CN106980144A - A kind of hard label mass parameter detects circuit - Google Patents
A kind of hard label mass parameter detects circuit Download PDFInfo
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- CN106980144A CN106980144A CN201710172342.5A CN201710172342A CN106980144A CN 106980144 A CN106980144 A CN 106980144A CN 201710172342 A CN201710172342 A CN 201710172342A CN 106980144 A CN106980144 A CN 106980144A
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- module
- circuit
- coil
- mass parameter
- hard label
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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
Circuit is detected the invention discloses a kind of hard label mass parameter, including main control module, pumping signal generation module, D/A module, the first amplification circuit module, sensor equivalent circuit module, follows circuit module, second order product parallel circuit module, AC DC conversion circuit modules, the second amplification circuit module, A/D module, LCD MODULE.It can accurately determine hard label mass parameter using the detection circuit that AT89C51 is that processor devises hard label mass parameter, simple in construction, stable.
Description
Technical field：
The invention belongs to detection device technical field, a kind of hard label mass parameter detection circuit is specifically related to.
Background technology：
The standards such as ISO/IEC18046-3-2007 give the basic rule of eas system (EAS) label detection
Model requirement.Hard label manufacturer of the country is in the method and ISO/IEC18046-3-2007 of label quality detection device at present
The method provided is consistent.From the point of view of existing literature, the object studied both at home and abroad is based on soft label, around two coil configuration sensing
Device is carried out.Such as：Song little Feng, Zhu Yaping have studied unicoil sensor model and double-coil sensor model structure feature；Li Jia
Fine horse utilizes magnetic field simulation software Ansoft HFSS, and simulation modeling is carried out to a variety of double-coil sensor models.Research shows：It is double
Area, the coiling number of turn, label placement location and the label and sensor relative position of coil type sensor circle can all influence hard mark
Sign mass parameter accuracy.This two coil configuration existing defects are transmitting and between receiving coil, label is with launching and receiving
It can all be interfered with each other between coil；Meanwhile, influence of the transmitting coil to receiving coil is superimposed on the magnetic field of label generation, it is impossible to area
Point.These can all cause resonant frequency FXDeviation is produced, the influence to quality factor Q value decision errors will be even more serious.
The core of hard label electronic component is many turn coils by being inserted with bar magnet and connected with electric capacity.To electronic tag
Circuit structure progress is equivalent, and its circuit theory diagrams is as shown in Figure 1.The resonance angular frequency of this circuit：
Wherein, L is tag coil equivalent inductance, and C is the equivalent capacity of label, and w is angular frequency.
In surveillance zone, transmitter is with certain frequency to receiver transmission signal.Transmitter is typically mounted at recipient
The gateway in retail shop, library etc., forms certain monitoring space.When label passes through detection zone, detection zone contains
The magnetic field changed with frequency, the inductance of inside tags can produce induced voltage, form induced-current, and this induced-current can also be produced
The Distribution of Magnetic Field in magnetic field, in turn Interference Detection region, makes detection coil produce an obvious disturbing signal, this interference letter
It number can also be received by the receiver, then judge by the analysis of microprocessor, the ring of siren will be controlled.Receiving coil is received
To induced signal also have the quality parameter information of label.Obviously the disturbing signal produced when resonance occurs for label is most strong, mark
The quality factor q value of label is bigger, and the selecting frequency characteristic of label is better, the presence of the easier identification label of corresponding receiver.
Conventional test device is similar to used EAS system in practice at present.Zhu Yaping is detected to this twin coil
Technique study shows：Mutual inductance increase between tag coil and transmitting and receiving coil, the aggravation of resonant frequency deviation, or even nothing
Method is detected to label.
The content of the invention：
For above-mentioned technical problem, the present invention proposes a kind of hard label mass parameter detection circuit.
