CN103116937B - Automatic teller machine and quantization authenticity identification method - Google Patents
Automatic teller machine and quantization authenticity identification method Download PDFInfo
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- CN103116937B CN103116937B CN201310024734.9A CN201310024734A CN103116937B CN 103116937 B CN103116937 B CN 103116937B CN 201310024734 A CN201310024734 A CN 201310024734A CN 103116937 B CN103116937 B CN 103116937B
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Abstract
Disclosed are an automatic teller machine and a quantization authenticity identification method. The automatic teller machine comprises a detection unit used for identification and detection of paper currency authenticity and composed of a sensor, a processing unit and a displaying unit. The sensor is arranged to be a magnetic sensor which comprises a magnet and a magnet sensitive element. The magnet sensitive element responds to magnetic code field generated by a magnetic code of magnetized paper currency by a magnet, the magnetic code is magnetized by the magnet when passing the surface if the magnet sensor to finish a complete or partial hysteresis circuit line process, the magnet sensor reads signals of a corresponding magnetization process, the signals of the magnet sensor are transmitted to the processing unit, results of the processing unit are displayed through the displaying unit. The automatic teller machine and the quantization authenticity identification method can distinguish magnetic code property and quantize hysteresis circuit line characters of the magnet code, and are insensitive to detection clearance without depending on strength of magnetic codes, and high in identification accuracy and good in identification stability.
Description
Technical field
The present invention relates to financial magnetic authentication detection technology field, particularly relate to a kind of ATM (Automatic Teller Machine) and quantize authenticity method.
Background technology
Currency is one of circulation market indispensable element, in order to ensure stablizing of financial circulation order, need to carry out the discriminating of the currency true and false.
Because currency is in printing process, can arranges and be distributed with a plurality of magnetic codes.Carry out the check of the currency true and false by checking these magnetic code features to carry out.In prior art, the mode that ATM (Automatic Teller Machine) detects magnetic code feature is magnetic and detects and optical characteristics detection two large classes.
Magnetic false distinguishing detects because the advantages such as its quick machine examination easy to detect are widely used in currency.At present, financial magnetic false distinguishing has become one of the requisite means of the stable institute of financial circulation order of safeguarding.
The principle of magnetic false distinguishing is that the magnetic pin to arranging in currency detects, and comprises the features such as magnetic field intensity and position distribution.Along with the progress of technology, financial magnetic authentication detection technology has experienced by currency examine speed and the too responsive inductive coil of detection spacing are developed into comparatively advanced Hall magnetic resistance.Yet Hall magnetic resistance low-intensity magnetic field reluctivity is extremely low, add that its evaluation program need to depend on magnetic code signal intensity, thereby require to there is minimum detector gap, be conventionally less than 0.1mm.Signal is changed and other affect the factor of signal intensity and unstable with gap, easily occur that card paper money rate is high, rate of wear large and press coin wheel because of the pressure series of problems such as easy fracture greatly.
In addition, Hall magnetic resistance cannot simply easily be distinguished soft magnetism and Hard Magnetic because of it to magnetic direction response is symmetrical, as shown in Figure 1, and more fubaritic full hysteresis loop line feature.Can only according to the geometry mechanical property of magnetic code, judge with strong and weak absolute value or the ratio attempted with different magnetic code signals unilaterally, cause, on affecting strong dependency and the uncertainty to the strong and weak judgement of signal of magnetic code signal intensity factor, cannot being competent at by the magnetic characteristic of comprehensive evaluation magnetic code thoroughly false proof important task.Fact proved, Hall magnetic resistance cannot be differentiated the new edition counterfeit money occurring in recent years.
Moreover the Hall magnetic resistance in leading market cannot be avoided adjacent closely spaced magnetic code signal stack at present, causes the complicated of evaluation program.
In science and technology highly developed today, the magnetic field size and location of the true magnetic code of not so difficult forgery distribute, and uncertainty as above while adding conventional art judgement brings challenges to magnetic code false distinguishing.
Therefore, need to provide and can differentiate the ATM (Automatic Teller Machine) of the more technical characterictics of currency and quantize authenticity method.And in fact, unless known Yin Chao producer magnetic code formula and manufacturing process, want to copy completely whole magnetic hysteresis loop features very difficult really of all a plurality of true magnetic codes.Therefore, false distinguishing can not simply lean on comparison magnetic code magnetic field size and location to distribute completely, more require ATM (Automatic Teller Machine) can qualitative and quantitatively identify soft or hard magnetic attribute and the magnetic hysteresis loop feature of magnetic code, to guarantee the stability of signal judgement and the uncertainty of reduction authentication method.
Therefore, not enough for prior art, provided a kind of ATM (Automatic Teller Machine) and bank note to quantize authenticity method very necessary.
