CN203773622U - Device for quantitatively identifying authenticity of currencies - Google Patents
Device for quantitatively identifying authenticity of currencies Download PDFInfo
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- CN203773622U CN203773622U CN201420188886.2U CN201420188886U CN203773622U CN 203773622 U CN203773622 U CN 203773622U CN 201420188886 U CN201420188886 U CN 201420188886U CN 203773622 U CN203773622 U CN 203773622U
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Abstract
A device for quantitatively identifying the authenticity of currencies is provided with a memory used for pre-storing correct password information of currencies, a magnetic sensor used for detecting test password information of a to-be-identified currency and transmitting the detected test password information to a processor, a processor used for receiving the information transmitted by the magnetic sensor, comparing the test password information transmitted by the magnetic sensor with a real password in the memory and judging the authenticity of the to-be-identified currency, and a controller used for controlling the working condition of the memory, the magnetic sensor and the processor. Under the control of the controller, the magnetic sensor detects the to-be-identified currency to acquire the test password information and transmits the test password information to the processor, and the processor compares the test password information with the correct password information pre-stored in the memory and judges the authenticity of the to-be-identified currency. The device of the utility model can be used for quantitatively identifying the authenticity of currencies, and has the characteristics of high precision.
Description
Technical field
The utility model relates to currency authentication detection technology field, particularly relates to a kind of device of the Quantitative measurement currency true and false.
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 magnetic code feature is detected 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, more fubaritic full hysteresis loop line feature because of it to magnetic direction response is symmetrical.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, the authentication detection technology that can differentiate the more technical characterictics of currency need to be provided.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, and more soft or hard magnetic attribute and the magnetic hysteresis loop feature of magnetic code can be quantitatively identified in requirement, to guarantee the stability of signal judgement and the uncertainty of reduction authentication method.
Currency authenticity device of the prior art adopts qualitative judgement more, and does not adopt Quantitative measurement, causes appraisal of coinage not accurate enough.Therefore, not enough for prior art, provided a kind of device of the Quantitative measurement currency true and false very necessary to overcome prior art deficiency.
Summary of the invention
The purpose of this utility model is to avoid weak point of the prior art and device that a kind of Quantitative measurement currency true and false is provided, and the device of this Quantitative measurement currency true and false can be differentiated in quantitative mode the true and false of currency, has feature accurately.
Above-mentioned purpose of the present utility model realizes by following technical measures.
A device for the Quantitative measurement currency true and false, is provided with
One memory body, for the proper password information of pre-stored currency;
One Magnetic Sensor, for detection of the test encrypted message of currency to be identified, and is delivered to processor by detected test encrypted message;
One processor, the information transmitting for receiving described Magnetic Sensor, the test encrypted message that described Magnetic Sensor is transmitted and the true password in described memory body compare, and judge the true and false of currency to be identified;
One controller, for controlling the operating mode of described memory body, described Magnetic Sensor and described processor;
Under the control of controller, Magnetic Sensor detects and obtains test encrypted message currency to be identified, and test encrypted message is delivered to processor, processor compares by test encrypted message and the proper password information being pre-stored within memory body the true and false that judges currency to be tested.
In above-mentioned memory body, the true password of currency comprises that magnetic hysteresis loop feature under magnetic field of magnetic code distributed intelligence in currency, each magnetic code and coercive force, square degree and reversing magnetic field by the resulting quantitative magnetic code soft or hard magnetic characteristic assignment of corresponding magnetic hysteresis loop feature and magnetic code distribute;
Described Magnetic Sensor surveys magnetic hysteresis loop feature under magnetic field of the magnetic code distributed intelligence that obtains in currency to be identified, each magnetic code and coercive force, square degree and reversing magnetic field by the corresponding resulting magnetic code soft or hard of magnetic hysteresis loop feature magnetic characteristic assignment and magnetic code distribute.
Further, in above-mentioned memory body, the true password of currency also comprises at least one in length, width, thickness and the weight of currency;
Described Magnetic Sensor also detects at least one in length, width, thickness and the weight of currency to be tested;
The detected parameters of described Magnetic Sensor is consistent with the parameter of true password in described memory body.
Above-mentioned processor and described controller become one.
