CN106443826B - EAS hard tag mass parameter detection device - Google Patents
EAS hard tag mass parameter detection device Download PDFInfo
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- CN106443826B CN106443826B CN201610878253.8A CN201610878253A CN106443826B CN 106443826 B CN106443826 B CN 106443826B CN 201610878253 A CN201610878253 A CN 201610878253A CN 106443826 B CN106443826 B CN 106443826B
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- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 9
- 230000010354 integration Effects 0.000 claims abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V13/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups G01V1/00 – G01V11/00
Abstract
EAS hard tag mass parameter detection device, including a pair of of transmitting coil, a pair of of receiving coil and signal processing module, a pair of of transmitting coil includes left transmitting coil and right transmitting coil, left transmitting coil, the structure of right transmitting coil are identical, and left transmitting coil and right transmitting coil the two hub of a spools are on the same axis；The spacing of left transmitting coil and right transmitting coil is equal to the radius of left transmitting coil；Signal processing module includes difference channel and two-stage integration circuit, and two signal input parts of difference channel both ends of not connecting with left receiving coil and right receiving coil respectively are electrically connected.It is simple in structure, stable, being capable of Accurate Determining EAS hard label mass parameters --- resonant frequency F and quality factor Q value.
Description
Technical field：
The present invention relates to eas system (EAS) detection technique field, more specifically to a kind of EAS is with firmly
The detection sensor of label quality parametric resonance frequency F and quality factor Q value.
Background technology：
The application of eas system (EAS) is more and more, but domestic production producer is to the electronics mark in EAS
Label, the particularly detection of hard label quality rest on manual testing's stage, expose that accuracy of detection is poor, and automatization level is low, nothing
The shortcomings of method assesses the mass parameter of product.
At present, ISO/IEC 18046-3-2007 give the label of EAS system and the basic rule of anti-theft detection system
Model requirement.Some domestic scholars study electronic tag on-line parameter detection technique according to specification, such as：Yang Chengzhong etc. is proposed
The method that is detected using Mutual Inductance Coupling principle to the mass parameter of electronic tag.Song little Feng, Zhu Yaping have studied single line
Coil sensor model and double-coil sensor model structure feature.From the point of view of existing literature, the object studied both at home and abroad is with soft mark
Based on label, carried out around two coil configuration sensor.Research shows area, the coiling number of turn, the hard mark of Double-coil type sensor circle
Label placement location and hard label and sensor relative position can all influence hard label mass parameter accuracy.This structure, which exists, to be lacked
It is trapped between transmitting and receiving coil, can be all interfered with each other between label and transmitting and receiving coil；Particularly label is to emission lines
The influence of circle will change the intensity in former magnetic field, and cause data correction not since influence of the different labels to transmitting coil is different
It may realize；Meanwhile influence of the transmitting coil to receiving coil is superimposed on the magnetic field of label generation, cannot be distinguished by；These are all
Resonant frequency can be caused to produce deviation, the influence to Q value decision errors will be even more serious.In order to overcome the problems referred above, patent of invention
(102735943 B of CN) passive electronic label resonant frequency and Q values detection sensor provide a kind of above-mentioned transmitting of elimination with receiving
Between coil, problem is interfered with each other between label and transmitting and receiving coil.But this patent sensor construction is complicated, including two hairs
Ray circle and a receiving coil, its transmitting coil are made of main transmitting coil and auxiliary transmitting coil again, and receiving coil is also by leading
Transmitting coil and auxiliary transmitting coil composition, it substantially needs 6 coils to form a sensor, and coil number is more, and manufacture is of high cost；
In addition, this sensor is high to the coherence request of transmitting, receiving coil, manufacture craft requires high；Moreover this sensor construction does not have
Method eliminates the influence in earth's magnetic field.
The content of the invention：
The purpose of the present invention and provides a kind of EAS hard tag mass parameter detection dress aiming at the deficiency of the prior art
Put, it is simple in structure, stable, being capable of Accurate Determining EAS hard label mass parameters --- resonant frequency F and quality factor
Q values.
