CN103544764A - Sensor for recognizing magnetic media - Google Patents
Sensor for recognizing magnetic media Download PDFInfo
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- CN103544764A CN103544764A CN201310416135.1A CN201310416135A CN103544764A CN 103544764 A CN103544764 A CN 103544764A CN 201310416135 A CN201310416135 A CN 201310416135A CN 103544764 A CN103544764 A CN 103544764A
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- 230000005284 excitation Effects 0.000 claims abstract description 61
- 230000006698 induction Effects 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 239000000696 magnetic material Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 description 9
- 239000002184 metal Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010835 comparative analysis Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002463 transducing effect Effects 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The invention discloses a sensor for recognizing magnetic media. The sensor is used for recognizing magnetic media such as magnetic security paper, paper currency, check and magnetic cards, and is characterized by comprising one or a plurality of sensing units and an excitation magnet, wherein the excitation magnet provides different excitation magnetic field directions; and the sensing units are used for detecting the component of leakage magnetic fields of the magnetic media magnetized by the excitation magnet along the magnetic field induction field. The sensor can be used for accurately measuring magnetic performance and distribution of the magnetic media. Compared with a universal magnetic-head sensor, the sensor has higher precision, so that the anti-counterfeiting security level can be improved.
Description
Technical field
The present invention relates to Magnetic Sensor technical field, particularly a kind of for identifying for example magnetic secret paper of magnetic medium, bank note, the sensor of the magnetic such as check and magnetic card.
Background technology
In daily life, the use of magnetic medium is very extensive, is applied to all kinds of false proof and encryptions, such as various magnetic secret papers, bank note, check, magnetic card etc.The mode that existing magnetic sensor reads magnetic medium signal is by applying the stray field of constant exciting field measurement magnetic medium, to identify the true and false of its magnetic signal, such metering system comparatively speaking precision is lower, lawless person is organic taking advantage of easily, the threshold of faking is relatively low, and technological means is relatively ripe.
And the magnetic property of the zones of different of magnetic medium bar is different, false making molecule wants to produce magnetic property and the distribution identical with raw magnetic dielectric material, and its cost and technology are relatively very high.By the present invention program's sensor, can measure magnetic property and the distribution of magnetic medium, thereby can 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
The object of the invention is to provide the sensor that can more accurately identify magnetic medium.
The present invention for achieving the above object, adopts following technical scheme:
For identifying a sensor for magnetic medium, it is characterized in that: the excitation that it comprises the sensing unit that one or two magnetic field induction direction is identical and different exciting field direction is provided; Described sensing unit is for detection of the component along its magnetic field induction direction by the stray field of the magnetized magnetic medium of described excitation.
: described excitation is an electromagnet, and alternating electromagnetic field is provided; A sensing unit is arranged on described electromagnet central opening place.
Another kind of embodiment: described sensor comprises two excitation and two sensing units that exciting field direction is orthogonal, and described two sensing units lay respectively at a side of two excitations.
The third embodiment: described sensor comprises electromagnet, two sensing units and two excitations; The direction of the exciting field that described two excitations provide is mutually vertical, and described electromagnet is in order to provide Alternating Current Excitation field, and two sensing units lay respectively at a side of each excitation, and a sensing unit is positioned at electromagnet central opening place.
It is further characterized in that: described sensing unit comprises one or more magnetic sensor elements, and the magnetic field induction direction of described a plurality of magnetic sensor elements is parallel to each other.
Preferred: the magnetic sensor elements of described sensing unit is the magnetic sensor elements that comprises coil magnetic head, Hall element, anisotropic magnetoresistance element, giant magnetoresistance element or 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 electromagnet, its effective exciting field width is more than or equal to the induction width of magnetic field sensing unit.
Above-mentioned excitation has one deck screen layer outward, an end opening of described screen layer, and opening surface is detection faces, the material of described screen layer is soft magnetic material.