Preferably, above-mentioned Magnetic Sensor is provided with magnet and magnet-sensitive element, the magnetic code magnetic field that described magnet-sensitive element produces the magnetic code in described magnet magnetization currency to be identified responds, magnetic code in currency to be identified 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;
Described magnet is set to strip, the transverse width W of described magnet is no more than 2/3rds of minimum magnetic code 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;
Described magnet-sensitive element is comprised of two or four magnetic susceptibility unit, and described magnetic susceptibility unit specification is identical, when described magnetic susceptibility unit is two, and 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 circuit is less than or equal to described magnet are no more than 2/3rds of minimum magnetic code gap;
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;
Magnetic Sensor identifies that to the magnetic hysteresis loop feature of magnetic code the coercive force, square degree and the reversing magnetic field that comprise magnetic code soft or hard magnetic characteristic assignment and quantize definition magnetic code distribute;
Whether described magnetic code soft or hard magnetic characteristic assignment is specifically that single monolateral peak judges whether magnetic code is that coercive force is greater than the Hard Magnetic of magnetic field of magnets and carries out assignment according to the soft or hard magnetic characteristic of magnetic code according to the signal of single magnetic code; When only there is a monolateral signal peak 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, assignment is one; Otherwise be accredited as soft magnetism, assignment is zero;
Quantize the coercive force of definition magnetic code specifically: the peak-to-peak wave amplitude ratio of different ripples that calculates each single magnetic code signal that described magnetic susceptibility unit senses is weighed and quantized to define the coercitive size of magnetic code; The coercitive detailed process that quantizes definition magnetic code is:
When there is two crests, the peak value at a rear peak has reflected the coercitive size of magnetic code forward divided by the resulting ratio of peak value at previous peak; 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 the coercitive size of magnetic code forward divided by the resulting ratio of peak value at second peak, and the less wave amplitude of coercive force ratio is more close to 1, coercive force more wave amplitude ratio more close to 0;
The magnetic code magnetic hysteresis loop square degree and the reversing magnetic field distribution that quantize definition magnetic code are by calculating 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; Quantizing definition magnetic code magnetic hysteresis loop square degree and reversing magnetic field distributes 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 half-peak breadth;
When there are two or three signal peaks, penultimate peak by peak value to the ratio that falls the half-peak breadth at mistiming of 90% and penultimate peak after rise, be square metric; With the ratio that penultimate peak is the half-peak breadth at 50% to the mistiming of making zero and penultimate peak by peak value, it is reversing magnetic field distribution value.
Another is preferred, above-mentioned Magnetic Sensor is provided with magnet and magnet-sensitive element, the magnetic code magnetic field size that described magnet-sensitive element produces magnetic code in described magnet magnetization currency and the direction in magnetic code magnetic field respond, 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;
Described magnet-sensitive element is comprised of two or four magnetic susceptibility unit, and described magnetic susceptibility unit specification is identical and identical to magnetic direction response, 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;
The magnetic responsiveness of described magnetic susceptibility unit is identical with magnetic direction, and the magnetic susceptibility unit that is arranged in magnet centerline one side with in opposite side magnetic susceptibility unit, same magnetic direction is had to identical response;
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;
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 conductive stripe;
Magnetic Sensor identifies that to the magnetic hysteresis loop feature of magnetic code the coercive force, square degree and the reversing magnetic field that comprise magnetic code soft or hard magnetic characteristic assignment and quantize definition magnetic code distribute;
Whether described magnetic code soft or hard magnetic characteristic assignment is specifically that monolateral peak judges whether magnetic code is the soft magnetism that coercive force is less than magnetic field of magnets according to the signal of single magnetic code; When only there is monolateral signal peak in the shown signal of single magnetic code, identify that magnetic code is the soft magnetism that coercive force is less than magnetic field of magnets, assignment is zero; Otherwise be accredited as Hard Magnetic, assignment is one;
The coercive force of described quantification definition magnetic code specifically calculates the wide ratio of the peak-to-peak ripple of different ripples of each single magnetic code signal that described magnetic susceptibility unit senses or half peak time ratio or difference and weighs and quantize to define the coercitive size of magnetic code;
The coercitive detailed process that quantizes definition magnetic code is:
When there is two monolateral crests, judge that coercive force is as zero;
When there is two bilateral crests, judge that coercive force is greater than magnetic field of magnets;
When occurring more than two bilateral crests, coercive force is less than magnetic field of magnets, and during the half-peak of the peak width ratio of first crest and second crest or first crest and second crest during the half-peak of wide ratio or first crest and second crest wide difference quantize the coercitive size of definition;
When occurring more than two bilateral crests, ratio more approach 1.0 or the more approaching zero explanation coercive force of difference more approach magnetic field of magnets, ratio more depart from 1.0 or difference more offset from zero coercive force be more less than magnetic field of magnets.