The technology solution of the present invention is as follows：
EAS hard tag mass parameter detection device, including a pair of of transmitting coil a pair of receiving coil and signal processing module,
A pair of of transmitting coil includes left transmitting coil and right transmitting coil, and left transmitting coil, the structure of right transmitting coil are identical, left
Transmitting coil and right transmitting coil the two hub of a spools are on the same axis；Spacing of left transmitting coil and right transmitting coil etc.
In the radius of left transmitting coil；
Left transmitting coil and right transmitting coil are connected with conducting wire, when left transmitting coil and the application of right transmitting coil are ac-excited
During signal, electric current should pass through left transmitting coil and right transmitting coil with the direction that circulates in the same direction；
A pair of of receiving coil includes left receiving coil and right receiving coil, and left receiving coil and right receiving coil structure are complete
Identical, the center of left receiving coil and right receiving coil is on the same axis；
Spacing should be less than the half of left transmitting coil and right transmitting coil spacing between left receiving coil and right receiving coil；
Left receiving coil and right receiving coil are connected with conducting wire, when left receiving coil and the application of right receiving coil are ac-excited
During signal, electric current should pass through left receiving coil and right receiving coil with the direction that reversely circulates；
Signal processing module includes difference channel and two-stage integration circuit, two signal input parts of difference channel respectively with a left side
Receiving coil and right receiving coil do not connect both ends electrical connection.
The a quarter of a diameter of left transmitting coil diameter of the left receiving coil；The diameter of left receiving coil should be less than
The diameter of core element bar magnet coil in 1.5 times of hard labels.
The left receiving coil or right receiving coil are used for being inserted into detected hard label core element bar magnet coil.
The beneficial effects of the present invention are：
It is simple in structure, stable, being capable of Accurate Determining EAS hard label mass parameters --- resonant frequency F and product
Quality factor Q values.
Brief description of the drawings：
Fig. 1 is the circuit diagram of signal processing module part of the present invention；
Fig. 2 is transmitting coil of the present invention and the circuit diagram of receiving coil part；
Fig. 3 is hard label electronic component structure equivalent circuit diagram；
Fig. 4 is the signal graph that oscillograph receives.
Embodiment：
Embodiment：As shown in Fig. 1,2, EAS hard tag mass parameter detection device, including a pair of of transmitting coil Lf1, Lf2
A pair of of receiving coil Lz, Lf and signal processing module, a pair of of transmitting coil include left transmitting coil Lf1 and right transmitting coil Lf2,
Left transmitting coil, the structure of right transmitting coil are identical, in left transmitting coil Lf1 and right the two coils of transmitting coil Lf2
The heart is on the same axis；The spacing of left transmitting coil Lf1 and right transmitting coil Lf2 is equal to the radius of left transmitting coil Lf1；
Left transmitting coil Lf1 and right transmitting coil Lf2 are connected with conducting wire, as left transmitting coil Lf1 and right transmitting coil Lf2
When applying ac-excited signal, electric current should pass through left transmitting coil Lf1 and right transmitting coil Lf2 with the direction that circulates in the same direction；
A pair of of receiving coil includes left receiving coil Lz and right receiving coil Lf, left receiving coil Lz and right receiving coil Lf
Structure is identical, and the center of left receiving coil Lz and right receiving coil Lf are on the same axis；
Spacing should be less than left transmitting coil Lf1 and right transmitting coil Lf2 between left receiving coil Lz and right receiving coil Lf
The half of spacing；
Left receiving coil Lz and right receiving coil Lf are connected with conducting wire, when left receiving coil Lz and right receiving coil Lf applies
During ac-excited signal, electric current should pass through left receiving coil Lz and right receiving coil Lf with the direction that reversely circulates；
Signal processing module includes difference channel and two-stage integration circuit, two signal input parts of difference channel respectively with a left side
Receiving coil Lz and right receiving coil Lf do not connect both ends electrical connection.
The a quarter of a diameter of left transmitting coil Lf1 diameters of the left receiving coil Lz；Left receiving coil Lz's is straight
Footpath should be less than the diameter of core element bar magnet coil in 1.5 times of hard labels.
The left receiving coil Lz or right receiving coils Lf is used for being inserted into detected hard label core element bar magnet coil.
