CN206960559U - A kind of EAS electronic tags mass parameter detector - Google Patents
A kind of EAS electronic tags mass parameter detector Download PDFInfo
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- CN206960559U CN206960559U CN201720325018.8U CN201720325018U CN206960559U CN 206960559 U CN206960559 U CN 206960559U CN 201720325018 U CN201720325018 U CN 201720325018U CN 206960559 U CN206960559 U CN 206960559U
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Abstract
The utility model discloses a kind of EAS electronic tags mass parameter detector, including：Sensing probe, signal processing module, control unit, Man Machine Interface, power module, the sensing probe includes transmitting coil, left receiving coil, right receiving coil, and the signal processing module includes pumping signal source unit, difference unit, real effective detection unit, A/D converting units.The sensing probe of this detector is simple in construction, electronic tag mass parameter detection model is simple, electronic tag mass parameter is quickly and accurately determined by a kind of frequency-hopping method based on dichotomy --- resonant frequency F and quality factor Q value, meet existing electronic tag production process fast slowdown monitoring online, there is provided the demand of feedback control signal.
Description
Technical field：
The invention belongs to burglary protection system for commodities technical field, is specifically related to a kind of EAS electronic tags mass parameter-resonance
Frequency F and quality factor Q value detector.
Background technology：
Thief-proof (robber) system of eas system abbreviation EAS, also known as electronic goods, is that current larger retail industry is wide
One of commercial articles safety measure of general use.EAS is mainly made up of detector, decoder and electronic tag three parts.Electronic tag
It is divided into soft label and hard label, soft label cost is relatively low, is adhered directly on the commodity compared with " hard ", soft label is not reproducible to be made
With；The softer label of hard label nonrecurring cost is high, but may be reused.
The resonant frequency F and quality factor Q of electronic tag are its key quality parameters.Consult existing literature, ISO/IEC
18046-3-2007 gives the fundamental norms requirement of the label and anti-theft detection system of EAS system.According to above-mentioned specification, mesh
The sensing probe of preceding electronic tag is generally divided into two kinds of unicoil, twin coil structural models.Zhao Wannian, Song little Feng research surface are single
Coil probe detection method can detect the resonant frequency of electronic tag, but its Q value and other parameters can not be carried out analysis with
Calculate.Yang Chengzhong, Zhu Yaping et al. establish twin coil probe detection model using Mutual Inductance Coupling principle, can be with by this model
The parameters such as resonant frequency, Q values and the dischargeable capacity of label are detected, and there is also some shortcomings for the method：1) transmitting coil and electricity
Subtab coupled systemes numerical value increases, and very big skew occurs for the centre frequency of test；2) transmitting coil and receiving coil coupled systemes
Numerical value gradually increases, and system deviation reduces, but the bandwidth of overall waveform is changed, that is, has influence on label Q values.To overcome
Above mentioned problem, the B of Publication No. CN 102735943 patent of invention passive electronic label F and Q value detection sensor provide one kind
Eliminate between above-mentioned transmitting and receiving coil, problem is interfered with each other between label and transmitting and receiving coil.But this patent sensor
It is complicated, including two transmitting coils and a receiving coil, its transmitting coil is again by main transmitting coil and auxiliary transmitting coil
Composition, receiving coil are also made up of main transmitting coil and auxiliary transmitting coil, and it substantially needs 6 coils to form a sensor,
Coil number is more, and manufacturing cost is high；In addition, this sensor is high to the coherence request of transmitting, receiving coil, manufacture craft requirement
It is high；Moreover this sensor construction cannot eliminate the influence in earth's magnetic field.The utility model patent of Application No. 201610878253.8
Above-mentioned patent is improved, it is proposed that a kind of four coil sonde configurations, and sensor detection model is given, this patent is not
Foot is the coil number that uses or more, and signal transacting early stage is carried out by Second Order Integral circuit, and this patent without reference to
The circuit design of follow-up signal processing.In addition, existing electronic tag mass parameter detection is all by frequency sweeping method, label is obtained
Amplitude-versus-frequency curve, and then resonant frequency F and quality factor Q value are obtained, this method sweep time length；Produced in hard label
Cheng Zhong, the feedback signal that the method provides can not meet fast positioning bar magnet insertion depth, influence production efficiency.