The device of a kind of Quantitative measurement currency true and false of the present utility model, is provided with a memory body, for the proper password information of pre-stored currency; One Magnetic Sensor, for detection of the test encrypted message of currency to be identified, and is delivered to processor by detected test encrypted message; One processor, the information transmitting for receiving described Magnetic Sensor, the test encrypted message that described Magnetic Sensor is transmitted and the true password in described memory body compare, and judge the true and false of currency to be identified; One controller, for controlling the operating mode of described memory body, described Magnetic Sensor and described processor; Under the control of controller, Magnetic Sensor detects and obtains test encrypted message currency to be identified, and test encrypted message is delivered to processor, processor compares by test encrypted message and the proper password information being pre-stored within memory body the true and false that judges currency to be tested.The method of the device of the Quantitative measurement currency true and false of the present utility model and the Quantitative measurement currency true and false, can differentiate in quantitative mode and the true and false of currency have feature accurately.
Accompanying drawing explanation
The utility model is described in further detail to utilize accompanying drawing, but content in accompanying drawing does not form any restriction of the present utility model.
Fig. 1 is the structural representation of the device of a kind of Quantitative measurement currency of the utility model true and false.
Fig. 2 is the structural representation of Magnetic Sensor of the device of a kind of Quantitative measurement currency of the utility model true and false.
At Fig. 1 and Fig. 2, comprise:
Memory body 100, Magnetic Sensor 200, processor 300, controller 400,
Module 1, shell 2, wheatstone bridge circuits interface 3, magnet-sensitive element 4 and magnet 5.
Embodiment
With the following Examples the utility model is further described.
embodiment 1.
A device for the Quantitative measurement currency true and false, as shown in Figure 1, is provided with
One memory body 100, for the proper password information of pre-stored currency;
One Magnetic Sensor 200, for detection of the test encrypted message of currency to be identified, and is delivered to processor 300 by detected test encrypted message;
One processor 300, the information transmitting for receiving Magnetic Sensor 200, the test encrypted message that Magnetic Sensor 200 is transmitted and the true password in memory body 100 compare, and judge the true and false of currency to be identified;
One controller 400, for controlling the operating mode of memory body 100, Magnetic Sensor 200 and processor 300.
Under the control of controller 400,200 pairs of currency to be identified of Magnetic Sensor detect and obtain test encrypted message, and test encrypted message is delivered to processor 300, processor 300 compares by test encrypted message and the proper password information being pre-stored within memory body 100 true and false that judges currency to be tested.
In memory body 100, by program, in advance the proper password information of currency is stored in wherein, in memory body 100, the true encrypted message of currency comprises magnetic hysteresis loop feature under magnetic field of magnetic code distributed intelligence in currency, each magnetic code and by coercive force, square degree and the reversing magnetic field distribution characteristics of the resulting quantitative magnetic code soft or hard magnetic characteristic assignment of corresponding magnetic hysteresis loop feature and magnetic code, the true encrypted message of the currency of the storage in memory body 100 also has length, width, thickness and the weight of currency.
Magnetic Sensor 200 is corresponding surveys magnetic hysteresis loop feature under magnetic field of the magnetic code distributed intelligence that obtains in currency to be identified, each magnetic code and coercive force, square degree and reversing magnetic field by the corresponding resulting magnetic code soft or hard of magnetic hysteresis loop feature magnetic characteristic assignment and magnetic code distribute, and the length of currency, width, thickness and weight information.
The detected parameters of Magnetic Sensor 200 is consistent with the parameter of true password in memory body 100, so that the parameter of 300 pairs of needs of processor contrasts judgement one by one, is conducive to guarantee the accuracy of authentication information.
Controller 400 is for carrying out system control to the whole operating mode of the device of this Quantitative measurement currency true and false.
Processor 300 can become one to dwindle the submission of single unit system with controller 400, also can adopt released state.
The device of this Quantitative measurement currency true and false is by being stored in the true quantitative information of currency in advance in memory body 100 parameter as a comparison, by Magnetic Sensor 200, detect the relevant quantitative parameter of currency to be identified, the actual parameter of storage in the quantitative parameter of currency to be identified and memory body 100 is contrasted, can accurately judge the true and false of currency to be identified by quantitative manner, there is the feature accurately of identifying.
embodiment 2.
