CN103544764B - A kind of sensor for identifying magnetic medium - Google Patents
A kind of sensor for identifying magnetic medium Download PDFInfo
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- CN103544764B CN103544764B CN201310416135.1A CN201310416135A CN103544764B CN 103544764 B CN103544764 B CN 103544764B CN 201310416135 A CN201310416135 A CN 201310416135A CN 103544764 B CN103544764 B CN 103544764B
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- 230000005284 excitation Effects 0.000 claims abstract description 59
- 230000006698 induction Effects 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 10
- 239000000696 magnetic material Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 230000002463 transducing effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
Abstract
The invention discloses a kind of sensor for identifying magnetic medium, be used for identifying magnetic medium such as magnetic secret paper, bank note, the magnetic such as check and magnetic card；It is characterized in that: it includes one or more sensing unit and provides the excitation of different exciting field direction；Described sensing unit for detection by the stray field of the magnetized magnetic medium of described excitation along the component in its magnetic field induction direction.The present invention can accurately measure magnetic property and the distribution of magnetic medium, has higher precision than general class magnetic head sensor, such that it is able to improve anti-fake encrpted grade.
Description
Technical field
The present invention relates to magnetic sensor technologies field, be used for identifying magnetic medium such as magnetic secret paper, bank note, the sensor of the magnetic such as check and magnetic card particularly to one.
Background technology
In daily life, the use of magnetic medium widely, is applied to all kinds of false proof and encryption, the most various magnetic secret papers, bank note, check, magnetic card etc..It is the true and false being identified its magnetic signal by the stray field applying constant exciting field measurement magnetic medium that existing magnetic sensor reads the mode of magnetic medium signal, such metering system precision comparatively speaking is relatively low, lawless person is the most organic to be taken advantage of, the threshold faked is relatively low, technological means relative maturity.
And the magnetic property of the zones of different of magnetic medium bar is different, false making molecule wants to produce the magnetic property identical with raw magnetic dielectric material and distribution, and its cost and technology are relatively the highest.Magnetic property and the distribution of magnetic medium can be measured by the sensor of the present invention program, such that it is able to distinguish more accurately, detect magnetic medium, improve false proof and secret grade.This needs sensor more accurately to identify magnetic medium.
Summary of the invention
Present invention aim at providing the sensor that can more accurately identify magnetic medium.
The present invention for achieving the above object, adopts the following technical scheme that
A kind of sensor for identifying magnetic medium, it is characterised in that: it includes the identical sensing unit in one or two magnetic field induction direction and provides the excitation of different exciting field direction；Described sensing unit for detection by the stray field of the magnetized magnetic medium of described excitation along the component in its magnetic field induction direction.
A kind of embodiment: described excitation is electric magnet, it is provided that alternating electromagnetic field；One sensing unit is arranged at described electric magnet central opening.
Another embodiment: described sensor includes the orthogonal excitation in two exciting field directions and two sensing units, and said two sensing unit lays respectively at the side of two excitations.
The third embodiment: described sensor includes electric magnet, two sensing units and two excitations；The direction of the exciting field that said two excitation provides is mutually perpendicular to, and described electric magnet is in order to provide Alternating Current Excitation field, and two sensing units lay respectively at the side of each excitation, and a sensing unit is positioned at electric magnet central opening.
It is further characterized by described sensing unit and includes one or more magnetic sensor elements, and the magnetic field induction direction of the plurality of magnetic sensor elements is parallel to each other.
Preferred: the magnetic sensor elements of described sensing unit is to include coil magnetic head, Hall element, anisotropic magnetoresistance element, giant magnetoresistance element or the magnetic sensor elements of magnetic tunnel junction element.
Magnetic sensor elements in described sensing unit is single resistance, half-bridge or full bridge structure.
In second and third kind of embodiment: described excitation is permanent magnet or electric magnet, its effective exciting field width is more than or equal to the sensing width of magnetic field sensing cell.
Having one layer of screen layer, the one end open of described screen layer outside above-mentioned excitation, opening surface is detection faces, and the material of described screen layer is soft magnetic materials.
The present invention can accurately measure magnetic property and the distribution of magnetic medium, has higher precision than general class magnetic head sensor, such that it is able to improve anti-fake encrpted grade.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the first embodiment for identifying magnetic medium sensor that the present invention provides；
Fig. 2 is the schematic diagram of the second embodiment for identifying magnetic medium sensor that the present invention provides.