Summary of the invention
One of object of the present invention is to avoid weak point of the prior art and a kind of ATM (Automatic Teller Machine) is provided, and this ATM (Automatic Teller Machine) can completely be distinguished the feature of the magnetic hysteresis loop that a plurality of magnetic pins of currency setting have separately and accurately identify the currency true and false.
Above-mentioned purpose of the present invention realizes by following technical measures.
A kind of ATM (Automatic Teller Machine) is provided, be provided with the verification unit of forge or true or paper money being distinguished to detection, described verification unit is provided with sensor, processing unit and display unit, sensor gathers and Information Monitoring is delivered to processing unit the signal of bank note, after treated cell processing, being sent to display unit shows, described sensor setting is Magnetic Sensor, described Magnetic Sensor is provided with magnet and magnet-sensitive element, described magnet-sensitive element to described magnet when the magnetization bank note magnetic code and the magnetic code magnetic field producing responds, magnetic code is completed magnetic hysteresis loop process complete or part when through Magnetic Sensor surface by described magnet magnetization, and identified again by the signal that Magnetic Sensor reads corresponding magnetic history.
Above-mentioned magnet is set to strip, the transverse width W of described magnet is no more than 2/3rds of minimum magnetic code spacing gap, the south poles of described magnet is perpendicular to magnetic induction direction and the magnetic inductor plane of Magnetic Sensor, and transverse field strength can allow magnetic code when along horizontal process Magnetic Sensor, experience part or all of magnetic hysteresis loop process.
Above-mentioned magnet is set to permanent magnet, DC coil, AC coil or electromagnet.
Above-mentioned magnet-sensitive element is comprised of two or four magnetic susceptibility unit, and specification identical but response asymmetry in described magnetic susceptibility unit is in magnetic direction, and when described magnet-sensitive element is two, two described magnet-sensitive elements form Hui Sitong half-bridge circuits; When described magnet-sensitive element is set to four, four described magnetic susceptibility cell formation Hui Sitong full-bridge circuits;
Described Hui Sitong half-bridge circuit or described Hui Sitong full-bridge circuit are symmetrically distributed in described magnet centerline both sides along magnetic induction direction, and transverse width W and described center distance that the center distance d0 that forms the described magnetic susceptibility unit of described Hui Sitong half-bridge circuit or described Hui Sitong full-bridge is less than or equal to described magnet are no more than 2/3rds of minimum magnetic code spacing gap.
The magnetic responsiveness of above-mentioned magnetic susceptibility unit is not asymmetric or antisymmetry to magnetic direction, and the magnetic susceptibility unit that is arranged in magnet centerline one side from opposite side magnetic susceptibility unit, same magnetic direction is had to contrary or different responses;
The magnetic direction that described in each, magnetic susceptibility unit detects is identical or contrary along the direction of magnet transverse shifting with magnetic code.
Above-mentioned magnetic susceptibility unit is set to the asymmetric or antisymmetry of magnetic direction response, includes but not limited to inductive coil, giant magnetoresistance, tunnel magnetoresistive, with different magnetoresistive film or device, fluxgate or the superconduction heterojunction of barber shop's formula conductive stripe.
Another object of the present invention is to avoid weak point of the prior art and a kind of quantification authenticity method that adopts above-mentioned magnetic ATM (Automatic Teller Machine) to carry out bank note is provided.
Above-mentioned purpose of the present invention realizes by following technical measures.
Provide the above-mentioned ATM (Automatic Teller Machine) of a kind of employing to carry out bank note and quantize authentication method, magnetic code is completed magnetic hysteresis loop process complete or part when through described Magnetic Sensor surface by described magnet magnetization, and read the signal of corresponding magnetic history and then the magnetic hysteresis loop feature of magnetic code is identified by Magnetic Sensor, the information conveyance that Magnetic Sensor obtains, to processing unit, is delivered to display unit after treated cell processing and shows.
The above-mentioned magnetic hysteresis loop feature to magnetic code is identified and is comprised that magnetic code soft or hard magnetic characteristic is identified and coercive force, square degree and the reversing magnetic field of quantification definition magnetic code distribute.
Above-mentioned magnetic code soft or hard magnetic characteristic identifies according to the signal of single magnetic code, whether to be specifically that single monolateral peak judges whether magnetic code is the Hard Magnetic that coercive force is greater than magnetic field of magnets;
The peak-to-peak wave amplitude ratio of different ripples that the coercive force of described quantification definition magnetic code specifically calculates each single magnetic code signal that described magnetic susceptibility unit senses is weighed and is quantized to define the coercitive size of magnetic code;
Described quantification definition magnetic code magnetic hysteresis loop square degree and reversing magnetic field distribution characteristics, specifically calculate the ratio between each section of time width of single magnetic code signal waveform sensing, and with this ratio, weigh and quantize to define square degree and the reversing magnetic field distribution of this magnetic code magnetic hysteresis loop.