The content of the invention：
The purpose of the present invention is the deficiency for prior art, and proposes a kind of EAS electronic tags mass parameter detector,
And it is related to the supporting sensor sensing sonde configuration of detector.This detector is simple in construction, and test speed is fast, stable, energy
Enough Accurate Determining EAS electronic tag mass parameters.
To reach above-mentioned purpose, technical scheme is as follows：
A kind of EAS electronic tags mass parameter detector, including it is sensing probe, signal processing module, control unit, man-machine
Interactive interface, power module；
The sensing probe includes transmitting coil, left receiving coil, right receiving coil, and the transmitting coil, the left side connect
Take-up circle, the right receiving coil are centrally located on same axis, and the transmitting coil is located at the left receiving coil and institute
State the centre of right receiving coil, the left receiving coil is identical with the structure of the right receiving coil, the left receiving coil and
The right receiving coil is connected by wired in series, when the left receiving coil and the right receiving coil have electric current, electric current
Circulation in the left receiving coil and the right receiving coil is oppositely oriented；
The signal processing module includes pumping signal source unit, difference unit, real effective detection unit, A/D conversions
Unit, the output end of the pumping signal source unit are connected with the transmitting coil, two inputs point of the difference unit
It is not connected with the left receiving coil, the right receiving coil, input and the difference of the real effective detection unit
The output end of unit is connected, and the input of the A/D converting units is connected with the output end of the real effective, and the A/D turns
The output end for changing unit is connected with described control unit；
The Man Machine Interface, the power module are connected with described control unit respectively.
As the preferred of above-mentioned technical proposal, the diameter of the transmitting coil be the left receiving coil diameter 1.5~
2.5 times, the diameter of the left receiving coil is 1.2~1.5 times of electronics hard label diameter, and the transmitting coil connects with the left side
Spacing between take-up circle, the right receiving coil is 1.3~1.8 times of the left receiving coil diameter.
As the preferred of above-mentioned technical proposal, the transmitting coil, the left receiving coil, the right receiving coil are adopted
With rectangle plane spiral winding, the length and width of the transmitting coil inner ring are the 1.5~2.5 of the length and width of the left receiving coil inner ring
Times, the length and width of the left receiving coil inner ring are 1.2~1.5 times of electronic soft label length and width, the transmitting coil and the left side
Spacing between receiving coil, the right receiving coil is 1.3~1.8 times of the transmitting coil inner race width.
As the preferred of above-mentioned technical proposal, the Man Machine Interface uses touch-screen.
As the preferred of above-mentioned technical proposal, the power module uses DC-DC module.
The beneficial effects of the present invention are：The sensing probe of this detector is simple in construction, the detection of electronic tag mass parameter
Model is simple, and electronic tag mass parameter is quickly and accurately determined by a kind of frequency-hopping method based on dichotomy --- resonance
Frequency F and quality factor Q value, meet existing electronic tag production process fast slowdown monitoring online, there is provided the need of feedback control signal
Ask.
Brief description of the drawings：
The following drawings is only intended to, in doing schematic illustration and explanation to the present invention, not delimit the scope of the invention.Wherein：
Fig. 1 is a kind of EAS electronic tags mass parameter detector structure composition block diagram of one embodiment of the invention；
Fig. 2 is a kind of preferable sensing probe structural representation for hard label detection of one embodiment of the invention；
Fig. 3 is a kind of preferable sensing probe structural representation for the detection of soft label of one embodiment of the invention；
Fig. 4 is the electronic tag circuit theory diagrams of one embodiment of the invention；
Corresponding circuit model figure when Fig. 5 is the sensing probe work of one embodiment of the invention；
Fig. 6 is a kind of exciting signal source element circuit schematic diagram of one embodiment of the invention；
Fig. 7 is a kind of difference unit circuit theory diagrams of one embodiment of the invention；
Fig. 8 is a kind of real effective detection cell circuit schematic diagram of one embodiment of the invention.
Symbol description in figure：
The right receiving coils of 1-, the left receiving coils of 2-, 3- transmitting coils, 4- hard labels, the soft labels of 5-.
