CN101980306A - Method and tester for detecting magnetic characteristic of coin - Google Patents

Method and tester for detecting magnetic characteristic of coin Download PDF

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Publication number
CN101980306A
CN101980306A CN2010105091390A CN201010509139A CN101980306A CN 101980306 A CN101980306 A CN 101980306A CN 2010105091390 A CN2010105091390 A CN 2010105091390A CN 201010509139 A CN201010509139 A CN 201010509139A CN 101980306 A CN101980306 A CN 101980306A
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coin
magnetic
test coil
magnetic field
coil
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CN101980306B (en
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黄来友
黄翔
方元
徐丽新
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NANJING CBPM-GREAT WALL FINANCIAL EQUIPMENT Co Ltd
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NANJING CBPM-GREAT WALL FINANCIAL EQUIPMENT Co Ltd
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Abstract

The invention relates to a method for detecting the magnetic characteristic of a coin, which comprises the following steps of: 1) generating detection current by using a controllable power supply; 2) detecting a magnetic field generated when an electromagnet is driven by the current; 3) detecting the magnetic displacement of a coin to be tested in the magnetic field and the magnetic field intensity of the magnetic field; and 4) processing the values of the detected magnetic displacement and magnetic field intensity to obtain each magnetic parameter of the coin to be tested. A tester for the magnetic characteristic of the coin comprises a computer, an interface circuit, a scanning power supply, the electromagnet, a sensor and a coil which is wound on the electromagnet, wherein the computer is connected with the interface circuit for communication; the waveform output end of the interface circuit is connected with the waveform input end of the scanning power supply; the output end of the scanning power supply is connected with the coil on the electromagnet; and the sensor is arranged in the magnetic field formed by the electromagnet. In the technical scheme of the invention, the magnetic characteristics of the integral coin, a coin intermediate generated in the process of producing the coin and metal bodies similar to the coin are tested by a closed magnetic circuit under the condition that the coin is not damaged.