The detailed process that magnetic code soft or hard magnetic characteristic is identified is: when a monolateral signal peak only appears in the shown signal of single magnetic code, identify that magnetic code is the Hard Magnetic that coercive force is greater than magnetic field of magnets; Otherwise be accredited as soft magnetism;
The coercitive detailed process that quantizes definition magnetic code is:
When there is two crests, the peak value at a rear peak has reflected that divided by the resulting ratio of peak value at previous peak magnetic code forward rectifys stupid size; Ratio be 1 o'clock corresponding to magnetic code coercive force, be zero, ratio is 0 o'clock, now only has a peak, corresponding to magnetic code coercive force is greater than magnet maximum transversal magnetic field, cannot be reversed by magnetic field of magnets; The corresponding wave amplitude ratio of marginal coercive force is between 1 and 0, and the less wave amplitude of coercive force ratio is more close to 1, coercive force more wave amplitude ratio more close to 0;
When there is three crests, the peak value at first peak has reflected the coercitive size of magnetic code negative sense divided by the resulting ratio of peak value at second peak simultaneously, and the less ratio of coercive force is more close to 0, coercive force more ratio more close to 1; The peak value at the 3rd peak has reflected that divided by the resulting ratio of peak value at second peak magnetic code forward rectifys stupid size, and the less wave amplitude of coercive force ratio is more close to 1, coercive force more wave amplitude ratio more close to 0;
Quantize definition magnetic code magnetic hysteresis loop square degree and reversing magnetic field distribution characteristics specifically:
When waveform is interval, width ratio is calculated according to the shown signal of each single magnetic code;
When only having a signal peak, magnetic code is the Hard Magnetic that magnet cannot reverse, and can not identify that reversing magnetic field distributes; Square degree is for this peak is fallen after rise to mistiming of peak value 90% and wide ratio of this peak width time by peak value;
When there are two or three signal peaks, penultimate peak is square metric by peak value to the ratio that falls 90% time and this peak half-peak breadth after rise; Similarly, the peak value at available penultimate peak is that reversing magnetic field distributes by the ratio that falls 50% half-peak breadth to the mistiming of making zero and this peak after rise.
ATM (Automatic Teller Machine) of the present invention, be provided with Magnetic Sensor, Magnetic Sensor is provided with magnet and magnet-sensitive element, the magnetic code magnetic field that described magnet-sensitive element produces during to described magnet magnetization bank note responds, magnetic code is completed magnetic hysteresis loop process complete or part through Magnetic Sensor when surface by described magnet magnetization, and is identified by the signal that Magnetic Sensor reads corresponding magnetic history again.ATM (Automatic Teller Machine) of the present invention is carried out forge or true or paper money authentication method, magnetic code is completed magnetic hysteresis loop process complete or part through Magnetic Sensor when surface by described magnet magnetization, and is read the signal of corresponding magnetic history and then the magnetic hysteresis loop feature of magnetic code is identified by Magnetic Sensor.The present invention can distinguish magnetic code soft or hard magnetic attribute can quantize to define the magnetic hysteresis loop feature of magnetic code, thereby it is insensitive to detector gap not rely on the power of magnetic code signal, therefore have the advantages that to identify that degree of accuracy is high and identify good stability.
Accompanying drawing explanation
The invention will be further described to utilize accompanying drawing, but content in accompanying drawing does not form any limitation of the invention.
Fig. 1 is by Hard Magnetic and soft magnetism signal schematic representation that the nondistinctive Hall magnetoresistive transducer of magnetic direction is read.
Fig. 2 is the structural representation of the Magnetic Sensor embodiment 1 of a kind of ATM (Automatic Teller Machine) of the present invention.
Fig. 3 is the affect schematic diagram of the transverse width of magnet on signal stack.
Fig. 4 is that Hard Magnetic or soft magnetism magnetic code experience the schematic diagram in magnetic history path during laterally through magnet.
Fig. 5 is that the coercive force Hard Magnetic magnetic code that cannot be overcome by magnet and coercive force are zero the soft magnetism magnetic code signal schematic representation during Magnetic Sensor by described in the embodiment of the present invention one from left to right.
Fig. 6 identifies resulting signal schematic representation by the Magnetic Sensor of ATM (Automatic Teller Machine) of the present invention to a magnetic code.
Fig. 7 identifies resulting signal schematic representation by the Magnetic Sensor of ATM (Automatic Teller Machine) of the present invention to a magnetic code.
Fig. 8 is that one group of magnetic code is through the resulting one group of magnetic code signal graph of Magnetic Sensor of ATM (Automatic Teller Machine) of the present invention.
Fig. 9 carries out the signal table of discriminatory analysis to one group of magnetic code signal shown in Fig. 8.
Figure 10 is the schematic diagram that the transverse magnetic field of the Magnetic Sensor magnet used of ATM (Automatic Teller Machine) of the present invention changes with distance and detector gap.
At Fig. 2, comprise:
Embodiment
The invention will be further described with the following Examples.