Embodiment：
As shown in figure 1, a kind of EAS electronic tags mass parameter detector of the present invention, including sensing probe, signal transacting
Module, control unit, Man Machine Interface, power module.
The sensing probe includes transmitting coil, left receiving coil, right receiving coil, and the transmitting coil, the left side connect
Take-up circle, the right receiving coil are centrally located on same axis, and the transmitting coil is located at the left receiving coil and institute
State the centre of right receiving coil, the left receiving coil is identical with the structure of the right receiving coil, the left receiving coil and
The right receiving coil is connected by wired in series, when the left receiving coil and the right receiving coil have electric current, electric current
Circulation in the left receiving coil and the right receiving coil is oppositely oriented.
Fig. 2 is a kind of preferable sensing probe structure detected for hard label 4, to ensure that it is hard that sensing probe normally obtains
The quality parameter signal of label 4, when detecting hard label 4, the diameter of the transmitting coil 3 is the diameter of left receiving coil 2
1.5~2.5 times more suitable, and the diameter of the left receiving coil 2 is 1.2~1.5 times of more suitable, institutes of the diameter of hard label 4
It is the left diameter of receiving coil 2 to state the spacing between transmitting coil 3 and the left receiving coil 2, the right receiving coil 1
1.3~1.8 times more suitable.
Fig. 3 is a kind of preferable sensing probe structure for the detection of soft label 5, the transmitting coil 3, the left reception
Coil 2, the right receiving coil 1 use rectangle plane spiral winding, and spiral winding can be formed using PCB fabrication techniques, institute
The length and width for stating the inner ring of transmitting coil 3 are 1.5~2.5 times of the length and width of the inner ring of left receiving coil 2, the left receiving coil 2
The length and width of inner ring are 1.2~1.5 times of the soft length and width of label 5, the transmitting coil 3 and the left receiving coil 2, the right reception
Spacing between coil 1 is 1.3~1.8 times of the inner race width of transmitting coil 3 more suitable.
Sensing probe operation principle, illustrated with Fig. 2 embodiments.First, hard label 4 is introduced into probe detection zone
When, transmitting coil 3 applies AC signal excitation, the interior generation magnetic field in a big way near transmitting coil 3, due to left receiving coil
2nd, right receiving coil 1 is oppositely oriented, so magnetic flux is zero in the enclosed region that left receiving coil 2, right receiving coil 1 are formed,
Influence electricity kinetic potential produces.
Secondly, when tested hard label 4 be placed in right receiving coil 1 (by be tested hard label 4 be placed in right receiving coil 1 exemplified by say
It is bright) neighbouring central area, hard label 4 influenceed by the magnetic field of transmitting coil 3, produces induced electromotive force, formed in hard label 4
Induced-current, this induced-current can also produce magnetic field.Left receiving coil 2, right receiving coil 1 sense magnetic field caused by hard label 4,
Form induced electromotive force；Wherein, right receiving coil 1 is located near hard label 4, influenceed by magnetic field caused by hard label 4 it is obvious,
And left receiving coil 2 is away from electronic tag 4, it is believed that do not influenceed by the induced field of hard label 4.So transmitting coil 3 applies
During the AC signal excitation of different frequency, left receiving coil 2, the induced electromotive force sum of right receiving coil 1 contain hard label 4
Quality information.
As illustrated in figures 4-5, further illustrate that sensing probe obtains electronic tag amplitude versus frequency characte information from the angle of circuit
Operation principle.
Passive electronic label is in series by a coil and an electric capacity, and part hard label is in order to improve quality factor
Q values, bar magnet can be inserted in coil.Electronic tag circuit theory diagrams are as shown in Figure 4.Wherein, R is Coil resistance, and L is electronics mark
Sign coil inductance, C be electronic tag capacitance, the resonance angular frequency F of this RLC series circuitX：
When analyzing the equivalent-circuit model of sensing probe working condition, using Mutual Inductance Coupling principle, by coil-induced voltage
It is equivalent to the voltage source of current control.By above-mentioned sensing probe operation principle, pop one's head in work when corresponding circuit model such as Fig. 5 institutes
Show.So that tested label is placed in right receiving coil end as an example, M, M in Fig. 51Respectively electronic tag and transmitting coil, right reception
The mutual inductance of ray circle, L1, L2, L3 are transmitting coil, left receiving coil, the equivalent inductance of right receiving coil respectively, in Fig. 5
The vector relations of transmitting coil and label segment circuit are as follows：
Receiving coil output signal can be obtained by formula (2-3)：
Amplitude-versus-frequency curve formula (5) is normalized to formula (4) both sides modulus, and by label, formula (6) can be obtained.