Description

Coin magnetics characteristic detection method and tester
Technical field
The present invention relates to the measurement recognition technology of coin and analog, specifically is a kind of coin magnetics characteristic detection method and tester, and it can test the coin intermediate that produces in whole piece of coin, the coin production run and the magnetics feature of class coin metallic object.
Background technology
Want the magnetics feature of test material, at first this material should be made pellet shapes, or cylindrical, or film shape, the sample of these three kinds of shapes is tested the demagnetizing field that is produced under open-flux path be known.In the test, sample is placed open-flux path, write down test result, revise by the demagnetizing field model of sample again, thereby obtain the magnetics characteristic quantity of sample.
Coin is neither pellet shapes is cylindrical, neither film shape, do not know under open-flux path, to test the model of the demagnetizing field that is produced to coin, and can't revise test result, thereby, can not use the magnetics feature that open-flux path comes testing coin.
How under the situation of not destroying coin, the magnetics feature of testing coin? in the prior art, the Margarita company of Germany uses the magnetics feature that the closed magnetic circuit method is come test class coin body, and the Margarita magnetics characteristic test instrument of development is public offering in the world.But, Margarita magnetics characteristic test instrument is a general magnetics characteristic test instrument, its test coil area is the several times of coin area, the thickness of test coil also is the several times of coin thickness, according to theory as can be known, come the magnetics feature of testing coin with this tester, measured result is false.In order to remedy the deficiency of this respect, this instrument increases the correction coil again, in order to the result is revised.This correction belongs to the experience correction, does not belong to theoretical and revises, and therefore, German Margarita magnetics characteristic test instrument can not directly be measured the magnetics feature eigenvalue of coin, and process correction can not obtain the magnetics feature eigenvalue of coin equally,
Summary of the invention
1. goal of the invention
In order to solve the above-mentioned problems in the prior art, the present invention proposes a kind of coin magnetics characteristic detection method and tester.
2. technical scheme
A kind of coin magnetics characteristic detection method comprises step:
1) sends the detection electric current by controllable electric power;
2) detect the current drives electromagnet and produce magnetic field;
3) detection is located at the magnetic induction density of the tested coin in the described magnetic field and the magnetic field intensity in described magnetic field;
4) value of detected magnetic induction density and magnetic field intensity is handled, obtained each magnetic parameter of tested coin;
In the described step 1), described detection electric current is a controllable variations;
Described step 2) in, described magnetic field is D.C. magnetic field;
In the described step 3), described tested coin constitutes closed magnetic circuit in D.C. magnetic field;
Described tested coin is with the magnetic induction density B test coil outward, at the other magnetic field intensity H test coil that is glued with of magnetic induction density B test coil; Described B test coil and H test coil produce corresponding induced voltage, and this induced voltage is converted to magnetic induction density B and magnetic field intensity H through step 4).
In the step 1), detecting electric current is triangular current, and its cycle is controlled under 1～60s, and current value is 7 ± 10%, under this current drives, makes step 2) in magnetic field be approximately D.C. magnetic field; Described electromagnet is a C shape, and tested coin is placed between two magnetic pole heads, forms closed magnetic circuit.
In the step 3), the diameter of described B test coil is than the diameter of coin big 0.4 millimeter (be slightly larger than coin diameter, so that tightly entangle tested coin, like this, test result need not be revised); The thickness of B test coil is not more than the thickness of coin; Described H test coil coiling shape is semicircle.
In the step 4), the B test coil that collects and H test coil are produced corresponding induced voltage convert digital quantity to, again this digital quantity is carried out following processing:
If the magnetic induction density B magnetic test coil produces induced voltage eB, magnetic field intensity H magnetic test coil produces induced voltage eH:
1) quantizing process of magnetic flux phi comprises two kinds of the quantifications of the quantification of analog integration value and/or digital integration value, and wherein, analog integration only is used for the auxiliary figure Integral Technology and quantizes, and is standard with the analog integration result promptly, by relatively, gives digital integration quantitative.
A. the quantizing process of analog integration value,
Earlier induced voltage eB and eH are sent into analogue integrator respectively, the output quantity of analogue integrator are quantified as weber:
The corresponding simulation output of 2mWb shelves 1mWb 1V---0.001mWb/1mv
The corresponding simulation output of 20mWb shelves 10mWb 1V---0.01mWb/1mv
The corresponding simulation output of 200mWb shelves 100mWb 1V---0.1mWb/1mv
The corresponding simulation output of 2000mWb shelves 1000mWb 1V---1mWb/1mv