A kind of ATM (Automatic Teller Machine), be provided with the verification unit of forge or true or paper money being distinguished to detection, verification unit is provided with sensor, processing unit and display unit, sensor gathers and Information Monitoring is delivered to processing unit the signal of bank note, is sent to display unit and shows after treated cell processing.Sensor setting is Magnetic Sensor.
As shown in Figure 2, Magnetic Sensor is provided with matrix 1, shell 2, wheatstone bridge circuits interface 3, magnet-sensitive element 4 and magnet 5.
The transverse width W of magnet 5 is no more than 2/3rds of minimum magnetic code spacing gap.Minimum magnetic code spacing gap is general knowledge known in this field, and the distance between two adjacent magnetic codes is magnetic code spacing gap, and the spacing gap in all magnetic code spacing gaps between adjacent two magnetic codes of numerical value minimum is minimum magnetic code spacing gap.The setting of the transverse width of magnet 5 is for fear of the stack of contiguous magnetic code signal, to cause distortion or the change of single magnetic code signal, to facilitate the evaluation of signal and to improve the accuracy to input.
As shown in Figure 3, the transverse width that has shown magnet 5 impact that stack causes on signal, therefrom can find out, adjacent magnetic code gap is at least greater than 1.5 times of magnet width just can avoid signal overlap.
The south poles of magnet 5 is perpendicular to magnetic induction direction and the magnetic inductor plane of Magnetic Sensor, and transverse field strength can allow magnetic code when along horizontal process Magnetic Sensor, experience part or all of magnetic hysteresis loop process.
Magnet-sensitive element 4 is symmetrically distributed in the both sides of magnet 5 center lines.Between magnet-sensitive element 4 centers, apart from representing with normal pitch d0, normal pitch d0 is no more than the transverse width W of magnet 5.
Magnet-sensitive element 4 is by two magnetic susceptibility cell formations.Two magnetic susceptibility unit specifications are identical, two magnetic susceptibility cell formation Hui Sitong half-bridge circuits; Two magnetic susceptibility unit are symmetrically distributed in magnet 5 center line both sides along magnetic induction direction, and the normal pitch between two magnetic susceptibility unit centers is less than or equal to the transverse width W of magnet 5 and is no more than 2/3rds of minimum magnetic code gap.
Concrete, the magnetic responsiveness of magnetic susceptibility unit is asymmetric or antisymmetry to magnetic direction, and the magnetic susceptibility unit that is arranged in magnet 5 center line one sides from opposite side magnetic susceptibility unit, same magnetic direction is had to contrary or different responses.
The magnetic direction that described in each, magnetic susceptibility unit detects is identical or contrary along the direction of magnet 5 transverse shiftings with magnetic code.
Magnetic susceptibility unit is set to inductive coil, giant magnetoresistance, tunnel magnetoresistive or with different magnetoresistive film or the device of barber shop's formula conductive stripe.It should be noted that, magnetic susceptibility unit is not limited to above-mentioned form, can be also fluxgate, superconduction heterojunction etc.
Wherein, there are difference or contrary response in 4 pairs of different directions magnetic fields of magnet-sensitive element, can be magnetic induction coil, giant magnetoresistance, tunnel magnetoresistive or with different magnetoresistive film chip or the device of barber shop's lamp formula bus.
ATM (Automatic Teller Machine) of the present invention, adopt Magnetic Sensor, when magnetic code is completed magnetic hysteresis loop process complete or part when through Magnetic Sensor surface by magnet magnetization, and read the signal of corresponding magnetic history and then identify by Magnetic Sensor, the information conveyance of Magnetic Sensor, to processing unit, shows true and false result after treated cell processing by display unit.
By this Magnetic Sensor, can carry out magnetic hysteresis loop feature to each magnetic code of currency and read, make currency false distinguishing more comprehensive and more accurate.
The Magnetic Sensor of ATM (Automatic Teller Machine) of the present invention, can by reduce the transverse width of magnet and normal pitch to be no more than minimum magnetic code gap 2/3rds and effectively avoid the stack of contiguous magnetic code signal, thereby can analyze separately single magnetic code signal, to qualification process, bring convenience.
The Magnetic Sensor of ATM (Automatic Teller Machine) of the present invention, can distinguish magnetic code and belong to soft magnetism or Hard Magnetic; Can quantize to define magnetic hysteresis loop feature, comprise that coercive force, square degree, reversing magnetic field distribute, and the slope of other each segment of magnetic hysteresis loop; Its determination methods is for the magnetic hysteresis loop feature of each independent magnetic code itself, thus the power that does not rely on magnetic code signal, can break away to greatest extent magnetic field with the constraint of range attenuation.Solved series of problems such as requiring minimum detector gap, card paper money, roller fracture, bank note wearing and tearing, fold, angle and temperature drift.
Due to above-mentioned beneficial effect, the present invention identifies precisely.To whole magnetic codes in bank note, criterion can be implemented to quantize, counterfeit money can be effectively checked and prevent.
