CN102842015A - RFID (radio frequency identification) system for detecting degree of closeness and method for detecting distance between objects - Google Patents
RFID (radio frequency identification) system for detecting degree of closeness and method for detecting distance between objects Download PDFInfo
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- CN102842015A CN102842015A CN2012101834529A CN201210183452A CN102842015A CN 102842015 A CN102842015 A CN 102842015A CN 2012101834529 A CN2012101834529 A CN 2012101834529A CN 201210183452 A CN201210183452 A CN 201210183452A CN 102842015 A CN102842015 A CN 102842015A
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Abstract
The invention provides an RFID (radio frequency identification) system for detecting degree of closeness and a method for detecting a distance between objects. The system comprises an RFID reader, a first RFID tag and a second RFID tag, wherein the tags have same chips and antennas; the first RFID tag is arranged under the circumstance that the distance between the objects constantly changes, and works at a first resonant frequency; the second RFID tag is the RFID tag with a proximity sensitive device; the proximity sensitive device and the antenna of the second RFID tag form a parallel structure; a voltage-resistance converter is arranged on a circuit on which the proximity sensitive device is connected with the chip of the second RFID tag; the connected circuit and the voltage-resistance converter are part of the chip; the second RFID tag is arranged under the circumstance that the distance between the objects constantly changes and works at a second resonant frequency; and the first RFID tag and the second RFID tag respectively receive instructions transmitted by the RFID reader and feed back signals, and the RFID reader detects the change of the distance between the objects by comparing the difference between the signal strengths from different frequencies of the first RFID tag and the second RFID tag. The change of the distance between the objects can be detected at low cost.
Description
Technical field
The present invention relates to RFID (Radio Frequency Identification, RF identification) technical field, relate in particular between a kind of rfid system of surveying degree of closeness and object thereof apart from detection method.
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 degree of closeness that a kind of rfid system of surveying degree of closeness has been used to monitor product environment of living in has surpassed the acceptable degree of closeness.In general these equipment requirements induction installations will have a lasting energy source, are used for the change of distance between inspected object, 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, and distance changes between inspected object.
Summary of the invention
The embodiment of the invention provides between a kind of rfid system of surveying degree of closeness and object thereof apart from detection method, comes at lower cost that distance changes between inspected object.
On the one hand; The embodiment of the invention provides a kind of rfid system of surveying degree of closeness; The rfid system of said survey degree of closeness 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 the situation that distance constantly changes between object, 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 near the formula sensor on the chip of said the 2nd RFID label; Saidly link to each other near two pins of formula sensor and this; And form parallel-connection structure with the antenna of said the 2nd RFID label; Near on formula sensor and the circuit that the chip of the 2nd RFID label is connected one voltage-resistance conversion equipment is being arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment; The variation of extraneous degree of closeness can cause near formula sensor voltage or change in current; This moment, said the 2nd RFID label was placed under the situation that distance constantly changes between object, 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 coming the change of distance between inspected object 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: described antenna near formula sensor 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: a described antenna near formula sensor 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, saidly comprises near the formula sensor: inductance type near sensor and other current/voltage types near the formula sensor.
On the other hand; The embodiment of the invention provides a kind of rfid system of surveying degree of closeness; The rfid system of said survey degree of closeness 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 the situation that distance constantly changes between object, 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 near the formula sensor on the chip of said the 2nd RFID label; A said end near the formula sensor 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; Near on formula sensor and the circuit that the chip of the 2nd RFID label is connected one voltage-resistance conversion equipment is being arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment, and the variation of extraneous degree of closeness can cause that near formula sensor voltage or change in current this moment, said the 2nd RFID label was placed under the situation that distance constantly changes between object; 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 coming the change of distance between inspected object 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: described antenna near formula sensor 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: a described antenna near formula sensor 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, saidly comprises near the formula sensor: inductance type near sensor and other current/voltage types near the formula sensor.
Another aspect; The embodiment of the invention provides a kind of rfid system of surveying degree of closeness; The rfid system of said survey degree of closeness 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 the situation that distance constantly changes between object, 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 near the formula sensor; On the said antenna that is connected to said RFID label near the formula sensor; And form parallel-connection structure with antenna; Near on formula sensor and the circuit that the chip of the 2nd RFID label is connected one voltage-resistance conversion equipment is being arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment, and the variation of extraneous degree of closeness can cause that near formula sensor voltage or change in current this moment, said the 2nd RFID label was placed under the situation that distance constantly changes between object; 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 coming the change of distance between inspected object 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: described antenna near formula sensor 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: a described antenna near formula sensor 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, saidly comprises near the formula sensor: inductance type near sensor and other current/voltage types near the formula sensor.