Normalize amplitude-versus-frequency curve formula：
In above-mentioned formula (2-6), Z, Z1For the impedance of label, transmitting coil, θ is electric currentBetween label admittance (1/Z)
Vectorial angle.From formula (6), for sensor and a certain detected hard label, parameter M, M1, R be all to determine value, for
During given driving source, electric currentMould, and its be also to determine with 1/Z vectorial angle.Therefore, byIt can be marked firmly
Sign T (jw) information.
The signal processing module includes pumping signal source unit, difference unit, real effective detection unit, A/D conversions
Unit.Fig. 6-8 is a kind of preferred embodiment circuit theory diagrams of signal processing module unit of the present invention.
The output end of the pumping signal source unit is connected with the transmitting coil.In the present embodiment, exciting signal source list
Member uses DDS (Direct Digital Frequency Synthesis) circuit.AD9833 chips are employed in Fig. 6, it is
Programmable waveform generator, sine wave, triangular wave, square wave output can be produced.AD9833 without outward element, output frequency and
Phase can all be can easily be accommodated by software programming, and frequency register is 28, and when dominant frequency clock is 25MHz, precision is
0.1Hz.AD9833 has 3 serial interface mouth lines, is easy to compatible with DSP and various main flow microcontrollers.Signal SMA in Fig. 6,
GND ends are connected with transmitting coil both ends respectively.
Two inputs of the difference unit are connected with the left receiving coil, the right receiving coil respectively.This reality
Apply in example, difference unit can use difference amplifier to realize.Difference unit can employ AD8129 difference amplifiers in Fig. 7,
AD8129 be difference to single-ended amplifier, there is high common-mode rejection ratio (CMRR) in high frequency.It can be effectively served as
High speed gauges amplifier, or for differential signal to be converted into single-ended signal.Signal SMB, SMC end decibels and a left side in Fig. 7 connect
The non-connected end connection of take-up circle, left receiving coil.If left receiving coil, right receiving coil both ends induced electromotive force are too small, difference
Unit preferably employs AD8130 difference amplifiers, and it carries gain enlarging function.
The input of the real effective detection unit is connected with the output end of the difference unit, the real effective inspection
The function of surveying unit is that AC signal is converted into RMS voltage as output.The function of real effective detection unit is to obtain
The direct current signal of AC signal virtual value is taken, Fig. 8 real effective detection units employ AD637 chips, and AD637 can calculate any
The Ture RMS, mean-square value or absolute value of complexity exchange (or exchange plus direct current) input waveform, and Equivalent DC output is provided
Voltage.SMD output ends in Fig. 7 are connected with the SME ends in Fig. 8.
The input of the A/D converting units is connected with the output end of the real effective, the A/D converting units it is defeated
Go out end with described control unit to be connected.
The Man Machine Interface, the power module are connected with described control unit respectively.In the present embodiment, the people
Machine interactive interface uses touch-screen, as human-computer interaction interface.
The power module uses DC-DC module, and suitable operating voltage and energy are provided for other modules, unit.
Described control unit is used for the digital quantity value for receiving A/D converting units, and control pumping signal source unit produces different
The signal excitation of frequency, data exchange is carried out with Man Machine Interface.
Above-mentioned A/D converting units, control unit, to refer to touch-screen, power module in Electronics Engineer's industry be general knowledge,
This is not in specific illustrative embodiment.