In addition, this ATM (Automatic Teller Machine) is simple in structure, easy to use, is not only suitable for currency authenticity, and the authenticity of other article such as applicable check.
An ATM (Automatic Teller Machine), other structures difference identical with embodiment 1 is: magnet-sensitive element is by four magnetic susceptibility cell formations.Four magnetic susceptibility unit specifications are identical, four magnetic susceptibility cell formation Hui Sitong half-bridge circuits; Four magnetic susceptibility unit are symmetrically distributed in magnet centerline both sides along magnetic induction direction, and the normal pitch between its magnetic susceptibility unit center is less than or equal to the transverse width W of magnet and is no more than 2/3rds of minimum magnetic code gap.
By the Magnetic Sensor of this ATM (Automatic Teller Machine), can read the magnetic hysteresis loop feature of each magnetic code of currency, make currency false distinguishing more accurate.
A kind of ATM (Automatic Teller Machine) of above-described embodiment 1 or 2 that adopts is carried out bank note quantification authenticity method, magnetic code is completed magnetic hysteresis loop process complete or part when through Magnetic Sensor surface by described magnet magnetization, and identified by the signal that Magnetic Sensor reads corresponding magnetic history, the information conveyance that Magnetic Sensor obtains, to processing unit, is delivered to display unit after treated cell processing and shows.
Evaluation comprises that the coercive force of definition magnetic code is identified, quantized to magnetic code soft or hard magnetic characteristic, quantification defines the square degree of magnetic code and quantizes definition reversing magnetic field and distributes.
Wherein, magnetic code soft or hard magnetic characteristic identifies whether be is that single monolateral peak judges whether magnetic code belongs to Hard Magnetic or soft magnetism according to the signal of single magnetic code.Crest quantity method specifically judges according to the shown signal peak quantity of each single magnetic code.When only occurring that a monolateral signal peak represents that magnetic code is cannot be by the Hard Magnetic of magnet reverse magnetization direction, and the plus or minus of crest represents that magnetic code direction of magnetization responds to positive flux field opposite direction or identical with the magnet-sensitive element of process first; If there are a plurality of signal peaks, be judged as the soft magnetism that coercive force is less than magnetic field of magnets.
The coercive force that quantizes definition magnetic code specifically calculates the peak-to-peak wave amplitude ratio of different ripples of each single magnetic code signal that magnetic susceptibility unit senses, with this ratio, weighs and quantizes to define the coercitive size of this magnetic code.
When there is two crests, the peak value at a rear peak has reflected that divided by the resulting ratio of peak value at previous peak magnetic code forward rectifys stupid size.Ratio be 1 o'clock corresponding to magnetic code coercive force, be zero, ratio is 0 o'clock, now only has a peak, corresponding to magnetic code coercive force, cannot be reversed by magnetic field of magnets.The corresponding wave amplitude ratio of marginal coercive force is between 1 and 0, and the less wave amplitude of coercive force ratio is more close to 1, coercive force more wave amplitude ratio more close to 0.
When there is three crests, the peak value at first peak has reflected the coercitive size of magnetic code negative sense divided by the resulting ratio of peak value at second peak simultaneously, and the less ratio of coercive force is more close to 0, coercive force more ratio more close to 1.The peak value at the 3rd peak has reflected that divided by the resulting ratio of peak value at second peak magnetic code forward rectifys stupid size, and the less wave amplitude of coercive force ratio is more close to 1, coercive force more wave amplitude ratio more close to 0.
Above-mentioned quantification definition magnetic code magnetic hysteresis loop square degree and reversing magnetic field distribution characteristics, specifically calculate the ratio between each section of time width of single magnetic code signal waveform sensing, and with this ratio, weigh and quantize to define square degree and the reversing magnetic field distribution of this magnetic code magnetic hysteresis loop.
While adopting the waveform of single magnetic code interval, wide ratioing technigue quantizes to identify square degree (Sq=Mr/Ms) and the reversing magnetic field distribution that represents magnetic hysteresis loop feature
.
When waveform is interval, width is than still calculating according to the shown signal of each single magnetic code.
When only having a signal peak, magnetic code is the Hard Magnetic that magnet cannot reverse, and therefore fubaritic reversing magnetic field distributes; The available peak value falling 90% of its square degree and the difference of 100% time of peak value and recently weighing of peak width at half height time.
When there are two or three signal peaks, penultimate peak by peak value to the size that falls 90% the difference of time and the ratio of half-peak breadth after rise and represented square degree, ratio more represents that square degree is larger.And reversing magnetic field distribution SFD can with penultimate peak by fall after rise 50% to make zero with mistiming and the ratio of its half-peak breadth represent, ratio is less represents that SFD is larger.
Particularly, according to measured magnetic code signal, can obtain the formula of reduction of following quantification definition magnetic hysteresis loop feature.