The present invention can accurately measure magnetic property and the distribution of magnetic medium, than general class magnetic head sensor, has higher precision, thereby can improve anti-fake encrpted grade.
Accompanying drawing explanation
Fig. 1 is provided by the invention for identifying the schematic diagram of the first embodiment of magnetic medium sensor;
Fig. 2 is provided by the invention for identifying the schematic diagram of the second embodiment of magnetic medium sensor.
Fig. 3 is provided by the invention for identifying the schematic diagram of the third embodiment of magnetic medium sensor.
Embodiment
Below in conjunction with drawings and Examples, summary of the invention of the present invention is further described.
Embodiment mono-:
What as shown in Figure 1, this embodiment provided comprises sensing unit 11 and electromagnet 13 for identifying the sensor of magnetic medium.Described sensing unit 11 comprises magnetic sensor elements and corresponding circuit, and it is positioned at the intermediate openings place of electromagnet 13.Wherein electromagnet 13 is for providing Alternating Current Excitation field 21 for magnetized medium, and exciting field 21 can be any direction, and this direction can be adjusted according to the shape of excitation 13, and its field intensity size and frequency can decide by controlling the electric current of magnet coil.During work, magnetic medium bar 22 moves below electromagnet 13 and sensing unit 11, electromagnet 13 produces Alternating Current Excitation fields 21 with magnetized medium particle 23, is positioned at stray field 25 that the sensing unit 11 of electromagnet 13 can record magnetic medium particle 23 when 13 pairs of media particles 23 of electromagnet apply Alternating Current Excitation field 21 along the component in its sensitivity field direction 1.The material of different magnetic medium bars is different, its magnetic property is also different, simultaneously, the magnetic property of the zones of different of same magnetic medium bar is also different, by magnetic medium being applied to its magnetic leakage signal of Alternating Current Excitation field measurement, can obtain the output waveform of similar magnetic hysteresis loop, by we can obtain magnetic property and the distribution of magnetic medium material to the analysis and calculation of output waveform, thereby can improve measuring accuracy.
Embodiment bis-:
What as shown in Figure 2, this embodiment provided comprises excitation 14, sensing unit 11, excitation 15 and sensing unit 12 for identifying the sensor of magnetic medium.Described excitation 14,15 is outer one deck screen layer 16, an end opening of described screen layer 16, and opening surface is detection faces, the material of described screen layer is soft magnetic material.Described sensing unit comprises 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 the same side of excitation 14 and excitation 15, excitation 14,15 is for providing exciting field 24,25 with magnetized medium, and exciting field 24,25 is mutually vertical.Excitation can be that permanent magnet can be also electromagnet, the width of its effective exciting field is more than or equal to the induction width of sensing unit, exciting field can be any direction, this direction can be adjusted according to the shape of excitation, if excitation is permanent magnet, the large I of its field intensity determines according to its material, if electromagnet can determine by the size of current of controlling by its coil.During work, magnetic medium bar 22 is first by excitation 14, after the media particle 23 of 24 pairs of magnetic medium bars 22 of exciting field magnetizes, sensing unit 11 is measured along the component of its magnetic field induction direction 1 stray field 26 of media particle 23 again, then magnetic medium bar 22 is by excitation 15,25 pairs of magnetic mediums of exciting field carry out magnetic history again one time, and then sensing unit 12 is measured along the component of its magnetic field induction direction 2 stray field 26 of media particle 23 again.By the sensing units that two magnetic-field-sensitive directions are identical, measure the stray field along the magnetized magnetic medium of different directions, then its two groups of output waveforms of comparative analysis we can obtain magnetic property and the distribution of magnetic medium, thereby can improve measuring accuracy.