To reach above-mentioned purpose, technical scheme is as follows：
A kind of hard label mass parameter detects circuit, including：
Main control module, the main control module is single-chip microcomputer；
Pumping signal generation module, the pumping signal generation module is used for the ac-excited signal for producing transmitting coil,
The square-wave signal delivery outlet of the pumping signal generation module is connected with the main control module, for providing ac-excited signal frequency
Rate information；
D/A module and the first amplification circuit module, the input of the D/A module are connected with the main control module, the DA
The output end of module connects first amplification circuit module, and the output end of first amplification module connects the pumping signal production
The input of raw module, the analog voltage of the D/A module output end is exported after first amplification circuit module amplification to be adjusted
Frequency voltage gives the pumping signal generation module；
Sensor equivalent circuit module and follow circuit module, electricity is followed described in the sensor equivalent circuit module connection
Road module, described to follow circuit module to connect the pumping signal generation module, the pumping signal generation module is produced just
String ripple signal through following in circuit module follow circuit after be connected to emission lines in the sensor equivalent circuit module
On circle；
Second order product parallel circuit module and AC-DC conversion circuit modules, the second order product parallel circuit module and the sensor
Equivalent circuit module is connected, and the AC-DC conversion circuit modules are connected with the second order product parallel circuit module, the second order product point
Circuit module is handled the output signal of receiving coil in the sensor equivalent circuit module, and by the reception after processing
The signal of coil, which is transferred in AC-DC conversion circuit modules, completes AC-DC conversions, obtains the RMS voltage of signal；
Second amplification circuit module and A/D module, second amplification circuit module and the AC-DC conversion circuit modules
Connection, the input of the A/D module is connected with second amplification circuit module, the output end of the A/D module and the master
Module connection is controlled, second amplification circuit module carries out scale operation amplification to the RMS voltage, effective after amplification
Threshold voltage is sent in the main control module after A/D module completes AD conversion and carries out data processing；
LCD MODULE, the LCD MODULE is connected with the main control module, and the LCD MODULE is used for
Display main control module carries out the hard label mass parameter obtained after data processing.
As the preferred of above-mentioned technical proposal, the sensor in the sensor equivalent circuit module is sensed using four coils
Device is popped one's head in, and the four coil pickoffs probe includes the first transmitting coil, the second transmitting coil, main receiving coil, auxiliary reception line
Circle.
As the preferred of above-mentioned technical proposal, first transmitting coil is identical with the second transmitting coil structure, institute
State the first transmitting coil and second transmitting coil operationally constitutes helmholtz coil, the main receiving coil and described
Auxiliary receiving coil diameter is identical, oppositely oriented, and the diameter of first transmitting coil is 4 times of the main receiving coil diameter,
The diameter of the main receiving coil is more than the diameter of the bar magnet coil in hard label, and the diameter of the main receiving coil is less than 1.5
The diameter of bar magnet coil in times hard label.
As the preferred of above-mentioned technical proposal, the main control module uses AT89C51 single-chip microcomputers.
As the preferred of above-mentioned technical proposal, the pumping signal generation module uses signal generator chip IC L8038,
The signal generator chip IC L8038 is operated in hopping pattern.
As the preferred of above-mentioned technical proposal, the D/A module uses the analog-digital chip MAX5822 of 12.
As the preferred of above-mentioned technical proposal, the AC-DC conversion circuit modules use AD736 chips.
As the preferred of above-mentioned technical proposal, the A/D module uses MAX1240 chips.
As the preferred of above-mentioned technical proposal, the LCD MODULE uses LM016L Liquid Crystal Modules.
As the preferred of above-mentioned technical proposal, the hard label mass parameter include hard label resonant frequency and quality because
Element.
The beneficial effects of the present invention are：It utilizes the detection that AT89C51 is that processor devises hard label mass parameter
Circuit, can accurately determine hard label mass parameter, simple in construction, stable.
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 hard label circuit theory diagrams；
Fig. 2 detects circuit diagram for the hard label mass parameter of one embodiment of the invention；
Fig. 3 is the sensor construction schematic diagram of one embodiment of the invention；
Fig. 4 is the sensor equivalent circuit working model of one embodiment of the invention；
Fig. 5 is the transducer emulation circuit schematic diagram of one embodiment of the invention；
Fig. 6 is the sensor circuit simulation curve schematic diagram of one embodiment of the invention；
Fig. 7 is the hard label mass parameter software program flow chart of one embodiment of the invention.
Symbol description in figure：
The transmitting coils of Lf1- first, the transmitting coils of Lf2- second, the main receiving coils of Lz-, the auxiliary receiving coils of Lf-.
Embodiment：
As shown in Fig. 2 the hard label mass parameter detection circuit of the present invention, including：
Main control module, the main control module is single-chip microcomputer；The main control module uses AT89C51 single-chip microcomputers.
Pumping signal generation module, the pumping signal generation module is used for the ac-excited signal for producing transmitting coil,
The square-wave signal delivery outlet of the pumping signal generation module is connected with the main control module, for providing ac-excited signal frequency
Rate information；The pumping signal generation module uses signal generator chip IC L8038, the signal generator chip
ICL8038 is operated in hopping pattern.