Fig. 3 is the schematic diagram of the third embodiment for identifying magnetic medium sensor that the present invention provides.
Detailed description of the invention
Below in conjunction with the accompanying drawings and the summary of the invention of the present invention is further described by embodiment.
Embodiment one:
As it is shown in figure 1, this embodiment provide for identifying that the sensor of magnetic medium includes sensing unit 11 and electric magnet 13.Described sensing unit 11 includes magnetic sensor elements and corresponding circuit, and it is positioned at the intermediate openings of electric magnet 13.Wherein electric magnet 13 is used for providing Alternating Current Excitation field 21 for magnetized medium, and exciting field 21 can be any direction, and this direction can adjust according to the shape of excitation 13, and its field intensity size and frequency can determine by controlling the electric current of electromagnet coil.During work, magnetic medium bar 22 is at electric magnet 13 and the moved beneath of sensing unit 11, electric magnet 13 produces Alternating Current Excitation field 21 can record the stray field 25 of magnetic medium granule 23 component along its sensitivity field direction 1 with magnetized medium granule 23, the sensing unit 11 being positioned at electric magnet 13 while electric magnet 13 applies Alternating Current Excitation field 21 to media particle 23.The material of different magnetic medium bars is different, its magnetic property is the most different, simultaneously, the magnetic property of the zones of different of same magnetic medium bar is the most different, the output waveform of similar hysteresis curve can be obtained by magnetic medium being applied its magnetic leakage signal of Alternating Current Excitation field measurement, by to the analysis of output waveform with calculate us and can obtain magnetic property and the distribution of magnetic medium material, such that it is able to improve certainty of measurement.
Embodiment two:
As in figure 2 it is shown, this embodiment provide for identifying that the sensor of magnetic medium includes excitation 14, sensing unit 11, excitation 15 and sensing unit 12.Having one layer of screen layer 16, the one end open of described screen layer 16 outside described excitation 14,15, opening surface is detection faces, and the material of described screen layer is soft magnetic materials.Described sensing unit includes magnetic sensor elements and corresponding circuit, the magnetic field induction direction 1,2 of two sensing units is identical, sensing unit 11 and sensing unit 12 lay respectively at excitation 14 and the same side of excitation 15, excitation 14,15 is used for providing exciting field 24,25 to be mutually perpendicular to magnetized medium, exciting field 24,25.Excitation can be permanent magnet can also be electric magnet, the width of its effective exciting field is more than or equal to the sensing width of sensing unit, exciting field can be any direction, this direction can adjust according to the shape of excitation, if excitation is permanent magnet, the big I of its field intensity determines according to its material, if electric magnet, can be by controlling the size of current decision by its coil.During work, magnetic medium bar 22 first passes through excitation 14, after the media particle 23 of magnetizing mediums bar 22 is magnetized by exciting field 24, the stray field 26 of media particle 23 is measured by sensing unit 11 again along the component in its magnetic field induction direction 1, then magnetic medium bar 22 is by excitation 15, exciting field 25 carries out a magnetic history again to magnetic medium, and then the stray field 26 of media particle 23 is measured by sensing unit 12 again along the component in its magnetic field induction direction 2.Measure the stray field along the magnetized magnetic medium of different directions by the sensing unit that two magnetic-field-sensitive directions are identical, then its two groups of output waveforms of relative analysis we can obtain magnetic property and the distribution of magnetic medium, such that it is able to improve certainty of measurement.