A kind of resonant frequency F of EAS electronic tags detection method, comprises the following steps：
S1：Determine electronic label resonance frequency F test scope [fa, fb]；
S2：Determine the minimum resolution ε of exciting signal source, assignment f0=fa, f2=fb；
S3：Calculate △ f=(f2-f0)/4；
S4：Control unit sends order, pumping signal source unit is sequentially generated amplitude equal, frequency f0、f0+△f、
f0+2△f、f0+3△f、f2Sine wave exciting signal；
S5：Control unit obtain successively by signal processing module handle left receiving coil, right receiving coil sensing it is poor
Digital quantity response signal U corresponding to sub-signal0(f0)、U0(f0+△f)、U0(f0+2△f)、U0(f0+3△f)、U0(f2), to U0
(f0)、U0(f0+△f)、U0(f0+2△f)、U0(f0+3△f)、U0(f2) respectively by 1, (f0/(f0+△f))2、(f0/(f0+2△
f))2、(f0/(f0+3△f))2、(f0/f2)2It is modified again, frequency corresponding to maximum is designated as f in this 5 values after amendmentmax。
S6：If △ f≤ε, fmaxResonant frequency F values as electronic tag, EP (end of program), otherwise into step S7；
S7：Set f0=fmax- △ f, f2=fmax+ △ f, and return to step S3.
Wherein, frequency range [fa, fb], it can be determined by the working range of electronic tag, the audio magnetic label such as 58KHz is qualified
Working range be generally (57.8~58.2) KHz；ε can determine by signal exciting unit, such as above-mentioned AD9833 chips, during dominant frequency
When clock is 25MHz, precision 0.1Hz, both minimum frequency resolution ratio ε was 0.1Hz.
A kind of detection method of the quality factor Q value of EAS electronic tags, the detection method refer to that one kind is based on dichotomy
Find real effective detection unit output maximum Umax、0.707UmaxWhen respective frequencies frequency-hopping method.Q value detection methods are
By obtain T (jw) for 0.707 when, corresponding Frequency point F up and downUAnd FD, it is calculated by formula (8).Comprise the following steps：
T1：Obtain FDValue；
T2：Obtain FUValue；
T3：According to the FDValue and the FUValue and resonant frequency F values, calculate and obtain quality factor Q value：
Q=F/ (FU-FD) (8)
The step T1, that is, find FDThe method of value specifically comprises the following steps：
T11：When pumping signal source frequency is F values, the left receiving coil, the right receiving coil that are handled by signal processing module
Digital quantity response signal corresponding to sensing differential signal is designated as U0(F), FDFind scope [fa, F]；
T12：Assignment f0=F, f1=fa；
T13：Calculate △ f=(f0-f1)/2；
T14：Control unit sends order, and it is f pumping signal source unit is produced frequency1+ △ f sine wave exciting signals；
T15：Control unit obtains left receiving coil, the right receiving coil sensing difference letter by signal processing module processing
Digital quantity response signal U corresponding to number0(f1+ △ f), to U0(f1+ △ f) presses (F/ (f1+△f))2It is Ux to be modified postscript again,
Revised value and 0.707U0(F) compare；
T16：If Ux>0.707U0(F), into step T17, otherwise into step T18；
T17：Assignment f0=f0- △ f, into step T19；
T18：Assignment f1=f1+△f；
T19：If △ f≤ε, f1It is used as FDIt is worth, EP (end of program), otherwise return to step T13.
The step T2, that is, find FUThe method of value specifically comprises the following steps：
T21：When pumping signal source frequency is F values, the left receiving coil, the right receiving coil that are handled by signal processing module
Digital quantity response signal corresponding to sensing differential signal is designated as U0(F), FUFind scope [F, fb]；
T22：Assignment f0=F, f2=fb；
T23：Calculate △ f=(f2-f0)/2；
T24：Control unit sends order, and it is f pumping signal source unit is produced frequency2- △ f sine wave exciting signals；
T25：Control unit obtains left receiving coil, the right receiving coil sensing difference letter by signal processing module processing
Digital quantity response signal U corresponding to number0(f2- △ f), to U0(f2- △ f) An (F/ (f2-△f))2Being modified postscript again is
Ux, revised value and 0.707U0(F) compare；
T26：If Ux>0.707U0(F), into step T27, otherwise into step T28；
T27：Assignment f0=f0+ △ f, into step T29；
T28：Assignment f2=f2-△f；
T29：If △ f≤ε, f2It is used as FUIt is worth, EP (end of program), otherwise return to step T23.