Operation principle：First, when transmitting coil applies alternating message source, left receiving coil Lz and right receiving coil Lf exist
(two coil circle center line connectings) neighbouring interior generation uniform magnetic field in a big way on axis, earth's magnetic field is in left receiving coil Lz and right reception line
It is also identical to enclose the vector at Lf places, and left receiving coil Lz and right receiving coil Lf are oppositely oriented, thus left receiving coil Lz with
Magnetic flux is zero in the enclosed region that right receiving coil Lf is formed, and from the influence of electromagnetic field, then left receiving coil Lz and the right side connect
The voltage difference of the induced electromotive force of take-up circle Lf will depend entirely on tested hard label.
Secondly, when tested hard label be placed in right receiving coil (by be tested hard label be placed in right receiving coil exemplified by illustrate) it is attached
Near central area, regardless of tested hard label induced field direction, since right transmitting coil diameter is more than tag coil,
Induced field is for the enclosed region that right transmitting coil forms, magnetic flux zero, and left transmitting coil and right receiving coil are from hard
Farther out, from the influence of hard label induced field, this has just reached transmitting coil magnetic fields in hard label but has been tested hard label
Label induced field will not react on the effect of transmitting coil.But for right receiving coil, because diameter and label
Bar magnet coil is close, and in the induced field region of label, left receiving coil is then because distance relation is influenced extremely by label
It is faint, thus the induced voltage change of right receiving coil is it is considered that the induced field produced completely by being tested hard label is determined
It is fixed.
Finally, the induced voltage signal of receiving coil output connects amplifier input terminal, and the high input impedance of amplifier is equivalent to big
Load, receiving coil internal current is almost nil at this time, so being produced in receiving coil without magnetic field, has reached tested hard label and has made
For receiving coil, but receiving coil will not react on the effect of label.
The core of hard label electronic component is one and is in series with the more turn coils of bar magnet and a capacitance that part is marked
Label can be inserted into excitation bar magnet in coil.Circuit equivalent, its equivalent circuit schematic are carried out to hard label electronic component structure
As shown in Figure 3.The then impedance of label is：
Wherein, R is Coil resistance, and L is tag coil inductance value, and C is the capacitance of label, and ω is angular frequency.As ω L-
During 1/ ω C=0, | Z (j ω) | it is minimum, show as real impedance characteristic.Angular frequency at this time is resonance angular frequency：
There is selecting frequency characteristic function in LC circuits in Fig. 3, and quality factor q value is to reflect an index of selecting frequency characteristic quality.Q
Value is bigger, and selecting frequency characteristic is better, and corresponding label quality is higher.
When sensor circuit model is analyzed, the induced voltage of coil mutual inductance is equivalent to the voltage source of current control.By upper
Sensor operating principles are stated, the corresponding circuit model of sensor is as shown in Figure 2.The vector of transmitting and label segment circuit in Fig. 2
Relation is as follows：
There is formula (3-4) must to export receiving coil：
Amplitude-versus-frequency curve formula (7) is normalized to formula (6) both sides modulus, and by label, formula (8) can be obtained.
Normalize amplitude-versus-frequency curve formula：
In above-mentioned formula (3-8), w is angular frequency, M, M1For label and transmitting coil, the mutual inductance for receiving ray circle, Z, Z1
For the impedance of label, transmitting coil.From formula (8), for sensor and a certain detection label of mark, parameter M, M1, Z, R all
It is to determine value, does not influence change curve shape of formula (8) the output signal with angular frequency.Therefore we can be according to test by formula (8)
Data deduce out T (jw), such as following formula (9).
WhereinFor a constant.
There is above-mentioned formula (9) to understand, to obtain the resonance characteristic curve of hard label, need to be to the w in denominator2Handled,
The present embodiment is handled using integrating circuit, and the integrating circuit that the present embodiment uses is as shown in Figure 3.
The present invention is based on Mutual Inductance Coupling principle, a kind of hard label mass parameter detection sensor structure is provided, using difference
Signal processing method, obtains hard label inductive signal, and using two level integrating circuit correction w2；Solves traditional two coil configuration
The problem of interference causes resonant frequency measurement error and can not test electronic tag Q values between sensor parts, while eliminate ground
The influence to detecting signal in magnetic field.