A kind of device of the Quantitative measurement currency true and false, other structures are identical with embodiment 1, the Magnetic Sensor 200 also with following concrete structure: as shown in Figure 2, Magnetic Sensor 200 is provided with matrix 1, shell 2, wheatstone bridge circuits interface 3, magnet-sensitive element 4 and magnet 5.
Matrix 1 is for carrying other parts, and the object that matrix 1 is generally plastic cement piece or forms physical strength by other forms.The magnetic code magnetic field of the different directions producing during 4 pairs of magnet of magnet-sensitive element, 5 magnetization magnetic code responds, when magnetic code is magnetized by magnet 5 and completes magnetic hysteresis loop process complete or part when through Magnetic Sensor 200 surface, and by Magnetic Sensor 200, read the signal acquisition test encrypted message of corresponding magnetic history.
Magnet 5 is set to strip, and magnet 5 can be single or multiple permanent magnets, direct current or AC coil or other electromagnet.
The transverse width W of magnet 5 is no more than 2/3rds of minimum magnetic code spacing.Minimum magnetic code spacing is general knowledge known in this field, and the distance between two adjacent magnetic codes is magnetic code spacing, and the spacing in all magnetic code spacing between adjacent two magnetic codes of numerical value minimum is minimum magnetic code spacing.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.
Applicant finds by research, and the transverse width of magnet 5 can impact signal stack, and 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 200, and transverse field strength can allow magnetic code when along horizontal process Magnetic Sensor 200, 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 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.
Magnet 5 can be single or multiple permanent magnets, direct current or AC coil or other electromagnet.Magnetic code is magnetized by magnet 5 and completes part or complete and a magnetic hysteresis loop process when through Magnetic Sensor 200 surface, and by Magnetic Sensor 200, is read the signal of this magnetic history.
By this Magnetic Sensor 200, when magnetic code is completed magnetic hysteresis loop process complete or part when through Magnetic Sensor 200 surface by magnet magnetization, and test accordingly encrypted message by the signal acquisition that Magnetic Sensor 200 reads corresponding magnetic history.
By this Magnetic Sensor 200, can carry out magnetic hysteresis loop feature to each magnetic code of currency and read, make currency false distinguishing more comprehensive and more accurate.
Magnetic code magnetic hysteresis loop feature is identified in the quantification of being undertaken by this Magnetic Sensor 200, magnetic code is completed magnetic hysteresis loop process complete or part when through Magnetic Sensor 200 surface by described magnet magnetization, and is read the signal of corresponding magnetic history and obtained the test encrypted message of currency to be identified by Magnetic Sensor 200.
Test encrypted message comprises magnetic code soft or hard magnetic characteristic assignment, quantizes the coercive force of definition magnetic code, quantizes the square degree of definition magnetic code and quantizes definition reversing magnetic field distributing.
Wherein, whether magnetic code soft or hard magnetic characteristic assignment is to be 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.Hard Magnetic assignment is one, and soft magnetism assignment is zero.By numerical value so as with memory body 100 in pre-stored proper password contrast, there is the feature easily that contrasts.
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.
Quantize 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 quantize to identify represent the square degree (Sq=Mr/Ms) of magnetic hysteresis loop feature and reversing magnetic field distribution (
).
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.
Concrete, 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.
This Magnetic Sensor 200, 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.
By this Magnetic Sensor 200, 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.
Therefore the device of the Quantitative measurement currency true and false of the present utility model, can implement to quantize criterion to whole magnetic codes in currency, can effectively check and prevent counterfeit money, identifies precisely.
In addition, this Magnetic Sensor 200 is simple in structure, easy to use, is not only suitable for currency authenticity, and the authenticity of other article such as applicable check.
The signal of surveying by this Magnetic Sensor 200, 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 quantize to identify represent the square degree (Sq=Mr/Ms) of magnetic hysteresis loop feature and reversing magnetic field distribution (
), 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.Owing to can distinguishing magnetic code, 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.Can implement to quantize criterion to whole magnetic codes in currency, can effectively check and prevent counterfeit money, identify precisely to there is method easy and simple to handle, the accurate feature of result.
embodiment 3.
A device for the Quantitative measurement currency true and false, other structure is identical with embodiment 2, and difference is, and 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 this Magnetic Sensor 200, can read the magnetic hysteresis loop feature of each magnetic code of currency, make currency false distinguishing more accurate.
embodiment 4.