Embodiment tri-:
What as shown in Figure 3, this embodiment provided comprises excitation 14, sensing unit 11, excitation 15, sensing unit 12 and electromagnet 13 for identifying the sensor of magnetic medium.Described excitation 14,15 is outer one deck screen layer 16, an end opening of described screen layer 16, and opening surface is detection faces, the material of described screen layer is soft magnetic material.Described sensing unit 11 and sensing unit 12 comprise 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 electromagnet 13 intermediate openings places.Sensing unit 11 and sensing unit 12 lay respectively at the same side of excitation 14 and excitation 15, and excitation 14,15 is for providing exciting field 24,25 with magnetized medium, and exciting field 24,25 is mutually vertical.Excitation can be that permanent magnet can be also electromagnet, the width of its effective exciting field is more than or equal to the induction width of sensing unit, exciting field can be any direction, this direction can be adjusted according to the shape of excitation, if excitation is permanent magnet, the large I of its field intensity determines according to its material, if electromagnet can determine by the size of current of controlling by its coil.During work, magnetic medium bar 22 is first by excitation 14, after the media particle 23 of 24 pairs of magnetic medium bars 22 of exciting field magnetizes, sensing unit 11 is measured along the component of its magnetic field induction direction 1 stray field 26 of media particle 23 again, then magnetic medium bar 22 is by excitation 15, 25 pairs of magnetic mediums of exciting field carry out magnetic history again one time, then medium strip 22 is by electromagnet 13 and sensing unit 12, when 13 pairs of media of electromagnet apply a less Alternating Current Excitation field, the stray field 26 of 12 pairs of media particles 23 of sensing unit is measured along the component of its magnetic field induction direction 2.This embodiment can measure the state of magnetic medium its stray field after the effect of orthogonal exciting field and Alternating Current Excitation field, then by its two groups of output waveforms of comparative analysis, we can obtain magnetic property and the distribution of magnetic medium, thereby improve widely measuring accuracy.
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 mono-, sensing unit 11 is arranged in a skeleton with electromagnet 13; For embodiment bis-, three, sensing unit 11,12 lays respectively in two skeletons, and for embodiment tri-, sensing unit 12 and electromagnet 13 are shared a skeleton.The periphery of skeleton is metal shell, an end opening of metal shell, and one end relative with this opening is detection faces, meanwhile, metal shell is provided with grounding lead pin, for shielding the electromagnetic interference (EMI) except described sensor, and for eliminating static.Described sensing unit 11 and sensing unit 12 are PCB formula or are magnetic transducing integrated circuit (IC) chip.For PCB structure, magnetic sensor elements is connected with corresponding circuit by solder joint, then by output, draws pin and is connected with peripheral circuit, output signal.For magnetic transducing ic core chip sensing unit, magnetic sensor elements is connected on chip with corresponding integrated circuit, draws pin and is connected with peripheral circuit, output signal by output.
Sensing unit in above-mentioned three embodiment adopts and comprises 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, can be also full-bridge.Sensing unit comprises one or more magnetic sensor elements, and the magnetic-field-sensitive direction of a plurality of magnetic sensor elements is identical, and the magnetic field induction direction of embodiment bis-and sensing unit 11,12 in three is identical.
The present invention program can also detect multichannel magnetic medium signal, and wherein each sensing unit contains multichannel magnetic sensor elements.For the first embodiment, multichannel magnetic medium bar is after electromagnet 13 and sensing unit 11, and the magnetic that the logical peripheral micro treatmenting device of multiple signals carries out analysis and calculation multichannel magnetic medium distributes; If what adopt is the second and the third embodiment, multichannel magnetic medium bar is after microscler excitation 14 magnetization, 11 pairs of multichannel magnetic medium bars of sensing unit are measured, then pass through the magnetization of microscler excitation 15, pass through the sensing unit 12 of electromagnet 13 and electromagnet 13 inside, 12 pairs of multichannel magnetic medium bars of sensing unit are measured again.Sensing unit 12 is identical with sensing unit 11, contain multichannel magnetic sensor elements, two magnetic sensor elements wherein measuring same road magnetic medium are one group and export a road signal, and the magnetic that the micro treatmenting device of its output signal by peripheral circuit carries out analysis and calculation multichannel magnetic medium distributes.
