CN102750577A - RFID (Radio Frequency Identification Devices) label with proximity sensor, RFID system and method for detecting distance between objects - Google Patents
RFID (Radio Frequency Identification Devices) label with proximity sensor, RFID system and method for detecting distance between objects Download PDFInfo
- Publication number
- CN102750577A CN102750577A CN2012101836539A CN201210183653A CN102750577A CN 102750577 A CN102750577 A CN 102750577A CN 2012101836539 A CN2012101836539 A CN 2012101836539A CN 201210183653 A CN201210183653 A CN 201210183653A CN 102750577 A CN102750577 A CN 102750577A
- Authority
- CN
- China
- Prior art keywords
- antenna
- formula sensor
- rfid label
- rfid
- distance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention provides an RFID (Radio Frequency Identification Devices) label with a proximity sensor, an RFID system and a method for detecting a distance between objects. Two pins are arranged on a chip of the RFID label; the proximity sensor and an antenna of the RFID label form a parallel-connection structure; a logic circuit for controlling on and off is arranged on a line, on which the proximity sensor and the chip of the RFID label are connected; the connected line and the logic circuit for controlling the on and the off are parts of the chip; when the logic circuit is off, the proximity sensor is not connected with the antenna in parallel, and is placed under the condition that the distance between the objects is changed continuously, and a first resonant frequency and signal strength of the antenna are kept unchanged; when the logic circuit is on, the proximity sensor is connected with the antenna in parallel, and is placed under the condition that the distance between the objects is changed continuously, and at this time, the antenna works under a second resonant frequency; and the RFID label receives a command sent from an RFID reader so as to control the on and the off of the logic circuit, so that the change of the distance between the objects can be detected through comparing difference between signal strengths of different frequencies of the antenna. According to the invention, the change of the distance between the objects can be detected with lower cost.
Description
Technical field
The present invention relates to RFID (Radio Frequency Identification, RF identification) technical field, relate in particular to a kind of band near between RFID label, rfid system and the object of formula sensor 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, and can be attached on the object, and it comprises the microchip that an ability and antenna carry out information interchange.This microchip is an integrated circuit in general, and it can be used for storing and process information, the modulation 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, have when distance has surpassed distance between the acceptable object between the object that rfid system near the formula sensor has been used to monitor product environment of living in.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 provide a kind of band near between RFID label, rfid system and the object of formula sensor apart from detection method, come between inspected object distance to change at lower cost.
On the one hand, the embodiment of the invention provides the RFID label of a kind of band near the formula sensor, and two pins are arranged on the chip of said 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 RFID label; The variation of distance can cause near the changes in resistance of formula sensor own between external object; Said near the logical circuit that a control break-make is arranged on formula sensor and the circuit that the chip of RFID label is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make, the break-make of logical circuit determined near the formula sensor whether with the sky line parallel: when logical circuit breaks off, near the formula sensor not with the sky line parallel; Be placed under the situation that distance constantly changes between object this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, near a formula sensor and a day line parallel, be placed under the situation that distance constantly changes between object this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of distance between inspected object.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a monopole antenna.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a double-doublet antenna: saidly form parallel-connection structure near formula sensor and antenna wherein; Perhaps saidly form parallel-connection structure simultaneously near formula sensor and two antennas.
Optional, in an embodiment of the present invention, said near the formula sensor be resistor-type near the formula sensor, saidly comprise near the formula sensor: condenser type near sensor and other resistor-types near sensor.
On the other hand, the embodiment of the invention provides the RFID label of a kind of band near the formula sensor, and a pin is arranged on the chip of said 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; The variation of distance can cause near the changes in resistance of formula sensor own between external object, and near the logical circuit that a control break-make is arranged on formula sensor and the circuit that the chip of RFID label is connected, the circuit of this connection is the part of chip with the logical circuit of control break-make said; The break-make of logical circuit determined near the formula sensor whether with the sky line parallel: when logical circuit breaks off; Near the formula sensor not with the sky line parallel, be placed between object this moment under the situation that distance constantly changes, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, near a formula sensor and a day line parallel, be placed under the situation that distance constantly changes between object this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of distance between inspected object.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a monopole antenna.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a double-doublet antenna: saidly form parallel-connection structure near formula sensor and antenna wherein; Perhaps saidly form parallel-connection structure simultaneously near formula sensor and two antennas.