A kind of EAS electronic tags mass parameter detector and its detection method described in the present embodiment, including：Sensitivity is visited
Head, signal processing module, control unit, Man Machine Interface, power module, the sensing probe includes transmitting coil, a left side connects
Take-up circle, right receiving coil, the signal processing module include pumping signal source unit, difference unit, real effective detection list
Member, A/D converting units.The sensing probe of this detector is simple in construction, and electronic tag mass parameter detection model is simple, passes through one
Frequency-hopping method of the kind based on dichotomy quickly and accurately determines electronic tag mass parameter --- resonant frequency F and quality factor Q
Value, meets existing electronic tag production process fast slowdown monitoring online, there is provided the demand of feedback control signal.
Obviously, above-described embodiment is only intended to clearly illustrate example, and is not the restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among changing still in the protection domain of the invention.
Claims (5)
1. a kind of EAS electronic tags mass parameter detector, it is characterised in that including sensing probe, signal processing module, control
Unit, Man Machine Interface, power module；
The sensing probe includes transmitting coil, left receiving coil, right receiving coil, the transmitting coil, the left reception line
Circle, the right receiving coil are centrally located on same axis, and the transmitting coil is located at the left receiving coil and the right side
The centre of receiving coil, the left receiving coil is identical with the structure of the right receiving coil, the left receiving coil and described
Right receiving coil is connected by wired in series, and when the left receiving coil and the right receiving coil have electric current, electric current is in institute
The circulation stated in left receiving coil and the right receiving coil is oppositely oriented；
The signal processing module includes pumping signal source unit, difference unit, real effective detection unit, A/D converting units,
The output end of the pumping signal source unit is connected with the transmitting coil, two inputs of the difference unit respectively with institute
State left receiving coil, the right receiving coil is connected, input and the difference unit of the real effective detection unit
Output end is connected, and the input of the A/D converting units is connected with the output end of the real effective, the A/D converting units
Output end be connected with described control unit；
The Man Machine Interface, the power module are connected with described control unit respectively.
2. EAS electronic tags mass parameter detector according to claim 1, it is characterised in that：The transmitting coil
Diameter is 1.5~2.5 times of the left receiving coil diameter, and the diameter of the left receiving coil is electronics hard label diameter
1.2~1.5 times, the spacing between the transmitting coil and the left receiving coil, the right receiving coil is the left reception
1.3~1.8 times of coil diameter.
3. EAS electronic tags mass parameter detector according to claim 1, it is characterised in that：The transmitting coil, institute
State left receiving coil, the right receiving coil and use rectangle plane spiral winding, the length and width of the transmitting coil inner ring are institutes
State the length and width of left receiving coil inner ring 1.5~2.5 times, the length and width of the left receiving coil inner ring are electronic soft label length and width
1.2~1.5 times, the spacing between the transmitting coil and the left receiving coil, the right receiving coil is the emission lines
Enclose inner race width 1.3~1.8 times.
4. EAS electronic tags mass parameter detector according to claim 1, it is characterised in that：The man-machine interaction connects
Mouth uses touch-screen.
5. EAS electronic tags mass parameter detector according to claim 1, it is characterised in that：The power module is adopted
Use DC-DC module.
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| CN201720325018.8U CN206960559U (en) | 2017-03-30 | 2017-03-30 | A kind of EAS electronic tags mass parameter detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064650A (en) * | 2017-03-30 | 2017-08-18 | 绍兴职业技术学院 | A kind of EAS electronic tags mass parameter detector and its detection method |
| CN108226634A (en) * | 2018-03-15 | 2018-06-29 | 衢州市江氏电子科技有限公司 | A kind of electronic soft label detection of characteristic parameters instrument |
-
2017
- 2017-03-30 CN CN201720325018.8U patent/CN206960559U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064650A (en) * | 2017-03-30 | 2017-08-18 | 绍兴职业技术学院 | A kind of EAS electronic tags mass parameter detector and its detection method |
| CN107064650B (en) * | 2017-03-30 | 2023-06-23 | 绍兴职业技术学院 | EAS electronic tag quality parameter detector and detection method thereof |
| CN108226634A (en) * | 2018-03-15 | 2018-06-29 | 衢州市江氏电子科技有限公司 | A kind of electronic soft label detection of characteristic parameters instrument |
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Granted publication date: 20180202 Termination date: 20200330 |