Should be appreciated that the above detailed description of technical scheme of the present invention being carried out by preferred embodiment is illustrative and not restrictive.Those of ordinary skill in the art modifies reading the technical scheme that can record each embodiment on the basis of instructions of the present invention, or part technical characterictic is wherein equal to replacement; And these modifications 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. for identifying a sensor for magnetic medium, it is characterized in that: it comprises a sensing unit and excitation; Described excitation is electromagnet, provides Alternating Current Excitation field in order to magnetized magnetic medium; Described sensing unit is arranged on described electromagnet central opening place, for detection of the component along its magnetic field induction direction by the stray field of the magnetized magnetic medium of described excitation.
2. for identifying a sensor for magnetic medium, it is characterized in that: it comprises two sensing unit and two excitations that magnetic field induction direction is identical; Described two excitation providers to orthogonal exciting field in order to magnetized magnetic medium; Described two sensing units lay respectively at a side of two excitations, for detection of the component along its magnetic field induction direction by the stray field of the magnetized magnetic medium of described excitation.
3. for identifying a sensor for magnetic medium, it is characterized in that: it comprises sensing unit that two magnetic field induction directions are identical, two excitations and electromagnet; Described two excitation providers to orthogonal exciting field in order to magnetized magnetic medium; Described electromagnet is in order to provide Alternating Current Excitation field with magnetized magnetic medium; Described two sensing units lay respectively at a side of each excitation, and a sensing unit is positioned at electromagnet central opening place, and described two sensing units are for detection of the component along its magnetic field induction direction by the stray field of the magnetized magnetic medium of described excitation.
According to described in claim 1-3 any one for identifying the sensor of magnetic medium, it is characterized in that: described sensing unit comprises one or more magnetic sensor elements, and the magnetic field induction direction of described a plurality of magnetic sensor elements is parallel to each other.
5. according to claim 4 for identifying the sensor of magnetic medium, it is characterized in that: the magnetic sensor elements of described sensing unit is the magnetic sensor elements that comprises coil magnetic head, Hall element, anisotropic magnetoresistance element, giant magnetoresistance element or magnetic tunnel junction element.
6. according to claim 4 for identifying the sensor of magnetic medium, it is characterized in that: the magnetic sensor elements in described sensing unit is single resistance, half-bridge or full bridge structure.
According to described in claim 2,3 for identifying the sensor of magnetic medium, it is characterized in that: described excitation is permanent magnet or electromagnet, its effective exciting field width is more than or equal to the induction width of magnetic field sensing unit.
According to described in claim 2,3 for identifying the sensor of magnetic medium, it is characterized in that: described excitation has one deck screen layer outward, an end opening of described screen layer, opening surface is detection faces, the material of described screen layer is soft magnetic material.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104021411A (en) * | 2014-05-30 | 2014-09-03 | 江苏多维科技有限公司 | Magnetic anti-counterfeiting mark and identification system thereof |
| 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 |
| CN106570978A (en) * | 2016-11-07 | 2017-04-19 | 中钞特种防伪科技有限公司 | Apparatus used for detecting anti-fake component and method thereof |
| WO2021077672A1 (en) * | 2019-10-21 | 2021-04-29 | 北京工业大学 | Rapid demagnetization method based on characteristics of magnetic medium |
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| CN106570978A (en) * | 2016-11-07 | 2017-04-19 | 中钞特种防伪科技有限公司 | Apparatus used for detecting anti-fake component and method thereof |
| 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 |
| WO2021077672A1 (en) * | 2019-10-21 | 2021-04-29 | 北京工业大学 | Rapid demagnetization method based on characteristics of magnetic medium |
| US11961648B2 (en) | 2019-10-21 | 2024-04-16 | Beijing University Of Technology | Rapid demagnetization method based on characteristics of magnetic media |
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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. |
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