Optional, in an embodiment of the present invention, said near the formula sensor be resistor-type near the formula sensor, said resistor-type comprises near the formula sensor: condenser type near sensor and other resistor-types near sensor.
Another aspect; The embodiment of the invention provides the RFID label of a kind 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, the variation of distance can cause near the changes in resistance of formula sensor own between external object; Said near the logical circuit that a control break-make is arranged on formula sensor and the circuit that antenna is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make, the break-make of logical circuit determined near the formula sensor whether with the sky line parallel: when logical circuit breaks off, near the formula sensor not with the sky line parallel; Be placed under the situation that distance constantly changes between object this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, near a formula sensor and a day line parallel, be placed under the situation that distance constantly changes between object this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of distance between inspected object.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a monopole antenna.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a double-doublet antenna: saidly form parallel-connection structure near formula sensor and antenna wherein; Perhaps saidly form parallel-connection structure simultaneously near formula sensor and two antennas.
Optional, in an embodiment of the present invention, said near the formula sensor be resistor-type near the formula sensor, said resistor-type comprises near the formula sensor: condenser type near sensor and other resistor-types near sensor.
On the one hand, the embodiment of the invention provides the rfid system of a kind of band near the formula sensor again, and said rfid system comprises RFID label and RFID reader, and said RFID label comprises the RFID label of above-mentioned band near the formula sensor; Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby comes the change of distance between inspected object from the difference between the signal intensity of the different frequency of antenna through comparison.
Again on the one hand; The embodiment of the invention provide a kind of band near between the object of the rfid system of formula sensor apart from detection method; Be applied to the rfid system of above-mentioned band apart from detection method between said object, comprise: send the break-make of instruction with the logical circuit of control RFID label through said RFID reader near the formula sensor; Receive the break-make of the instruction of RFID reader transmission through the RFID label: when logical circuit breaks off with control logic circuit; Near the formula sensor not with the sky line parallel; Be placed under the situation that distance constantly changes between object this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, near a formula sensor and a day line parallel, be placed under the situation that distance constantly changes between object this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Utilize the comparison of said RFID reader to come the change of distance between inspected object from the difference between the signal intensity of the different frequency of antenna.
Technique scheme has following beneficial effect: because on the chip of employing RFID label two pins are arranged; Antenna near formula sensor and RFID label forms parallel-connection structure; Near the logical circuit that a control break-make is arranged on formula sensor and the circuit that the chip of RFID label is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make: when logical circuit breaks off; Near the formula sensor not with the sky line parallel, be placed between object this moment under the situation that distance constantly changes, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected, near a formula sensor and a day line parallel, be placed on this moment under the situation that distance constantly changes between object, this moment, antenna was operated under second resonant frequency; The RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit; Thereby realize coming from the difference between the signal intensity of the different frequency of antenna the technological means of the change of distance between inspected object through comparison; 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 distance detects between object.
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.
The synoptic diagram that Fig. 1 is connected with the RFID label chip near the formula sensor for the embodiment of the invention;
Fig. 2 is the equivalent circuit diagram of RFID label chip inside antenna;
The synoptic diagram that Fig. 3 is connected with RFID label chip inside antenna equivalent electrical circuit near formula sensor, logic switch for the embodiment of the invention;
The synoptic diagram that Fig. 4 directly is connected near formula sensor and RFID label antenna for the embodiment of the invention;
Fig. 5 is the structure key diagram of the embodiment of the invention near the formula sensor;
Fig. 6 is the process flow diagram of the embodiment of the invention based on the dried up flat detection method of object spacing 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.
There are three kinds of situation at least in linking to each other with the chip of 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 device, system and technology that distance changes between inspected object that be used for.This system has comprised a RFID label, and two pins are arranged on the chip of this RFID label.Link to each other near two pins of formula sensor and this, form parallel-connection structure with antenna.The variation of distance can cause near the changes in resistance of formula sensor own between external object.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the circuit of this connection is the part of chip with the logical circuit of control break-make.