D/A module and the first amplification circuit module, the input of the D/A module are connected with the main control module, the DA
The output end of module connects first amplification circuit module, and the output end of first amplification module connects the pumping signal production
The input of raw module, the analog voltage of the D/A module output end is exported after first amplification circuit module amplification to be adjusted
Frequency voltage gives the pumping signal generation module；The D/A module uses the analog-digital chip MAX5822 of 12.
Sensor equivalent circuit module and follow circuit module, electricity is followed described in the sensor equivalent circuit module connection
Road module, described to follow circuit module to connect the pumping signal generation module, the pumping signal generation module is produced just
String ripple signal through following in circuit module follow circuit after be connected to emission lines in the sensor equivalent circuit module
On circle；In the present embodiment, the sensor in the sensor equivalent circuit module is popped one's head in using four coil pickoffs, such as Fig. 3 institutes
Show, four coil pickoff probe includes the first transmitting coil Lf1, the second transmitting coil Lf2, main receiving coil Lz, auxiliary connect
Take-up circle Lf.First transmitting coil is identical with the second transmitting coil structure, first transmitting coil and described
Two transmitting coils operationally constitute helmholtz coil, and the main receiving coil is identical with the auxiliary receiving coil diameter, rotation
To on the contrary, the diameter of first transmitting coil is 4 times of the main receiving coil diameter, the diameter of the main receiving coil is big
The diameter of bar magnet coil in hard label, the diameter of the main receiving coil is less than the bar magnet coil in 1.5 times of hard labels
Diameter.
Second order product parallel circuit module and AC-DC conversion circuit modules, the second order product parallel circuit module and the sensor
Equivalent circuit module is connected, and the AC-DC conversion circuit modules are connected with the second order product parallel circuit module, the second order product point
Circuit module is handled the output signal of receiving coil in the sensor equivalent circuit module, and by the reception after processing
The output signal of coil, which is transferred in AC-DC conversion circuit modules, completes AC-DC conversions, obtains the RMS voltage of signal；Institute
AC-DC conversion circuit modules are stated using AD736 chips.
Second amplification circuit module and A/D module, second amplification circuit module and the AC-DC conversion circuit modules
Connection, the input of the A/D module is connected with second amplification circuit module, the output end of the A/D module and the master
Module connection is controlled, second amplification circuit module carries out scale operation amplification to the RMS voltage, effective after amplification
Threshold voltage is sent in the main control module after A/D module completes AD conversion and carries out data processing；The A/D module is used
MAX1240 chips.
LCD MODULE, the LCD MODULE is connected with the main control module, and the LCD MODULE is used for
Display main control module carries out the hard label mass parameter obtained after data processing.The LCD MODULE uses LM016L liquid crystal
Module.The hard label mass parameter includes hard label resonant frequency and quality factor.
In the present embodiment, the operation principle of sensor probe is：It is attached at axle center when transmitting coil application is ac-excited
Magnetic flux is zero (main and auxiliary reception line in nearly generation uniform magnetic field interior in a big way, the enclosed region of main and auxiliary receiving coil formation
Circle is oppositely oriented).Hard label is placed in main receiving coil central area, hard label sensing also produces magnetic field, this magnetic field is for the
For the enclosed region of one transmitting coil composition, magnetic flux is zero；Second transmitting coil and auxiliary receiving coil from hard label farther out,
Do not influenceed by hard label induced field, but for main receiving coil, because diameter is close with hard label bar magnet coil, and
In the induced field region of hard label, thus the flux change of main receiving coil can consider and sense magnetic by hard label completely
Field is determined.
During sensor circuit Equivalent, the induced voltage of coil mutual inductance is equivalent to the voltage source of current control.
Popped one's head in operation principle by the sensor, the corresponding circuit model of sensor probe is as shown in Figure 4.Wherein, Rs is transmitting coil
1st, 2 internal resistance, Lf1, Lf2 are the equivalent inductance of transmitting coil 1,2, and Lz is that main receiving coil equivalent inductance, Lf are ancillary coil
Equivalent inductance.The vector relations of transmitting and label segment circuit are as follows in Fig. 4：
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), M1, M be respectively hard label and transmitting coil, the mutual inductance of main reception ray circle, Z, Z1For
The impedance of label, transmitting coil, θ is vector currentWith the vectorial angle between label admittance (1/Z).It is right from formula (6)
For sensor and a certain detection hard label, parameter M, M1, R be all to determine value, during for given driving source, electric currentMould,
And its be also to determine with Z vectorial angle.Therefore, byHard label T (jw) information can be obtained.