Again on the one hand; The embodiment of the invention provides between a kind of rfid system object of surveying degree of closeness apart from detection method; Said method is applied to the rfid system of above-mentioned survey degree of closeness; Comprise: a said RFID label is placed under the situation that distance constantly changes between object; First resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged; This moment, a said RFID label was operated under first resonant frequency: said the 2nd RFID label is placed under the situation that distance constantly changes between object, 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 is come the change of distance between inspected object.
Technique scheme has following beneficial effect: because adopt the rfid system of said survey degree of closeness 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 the situation that distance constantly changes between object, and a said RFID label is operated under first resonant frequency; Said the 2nd RFID label is the RFID label of band near the formula sensor; Said antenna near formula sensor and said the 2nd RFID label forms parallel-connection structure; Near on formula sensor and the circuit that the chip of the 2nd RFID label is connected one voltage-resistance conversion equipment is being 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 the situation that distance constantly changes between object, 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 coming the technological means of the change of distance between inspected object from the difference between the signal intensity of a said RFID label and said the 2nd RFID label different frequency; So reached and come the technique effect that distance changes between inspected object at lower cost; And the energy that utilizes RFID to obtain, solved the powerup issue that degree of closeness 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 a kind of rfid system structural representation of surveying degree of closeness of the embodiment of the invention;
The synoptic diagram that Fig. 2 is connected with the 2nd RFID label chip near the formula sensor for the embodiment of the invention;
Fig. 3 is the equivalent circuit diagram of the embodiment of the invention the 2nd RFID label chip inside antenna;
The synoptic diagram that Fig. 4 is connected with the 2nd RFID label chip inside antenna equivalent electrical circuit near formula sensor, voltage-resistance conversion equipment for the embodiment of the invention;
The synoptic diagram that Fig. 5 directly is connected near formula sensor and RFID label antenna for the embodiment of the invention;
Fig. 6 is the structure key diagram of the embodiment of the invention near the formula sensor;
Fig. 7 be the embodiment of the invention based between the object of signal intensity apart from the detection method process flow diagram.
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; Survey the rfid system structural representation of degree of closeness for the embodiment of the invention is a kind of; The rfid system of said survey degree of closeness 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 the situation that distance constantly changes between object, 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 near the formula sensor; Said antenna near formula sensor and said the 2nd RFID label 3 forms parallel-connection structure; Near on formula sensor and the circuit that the chip of the 2nd RFID label is connected one voltage-resistance conversion equipment is being arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment; The variation of extraneous degree of closeness can cause near formula sensor voltage or change in current; This moment, said the 2nd RFID label was placed under the situation that distance constantly changes between object, 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 coming the change of distance between inspected object from the difference between the signal intensity of a said RFID label 2 and said the 2nd RFID label 3 different frequencies.There are three kinds of situation at least in linking to each other with the chip of the 2nd RFID label near the formula sensor of the embodiment of the invention:
The two pins structure:
The embodiment of the invention is a kind of rfid system that distance changes between inspected object that is used for.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; Link to each other near two pins of formula sensor and this; Form parallel-connection structure with antenna; Near on formula sensor and the circuit that the chip of the 2nd RFID label is connected one voltage-resistance conversion equipment is being arranged, the circuit of this connection is the part of chip with this voltage-resistance conversion equipment, and the variation of extraneous degree of closeness can cause near formula sensor voltage or change in current.This moment, said the 2nd RFID label was placed under the situation that distance constantly changes between object, 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 is come the change of distance between inspected object.
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, link to each other, form parallel-connection structure with antenna near two pins of formula sensor and this.Near on formula sensor and the circuit that the chip of the 2nd RFID label is connected one voltage-resistance conversion equipment is being arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment; The variation of extraneous degree of closeness can cause near formula sensor voltage or change in current; This moment, said the 2nd RFID label was placed under the situation that distance constantly changes between object, 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 is come the change of distance between inspected object.