The break-make of logical circuit determined near the formula sensor whether with the sky line parallel.When logical circuit breaks off, near the formula sensor not with the sky line parallel, be placed between object this moment under the situation that distance constantly changes, first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit was connected, near a formula sensor and a day line parallel, be placed under the situation that distance constantly changes between object this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency.The RFID reader can send the break-make of instruction control logical circuit to label, when logical circuit is connected, can come the change of distance between inspected object through comparison from the difference between the signal intensity of the different frequency of antenna.
With regard to an instance, this system has comprised a RFID label, has only an antenna on this label.Two pins are arranged on the chip of this label.Link to each other near two pins of formula sensor and this, form parallel-connection structure with this root antenna.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of distance can cause near the changes in resistance of formula sensor own between external object.
When logical circuit is connected, be placed under the situation that distance constantly changes between object, the characteristic frequency of antenna 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, and the difference between the signal intensity of the different frequency during through the comparison logic break-make can inspected object between the change of distance.Or rather, should have lower resistance near the formula sensor, its instantiation comprises: condenser type near sensor and other resistor-types near sensor etc.
With regard to another instance, this system has comprised a RFID label, and two antennas are arranged on this label.Two kinds of situation are arranged this moment.First kind of situation is to link to each other near two pins of formula sensor and this, forms parallel-connection structure with first antenna.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of distance can cause near the changes in resistance of formula sensor own between external object.And second antenna is all the time with the first resonant frequency proper communication.
When logical circuit is connected, be placed under the situation that distance constantly changes between object, the characteristic frequency of first antenna and signal intensity have at least a meeting to change, and it is operated under second resonant frequency.The RFID reader can send instruction to label, and when connecting through comparison logic the difference between the signal intensity of the different frequency of first and second antennas can inspected object between the change of distance.Difference between the signal intensity of the different frequency during logical circuit break-make through second antenna self relatively also can inspected object between the change of distance.
Second kind of situation be, links to each other near two pins of formula sensor and this, forms parallel-connection structure simultaneously with two antennas.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of distance can cause near the changes in resistance of formula sensor own between external object.The situation that this and label only contain an antenna is similar.
When logical circuit is connected, be placed under the situation that distance constantly changes between object, antenna features frequency and signal intensity have one at least and change, and it is 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 the comparison logic break-make can inspected object between the change of distance.First kind of situation circuit connection is fairly simple, and the resonant frequency of two antennas maybe be different during work, can influence the precision of measurement.Second kind of situation circuit connects more complicated, but the resonant frequency of two antennas is consistent during work, and measuring accuracy is higher.Or rather, should have lower resistance near the formula sensor, its instantiation comprises: condenser type near sensor and other resistor-types near sensor etc.
One pin configuration:
The chip of this label can only have a pin, and 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.Simultaneously on pin and circuit that the chip internal circuit is connected, a logical circuit of controlling break-make is arranged.
When logical circuit breaks off, near the formula sensor not with the sky line parallel, be placed between object this moment under the situation that distance constantly changes, first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit was connected, near a formula sensor and a day line parallel, be placed under the situation that distance constantly changes between object this moment, and antenna features frequency and signal intensity have one at least and change, and it is operated under second resonant frequency.The RFID reader can send the break-make of instruction control logical circuit to label, when logical circuit is connected, can come the change of distance between inspected object through comparison from the difference between the signal intensity of the different frequency of antenna.
With regard to an instance, this system has comprised a RFID label, has only an antenna on this label.A pin is arranged on the chip of this label.Link to each other with this pin near the formula sensor, directly link on the antenna, form parallel-connection structure with antenna near the formula sensor other end.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of distance can cause near the changes in resistance of formula sensor own between external object.
When logical circuit is connected, be placed under the situation that distance constantly changes between object, antenna is operated under second resonant frequency, and its characteristic frequency and signal intensity have one at least and change.The RFID reader can send instruction to label, and the difference between the signal intensity of the different frequency during through the comparison logic break-make can inspected object between the change of distance.Or rather, should have lower resistance near the formula sensor, its instantiation comprises: condenser type near sensor and other resistor-types near sensor etc.
With regard to another instance, this system has comprised a RFID label, and two antennas are arranged on this label.A pin is arranged on the chip of this label.Link to each other with this pin near the formula sensor, directly link on the antenna, form parallel-connection structure with first antenna near the formula sensor other end.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of distance can cause near the changes in resistance of formula sensor own between external object.And second antenna is all the time with the first resonant frequency communication.