Hc/Hm = 1-(V2/V1)^(1/n) …… (1)
SFD = 2(t0-t50)/tw …… (2)
SQ/SQ0 = （t90-t100/tw …… (3)
Wherein, V2 is the peak value at last peak; V2 is the peak value at last peak; V1 is the peak value at penultimate peak; N is the index of decaying with distance in magnetic code magnetic field, depends on and the sensitivity of magnet-sensitive element, and n is between 1.0 and 3.5 conventionally, and sensitivity more n value is just less; SQ0 is that square degree is wave amplitude and the ratio of halfwidth time at 1 o'clock penultimate peak; T100, t90, the peak value that t50 and t0 are respectively penultimate peak is 100% and falls after rise to 90%, 50%, and the time zero time; Tw is the penultimate peak width time.
Authentication method provided by the present invention, according to the signal reading, adopts the crest quantity method qualitative judgement magnetic code of same single magnetic code whether to belong to Hard Magnetic; Adopt the wave amplitude ratioing technigue of same magnetic code quantize to identify magnetic code coercive force, while adopting the waveform of single magnetic code interval, wide ratioing technigue quantizes to identify square degree (Sq=Mr/Ms) and the reversing magnetic field distribution that represents magnetic hysteresis loop feature
do not rely on the absolute value of magnetic code magnetic field intensity signal, thereby insensitive on affecting the factors such as detector gap, bank note situation, bank note angle, temperature drift, magnet-sensitive element aberrations in property of signal intensity, guaranteed the false distinguishing judgement stability of parameter and the accuracy of judgement.
The present invention can distinguish magnetic code and belong to soft magnetism or Hard Magnetic; Can quantize to define magnetic hysteresis loop feature, comprise the typical magnetic hysteresis loop characteristics such as coercive force, square degree and reversing magnetic field distribution; Its determination methods is for the magnetic hysteresis loop feature of each independent magnetic code itself, thus the power that does not rely on magnetic code signal, can break away to greatest extent magnetic field with the constraint of range attenuation.There is method easy and simple to handle, the accurate feature of result.
Adopt the Magnetic Sensor of ATM (Automatic Teller Machine) of the present invention, by magnetic code, above magnet, process is with experience magnetic history, and the details of magnetic history as shown in Figure 4.Can magnetization details depend on the soft or hard magnetic characteristic of magnetic code and by magnetic field of magnets, be reversed.
The Hard Magnetic magnetic code that can not be inverted, can only experience a local magnetic hysteresis loop magnetic history, the path 1 as shown in Fig. 4 a or path 2.In Fig. 4 a, Hm is magnet maximum transversal magnetic field, and path 1 is point from Mr+ to A, then to Mr+, then to B point, then to Mr+.Path 2 is point from Mr-to C, then to Mr-, then to B point, then to Mr+.The soft magnetism magnetic code that can be inverted, the direction of magnetization of remanent magnetism when initial by magnetic code (Mr+ or Mr-) determines, path 1 as shown in Figure 4 b or path 2.In Fig. 4 b, path 1 is point from Mr+ to A, then to Hc-, then arrive successively B point, C point, B point, Mr-, D point, Hc+, E point, F point, E point, finally arrive Mr+.
Fig. 5 has shown that Hard Magnetic magnetic code that a coercive force cannot be overcome by magnet and coercive force are zero soft magnetism magnetic code from left to right during the ATM (Automatic Teller Machine) by described in the embodiment of the present invention one, signal schematic representation that Magnetic Sensor collects.
As can be seen from the figure, only there is a monolateral crest in Hard Magnetic magnetic code, and sense depends on whether magnetic code remanence direction is identical identical at the next magnetic direction in direction of magnetic code with magnet, and wave amplitude ratio is 0.
Soft magnetism magnetic code demonstrates two crests, and wave amplitude ratio is 1.Thus, can adopt crest recently accurately to express any coercive force between zero and magnetic field of magnets.
By ATM (Automatic Teller Machine) of the present invention, one magnetic code is identified, resulting signal as shown in Figure 6.
As can be seen from the figure, one of signal curve has two peaks, and one has three peaks, therefore can judge that this magnetic code is soft magnetic code.Occur two peaks represent magnetic code remanent magnetism and magnet come to magnetic direction identical; Occur three peaks represent magnetic code remanent magnetism and magnet come to magnetic direction contrary.By corresponding wave amplitude ratio, reflected relevant coercitive size, according to formula (1), can draw coercivity H=1-(V2/V1) ^ (1/n).
Adopt the Magnetic Sensor of ATM (Automatic Teller Machine) of the present invention to identify magnetic code, can identify the specific features of magnetic hysteresis loop, can improve false proof accuracy.
embodiment 7.
By ATM (Automatic Teller Machine) of the present invention, one magnetic code is identified, the resulting signal of Magnetic Sensor as schematically shown in Figure 7.As can be seen from the figure, this magnetic code has two peaks and can judge as soft magnetism.