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, saidly comprises near the formula sensor: inductance type near sensor and other current/voltage types near formula sensor 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; Link to each other near two pins of formula sensor and this; Form parallel-connection structure simultaneously with two antennas; Near on formula sensor and the circuit that the chip of the 2nd RFID label is connected one voltage-resistance conversion equipment is being arranged, the circuit of this connection is the part of chip with this voltage-resistance conversion equipment.The variation of extraneous degree of closeness can cause near formula sensor voltage or change in current.The situation that this and the 2nd RFID label only contain an antenna is similar.Be placed under the situation that distance constantly changes between object 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 is come the change of distance between inspected object.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, saidly comprises near the formula sensor: inductance type near sensor and other current/voltage types near formula sensor 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 a end near the formula sensor, directly links on the antenna near the other end of formula sensor.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.Near on formula sensor and the circuit that the chip of the 2nd RFID label is connected one voltage-resistance conversion equipment is being arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment, and the variation of extraneous degree of closeness can cause near formula sensor voltage or change in current.Be placed under the situation that distance constantly changes between object 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 is come the change of distance between inspected object.
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; Link to each other with this pin near the formula sensor; Directly link on the antenna near the formula sensor other end; Form parallel-connection structure with antenna, near on formula sensor and the circuit that the chip of the 2nd RFID label is connected one voltage-resistance conversion equipment is being arranged, the circuit of this connection and this voltage-resistance conversion equipment are the parts of chip.The variation of extraneous degree of closeness can cause near formula sensor voltage or change in current.Be placed under the situation that distance constantly changes between object 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 is come the change of distance between inspected object.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, saidly comprises near the formula sensor: inductance type near sensor and other current/voltage types near formula sensor 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 directly link on the antenna near the formula sensor.In this case, can not break away near the formula sensor with normal frequency for communication with the antenna that links to each other near the formula sensor.When being placed under the situation that distance constantly changes between object, 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 come the change of distance between inspected object 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; Directly link on the antenna near the formula sensor; Near on formula sensor and the circuit that the chip of the 2nd RFID label is connected one voltage-resistance conversion equipment is being arranged, the circuit of this connection is the part of chip with this voltage-resistance conversion equipment.The variation of extraneous degree of closeness can cause near formula sensor voltage or change in current.Be placed under the situation that distance constantly changes between object 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 when relatively a RFID label and second label are worked can inspected object between the change of distance.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, saidly comprises near the formula sensor: inductance type near sensor and other current/voltage types near formula sensor 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 morely near the formula sensor accordingly, simultaneously the model near the formula sensor can be the same or different.With regard to a kind of instantiation of device,, have at least a meeting to change with the characteristic frequency and the signal intensity of the antenna that links to each other near the formula sensor when being placed under the situation that distance constantly changes between object.The RFID reader can send instruction to label apparatus, comes the change of distance between inspected object from the difference between the signal intensity of the different frequency of antenna through comparison.
With regard to a kind of near with regard to the instantiation of formula sensor, the method for simultaneous comparison numerical value comprise with these relatively numerical value compare with most signal strength values.These signal strength values belong to different frequencies, and interrelate with the closeness value of majority, can detect the level of degree of closeness 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 degree of closeness.
Again on the one hand; The embodiment of the invention provides between a kind of rfid system object of surveying degree of closeness apart from detection method; Said method is applied to the rfid system of above-mentioned survey degree of closeness; Comprise: a said RFID label is placed under the situation that distance constantly changes between object; First resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged; This moment, a said RFID label was operated under first resonant frequency: said the 2nd RFID label is placed under the situation that distance constantly changes between object, 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 is come the change of distance between inspected object.
Synoptic diagram near the responsive label 10 of formula as shown in Figure 2, as to be connected with the 2nd RFID label chip near the formula sensor for the embodiment of the invention.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 with near formula sensor 14 link to each other, 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 above-mentioned mention near the formula sensor through two pins 16; 17 is continuous with antenna 11,12, when antenna 11; 12 are placed under the situation that distance constantly changes between object, can cause the variation of one or more transmitting terminal generation resonant frequencies near the formula sensor, thereby cause a different frequency.The frequency of the variation of this frequency and reception and transmission is all different.For example, be positioned between object under the situation that distance constantly changes, will cause sending frequency and accept that at least one changes in the frequency near the formula sensor.
In another example, the antenna frequencies value of setting at the beginning will be higher than the antenna frequencies under certain degree of closeness environment, and when reaching the situation degree of closeness that distance constantly changes between object, it will reduce then.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies of fixing, and it will rise when reaching the situation that distance constantly changes between object.Can be used for such having of the present invention near the formula sensor: inductance type near sensor and other current/voltage types near the formula sensor etc.