When logical circuit is connected, be placed under the situation that distance constantly changes between object, first antenna is operated under second resonant frequency, and its characteristic frequency and signal intensity have at least a meeting to change.The RFID reader can send instruction to label, and when connecting through comparison logic the difference between the signal intensity of the different frequency of first and second antennas can inspected object between the change of distance.Difference between the signal intensity of the different frequency during logical circuit break-make through first antenna self relatively also can inspected object between the change of distance.Or rather, should have lower resistance near the formula sensor, its instantiation comprises: condenser type near sensor and other resistor-types near sensor etc.
No pin configuration:
When not having pin on the chip of RFID label, can 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, 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 an instance, this system has comprised a RFID label, and two antennas are arranged on this label.Directly link to each other near the formula sensor with first antenna, and second antenna not with link to each other near the formula sensor all the time with the first resonant frequency proper communication.When being placed under the situation that distance constantly changes between object, first antenna is operated under second resonant frequency, and its characteristic frequency and signal intensity have at least a meeting to change, and the characteristic frequency of second antenna and signal intensity are constant.The RFID reader can send instruction to label, and the difference between the signal intensity of the different frequency through first and second antennas of comparison can inspected object between the change of distance.Or rather, should have lower resistance near the formula sensor, its instantiation comprises: condenser type near sensor and other resistor-types near 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 and the object of majority between distance value interrelate, simultaneously based on the above-mentioned comparison of mentioning can inspected object between the level of distance.
Yet with regard to another aspect, a rfid system comprises a RFID label apparatus and a RFID reader device.This RFID label apparatus is used to send two kinds of signals, the signal when signal when promptly above-mentioned logical circuit breaks off and logical circuit are connected, and these two kinds of signals have at least a kind of meeting that the request that receives is responded.The RFID reader device is used for the RFID label apparatus is sent a request at least.Fiducial value between the signal strength values when reading device being installed being signal strength values and logical circuit in order accepting to connect and to break off from the logical circuit of label, and be converted into these fiducial values the varying level of distance between object.
In an example, the antenna of RFID label with link to each other near the formula sensor, on this connection line, have one control break-make logical circuit.Under logical circuit break-make whether two kinds of situation, have two kinds of corresponding with it different frequencies with antenna.Connect and be placed on this label apparatus under the situation that distance constantly changes between object when logical circuit,, will produce the intensity level of two kinds of unlike signals owing to the variation of resonant frequency.
In an example, the RFID label apparatus comprises first, second two antennas, and wherein first antenna launched first signal, and second antenna emission secondary signal.Better situation is, first antenna with link to each other near the formula sensor, when this label apparatus is placed under the situation that distance constantly changes between object,, will produce the different of secondary signal intensity level and first signal strength values owing to the variation of resonant frequency.
On the one hand, the embodiment of the invention provides the rfid system of a kind of band near the formula sensor again, and said rfid system comprises RFID label and RFID reader, and said RFID label comprises the RFID label of above-mentioned band near the formula sensor; Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby comes the change of distance between inspected object from the difference between the signal intensity of the different frequency of antenna through comparison.
Again on the one hand; The embodiment of the invention provide a kind of band near between the object of the rfid system of formula sensor apart from detection method; Be applied to the rfid system of above-mentioned band apart from detection method between said object, comprise: send the break-make of instruction with the logical circuit of control RFID label through said RFID reader near the formula sensor; Receive the break-make of the instruction of RFID reader transmission through the RFID label: when logical circuit breaks off with control logic circuit; Near the formula sensor not with the sky line parallel; Be placed under the situation that distance constantly changes between object this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, near a formula sensor and a day line parallel, be placed under the situation that distance constantly changes between object this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Utilize the comparison of said RFID reader to come the change of distance between inspected object from the difference between the signal intensity of the different frequency of antenna.
As shown in Figure 1, be the synoptic diagram of the embodiment of the invention near the label 10 of distance between formula sensor and sense object that the RFID label chip is connected.Among Fig. 1, label apparatus 10 comprises 13, two pins 16,17 of 15, one surface-mounted integrated circuits of a base and a double-doublet antenna 11,12.Two pins 16,17 are arranged on the surface-mounted integrated circuit 13, and these two pins outwards 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, and the logical circuit of a control break-make is arranged on the circuit that connects.Can control near the responsive module of formula through the break-make of logical circuit and whether to be inserted in the chip circuit, thereby can influence the frequency of the antenna that links to each other with radio-frequency module.When logical circuit broke off, label antenna was with the first resonant frequency communication.When logical circuit is connected, be placed under the situation that distance constantly changes between object, antenna is operated under second resonant frequency, and its characteristic frequency and signal frequency and signal intensity have one at least and change.