A kind of device of the Quantitative measurement currency true and false, other structures are identical with embodiment 2 or 3, difference is, adopts the Magnetic Sensor 200 of following concrete structure: as shown in Figure 2, be provided with matrix 1, shell 2, wheatstone bridge circuits interface 3, magnet-sensitive element 4 and magnet 5.
Matrix 1 is for carrying other parts, and the object that matrix 1 is generally plastic cement piece or forms physical strength by other forms.The magnetic code magnetic field size and the magnetic code magnetic direction that during 4 pairs of magnet of magnet-sensitive element, 5 magnetization magnetic code, produce respond, when magnetic code is magnetized by magnet 5 and completes magnetic hysteresis loop process complete or part when through Magnetic Sensor 200 surface, and read the signal of corresponding magnetic history and then identify by Magnetic Sensor 200.
Magnet 5 is set to strip, and magnet 5 can be single or multiple permanent magnets, direct current or AC coil or other electromagnet.
The south poles of magnet 5 is perpendicular to magnetic induction direction and the magnetic inductor plane of Magnetic Sensor 200, and transverse field strength can allow magnetic code when along horizontal process Magnetic Sensor 200, experience part or all of magnetic hysteresis loop process.
Concrete, the magnetic responsiveness of magnetic susceptibility unit is identical to same magnetic direction, and the magnetic susceptibility unit that is arranged in magnet 5 center line one sides with in opposite side magnetic susceptibility unit, same magnetic direction is had to identical response.
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.
Magnet 5 can be single or multiple permanent magnets, direct current or AC coil or other electromagnet.Magnetic code is magnetized by magnet 5 and completes part or complete and a magnetic hysteresis loop process when through Magnetic Sensor 200 surface, and by Magnetic Sensor 200, is read the signal of this magnetic history.
This Magnetic Sensor 200, when magnetic code is completed magnetic hysteresis loop process complete or part when through Magnetic Sensor 200 surface by magnet magnetization, and is read the signal of corresponding magnetic history and then is identified by Magnetic Sensor 200.By this Magnetic Sensor 200, can carry out magnetic hysteresis loop feature to each magnetic code of currency and read, make currency false distinguishing more comprehensive and more accurate.
By this Magnetic Sensor 200, can distinguish magnetic code and belong to soft magnetism or Hard Magnetic; Can quantize to define magnetic hysteresis loop feature, comprise coercive force; Its determination methods is for the magnetic hysteresis loop feature of each independent magnetic code itself, thereby do not rely on the power of 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 utility model is identified 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 Magnetic Sensor 200 is simple in structure, easy to use, is not only suitable for currency authenticity, and the authenticity of other article such as applicable check.
Adopt this Magnetic Sensor 200 to quantize to identify magnetic code magnetic hysteresis loop feature, magnetic code is completed magnetic hysteresis loop process complete or part when through Magnetic Sensor 200 surface by described magnet magnetization, and is identified by the signal that Magnetic Sensor 200 reads corresponding magnetic history.
Magnetic code soft or hard magnetic characteristic identifies whether be is that monolateral peak judges whether magnetic code belongs to Hard Magnetic or soft magnetism according to the signal of single magnetic code.When only occurring that two monolateral signal peaks represent that magnetic code is can be by the soft magnetism of magnet reverse magnetization direction; If there are two bilateral signal peaks (positive and negative signal peak occurs), be judged as the Hard Magnetic that coercive force is greater than magnetic field of magnets simultaneously.
The coercive force that quantizes definition magnetic code specifically calculates the wide ratio of the peak-to-peak crest of different ripples or wide ratio value or the wide difference of half peak time of half peak time of each single magnetic code signal that magnetic susceptibility unit senses, with this ratio or difference, weighs and quantizes to define the coercitive size of this magnetic code.
When there is two monolateral crests, coercive force is zero.
When there is two bilateral crests, coercive force is greater than magnetic field of magnets.
When occurring more than two bilateral crests, coercive force is less than magnetic field of magnets.And during the half-peak of the peak width ratio of first crest and second crest or first crest and second crest, wide difference quantizes the coercitive size of definition during the half-peak of wide ratio or first crest and second crest.
When occurring more than two bilateral crests, above-mentioned ratio more approach 1.0 or the more approaching zero explanation coercive force of difference more approach magnetic field of magnets.Ratio more depart from 1.0 or difference more offset from zero coercive force be more less than magnetic field of magnets.