Embodiment three:
As it is shown on figure 3, this embodiment provide for identifying that the sensor of magnetic medium includes excitation 14, sensing unit 11, excitation 15, sensing unit 12 and electric magnet 13.Having one layer of screen layer 16, the one end open of described screen layer 16 outside described excitation 14,15, opening surface is detection faces, and the material of described screen layer is soft magnetic materials.Described sensing unit 11 and sensing unit 12 include magnetic sensor elements and corresponding circuit, and the magnetic field induction direction 1,2 of two sensing units is identical, and a sensing unit 12 is positioned at electric magnet 13 intermediate openings.Sensing unit 11 and sensing unit 12 lay respectively at excitation 14 and the same side of excitation 15, and excitation 14,15 is used for providing exciting field 24,25 to be mutually perpendicular to magnetized medium, exciting field 24,25.Excitation can be permanent magnet can also be electric magnet, the width of its effective exciting field is more than or equal to the sensing width of sensing unit, exciting field can be any direction, this direction can adjust according to the shape of excitation, if excitation is permanent magnet, the big I of its field intensity determines according to its material, if electric magnet, can be by controlling the size of current decision by its coil.During work, magnetic medium bar 22 first passes through excitation 14, after the media particle 23 of magnetizing mediums bar 22 is magnetized by exciting field 24, the stray field 26 of media particle 23 is measured by sensing unit 11 again along the component in its magnetic field induction direction 1, then magnetic medium bar 22 is by excitation 15, exciting field 25 carries out a magnetic history again to magnetic medium, then medium strip 22 is by electric magnet 13 and sensing unit 12, while electric magnet 13 applies a less Alternating Current Excitation field to medium, the stray field 26 of media particle 23 is measured by sensing unit 12 along the component in its magnetic field induction direction 2.This embodiment can measure magnetic medium state of its stray field after the effect of orthogonal exciting field and Alternating Current Excitation field, then by its two groups of output waveforms of relative analysis, we can obtain magnetic property and the distribution of magnetic medium, thus greatly improves certainty of measurement.
Sensor described in the present embodiment has skeleton and metal shell, and the material of described skeleton and metal shell is non magnetic wear-resistant material.For embodiment one, sensing unit 11 and electric magnet 13 are arranged in a skeleton；For embodiment two, three, sensing unit 11,12 lays respectively in two skeletons, shares a skeleton for embodiment three, sensing unit 12 and electric magnet 13.The periphery of skeleton is metal shell, the one end open of metal shell, and one end relative with this opening is detection faces, and meanwhile, metal shell is provided with grounding lead pin, for shielding electromagnetic interference in addition to described sensor, and is used for eliminating electrostatic.Described sensing unit 11 and sensing unit 12 are PCB formula or are magnetic transducing IC chip.For PCB construction, magnetic sensor elements is connected with corresponding circuit by solder joint, then draws pin by output and be connected with peripheral circuit, output signal.For magnetic transducing ic core chip sensing unit, magnetic sensor elements has connected on chip with corresponding integrated circuit, draws pin by output and is connected with peripheral circuit, output signal.
Sensing unit in above three embodiment uses and includes the magnetic sensor elements such as coil magnetic head, Hall element, anisotropic magnetoresistance element, giant magnetoresistance element or magnetic tunnel junction element.Described magnetic sensor elements can be single resistance, can be half-bridge, it is also possible to be full-bridge.Sensing unit comprises one or more magnetic sensor elements, and the magnetic-field-sensitive direction of multiple magnetic sensor elements is identical, and embodiment two is identical with the magnetic field induction direction of the sensing unit 11,12 in three.
The present invention program can also detect multichannel magnetic medium signal, and the most each sensing unit contains multichannel magnetic sensor elements.For the first embodiment, multichannel magnetic medium bar is after electric magnet 13 and sensing unit 11, and the logical peripheral micro treatmenting device of multiple signals is analyzed and calculates the magnetic distribution of multichannel magnetic medium；If using the second and the third embodiment, multichannel magnetic medium bar is after elongated excitation 14 magnetization, multichannel magnetic medium bar is measured by sensing unit 11, it is then passed through the magnetization of elongated excitation 15, again through the sensing unit 12 within electric magnet 13 and electric magnet 13, multichannel magnetic medium bar is measured by sensing unit 12.Sensing unit 12 is identical with sensing unit 11, containing multichannel magnetic sensor elements, wherein measuring two magnetic sensor elements of same road magnetic medium to be one group and export a road signal, its output signal is analyzed by the micro treatmenting device of peripheral circuit and calculates the magnetic distribution of multichannel magnetic medium.
Should be appreciated that above is illustrative and not restrictive by preferred embodiment to the detailed description that technical scheme is carried out.Technical scheme described in each embodiment can be modified on the basis of reading description of the invention by those of ordinary skill in the art, or wherein portion of techniques feature is carried out equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1. the sensor being used for identifying magnetic medium, it is characterised in that: it includes a sensing unit and excitation；Described excitation is electric magnet, it is provided that Alternating Current Excitation field is in order to magnetized magnetic medium；Described sensing unit is arranged at described electric magnet central opening, for detection by the stray field of the magnetized magnetic medium of described excitation along the component in its magnetic field induction direction.