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 and above-mentioned linking to each other with antenna 11,12 through two pins 16,17 of mentioning near the formula sensor; When antenna 11,12 is 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.The frequency of the frequency of this variation and reception and transmission is all different.For example, be placed between object under the situation that distance constantly changes, will cause transmission 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 between certain object apart from the antenna frequencies under the environment, then when reach between certain object apart from the time, it will reduce.In another example, the antenna frequencies of setting at the beginning is lower than the dried up antenna frequencies under flat of certain object spacing, and dried up it will rise at ordinary times when reaching certain object spacing.Can be used for such having of the present invention near the formula sensor: condenser type near sensor and other resistor-types near sensor etc.
Type based near the formula sensor is different, and dried up the putting down of object spacing that causes changing possibly be that distance value also possibly be a scope of distance value between object selectively between a specific object.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 2, be the equivalent circuit diagram of 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 Figure 2, 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 3, be the logical circuit synoptic diagram that with RFID label antenna equivalent electrical circuit be connected of the embodiment of the invention near formula sensor, control break-make.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.M is the variable resistor of representative near the formula sensor, and S is the logical circuit of control break-make.When logical circuit breaks off, near the formula sensor not with the sky line parallel, be placed between object this moment under the situation that distance constantly changes, first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit was connected, near a formula sensor and a day line parallel, be placed under the situation that distance constantly changes between object this moment, and antenna is operated under second resonant frequency, and its characteristic frequency and signal intensity have one at least and change.
As shown in Figure 4, 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 placed between object under the situation that distance constantly changes, will cause transmission 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 between certain object apart from the antenna frequencies under the environment, then when reach between certain object apart from the time, it will reduce.In another example, the antenna frequencies of setting at the beginning is lower than the dried up antenna frequencies under flat of certain object spacing, and dried up it will rise at ordinary times when reaching certain object spacing.Can be used for this such having of invention near the formula sensor: condenser type near sensor and other resistor-types near sensor etc.
Type based near the formula sensor is different, and dried up the putting down of object spacing that causes changing possibly be that distance value also possibly be a scope of distance value between object selectively between a specific object.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 5, near the formula sensor construction, a kind of device with perceptual object degree of closeness.51,52 is electrode, it utilize displacement transducer to approaching object have special sensitivity characteristic, reach recognition object near state and export the switching value signal.Capacitive proximity sensor: have certain electric capacity at ordinary times between detecting electrode and the earth, it becomes an ingredient of oscillatory circuit.When object to be detected during near detecting electrode, because detecting electrode is added with voltage, inspected object will receive electrostatic induction and produce polarization phenomena; Testee is the closer to detecting electrode, and the electric charge on the detecting electrode is just many more, because the electrostatic capacitance of detecting electrode; Therefore electric charge increases; Electric capacity is increased thereupon, from and the concussion of oscillating circuit is weakened, even stop the concussion.
As shown in Figure 6, for the embodiment of the invention is come a kind of method flow diagram that distance changes between inspected object through the label apparatus that uses many antennas.What need consider is, the above-mentioned device of mentioning uses a label integrated circuit to carry out and the exchanging of a plurality of antennas.
As shown in Figure 6,50, the RFID reader sends energy and instruction to label apparatus.52, logical circuit is in the state of disconnection at initial time, label apparatus with not with the antenna received energy and the instruction that link to each other near the formula sensor.54, the electromagnetic wave that label apparatus will carry energy is converted into a DC (direct current) voltage, thereby just can make label carry out the requirement of indication.And this conversion need be used a charge pump, and a rectification circuit perhaps interconnects it, perhaps will use other energy conversion device.56, label apparatus is not through sending signal with the sky alignment reader that links to each other near the formula sensor.58, the energy intensity of receiving signal is measured and write down to reader.60, reader sends the instruction of connecting logical circuit to label apparatus.62, label apparatus is used and the antenna transmission data that link to each other near the formula sensor.64, the energy intensity of signal is received in the reader measurement.66, reader calculated goes out the fiducial value of a reaction signal intensity.68, reader changes into distance value between different objects with fiducial 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, reader will from not with the signal strength values of the antenna that links to each other near the formula sensor as a reference value, it with compare with the signal strength values of the label antenna that links to each other near the formula sensor.Through receive from link to each other near the formula sensor with not with the signal of the transmitting terminal that links to each other near the formula sensor, reader can be collected the fiducial value of representing unlike signal intensity.Then, can be converted into the residing object spacing of label to such fiducial value dried up flat for the RFID reader.With regard to a concrete instance, dispose this RFID reader and be in order to be converted into distance value between object 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 antenna of formula sensor.