Again according to 1Wb=10 8Maxwall is converted into the Maxell with measured result, thereby records Φ BAnd Φ H
B. the quantizing process of digital integration value,
Induced voltage eB and eH are carried out integration respectively:
: Φ B ′ = ∫ e B dt
Φ H ′ = ∫ e H dt
For same piece of tested coin, under the testing conditions same case, its digital integration value should equate with the analog integration value, that is: With
Figure BSA00000306003900034
Can get:
Figure BSA00000306003900035
With
Figure BSA00000306003900036
η in the formula 1And η 2Be the quantizing factor of digital integration, the digital integration value
Figure BSA00000306003900037
With
Figure BSA00000306003900038
Multiply by its quantizing factor η respectively 1And η 2, obtain actual Φ BAnd Φ H
2) quantizing process of magnetic induction density B
A. the quantizing process of magnetic induction density B,
Get by formula:
Figure BSA00000306003900039
The Φ that digital integration is obtained B, the B test coil number of turns and area substitution formula (5), promptly get the B value;
B. the quantizing process of magnetic field intensity H
In the H test coil, put into a weak magnetic material, in magnetic field:
Figure BSA000003060039000310
In the formula (6), obtain N HS HValue; For each magnetic field intensity test coil, this value is a fixed value;
To record Φ HWith fixing constant N HS HSubstitution formula (5):
Figure BSA00000306003900041
A kind of coin magnetics characteristic test instrument comprises computer, interface circuit, scanning power supply, by electromagnet and sensor, the coil of coiling on the electromagnet; Described computer is connected with interface circuit, communicates; The waveform output terminal of described interface circuit connects the waveform input end of scanning power supply; The output terminal of scanning power supply connects the coil on the electromagnet; Described sensor is located in the magnetic field of electromagnet formation;
Described sensor comprises magnetic induction density B test coil and magnetic field intensity H test coil; Described B test coil surrounds annular, leaves the placing space of tested coin in the middle of the annular; The H test coil is close to by the B test coil.
Described interface circuit is to be the circuit of core with the dsp chip; The D/A source end of described dsp chip connects the input end of scanning power supply; Two A/D input ends of dsp chip connect an end that connects B test coil and H test coil respectively, the other end ground connection of B test coil and H test coil.
Described electromagnet is a C shape, and tested coin is placed between two magnetic pole heads, forms closed magnetic circuit.
The diameter of described B test coil is bigger 0.4 millimeter than the diameter of coin; The thickness of B test coil is not more than the thickness of coin; Described H test coil coiling shape is semicircle.
Described computer is connected with printer and display, as output device.
Compared with prior art, the technical program is used the coin intermediate that produces in whole piece of coin of closed magnetic circuit test, the coin production run and the magnetics feature of class coin metallic object under the situation of not destroying coin.In conjunction with existing software, can obtain magnetic hysteresis loop B-Hi, permeability curcve u-Hi, maximum saturation magnetic field intensity Hmax, maximum magnetic induction Bs, remanent magnetism Br, coercivity H, the initial permeability μ of whole piece of coin oWith maximum permeability μ m
The coin material is made microspheric form, column type, or Bao Muxing, the result who under open-flux path, tests with the coin material is made round coin, uses coming to the same thing that closed magnetic circuit of the present invention tests.Therefore, use the directly magnetics feature of testing coin of the present invention, and do not need coin is made microspheric form column type, or Bao Muxing.
Four, description of drawings
Fig. 1 test coil synoptic diagram of the present invention.
Fig. 2 closed magnetic circuit synoptic diagram of the present invention.
In Fig. 3 specific embodiment, the system architecture synoptic diagram.
In Fig. 4 specific embodiment, circuit theory synoptic diagram figure.
In Fig. 5 specific embodiment, test Renminbi 0.5 coin magnetic hysteresis loop figure.
Among the figure,
Five, specific embodiments
The invention will be further described below in conjunction with accompanying drawing and embodiment:
With reference to figure 3, the specific embodiment of the invention is made up of computer 1, interface 2, SL-5 scanning power supply 3, electromagnet 4 and printer 5.Computer 1 connects SL-5 scanning power supply 3 by USB interface, and the output of SL-5 scanning power supply 3 connects the coil of electromagnet 4; The magnetic induction density coil B of the testing sensor in the electromagnet 4 and magnetic field intensity coil H be the B interface and the H interface of connection interface 2 respectively.The computer expert crosses the another USB interface and connects printer.
The present invention uses the loudspeaker voice coil winding technology, is two coils of each coin coiling, and the diameter of coil is bigger 0.4 millimeter than the diameter of coin, and thickness is not more than the thickness of coin.Wherein a coil is enclosed within on the coin, and as coin magnetic induction density B test coil, the another coil is made semicircle, is close to the magnetic induction density test coil, and as magnetic field intensity H test coil, the testing sensor of making as shown in Figure 1.
The present invention adopts closed magnetic circuit to come the magnetics feature of testing coin according to electromagnetic coupling theory, and block diagram of the present invention as shown in Figure 2.Principle of work is as follows:
By software programming, single-chip microcomputer in the master control computer control interface and D/A produce weak power triangular wave, and this triangular wave is sent into the SL5-10 scanning power supply.Scanning power supply is sent high power triangular current drive magnetic, produces the electromagnetic field of alternation.The watt level of alternating electromagnetic field and cycle are controlled by the master control computer, and maximum current is 7 amperes, and the cycle is optional between 1 second to 60 seconds, is approximately D.C. magnetic field, thereby realize quasi static test.
Tested coin is put into the B coil of testing sensor, and testing sensor as shown in Figure 1.Testing sensor is put between two magnetic pole heads of electromagnet, makes the magnetic circuit of a closure of electromagnet formation, as shown in Figure 3.
Under the electromagnetic field effect of alternation, B coil and H coil in the testing sensor produce induced voltage respectively, and they deliver to control interface respectively, carry out difference and amplify.Signal after the amplification is delivered to the A/D of control interface again.Single-chip microcomputer in the control interface is converted into digital quantity with simulating signal, and gives the master control computer.
The master control computer is controlled D/A on the one hand and is produced triangular wave, receives the digital quantity after A/D changes simultaneously again, and they carry out synchronously.The master control computer also resists each magnetic parameter of drift processing, digital integration processing, graphic presentation and count coins simultaneously to the digital quantity of A/D conversion.
When needing, the printable result who tests.
The present invention adopts electromagnetic system unit description: B → G SGauss; S → cm 2Centimetre square; H → O eOersted; Φ → Maxell.
Induced signal in the coil is treated to the magnetic physical quantity, and promptly how quantizing the magnetics characteristic quantity is key of the present invention.Magnetics characteristic quantity quantizing process is divided into two and goes on foot greatly:
Under the effect in magnetic field, the magnetic induction density coil in the testing sensor will produce induced voltage eB, will produce induced voltage eH in the magnetic field intensity coil.
1, the quantizing process of magnetic flux phi
A. the quantizing process of analog integration value
The quantization step of analog integration value is as follows:
(1) induced voltage eB and eH enter analogue integrator (native system uses BH-100 type magnetic-flux meter) respectively, and computing machine quantizes its output quantity.
(2) output quantity with analogue integrator is quantified as weber.
The corresponding simulation output of 2mWb shelves 1mWb 1V (0.001mWb/1mv)
The corresponding simulation output of 20mWb shelves 10mWb 1V (0.01mWb/1mv)
The corresponding simulation output of 200mWb shelves 100mWb 1V (0.1mWb/1mv)
The corresponding simulation output of 2000mWb shelves 1000mWb 1V (1mWb/1mv)
(3) according to 1Wb=10 8Maxwall (Maxell) is converted into the Maxell with measured result, thereby records Φ BAnd Φ H
B. the quantizing process of digital integration value
The drifting problem that the above analog integration technology is difficult to overcome owing to existence, thereby practical application digital integration technology of the present invention quantizes and the analog integration technology is used for the auxiliary figure Integral Technology.
The Applied Digital Integral Technology, induced voltage is carried out integration respectively:
: Φ B ′ = ∫ e B dt
Φ ′ H = ∫ e H dt
For same piece of coin, use same sensor, its digital integration value should equate with the analog integration value.
That is:
Φ B = η 1 Φ B ′ - - - ( 1 )
Φ H = η 2 Φ H ′ - - - ( 2 )
Can get:
η 1 = Φ B Φ B ′ - - - ( 3 )
η 2 = Φ H Φ H ′ - - - ( 4 )
η in the following formula 1And η 2It is exactly the quantizing factor of digital integration.In the practical application, digital integration value Φ B' and Φ H' multiply by its quantizing factor η respectively 1And η 2, just obtain actual Φ BAnd Φ H
2, the quantizing process of magnetic induction density B and magnetic field intensity H
A. the quantizing process of magnetic induction density B
Get by formula:
B = Φ B N B S B - - - ( 5 )
The Φ that digital integration is obtained B, the magnetic induction density test coil number of turns and area substitution following formula, promptly get the B value.
The number of turns of the magnetic induction density test coil of this test macro is 40 circle, i.e. N B=40.The diameter of each coin is known, thus:
0.1 unit:
Figure BSA00000306003900078
0.5 unit:
Figure BSA00000306003900079
1.0 unit:
Figure BSA000003060039000710
Above value substitution formula (5) is just obtained corresponding B value (Gauss).
B. the quantizing process of magnetic field intensity H
From principle, also can use formula (5) and come H is quantized, still, because the area irregularity of magnetic field intensity test coil, thereby can't accurately calculate N HS HValue, have to ward off in addition small stream footpath.
In magnetic induction coil, put into a weak magnetic material, as unit of plastic.In magnetic field:
Φ B N B S B = Φ H N H S H - - - ( 6 )
In the formula (6), Φ B, Φ H, N BS BBe known, thereby try to achieve N HS HValue.For each magnetic field intensity test coil, this value is a fixed value.These values of this test macro are:
0.1 unit: N HS N=30.915
0.5 unit: N HS H=31.4
1.0 unit: N HS H=37.29
To record Φ HWith fixing constant N HS HSubstitution formula (5).
:
H = Φ H N H S H - - - ( 7 )