Based on different near the type of formula sensor, what cause changing possibly be that a specific closeness value also possibly be a scope of closeness value selectively one by one.The length of time must cause the variation of antenna resonance frequency, and antenna quality also can cause different variations.For example, the type near the formula sensor that 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 the situation operating distance that distance constantly changes between object, 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, for the embodiment of the invention near formula sensor, 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
3For with the equivalent resistance of connecting near the formula sensor, F is voltage-resistance conversion equipment.M is the variable resistor of representative near the formula sensor.This label is placed under the situation that distance constantly changes between object, 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, but the sketch of the passive RFID tags device 40 that changes for distance between embodiment of the invention inspected object.As shown in Figure 4, label apparatus 40 comprises 45, one integrated circuit 43 of a base and a double-doublet antenna 41,42.What link to each other with antenna 42 will influence the resistance of antenna 42 near formula sensor 44.Material near formula sensor 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 and above-mentioned linking to each other near the formula sensor of mentioning are when antenna 41; 42 are placed under the situation that distance constantly changes between object, can cause the variation of one or more transmitting terminal generation resonant frequencies near the formula sensor, thereby cause a different frequency.The frequency of the variation of this frequency and reception and transmission is all different.For example, be positioned between object under the situation that distance constantly changes, will cause sending frequency and accept that at least one changes in the frequency near the formula sensor.
In another example, the antenna frequencies value of setting at the beginning will be higher than the antenna frequencies under certain degree of closeness environment, and when reaching the situation degree of closeness that distance constantly changes between object, it will reduce then.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies of fixing, and it will rise when reaching the situation that distance constantly changes between object.Can be used for this such comprising of invention near the formula sensor: inductance type near sensor and other current/voltage types near the formula sensor etc.
Based on different near the type of formula sensor, what cause changing possibly be that a specific closeness value also possibly be a scope of closeness value selectively.The length of time must cause the variation of antenna resonance frequency, and antenna quality also can cause different variations.For example, the type near the formula sensor that has on the antenna can influence the length that changes the antenna resonance frequency required time.
As shown in Figure 6, for inductance type near sensor.Form by high-frequency oscillating circuits, detecting circuit, amplifying circuit, shaping circuit and output circuit.Make magnetic test coil with sensitive element during detection, it is an ingredient of pierce circuit, on the workplace of magnetic test coil, has an alternating magnetic field.When metal object during near magnetic test coil, metal object will produce eddy current and absorb oscillation energy, making vibration weaken so that stop and examining, and vibrates and stops shaking this two states and convert switching signal output to through testing circuit.
As shown in Figure 7, for the embodiment of the invention based between the object of signal intensity apart from the detection method process flow diagram, said method is applied to the rfid system of above-mentioned survey degree of closeness, comprising:
701, a said RFID label is placed under the situation that distance constantly changes between object, 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 the situation that distance constantly changes between object; 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 is come the change of distance between inspected object.
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 closeness value.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 from not with the signal strength values of a RFID label that links to each other near the formula sensor as a reference value, it with compare with the signal strength values of the 2nd RFID label that links to each other near the formula sensor.Through receive from link to each other near the formula sensor with not with a RFID label that links to each other near the formula sensor and the signal of the 2nd RFID label, the RFID reader can be collected the fiducial value of representing unlike signal intensity.Then, can be converted into label to such fiducial value residing for the RFID reader.With regard to a concrete instance, dispose this RFID reader and be in order to be converted into closeness value through the difference of using that the reference data that stores will receive from connecting or do not connect near the RF signal intensity of the RFID label of formula sensor.
Best situation is, with not connecting a RFID label near the formula sensor as a reference, and can be with owing to the variation that coupling caused between label and the reader filters out.In addition, as before mention, be 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 specific degree of closeness near the formula sensor and form 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 between object under the situation degree of closeness that distance constantly changes and this degree of closeness whether within the acceptable range.
Do not use the various RFID labels of two antennas also can be with the variation that perceives degree of closeness near the formula sensor, the variation that the variation of perception degree of closeness is based on resonant frequency on the antenna also can recognize the variation that antenna receives signal.