Best situation is, with not connecting antenna 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, variation and the label that is applied to the resistance value that can make it in the design near the formula sensor is placed between certain objects distance time length down and forms one to one and concern.For example; To only on an antenna, position near the formula sensor; Can allow like this to change within the specific limits as a kind of function from the signal of RFID label apparatus, and this function just antenna be placed between certain object the function that just has after the time under the distance.The same, the application of the invention, under the passive condition of RFID label, whether the RFID reader can detect label apparatus and be placed between object under the situation that distance constantly changes and within the acceptable range whether distance between this object.
The various RFID labels that do not use two antennas also can be with the variation that perceives distance between object near the formula sensor, and the variation that the variation of distance is based on resonant frequency on the antenna between perceptual object 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 (IndustrialScientific 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 between certain object apart from environment; The resonant frequency of antenna is 902-928MHZ, but in a single day label is exposed between certain object apart from the environment, because the influence of distance between object; 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 between object apart from having 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 (8995-9275MHZ) 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 between the object of expecting apart from scope; 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 because the variation of distance has caused the resonant frequency of label antenna to drop to 8995-927.5MHZ no longer reaching the 928MHZ label and just no longer make a response, pass information back reader between the label object.
Favourable aspect is just to be reflected by the disappearance of this information interchange owing to variation that distance between object 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 distance 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 between object.
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 distance detects between object.
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 (illustrativelogical 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 (illustrativecomponents), 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 (14)
1. a band is characterized in that near the RFID label of formula sensor two pins are arranged on the chip of said 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 RFID label; The variation of distance can cause near the changes in resistance of formula sensor own between external object; Said near the logical circuit that a control break-make is arranged on formula sensor and the circuit that the chip of RFID label is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make, the break-make of logical circuit determined near the formula sensor whether with the sky line parallel: when logical circuit breaks off, near the formula sensor not with the sky line parallel; Be placed under the situation that distance constantly changes between object this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, near a formula sensor and a day line parallel, be placed under the situation that distance constantly changes between object this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of distance between inspected object.
2. according to claim 1 with RFID label, it is characterized in that the antenna of said RFID label is a monopole antenna near the formula sensor.
3. according to claim 1 with RFID label, it is characterized in that the antenna of said RFID label is a double-doublet antenna: saidly form parallel-connection structure near formula sensor and antenna wherein near the formula sensor; Perhaps saidly form parallel-connection structure simultaneously near formula sensor and two antennas.
4. according to claim 1 with RFID label near the formula sensor; It is characterized in that; Said near the formula sensor be resistor-type near the formula sensor, said resistor-type comprises near the formula sensor: condenser type near sensor and other resistor-types near sensor.
5. a band is characterized in that near the RFID label of formula sensor a pin is arranged on the chip of said 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; The variation of distance can cause near the changes in resistance of formula sensor own between external object, and near the logical circuit that a control break-make is arranged on formula sensor and the circuit that the chip of RFID label is connected, the circuit of this connection is the part of chip with the logical circuit of control break-make said; The break-make of logical circuit determined near the formula sensor whether with the sky line parallel: when logical circuit breaks off; Near the formula sensor not with the sky line parallel, be placed between object this moment under the situation that distance constantly changes, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, near a formula sensor and a day line parallel, be placed under the situation that distance constantly changes between object this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of distance between inspected object.
6. like the RFID label of the said band of claim 5, it is characterized in that the antenna of said RFID label is a monopole antenna near the formula sensor.