Magnetic Sensor 200 of the present utility model, 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 to quantize to identify that magnetic code coercive force does 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.
Owing to can distinguishing magnetic code, belong to soft magnetism or Hard Magnetic; Can quantize to define magnetic hysteresis loop feature, comprise coercive force; 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.Can implement to quantize criterion to whole magnetic codes in currency, can effectively check and prevent counterfeit money, identify precisely to there is method easy and simple to handle, the accurate feature of result.
It should be noted that, the device and method of the Quantitative measurement currency true and false of the present utility model, is 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 the restriction for the technical solution of the utility model is described but not to the utility model protection domain only; although the utility model 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 the technical solution of the utility model, and not depart from essence and the scope of technical solutions of the utility model.
Claims (6)
1. a device for the Quantitative measurement currency true and false, is characterized in that: be provided with
One memory body, for the proper password information of pre-stored currency;
One Magnetic Sensor, for detection of the test encrypted message of currency to be identified, and is delivered to processor by detected test encrypted message;
One processor, the information transmitting for receiving described Magnetic Sensor, the test encrypted message that described Magnetic Sensor is transmitted and the true password in described memory body compare, and judge the true and false of currency to be identified;
One controller, for controlling the operating mode of described memory body, described Magnetic Sensor and described processor;
Under the control of controller, Magnetic Sensor detects and obtains test encrypted message currency to be identified, and test encrypted message is delivered to processor, processor compares by test encrypted message and the proper password information being pre-stored within memory body the true and false that judges currency to be tested.
2. the device of the Quantitative measurement currency true and false according to claim 1, is characterized in that:
In described memory body, the true password of currency comprises that magnetic hysteresis loop feature under magnetic field of magnetic code distributed intelligence in currency, each magnetic code and coercive force, square degree and reversing magnetic field by the resulting quantitative magnetic code soft or hard magnetic characteristic assignment of corresponding magnetic hysteresis loop feature and magnetic code distribute;
Described Magnetic Sensor surveys magnetic hysteresis loop feature under magnetic field of the magnetic code distributed intelligence that obtains in currency to be identified, each magnetic code and coercive force, square degree and reversing magnetic field by the corresponding resulting magnetic code soft or hard of magnetic hysteresis loop feature magnetic characteristic assignment and magnetic code distribute.
3. the device of the Quantitative measurement currency true and false according to claim 2, is characterized in that:
In described memory body, the true password of currency also comprises at least one in length, width, thickness and the weight of currency;
Described Magnetic Sensor also detects at least one in length, width, thickness and the weight of currency to be tested;
The detected parameters of described Magnetic Sensor is consistent with the parameter of true password in described memory body.
4. the device of the Quantitative measurement currency true and false according to claim 3, is characterized in that: described processor and described controller become one.
5. according to the device of the Quantitative measurement currency true and false described in claim 1 to 4 any one, it is characterized in that:
Described Magnetic Sensor is provided with magnet and magnet-sensitive element, the magnetic code magnetic field that described magnet-sensitive element produces the magnetic code in described magnet magnetization currency to be identified responds, magnetic code in currency to be identified 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;
Described magnet is set to strip, the transverse width W of described magnet is no more than 2/3rds of minimum magnetic code 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;
Described magnet-sensitive element is comprised of two or four magnetic susceptibility unit, and described magnetic susceptibility unit specification is identical, when described magnetic susceptibility unit is two, and 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 circuit is less than or equal to described magnet are no more than 2/3rds of minimum magnetic code gap;
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;
Magnetic Sensor identifies that to the magnetic hysteresis loop feature of magnetic code the coercive force, square degree and the reversing magnetic field that comprise magnetic code soft or hard magnetic characteristic assignment and quantize definition magnetic code distribute;
Whether described magnetic code soft or hard magnetic characteristic assignment is specifically that single monolateral peak judges whether magnetic code is that coercive force is greater than the Hard Magnetic of magnetic field of magnets and carries out assignment according to the soft or hard magnetic characteristic of magnetic code according to the signal of single magnetic code; When only there is a monolateral signal peak 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, assignment is one; Otherwise be accredited as soft magnetism, assignment is zero;
Quantize the coercive force of definition magnetic code specifically: the peak-to-peak wave amplitude ratio of different ripples that calculates each single magnetic code signal that described magnetic susceptibility unit senses is weighed and quantized to define the coercitive size of magnetic code; The coercitive detailed process that quantizes definition magnetic code is:
When there is two crests, the peak value at a rear peak has reflected the coercitive size of magnetic code forward divided by the resulting ratio of peak value at previous peak; 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 the coercitive size of magnetic code forward divided by the resulting ratio of peak value at second peak, and the less wave amplitude of coercive force ratio is more close to 1, coercive force more wave amplitude ratio more close to 0;
The magnetic code magnetic hysteresis loop square degree and the reversing magnetic field distribution that quantize definition magnetic code are by calculating 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; Quantizing definition magnetic code magnetic hysteresis loop square degree and reversing magnetic field distributes 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 half-peak breadth;
When there are two or three signal peaks, penultimate peak by peak value to the ratio that falls the half-peak breadth at mistiming of 90% and penultimate peak after rise, be square metric; With the ratio that penultimate peak is the half-peak breadth at 50% to the mistiming of making zero and penultimate peak by peak value, it is reversing magnetic field distribution value.