In this sensor circuit designs, according to the signal U on T (jw) in formula (6) and Fig. 3 receiving coils0Transformational relation,
Also need to handle w2, handled during emulation using second order product parallel circuit.The artificial circuit and design parameter that sensor Simulation is used are such as
Shown in Fig. 5, Fig. 6, using Proteus frequency analysis function, the output signal at C3 (1) place in Fig. 5 in Fig. 5 to encourage U1For
The normalization amplitude-versus-frequency curve of reference is as shown in fig. 6, according to simulation result, the quality that can obtain label by Fig. 6 curve is joined
Number FXWith Q values, illustrate the feasibility of the method.
Hardware circuit design is to detect 58KHz sound magnetic hard labels as object in the present embodiment, circuit theory diagrams such as Fig. 2 institutes
Show.The main control module of system uses AT89C51 single-chip microcomputers；The ac-excited signal of transmitting coil is by signal generator chip
ICL8038 is produced, and ICL8038 is operated in P3.4 mouthfuls of hopping pattern, ICL8038 square-wave signals delivery outlet and AT89C51 single-chip microcomputers
Connecting, there is provided ac-excited signal frequency information.Fm voltage UfControlled by the analog-digital chip MAX5822 of 12,
MAX5822 chips simulate voltage output and export U through one-level scaling circuit If；The sine wave signal that ICL8038 chips are produced
It is followed by through follower circuit on the transmitting coil of sensor, the output signal of sensor receiving coil passes through second order product parallel circuit
Resume module, through AD736 processing, completes AC-DC conversions, obtains the RMS voltage of signal, this RMS voltage is same by one-level
To after scaling circuit II, through MAX1240 chips, realize that feeding single-chip microcomputer carries out data processing, processing data after A/D conversions
Result resonant tag frequency FXShown with quality factor q with LM016L Liquid Crystal Modules.
In the present embodiment, software program uses modularized design scheme, is write using C51 language, the structuring of C51 language
Modularized design is preferably realized with efficient performance.It is main by main program, A/D conversion routines, square wave frequence measure subprogram,
D/A conversion routines, the LED display driving several module compositions of subprogram.Wherein A/D conversion routines, D/A conversion routines,
The programming of LED display driving subprograms is repeated no more.
Main program flow as shown in fig. 7, complete the initialization to I/O mouthfuls, timer/counter T0 and liquid crystal drive first
Set, then call D/A conversion routines to export frequency sweep control voltage Uf, then call A/D conversion routines recording responses to believe
Number UdcValue, calls square wave frequence measure subprogram, record exciting signal frequency F；Frequency control voltage UfAfter frequency sweep of changing from small to big terminates,
Final program finds UdcMaximum and its corresponding FXValue, and find 0.707 (Udc)maxCorresponding two frequency value Fs1、F2, ask
Go out Q, show FX、Q。
A kind of hard label mass parameter detection circuit described in the present embodiment, including main control module, pumping signal produce mould
Block, D/A module, the first amplification circuit module, sensor equivalent circuit module, follow circuit module, second order product parallel circuit module,
AC-DC conversion circuit modules, the second amplification circuit module, A/D module, LCD MODULE.It is processor using AT89C51
The detection circuit of hard label mass parameter is devised, hard label mass parameter can be accurately determined, simple in construction, operation is steady
It is fixed.
Obviously, above-described embodiment is only intended to clearly illustrate example, and the not 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 (10)
1. a kind of hard label mass parameter detects circuit, it is characterised in that including：
Main control module, the main control module is single-chip microcomputer；
Pumping signal generation module, the pumping signal generation module is used for the ac-excited signal for producing transmitting coil, described
The square-wave signal delivery outlet of pumping signal generation module is connected with the main control module, for providing ac-excited signal frequency letter
Breath；
D/A module and the first amplification circuit module, the input of the D/A module are connected with the main control module, the D/A module
Output end connect first amplification circuit module, the output end of first amplification module connects the pumping signal and produces mould
The input of block, the analog voltage of the D/A module output end exports frequency modulation electricity after first amplification circuit module amplification
Press to the pumping signal generation module；
Sensor equivalent circuit module and follow circuit module, circuit mould is followed described in the sensor equivalent circuit module connection
Block, it is described to follow circuit module to connect the pumping signal generation module, the sine wave that the pumping signal generation module is produced
Signal through following in circuit module follow circuit after be connected on the transmitting coil in the sensor equivalent circuit module；
Second order product parallel circuit module and AC-DC conversion circuit modules, the second order product parallel circuit module and the sensor are equivalent
Circuit module is connected, and the AC-DC conversion circuit modules are connected with the second order product parallel circuit module, the second order product parallel circuit
Module is handled the output signal of receiving coil in the sensor equivalent circuit module, and by the receiving coil after processing
Output signal be transferred in AC-DC conversion circuit modules complete AC-DC conversion, obtain signal RMS voltage；
Second amplification circuit module and A/D module, second amplification circuit module are connected with the AC-DC conversion circuit modules,
The input of the A/D module is connected with second amplification circuit module, the output end of the A/D module and the main control module
Connection, second amplification circuit module carries out scale operation amplification, the RMS voltage after amplification to the RMS voltage
It is sent to after A/D module completes AD conversion in the main control module and carries out data processing；
LCD MODULE, the LCD MODULE is connected with the main control module, and the LCD MODULE is used to show
Main control module carries out the hard label mass parameter obtained after data processing.