7. like the RFID label of the said band of claim 5, it is characterized in that the antenna of said RFID label is a double-doublet antenna: saidly form parallel-connection structure near formula sensor and antenna wherein near the formula sensor; Perhaps saidly form parallel-connection structure simultaneously near formula sensor and two antennas.
8. like the RFID label of the said band of claim 5 near the formula sensor; It is characterized in that; Said near the formula sensor be resistor-type near the formula sensor, said resistor-type comprises near the formula sensor: condenser type near sensor and other resistor-types near sensor.
9. a band is near the RFID label of formula sensor; It is characterized in that; On the said antenna that is connected to said RFID label near the formula sensor, and form parallel-connection structure with antenna, the variation of distance can cause near the changes in resistance of formula sensor own between external object; Said near the logical circuit that a control break-make is arranged on formula sensor and the circuit that antenna is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make, the break-make of logical circuit determined near the formula sensor whether with the sky line parallel: when logical circuit breaks off, near the formula sensor not with the sky line parallel; Be placed under the situation that distance constantly changes between object this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, near a formula sensor and a day line parallel, be placed under the situation that distance constantly changes between object this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of distance between inspected object.
10. like the RFID label of the said band of claim 9, it is characterized in that the antenna of said RFID label is a monopole antenna near the formula sensor.
11., it is characterized in that the antenna of said RFID label is a double-doublet antenna like the RFID label of the said band of claim 9: saidly form parallel-connection structure near formula sensor and antenna wherein near the formula sensor; Perhaps saidly form parallel-connection structure simultaneously near formula sensor and two antennas.
12. like the RFID label of the said band of claim 9 near the formula sensor; It is characterized in that; Said near the formula sensor be resistor-type near the formula sensor, said resistor-type comprises near the formula sensor: condenser type near sensor and other resistor-types near sensor.
13. a band is near the rfid system of formula sensor, said rfid system comprises RFID label and RFID reader, it is characterized in that,
Said RFID label comprises that each said band is near the RFID label of formula sensor among the claim 1-4; Or among the claim 5-8 each said band near the RFID label of formula sensor, or among the claim 9-12 each said band near the RFID label of formula sensor;
Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby comes the change of distance between inspected object from the difference between the signal intensity of the different frequency of antenna through comparison.
14. a band near between the object of the rfid system of formula sensor apart from detection method, it is characterized in that, be applied to the rfid system of the said band of claim 13 apart from detection method between said object near the formula sensor, comprising:
Send the break-make of instruction through said RFID reader with the logical circuit of control RFID label;
Receive the break-make of the instruction of RFID reader transmission through the RFID label: when logical circuit breaks off with control logic circuit; Near the formula sensor not with the sky line parallel; Be placed under the situation that distance constantly changes between object this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, near a formula sensor and a day line parallel, be placed under the situation that distance constantly changes between object this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency;
Utilize the comparison of said RFID reader to come the change of distance between inspected object from the difference between the signal intensity of the different frequency of antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101836539A CN102750577A (en) | 2012-06-01 | 2012-06-01 | RFID (Radio Frequency Identification Devices) label with proximity sensor, RFID system and method for detecting distance between objects |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101836539A CN102750577A (en) | 2012-06-01 | 2012-06-01 | RFID (Radio Frequency Identification Devices) label with proximity sensor, RFID system and method for detecting distance between objects |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102750577A true CN102750577A (en) | 2012-10-24 |
Family
ID=47030737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101836539A Pending CN102750577A (en) | 2012-06-01 | 2012-06-01 | RFID (Radio Frequency Identification Devices) label with proximity sensor, RFID system and method for detecting distance between objects |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102750577A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103246349A (en) * | 2013-04-03 | 2013-08-14 | 汕头大学 | Input method of wearable finer-sensing wireless communication, and input device using input method |