2. one kind for identifying the sensor of magnetic medium, it is characterised in that: it includes the identical sensing unit in two magnetic field induction directions and two excitations；Said two excitation provides the orthogonal exciting field in direction in order to magnetized magnetic medium successively；Said two sensing unit lays respectively at the side of two excitations, for detecting the most respectively by the stray field of the sensing unit front end magnetized magnetic medium of excitation along the component in its magnetic field induction direction.
3. the sensor being used for identifying magnetic medium, it is characterised in that: it includes sensing unit, two excitations and the electric magnet that two magnetic field induction directions are identical；Said two excitation provides the orthogonal exciting field in direction in order to magnetized magnetic medium；Described electric magnet is in order to provide Alternating Current Excitation field with magnetized magnetic medium；Said two sensing unit lays respectively at the side of each excitation, and a sensing unit is positioned at electric magnet central opening, said two sensing unit for detection by the stray field of the magnetized magnetic medium of described excitation along the component in its magnetic field induction direction.
4. according to the sensor for identifying magnetic medium described in any one of claim 1-3, it is characterised in that: described sensing unit includes one or more magnetic sensor elements, and the magnetic field induction direction of the plurality of magnetic sensor elements is parallel to each other.
Sensor for identifying magnetic medium the most according to claim 4, it is characterised in that: the magnetic sensor elements of described sensing unit is to include coil magnetic head, Hall element, anisotropic magnetoresistance element, giant magnetoresistance element or the magnetic sensor elements of magnetic tunnel junction element.
Sensor for identifying magnetic medium the most according to claim 4, it is characterised in that: the magnetic sensor elements in described sensing unit is single resistance, half-bridge or full bridge structure.
7. according to the sensor for identifying magnetic medium described in Claims 2 or 3, it is characterised in that: described excitation is permanent magnet or electric magnet, and its effective exciting field width is more than or equal to the sensing width of magnetic field sensing cell.
8. according to the sensor for identifying magnetic medium described in Claims 2 or 3, it is characterised in that: having one layer of screen layer, the one end open of described screen layer outside described excitation, opening surface is detection faces, and the material of described screen layer is soft magnetic materials.
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| CN201310416135.1A CN103544764B (en) | 2013-09-12 | 2013-09-12 | A kind of sensor for identifying magnetic medium |
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| CN201310416135.1A CN103544764B (en) | 2013-09-12 | 2013-09-12 | A kind of sensor for identifying magnetic medium |
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| CN103544764B true CN103544764B (en) | 2016-11-16 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104021411B (en) * | 2014-05-30 | 2017-11-24 | 江苏多维科技有限公司 | A kind of magnetic anti-counterfeiting mark and its identifying system |
| CN105093135A (en) * | 2015-06-25 | 2015-11-25 | 无锡乐尔科技有限公司 | Evaluation method for magnetic head and magnetic medium |
| CN106570978B (en) * | 2016-11-07 | 2019-06-21 | 中钞特种防伪科技有限公司 | The device and method that a kind of pair of Security element is detected |
| CN110797052B (en) * | 2019-10-21 | 2021-10-01 | 北京工业大学 | Rapid demagnetization method based on magnetic medium characteristics |
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Effective date of registration: 20191223 Address after: 233000 Room 228, 2nd Floor, West Building, City Gate Building, Bengbu City, Anhui Province Patentee after: Bengbu Ximag Technology Co.,Ltd. Address before: 204, room 214028, Science Park, block 34, 7 Changjiang Road, Wuxi New District, Jiangsu, China Patentee before: WUXI LER TECHNOLOGY Co.,Ltd. |
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Address after: Xici Technology Industrial Park, No. 321 Taibo Road, Sensing Valley C District, Bengbu Economic Development Zone, Anhui Province, 233060 Patentee after: Anhui Xici Technology Co.,Ltd. Address before: Room 228, 2nd Floor, West Building, Chengzhimen Building, Bengbu City, Anhui Province, 233000 Patentee before: Bengbu Ximag Technology Co.,Ltd. |