In this implementation, swept-frequency signal, access sensor signal transmitting are produced using signal generator (Tyke AFG3022C)
The both ends do not connected of coil, output signal U out is detected with oscillograph (Tyke C012537), right before hard label is not placed
Left receiving coil Lz and right receiving coil Lf relative positions are finely adjusted, and Uout outputs is close to 0V, eliminate systematic error it
Afterwards；Commercially available 58KHz hard labels are positioned in right receiving coil, the signal that oscillograph receives is as shown in figure 4, observation figure can
Know that the amplitude-versus-frequency curve of oscilloscope display is consistent with preferable amplitude-versus-frequency curve, the resonance of hard label can be obtained from this curve
Frequency F and quality factor Q value.
Claims (3)
1.EAS hard label mass parameter detection devices, including a pair of of receiving coil (Lz, Lf) of a pair of of transmitting coil (Lf1, Lf2)
And signal processing module, it is characterised in that：
A pair of of transmitting coil includes left transmitting coil (Lf1) and right transmitting coil (Lf2), left transmitting coil, right transmitting coil
Structure is identical, and left transmitting coil (Lf1) and right transmitting coil (Lf2) the two hub of a spools are on the same axis；Zuo Fa
The spacing of ray circle (Lf1) and right transmitting coil (Lf2) is equal to the radius of left transmitting coil (Lf1)；
Left transmitting coil (Lf1) and right transmitting coil (Lf2) are connected with conducting wire, when left transmitting coil (Lf1) and right transmitting coil
(Lf2) when applying ac-excited signal, electric current should pass through left transmitting coil (Lf1) and right transmitting coil with the direction that circulates in the same direction
(Lf2)；
A pair of of receiving coil includes left receiving coil (Lz) and right receiving coil (Lf), left receiving coil (Lz) and right receiving coil
(Lf) structure is identical, and the center of left receiving coil (Lz) and right receiving coil (Lf) is on the same axis；
Spacing should be less than left transmitting coil (Lf1) and right transmitting coil between left receiving coil (Lz) and right receiving coil (Lf)
(Lf2) half of spacing；
Left receiving coil (Lz) and right receiving coil (Lf) are connected with conducting wire, when left receiving coil (Lz) and right receiving coil (Lf)
When applying ac-excited signal, electric current should pass through left receiving coil (Lz) and right receiving coil (Lf) with the direction that reversely circulates；
Signal processing module includes difference channel and two-stage integration circuit, two signal input parts of difference channel respectively with left reception
Coil (Lz) and right receiving coil (Lf) do not connect both ends electrical connection.
2. EAS hard tag mass parameter detection device according to claim 1；It is characterized in that：Left receiving coil (Lz)
A diameter of left transmitting coil (Lf1) diameter a quarter；The diameter of left receiving coil (Lz) should be less than in 1.5 times of hard labels
The diameter of core element bar magnet coil.
3. EAS hard tag mass parameter detection device according to claim 1；It is characterized in that：Left receiving coil (Lz)
Or right receiving coil (Lf) is used for being inserted into detected hard label core element bar magnet coil.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610878253.8A CN106443826B (en) | 2016-10-08 | 2016-10-08 | EAS hard tag mass parameter detection device |
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| CN201610878253.8A CN106443826B (en) | 2016-10-08 | 2016-10-08 | EAS hard tag mass parameter detection device |
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| CN106443826B true CN106443826B (en) | 2018-04-17 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106980144A (en) * | 2017-03-22 | 2017-07-25 | 绍兴职业技术学院 | A kind of hard label mass parameter detects circuit |
| 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 |
| CN107239079B (en) * | 2017-07-12 | 2023-11-03 | 绍兴职业技术学院 | Hard tag magnetic inserting device and control method thereof |
| CN107368875B (en) * | 2017-07-12 | 2023-06-16 | 绍兴职业技术学院 | Hard tag inserts magnetism device convenient to remove |
| CN108549265B (en) * | 2018-05-17 | 2020-10-09 | 绍兴职业技术学院 | Passive electronic hard tag magnet insertion control method based on fuzzy control |
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