| CN110478917A (en) * | 2014-05-21 | 2019-11-22 | 环球城市电影有限责任公司 | For tracking system and method used in investigation amusement park equipment |
| CN111450541A (en) * | 2014-05-21 | 2020-07-28 | 环球城市电影有限责任公司 | Automated optical tracking system for amusement park components |
| CN111854597A (en) * | 2020-05-29 | 2020-10-30 | 北京慧宸信博科技有限公司 | Method, device and system for detecting relative rotation between components |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100079288A1 (en) * | 2008-09-30 | 2010-04-01 | Timothy Collins | RFID Tag Device with Temperature Sensitive Antenna |
-
2012
- 2012-06-01 CN CN2012101836539A patent/CN102750577A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100079288A1 (en) * | 2008-09-30 | 2010-04-01 | Timothy Collins | RFID Tag Device with Temperature Sensitive Antenna |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103246349A (en) * | 2013-04-03 | 2013-08-14 | 汕头大学 | Input method of wearable finer-sensing wireless communication, and input device using input method |
| CN110478917A (en) * | 2014-05-21 | 2019-11-22 | 环球城市电影有限责任公司 | For tracking system and method used in investigation amusement park equipment |
| CN111450541A (en) * | 2014-05-21 | 2020-07-28 | 环球城市电影有限责任公司 | Automated optical tracking system for amusement park components |
| US10788603B2 (en) | 2014-05-21 | 2020-09-29 | Universal City Studios Llc | Tracking system and method for use in surveying amusement park equipment |
| CN111450541B (en) * | 2014-05-21 | 2021-05-11 | 环球城市电影有限责任公司 | Automated optical tracking system for amusement park components |
| CN110478917B (en) * | 2014-05-21 | 2021-05-25 | 环球城市电影有限责任公司 | Tracking system and method for use in surveying amusement park equipment |
| CN111854597A (en) * | 2020-05-29 | 2020-10-30 | 北京慧宸信博科技有限公司 | Method, device and system for detecting relative rotation between components |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102750578A (en) | RFID (Radio Frequency Identification Devices) label with mechanical displacement detector, RFID system and mechanical displacement detection method | |
| CN103455776A (en) | Mechanical displacement measurement RFID system and mechanical displacement measurement method thereof | |
| CN102842015A (en) | RFID (radio frequency identification) system for detecting degree of closeness and method for detecting distance between objects | |
| CN102750577A (en) | RFID (Radio Frequency Identification Devices) label with proximity sensor, RFID system and method for detecting distance between objects | |
| CN102750576A (en) | Radio frequency identification device (RFID) label with level-detecting device, RFID system with level-detecting device and level detection method | |
| CN202736099U (en) | RFID tag with proximity sensitive device and RFID system with proximity sensitive device | |
| CN102722746A (en) | RFID label with thermosensitive device, RFID system and temperature detection method | |
| CN102722747A (en) | RFID label with thermosensitive device, RFID system and temperature detection method | |
| CN102809583A (en) | RFID (Radio Frequency Identification) system of measuring gas concentration and method of measuring gas concentration of RFID system | |
| CN102831463A (en) | RFID (Radio Frequency Identification Device) label with mechanical displacement detection device, RFID system and mechanical displacement detection method | |
| CN102819718A (en) | RFID (radio frequency identification device) system for measuring magnetic field intensity and method for measuring magnetic field intensity | |
| CN202584180U (en) | RFID label with temperature-sensitive device and RFID system | |
| CN102842059A (en) | RFID (Radio Frequency Identification devices) tag with approached type sensitive device, RFID system and object distance detecting method | |
| CN102708400A (en) | RFID (Radio Frequency Identification Device) label with magnetically susceptible device, RFID system and magnetic field detection method | |
| CN103455778A (en) | Object position measurement RFID system and object position measurement method thereof | |
| CN202693069U (en) | RFID system used for level measurement | |
| CN102750572A (en) | RFID (Radio Frequency Identification Devices) label with moisture sensor, RFID system and method for detecting moisture | |
| CN202694396U (en) | Radio frequency identification device (RFID) label and RFID system with approaching sensitive device | |
| CN202734752U (en) | RFID system for measuring degree of proximity | |
| CN202563540U (en) | RFID label with moisture sensing device and RFID system | |
| CN202694357U (en) | RFID (Radio Frequency Identification) system for measuring temperature | |
| CN102750571A (en) | Radio frequency identification device (RFID) label with stress sensitive device, RFID system with stress sensitive device and stress detection method | |
| CN102810181A (en) | RFID tag with gas sensitive device, RFID system and gas concentration detecting method | |
| CN102779261A (en) | RFID (Radio Frequency Identification) system for measuring materiel position and materiel position measuring method of syste | |
| CN202693068U (en) | Radio frequency identification device (RFID) system used for measuring material level |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121024 |