Ratio by second peak value and first peak value can quantize to obtain coercive force.
The half-peak breadth that first peak is set is tw, and the summit time is t100, and peak value falling to 90% time is t90, and falling to 50% time is t50, and time when falling is extremely zero is t0.
T90, in the difference of t100 time and the ratio of half-peak breadth tw, is obtained to magnetic code square metric, and the larger expression square of ratio degree is better;
Ratio by the difference of return-to-zero-time t0 and half-peak breadth time t50 to half-peak breadth, obtains reversing magnetic field distribution SFD, and ratio is less represents that SFD is larger.And SFD is the description at rollback point Hc place slope.Therefore, between corresponding two peaks, distance has represented SFD divided by half-peak breadth sum.
Visible, by ATM (Automatic Teller Machine) of the present invention and quantification authenticity method of the present invention, can obtain the feature of the magnetic hysteresis loop of single magnetic code.Can carry out Quantitative measurement to the magnetic code in currency, improve false proof accuracy.
embodiment 8.
One group of magnetic code, through ATM (Automatic Teller Machine) of the present invention, obtains one group of magnetic code signal graph as shown in Figure 8.In figure, magnetic code A and magnetic code B seem similar, and its signal is the strong magnetic code C that crosses also.
Form shown in Fig. 9 has been listed signal shown in Fig. 8 is demonstrated and analyzed and provide qualification result with authentication method provided by the present invention.Draw magnetic code B and magnetic code A different, and to seem small and weak magnetic code C be the judgement of Hard Magnetic in fact.This for traditional for Hall magnetic resistance magnetic code technology, be impossible mission.
embodiment 9.
Adopt ATM (Automatic Teller Machine) of the present invention and method to identify magnetic code, as shown in figure 10, with detector gap, increase, magnetic field of magnets weakens, and consequently signal weakens and the reducing of the reversal distance of being correlated with.Therefore, be necessary this to carry out on year-on-year basis or other power side is revised.On year-on-year basis or other power side be modified to general knowledge known in this field, do not repeat them here.
It should be noted that, ATM (Automatic Teller Machine) of the present invention and quantification authenticity method, be not only applicable to financial technology field, goes for other yet and need to sign pseudo-field, as check, magnetic bar code and article anti-counterfeit sign etc.
Finally should be noted that; above embodiment is only for illustrating technical scheme of the present invention but not limiting the scope of the invention; although the present invention is explained in detail with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement technical scheme of the present invention, and not depart from essence and the scope of technical solution of the present invention.
Claims (7)
1. an ATM (Automatic Teller Machine), be provided with the verification unit of forge or true or paper money being distinguished to detection, described verification unit is provided with sensor, processing unit and display unit, sensor gathers and Information Monitoring is delivered to processing unit the signal of bank note, after treated cell processing, being sent to display unit shows, its spy is being: described sensor setting is Magnetic Sensor, described Magnetic Sensor is provided with magnet and magnet-sensitive element, the magnetic code magnetic field that described magnet-sensitive element produces magnetic code in described magnet magnetization bank note responds, magnetic code is completed magnetic hysteresis loop process complete or part when through Magnetic Sensor surface by described magnet magnetization, and identified again by the signal that Magnetic Sensor reads corresponding magnetic history,
Described magnet is set to strip, the transverse width W of described magnet is no more than 2/3rds of minimum magnetic code spacing gap, the south poles of described magnet is perpendicular to magnetic induction direction and the Magnetic Sensor plane of Magnetic Sensor, and transverse field strength can allow magnetic code when along horizontal process Magnetic Sensor, experience part or all of magnetic hysteresis loop process.
2. ATM (Automatic Teller Machine) according to claim 1, is characterized in that: described magnet is set to permanent magnet, DC coil, AC coil or electromagnet.
3. ATM (Automatic Teller Machine) according to claim 2, it is characterized in that: described magnet-sensitive element is comprised of two or four magnetic susceptibility unit, specification identical but response asymmetry in described magnetic susceptibility unit is in magnetic direction, when described magnetic susceptibility unit is two, two described magnetic susceptibility cell formation Hui Sitong half-bridge circuits; When described magnetic susceptibility unit is set to four, four described magnetic susceptibility cell formation Hui Sitong full-bridge circuits;
Described Hui Sitong half-bridge circuit or described Hui Sitong full-bridge circuit are symmetrically distributed in described magnet centerline both sides along magnetic induction direction, and transverse width W and described center distance that the center distance d0 that forms the described magnetic susceptibility unit of described Hui Sitong half-bridge circuit or described Hui Sitong full-bridge is less than or equal to described magnet are no more than 2/3rds of minimum magnetic code spacing.
4. ATM (Automatic Teller Machine) according to claim 3, it is characterized in that: the magnetic responsiveness of described magnetic susceptibility unit is asymmetric or antisymmetry to magnetic direction, and the magnetic susceptibility unit that is arranged in magnet centerline one side from opposite side magnetic susceptibility unit, same magnetic direction is had to contrary or different responses;
The magnetic direction that described in each, magnetic susceptibility unit detects is identical or contrary along the direction of magnet transverse shifting with magnetic code.