For example through to the design of the antenna that links to each other near the formula sensor; The frequency that can make antenna is at ISM (Industrial Scientific Medical; Industry, science, medical science) change in the frequency range, can connect this and the antenna that links to each other near formula sensor 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 degree of closeness environment; The resonant frequency of antenna is 902-928MHZ, but in a single day label is exposed in certain degree of closeness environment, because the influence of degree of closeness; 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).Since label antenna with link to each other near the formula sensor, so as long as degree of closeness 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 degree of closeness 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 degree of closeness 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 degree of closeness 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 degree of closeness 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 be come distance variation between inspected object at lower cost, and the energy that utilizes RFID to obtain, and has solved the powerup issue that degree of closeness 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. rfid system of surveying degree of closeness; It is characterized in that; The rfid system of said survey degree of closeness 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 the situation that distance constantly changes between object, 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 near the formula sensor on the chip of said the 2nd RFID label; Saidly link to each other near two pins of formula sensor and this; And form parallel-connection structure with the antenna of said the 2nd RFID label; Near on formula sensor and the circuit that the chip of the 2nd RFID label is connected one voltage-resistance conversion equipment is being arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment; The variation of extraneous degree of closeness can cause near formula sensor voltage or change in current; This moment, said the 2nd RFID label was placed under the situation that distance constantly changes between object, 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 coming the change of distance between inspected object from the difference between the signal intensity of a said RFID label and said the 2nd RFID label different frequency.
2. survey the rfid system of degree of closeness 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: described antenna near formula sensor and said the 2nd RFID label forms parallel-connection structure.
3. survey the rfid system of degree of closeness 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: a described antenna near formula sensor and said the 2nd RFID label forms parallel-connection structure, perhaps forms parallel-connection structure simultaneously with two antennas.
4. survey the rfid system of degree of closeness 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, saidly comprises near the formula sensor: inductance type near sensor and other current/voltage types near the formula sensor.
5. rfid system of surveying degree of closeness; It is characterized in that; The rfid system of said survey degree of closeness 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 the situation that distance constantly changes between object, 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 near the formula sensor on the chip of said the 2nd RFID label; A said end near the formula sensor 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; Near on formula sensor and the circuit that the chip of the 2nd RFID label is connected one voltage-resistance conversion equipment is being arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment, and the variation of extraneous degree of closeness can cause that near formula sensor voltage or change in current this moment, said the 2nd RFID label was placed under the situation that distance constantly changes between object; 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 coming the change of distance between inspected object 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 survey degree of closeness of claim 5; It is characterized in that the antenna of a said RFID label and said the 2nd RFID label is monopole antenna: described antenna near formula sensor and said the 2nd RFID label forms parallel-connection structure.
7. like the rfid system of the said survey degree of closeness 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: a described antenna near formula sensor 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 survey degree of closeness 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, saidly comprises near the formula sensor: inductance type near sensor and other current/voltage types near the formula sensor.
9. rfid system of surveying degree of closeness; It is characterized in that; The rfid system of said survey degree of closeness 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 the situation that distance constantly changes between object, 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 near the formula sensor; On the said antenna that is connected to said RFID label near the formula sensor; And form parallel-connection structure with antenna; Near on formula sensor and the circuit that the chip of the 2nd RFID label is connected one voltage-resistance conversion equipment is being arranged; The circuit of this connection is the part of chip with this voltage-resistance conversion equipment, and the variation of extraneous degree of closeness can cause that near formula sensor voltage or change in current this moment, said the 2nd RFID label was placed under the situation that distance constantly changes between object; 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 coming the change of distance between inspected object 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 survey degree of closeness of claim 9; It is characterized in that the antenna of a said RFID label and said the 2nd RFID label is monopole antenna: described antenna near formula sensor and said the 2nd RFID label forms parallel-connection structure.
11. rfid system like the said survey degree of closeness 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: a described antenna near formula sensor 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 survey degree of closeness 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, saidly comprises near the formula sensor: inductance type near sensor and other current/voltage types near the formula sensor.
13. between a rfid system object of surveying degree of closeness apart from detection method; It is characterized in that; Said method is applied to the rfid system of each said survey degree of closeness among the claim 1-4; Or the rfid system of each said survey degree of closeness among the claim 5-8, or the rfid system of each said survey degree of closeness among the claim 9-12, comprising:
A said RFID label is placed under the situation that distance constantly changes between object, 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 the situation that distance constantly changes between object, 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 is come the change of distance between inspected object.
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| CN2012101834529A CN102842015A (en) | 2012-06-01 | 2012-06-01 | RFID (radio frequency identification) system for detecting degree of closeness and method for detecting distance between objects |
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Application publication date: 20121226 |