6. according to the device of the Quantitative measurement currency true and false described in claim 1 to 4 any one, it is characterized in that:
Described Magnetic Sensor is provided with magnet and magnet-sensitive element, the magnetic code magnetic field size that described magnet-sensitive element produces magnetic code in described magnet magnetization currency and the direction in magnetic code magnetic field respond, 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;
Described magnet-sensitive element is comprised of two or four magnetic susceptibility unit, and described magnetic susceptibility unit specification is identical and identical to magnetic direction response, 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;
The magnetic responsiveness of described magnetic susceptibility unit is identical with magnetic direction, and the magnetic susceptibility unit that is arranged in magnet centerline one side with in opposite side magnetic susceptibility unit, same magnetic direction is had to identical response;
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;
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 conductive stripe;
Magnetic Sensor identifies that to the magnetic hysteresis loop feature of magnetic code the coercive force, square degree and the reversing magnetic field that comprise magnetic code soft or hard magnetic characteristic assignment and quantize definition magnetic code distribute;
Whether described magnetic code soft or hard magnetic characteristic assignment is specifically that monolateral peak judges whether magnetic code is the soft magnetism that coercive force is less than magnetic field of magnets according to the signal of single magnetic code; When only there is monolateral signal peak in the shown signal of single magnetic code, identify that magnetic code is the soft magnetism that coercive force is less than magnetic field of magnets, assignment is zero; Otherwise be accredited as Hard Magnetic, assignment is one;
The coercive force of described quantification definition magnetic code specifically calculates the wide ratio of the peak-to-peak ripple of different ripples of each single magnetic code signal that described magnetic susceptibility unit senses or half peak time ratio or difference and weighs and quantize to define the coercitive size of magnetic code;
The coercitive detailed process that quantizes definition magnetic code is:
When there is two monolateral crests, judge that coercive force is as zero;
When there is two bilateral crests, judge that coercive force is greater than magnetic field of magnets;
When occurring more than two bilateral crests, coercive force is less than magnetic field of magnets, and during the half-peak of the peak width ratio of first crest and second crest or first crest and second crest during the half-peak of wide ratio or first crest and second crest wide difference quantize the coercitive size of definition;
When occurring more than two bilateral crests, ratio more approach 1.0 or the more approaching zero explanation coercive force of difference more approach magnetic field of magnets, ratio more depart from 1.0 or difference more offset from zero coercive force be more less than magnetic field of magnets.
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| CN201420188886.2U CN203773622U (en) | 2014-04-17 | 2014-04-17 | Device for quantitatively identifying authenticity of currencies |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103886671A (en) * | 2014-04-17 | 2014-06-25 | 广州纳龙智能科技有限公司 | Device and method for quantitative identification of authenticity of currencies |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103886671A (en) * | 2014-04-17 | 2014-06-25 | 广州纳龙智能科技有限公司 | Device and method for quantitative identification of authenticity of currencies |
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Effective date of registration: 20190815 Address after: Room 8 1801, Shabeiheng Street, Chang'an Town, Dongguan City, Guangdong Province Patentee after: Dongguan Huanji Industrial Investment Co., Ltd. Address before: Room G-418, Science and Technology Innovation Base, 80 Lanyue Road, Guangzhou Science City, Guangdong Province Patentee before: Guangzhou Nalong Intelligent Science & Technology Co., Ltd. |
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Granted publication date: 20140813 Termination date: 20200417 |