the media with computer-readable, or are transmitted on the media of computer-readable with one or more instructions or code form.The computer-readable media comprises that the computer storage medium lets computer program transfer to other local telecommunication media from a place with being convenient to make.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 any can be used to carry or store with instruction or data structure and other can be read the media of the program code of form by general or special computer or general or special processor.In addition; Any connection can suitably be defined as the computer-readable media; For example, if software is through a concentric cable, optical fiber computer, twisted-pair feeder, Digital Subscriber Line (DSL) or also being comprised in the defined computer-readable media with wireless mode transmission such as for example infrared, wireless and microwaves 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 media.
Above-described embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely embodiment of the present invention; And be not used in qualification protection scope of the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. the rfid system of a measurement of discharge flow velocity; It is characterized in that; The rfid system of said measurement of discharge flow velocity comprises: RFID reader, a RFID label and the 2nd RFID label, and a said RFID label has identical chip and antenna with said the 2nd RFID label; A said RFID label is placed under certain flow velocity, and first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency; Said the 2nd RFID label has two pins for the RFID label of band flow velocity pick-up unit on the chip of said the 2nd RFID label; Two pins of said flow velocity pick-up unit and this link to each other; And form parallel-connection structure with the antenna of said the 2nd RFID label; On flow velocity pick-up unit and circuit that the chip of the 2nd RFID label is connected, one voltage-resistance conversion equipment is arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment; The variation of extraneous flow velocity can cause flow velocity pick-up unit voltage or change in current; This moment, said the 2nd RFID label was placed under certain flow velocity, and the characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency; A said RFID label and said the 2nd RFID label receive instruction and the feedback signal that said RFID reader sends respectively, and said RFID reader is through relatively detecting the change of flow velocity from the difference between the signal intensity of a said RFID label and said the 2nd RFID label different frequency.
2. the rfid system of measurement of discharge flow velocity according to claim 1; It is characterized in that the antenna of a said RFID label and said the 2nd RFID label is monopole antenna: the antenna of described flow velocity pick-up unit and said the 2nd RFID label forms parallel-connection structure.
3. the rfid system of measurement of discharge flow velocity according to claim 1; It is characterized in that; The antenna of a said RFID label and said the 2nd RFID label is double-doublet antenna: an antenna of described flow velocity pick-up unit and said the 2nd RFID label forms parallel-connection structure, perhaps forms parallel-connection structure simultaneously with two antennas.
4. the rfid system of measurement of discharge flow velocity according to claim 1; It is characterized in that; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET to, and said 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.
5. the rfid system of a measurement of discharge flow velocity; It is characterized in that; The rfid system of said measurement of discharge flow velocity comprises: RFID reader, a RFID label and the 2nd RFID label, and a said RFID label has identical chip and antenna with said the 2nd RFID label; A said RFID label is placed under certain flow velocity, and first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency; Said the 2nd RFID label has a pin for the RFID label of band flow velocity pick-up unit on the chip of said the 2nd RFID label; One end of said flow velocity pick-up unit links to each other with this pin; The other end is connected on the antenna of said RFID label; And form parallel-connection structure with antenna; On flow velocity pick-up unit and circuit that the chip of the 2nd RFID label is connected, one voltage-resistance conversion equipment is arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment, and the variation of extraneous flow velocity can cause flow velocity pick-up unit voltage or change in current, and this moment, said the 2nd RFID label was placed under certain flow velocity; The characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency; A said RFID label and said the 2nd RFID label receive instruction and the feedback signal that said RFID reader sends respectively, and said RFID reader is through relatively detecting the change of flow velocity from the difference between the signal intensity of a said RFID label and said the 2nd RFID label different frequency.
6. like the rfid system of the said measurement of discharge flow velocity of claim 5; It is characterized in that the antenna of a said RFID label and said the 2nd RFID label is monopole antenna: the antenna of described flow velocity pick-up unit and said the 2nd RFID label forms parallel-connection structure.
7. like the rfid system of the said measurement of discharge flow velocity of claim 5; It is characterized in that; The antenna of a said RFID label and said the 2nd RFID label is double-doublet antenna: an antenna of described flow velocity pick-up unit and said the 2nd RFID label forms parallel-connection structure, perhaps forms parallel-connection structure simultaneously with two antennas.
8. like the rfid system of the said measurement of discharge flow velocity of claim 5; It is characterized in that; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET to, and said 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.
9. the rfid system of a measurement of discharge flow velocity; It is characterized in that; The rfid system of said measurement of discharge flow velocity comprises: RFID reader, a RFID label and the 2nd RFID label, and a said RFID label has identical chip and antenna with said the 2nd RFID label; A said RFID label is placed under certain flow velocity, and first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency; Said the 2nd RFID label is the RFID label of band flow velocity pick-up unit; Said flow velocity pick-up unit is connected on the antenna of said RFID label; And form parallel-connection structure with antenna; On flow velocity pick-up unit and circuit that the chip of the 2nd RFID label is connected, one voltage-resistance conversion equipment is arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment, and the variation of extraneous flow velocity can cause flow velocity pick-up unit voltage or change in current, and this moment, said the 2nd RFID label was placed under certain flow velocity; The characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency; A said RFID label and said the 2nd RFID label receive instruction and the feedback signal that said RFID reader sends respectively, and said RFID reader is through relatively detecting the change of flow velocity from the difference between the signal intensity of a said RFID label and said the 2nd RFID label different frequency.
10. like the rfid system of the said measurement of discharge flow velocity of claim 9; It is characterized in that the antenna of a said RFID label and said the 2nd RFID label is monopole antenna: the antenna of described flow velocity pick-up unit and said the 2nd RFID label forms parallel-connection structure.
11. rfid system like the said measurement of discharge flow velocity of claim 9; It is characterized in that; The antenna of a said RFID label and said the 2nd RFID label is double-doublet antenna: an antenna of described flow velocity pick-up unit and said the 2nd RFID label forms parallel-connection structure, perhaps forms parallel-connection structure simultaneously with two antennas.
12. rfid system like the said measurement of discharge flow velocity of claim 9; It is characterized in that; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET to, and said 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.
13. the method for the rfid system measurement of discharge flow velocity of a measurement of discharge flow velocity; It is characterized in that; Said method is applied to the rfid system of each said measurement of discharge flow velocity among the claim 1-4; Or the rfid system of each said measurement of discharge flow velocity among the claim 5-8, or the rfid system of each said measurement of discharge flow velocity among the claim 9-12, comprising:
A said RFID label is placed under certain flow velocity, and first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency:
Said the 2nd RFID label is placed under certain flow velocity, and the characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency;
Send instruction through said RFID reader and give a said RFID label and said the 2nd RFID label and receiving feedback signals;
Difference when utilizing the work of more said RFID label of said RFID reader and said the 2nd RFID label between the signal intensity of different frequency detects the change of flow velocity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101834285A CN102750573A (en) | 2012-06-01 | 2012-06-01 | Radio frequency identification device (RFID) system for measuring flow volume and flow velocity and method for measuring flow volume and flow velocity of system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101834285A CN102750573A (en) | 2012-06-01 | 2012-06-01 | Radio frequency identification device (RFID) system for measuring flow volume and flow velocity and method for measuring flow volume and flow velocity of system |
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