Claims (9)

1. coin magnetics characteristic detection method is characterized in that comprising step:
1) sends the detection electric current by controllable electric power;
2) detect the current drives electromagnet and produce magnetic field;
3) detection is located at the magnetic induction density of the tested coin in the described magnetic field and the magnetic field intensity in described magnetic field;
4) value of detected magnetic induction density and magnetic field intensity is handled, obtained each magnetic parameter of tested coin;
In the described step 1), described detection electric current is a controllable variations;
Described step 2) in, described magnetic field is D.C. magnetic field;
In the described step 3), described tested coin constitutes closed magnetic circuit in D.C. magnetic field;
Described tested coin is with the magnetic induction density B test coil outward, at the other magnetic field intensity H test coil that is glued with of magnetic induction density B test coil; Described B test coil and H test coil produce corresponding induced voltage, and this induced voltage is converted to magnetic induction density B and magnetic field intensity H through step 4).
2. coin magnetics characteristic detection method according to claim 1 is characterized in that in the step 1), and detecting electric current is triangular current, its cycle is controlled under 1～60s, current value is 7 ± 10%, under this current drives, makes step 2) in magnetic field be approximately D.C. magnetic field; Described electromagnet is a C shape, and tested coin is placed between two magnetic pole heads, forms closed magnetic circuit.
3. coin magnetics characteristic detection method according to claim 1 is characterized in that in the step 3) that the diameter of described B test coil is bigger 0.4 millimeter than the diameter of coin; The thickness of B test coil is not more than the thickness of coin; Described H test coil coiling shape is semicircle.
4. coin magnetics characteristic detection method according to claim 1 is characterized in that in the step 4), the B test coil that collects and H test coil is produced corresponding induced voltage convert digital quantity to, again this digital quantity is carried out following processing:
If the magnetic induction density B magnetic test coil produces induced voltage eB, magnetic field intensity H magnetic test coil produces induced voltage eH:
1) quantizing process of magnetic flux phi comprises two kinds of the quantifications of the quantification of analog integration value and/or digital integration value, and wherein, analog integration is used for the auxiliary figure integration and quantizes:
A. the quantizing process of analog integration value,
Earlier induced voltage eB and eH are sent into analogue integrator respectively, the output quantity of analogue integrator are quantified as weber:
The corresponding simulation output of 2mWb shelves 1mWb 1V---0.001mWb/1mv
The corresponding simulation output of 20mWb shelves 10mWb 1V---0.01mWb/1mv
The corresponding simulation output of 200mWb shelves 100mWb 1V---0.1mWb/1mv
The corresponding simulation output of 2000mWb shelves 1000mWb 1V---1mWb/1mv
Again according to 1Wb=10 8Maxwall is converted into the Maxell with measured result, thereby records Φ BAnd Φ H
B. the quantizing process of digital integration value,
Induced voltage eB and eH are carried out integration respectively:
: Φ B ′ = ∫ e B dt
Φ H ′ = ∫ e H dt
For same piece of tested coin, under the testing conditions same case, its digital integration value should equate with the analog integration value, that is:
Figure FSA00000306003800023
With
Figure FSA00000306003800024
Can get:
Figure FSA00000306003800025
With
Figure FSA00000306003800026
η in the formula 1And η 2Be the quantizing factor of digital integration, digital integration value Φ B' and Φ H' multiply by its quantizing factor η respectively 1And η 2, obtain actual Φ BAnd Φ H
2) quantizing process of magnetic induction density B
A. the quantizing process of magnetic induction density B,
Get by formula:
Figure FSA00000306003800029
The Φ that digital integration is obtained B, the B test coil number of turns and area substitution formula (5), promptly get the B value;
B. the quantizing process of magnetic field intensity H
In the H test coil, put into a weak magnetic material, in magnetic field:
Figure FSA000003060038000210
In the formula (6), obtain N HS HValue; For each magnetic field intensity test coil, this value is a fixed value;
To record Φ HWith fixing constant N HS HSubstitution formula (5):
5. coin magnetics characteristic test instrument is characterized in that comprising computer, interface circuit, scanning power supply, by electromagnet and sensor, the coil of coiling on the electromagnet; Described computer is connected with interface circuit, communicates; The waveform output terminal of described interface circuit connects the waveform input end of scanning power supply; The output terminal of scanning power supply connects the coil on the electromagnet; Described sensor is located in the magnetic field of electromagnet formation;
Described sensor comprises magnetic induction density B test coil and magnetic field intensity H test coil; Described B test coil surrounds annular, leaves the placing space of tested coin in the middle of the annular; The H test coil is close to by the B test coil.
6. coin magnetics characteristic test instrument according to claim 5 is characterized in that described interface circuit is is the circuit of core with the dsp chip; The D/A source end of described dsp chip connects the input end of scanning power supply; Two A/D input ends of dsp chip connect an end that connects B test coil and H test coil respectively, the other end ground connection of B test coil and H test coil.
7. coin magnetics characteristic test instrument according to claim 5 is characterized in that described electromagnet is a C shape, and tested coin is placed between two magnetic pole heads, forms closed magnetic circuit.
8. coin magnetics characteristic test instrument according to claim 5 is characterized in that the diameter of described B test coil is bigger 0.4 millimeter than the diameter of coin; The thickness of B test coil is not more than the thickness of coin; Described H test coil coiling shape is semicircle.
9. coin magnetics characteristic test instrument according to claim 5 is characterized in that described computer is connected with printer and display, as output device.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102749595A (en) * 2012-07-09 2012-10-24 云南电力试验研究院（集团）有限公司电力研究院 Method for measuring residual magnetic induction density of iron core of transformer
CN104375100A (en) * 2013-08-12 2015-02-25 帅立国 Differential type initial permeability material detection probe