5. ATM (Automatic Teller Machine) according to claim 4, is characterized in that: described magnetic susceptibility unit is set to inductive coil, giant magnetoresistance, tunnel magnetoresistive, with different magnetoresistive film or device, fluxgate or the superconduction heterojunction of barber shop's formula conductive stripe.
6. the ATM (Automatic Teller Machine) described in employing claim 1 to 5 any one quantizes authenticity method, it is characterized in that: magnetic code is completed magnetic hysteresis loop process complete or part when through described Magnetic Sensor surface by described magnet magnetization, and read the signal of corresponding magnetic history and then the magnetic hysteresis loop feature of magnetic code is identified by Magnetic Sensor, the information conveyance that Magnetic Sensor obtains, to processing unit, is delivered to display unit after treated cell processing and shows;
The described magnetic hysteresis loop feature to magnetic code is identified and is comprised that magnetic code soft or hard magnetic characteristic is identified and coercive force, square degree and the reversing magnetic field of quantification definition magnetic code distribute;
Described magnetic code soft or hard magnetic characteristic identifies according to the signal of single magnetic code, whether to be specifically that single monolateral peak judges whether magnetic code is the Hard Magnetic that coercive force is greater than magnetic field of magnets;
The peak-to-peak wave amplitude ratio of different ripples that the coercive force of described quantification definition magnetic code specifically calculates each single magnetic code signal that described magnetic susceptibility unit senses is weighed and is quantized to define the coercitive size of magnetic code;
Described quantification definition magnetic code magnetic hysteresis loop square degree and reversing magnetic field distribution characteristics, specifically calculate the ratio between each section of time width of single magnetic code signal waveform sensing, and with this ratio, weigh and quantize to define square degree and the reversing magnetic field distribution of this magnetic code magnetic hysteresis loop.
7. quantification authenticity method according to claim 6, is characterized in that:
The detailed process that magnetic code soft or hard magnetic characteristic is identified is:
When a monolateral signal peak only appears in the shown signal of single magnetic code, identify that magnetic code is the Hard Magnetic that coercive force is greater than magnetic field of magnets; Otherwise be accredited as soft magnetism;
The coercitive detailed process that quantizes definition magnetic code is:
When there is two crests, the peak value at a rear peak has reflected that divided by the resulting ratio of peak value at previous peak magnetic code forward rectifys stupid size; Ratio be 1 o'clock corresponding to magnetic code coercive force, be zero, ratio is 0 o'clock, now only has a peak, corresponding to magnetic code coercive force is greater than magnet maximum transversal magnetic field, cannot be reversed by magnetic field of magnets; The corresponding wave amplitude ratio of marginal coercive force is between 1 and 0, and the less wave amplitude of coercive force ratio is more close to 1, coercive force more wave amplitude ratio more close to 0;
When there is three crests, the peak value at first peak has reflected the coercitive size of magnetic code negative sense divided by the resulting ratio of peak value at second peak simultaneously, and the less ratio of coercive force is more close to 0, coercive force more ratio more close to 1; The peak value at the 3rd peak has reflected that divided by the resulting ratio of peak value at second peak magnetic code forward rectifys stupid size, and the less wave amplitude of coercive force ratio is more close to 1, coercive force more wave amplitude ratio more close to 0;
Quantize definition magnetic code magnetic hysteresis loop square degree and reversing magnetic field distribution characteristics specifically:
When waveform is interval, width beguine calculates according to the shown signal of each single magnetic code;
When only having a signal peak, magnetic code is the Hard Magnetic that magnet cannot reverse, and can not identify that reversing magnetic field distributes; Its square degree is for carrying out quantitative expression by peak value to falling after rise to mistiming of 90% and the ratio of this peak width;
When there are two or three signal peaks, penultimate peak by peak value, to falling mistiming of 90% and the ratio of this peak half-peak breadth after rise, be square metric; With the ratio that this peak is 50% half-peak breadth to the mistiming of making zero and this peak by peak value, be that reversing magnetic field distributes.
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| CN103366438B (en) * | 2013-07-06 | 2015-09-02 | 广州纳龙智能科技有限公司 | A kind of method of Magnetic Sensor, quantification qualification magnetic code magnetic hysteresis loop feature and ATM (Automatic Teller Machine), cash inspecting machine |
| CN104346856A (en) * | 2013-08-02 | 2015-02-11 | 北京嘉岳同乐极电子有限公司 | Magnetic imaging sensor |
| CN106156672B (en) * | 2015-04-22 | 2018-09-18 | 上海天臣防伪技术股份有限公司 | The method that anti-counterfeit recognition is carried out to the anti-counterfeiting mark containing magnetic material |
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