2. a kind of hard label mass parameter detection circuit according to claim 1, it is characterised in that：
Sensor in the sensor equivalent circuit module is popped one's head in using four coil pickoffs, the four coil pickoffs probe
Including the first transmitting coil, the second transmitting coil, main receiving coil, auxiliary receiving coil.
3. a kind of hard label mass parameter detection circuit according to claim 2, it is characterised in that：
First transmitting coil is identical with the second transmitting coil structure, first transmitting coil and second transmitting
Coil operationally constitutes helmholtz coil, and the main receiving coil is identical with the auxiliary receiving coil diameter, oppositely oriented,
The diameter of first transmitting coil is 4 times of the main receiving coil diameter, and the diameter of the main receiving coil is more than hard mark
The diameter of bar magnet coil in label, the diameter of the main receiving coil is less than the diameter of the bar magnet coil in 1.5 times of hard labels.
4. a kind of hard label mass parameter detection circuit according to claim 1, it is characterised in that：
The main control module uses AT89C51 single-chip microcomputers.
5. a kind of hard label mass parameter detection circuit according to claim 1, it is characterised in that：
The pumping signal generation module uses signal generator chip IC L8038, the signal generator chip IC L8038 works
Make in hopping pattern.
6. a kind of hard label mass parameter detection circuit according to claim 1, it is characterised in that：
The D/A module uses the analog-digital chip MAX5822 of 12.
7. a kind of hard label mass parameter detection circuit according to claim 1, it is characterised in that：
The AC-DC conversion circuit modules use AD736 chips.
8. a kind of hard label mass parameter detection circuit according to claim 1, it is characterised in that：
The A/D module uses MAX1240 chips.
9. a kind of hard label mass parameter detection circuit according to claim 1, it is characterised in that：
The LCD MODULE uses LM016L Liquid Crystal Modules.
10. a kind of hard label mass parameter detection circuit according to claim 1, it is characterised in that：
The hard label mass parameter includes hard label resonant frequency and quality factor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710172342.5A CN106980144A (en) | 2017-03-22 | 2017-03-22 | A kind of hard label mass parameter detects circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710172342.5A CN106980144A (en) | 2017-03-22 | 2017-03-22 | A kind of hard label mass parameter detects circuit |
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| CN201710172342.5A Pending CN106980144A (en) | 2017-03-22 | 2017-03-22 | A kind of hard label mass parameter detects circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NZ203790A (en) * | 1982-04-12 | 1986-06-11 | Ici America Inc | Radio frequency surveillance zone tag detector:separate transmit and receive antennas |
| CN1791895A (en) * | 2003-05-19 | 2006-06-21 | 关卡系统股份有限公司 | EAS/RFID identification hard tags |
| CN106443826A (en) * | 2016-10-08 | 2017-02-22 | 绍兴职业技术学院 | EAS hard tag mass parameter detection device |
| CN207008084U (en) * | 2017-03-22 | 2018-02-13 | 绍兴职业技术学院 | A kind of hard label mass parameter detects circuit |
-
2017
- 2017-03-22 CN CN201710172342.5A patent/CN106980144A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NZ203790A (en) * | 1982-04-12 | 1986-06-11 | Ici America Inc | Radio frequency surveillance zone tag detector:separate transmit and receive antennas |
| CN1791895A (en) * | 2003-05-19 | 2006-06-21 | 关卡系统股份有限公司 | EAS/RFID identification hard tags |
| CN106443826A (en) * | 2016-10-08 | 2017-02-22 | 绍兴职业技术学院 | EAS hard tag mass parameter detection device |
| CN207008084U (en) * | 2017-03-22 | 2018-02-13 | 绍兴职业技术学院 | A kind of hard label mass parameter detects circuit |
Non-Patent Citations (1)
| Title |
|---|
| 白炳良 等: "基于ICL8038函数信号发生器的设计", 《大学物理实验》 * |
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