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Publication number Priority date Publication date Assignee Title
US6382386B1 (en) * 2000-05-22 2002-05-07 Cashcode Company Inc. Eddy-current sensor for coin evaluation
JP2008293337A (en) * 2007-05-25 2008-12-04 Magune Brain:Kk Coin sensor
CN201242779Y (en) * 2008-05-22 2009-05-20 中钞长城金融设备控股有限公司 Dynamic multi-frequency detector for coin magneto-electric characteristic parameter
CN101770662A (en) * 2008-12-30 2010-07-07 中国印钞造币总公司 Magnetic sensor module for detecting

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6382386B1 (en) * 2000-05-22 2002-05-07 Cashcode Company Inc. Eddy-current sensor for coin evaluation
JP2008293337A (en) * 2007-05-25 2008-12-04 Magune Brain:Kk Coin sensor
CN201242779Y (en) * 2008-05-22 2009-05-20 中钞长城金融设备控股有限公司 Dynamic multi-frequency detector for coin magneto-electric characteristic parameter
CN101770662A (en) * 2008-12-30 2010-07-07 中国印钞造币总公司 Magnetic sensor module for detecting

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102749595A (en) * 2012-07-09 2012-10-24 云南电力试验研究院（集团）有限公司电力研究院 Method for measuring residual magnetic induction density of iron core of transformer
CN102749595B (en) * 2012-07-09 2014-11-26 云南电力试验研究院（集团）有限公司电力研究院 Method for measuring residual magnetic induction density of iron core of transformer
CN104375100A (en) * 2013-08-12 2015-02-25 帅立国 Differential type initial permeability material detection probe

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