CN102592347A - Method and device for carrying out identification of bank notes based on spectrum analysis technique - Google Patents
Method and device for carrying out identification of bank notes based on spectrum analysis technique Download PDFInfo
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- CN102592347A CN102592347A CN2012100435165A CN201210043516A CN102592347A CN 102592347 A CN102592347 A CN 102592347A CN 2012100435165 A CN2012100435165 A CN 2012100435165A CN 201210043516 A CN201210043516 A CN 201210043516A CN 102592347 A CN102592347 A CN 102592347A
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Abstract
The invention discloses a method and a device for carrying out identification of bank notes based on a spectrum analysis technique. The device comprises a light source, a bank-note passing channel, a monochromator, a photosensitive sensor, a signal amplifier and a digital processing unit, wherein a chromatic dispersion element in the monochromator is a diffraction grating, a prism, or an optical filter with a spectral resolution. The method comprises the following steps of: carrying out chromatic dispersion on reflected and transmitted light rays of a bank note by the monochromator; receiving the light intensity of each waveband by a receiving sensor so as to obtain reflected and transmitted spectral data of each waveband; carrying out relative analysis according to the data of a to-be-discriminated bank note and the data of a standard bank note, thereby obtaining relative coefficients; and discriminating whether the bank note is true and false according to the relative coefficients.
Description
Technical field
The present invention relates to the method and apparatus that a kind of authenticity of banknotes is differentiated, be applicable to the needs that authenticity of banknotes is differentiated.
Background technology
Mainly contain following several kinds of optics identification methods at present in authenticity of banknotes discriminating field:
1, it is luminous to utilize three-color light-emitting diode LED to switch in turn, adopts line array sensor sample respectively the three primary colours reflection and the transmission data of banknote.Perhaps adopt white light source, adopt three groups of sensor groups that have a three primary colours optical filter to reflect simultaneously and sample with transmission.The three primary colours data are being proofreaied and correct laggard circumstances in which people get things ready for a trip degree Coordinate Calculation, the data of banknote to be identified and template are being compared discern the false from the genuine.
2, the infrared printing ink of inspection banknote surface: infrared radiation in banknote surface, is discerned the false from the genuine according to reflection and transmission absorption characteristic.
3, adopt the ultraviolet source irradiation banknote surface, excite the banknote surface fluorescent material to make it produce fluorescence and phosphorescent radiation,, confirm the true and false of banknote to be identified through detected fluorescence and phosphorescence spectrum characteristic by other parasitic light of optical filter filtering.
4, adopt the THz wave spectral analysis technology, differentiate authenticity of banknotes according to the dactylogram data of THz wave spectral coverage.
Above method can be differentiated the true and false of banknote to a great extent, but still exist some anti-counterfeiting characteristic is prone to copy, and feature locations is less; Can not be effectively to the adulterium coin with piece together coin and carry out false distinguishing; Though adopt the THz wave spectral analysis technology comparatively accurate, realize technical sophistication at present, cost is high; Discriminating speed is slow, can't be applied in the cash handling devices such as paper money counter, cleaning-sorting machine.Therefore we still need the banknote spectrum authentication technique of a kind of low cost, high-speed, compact conformation.
Summary of the invention
First technical matters to be solved by this invention provides a kind of banknote false distinguishing method based on spectral analysis technique of needs of conterfeit note and adulterium being pieced together the discriminating of banknote that solves fast, reliably, effectively.
Second technical matters to be solved by this invention provides a kind of device of realizing this low cost based on the banknote false distinguishing method of spectral analysis technique, high-speed, compact conformation.
In order to solve above-mentioned first technical matters, the banknote false distinguishing method based on spectral analysis technique provided by the invention, performing step is following:
(1), selected wavelength coverage is that the hybrid light source of combination of any wavelength of infrared light or above-mentioned two wavelength band of ultraviolet light or the 700nm～30000nm of 100nm～420nm is radiated on the banknote; Banknote produces reflected light and transmitted light; With monochromator the reflected light and the transmitted light of banknote carried out chromatic dispersion, measure reflected light and the light intensity of transmitted light after the chromatic dispersion respectively with sensor;
(2), the signal to sensor sample amplifies;
(3), amplified analog signal input digit processing unit being carried out the laggard digitized of analog to digital conversion handles;
(4), with the data of banknote to be identified with carry out related operation respectively through the standard banknote of national nominally issued being sampled and being stored in the standard spectrum data wavelength basis dimension that digital processing element forms banknote; Calculate related coefficient, differentiate authenticity of banknotes according to the related coefficient size.
With the perpendicular direction of banknote moving direction on an above check point is set, thereby many group sampled datas are arranged on the banknote length direction, on the banknote moving direction, repeatedly sample; Thereby repeatedly sampled data is arranged on the banknote Width; As above the spectroscopic data of data and two above wave bands forms a three-dimensional matrice, two physical dimension planes that dimension is a banknote, and the 3rd dimension is wavelength; Digital processing element stores three-dimensional normal data in advance; The data of banknote to be identified and normal data wavelength basis dimension are carried out related operation respectively, calculate related coefficient, confirm authenticity of banknotes according to the related coefficient size.
In order to solve above-mentioned second technical matters; Realization provided by the invention is based on the device of the banknote false distinguishing method of spectral analysis technique; Comprised the paper money passage; Comprise a described light source of crossing the paper money passage of irradiation; Comprise that at least one receives the described catoptrical reflected light monochromator of crossing the banknote on the paper money passage and receives the described transmitted light monochromator of crossing the transmitted light of the banknote on the paper money passage with at least one; Comprise first light sensor that docks with described reflected light monochromator and second light sensor that docks with described transmitted light monochromator, described first light sensor and second light sensor are electrically connected with the digitized processing unit through a signal amplifier respectively.
Described light source is that wavelength coverage is the ultraviolet source of 100nm～420nm, and described ultraviolet source is gas discharge ultraviolet source or light emitting diode ultraviolet source or laser ultraviolet source.
Described light source is that wavelength coverage is the infrared light light source of 700nm～30000nm, and said infrared light light source is gas discharge infrared light supply or light emitting diode infrared light supply or laser infrared light supply or heat radiation infrared light supply.
Dispersion element is prism or diffraction grating in described reflected light monochromator and the described transmitted light monochromator.
Described reflected light monochromator and described transmitted light monochromator list group are used, or many groups are arranged on the perpendicular direction of banknote moving direction, preferably adopt 2 to 6 groups.
The dispersion element of described reflected light monochromator and transmitted light monochromator is an optical filter; Filter system adopts two or more sample windows to combine; Each sample window is placed different optical filters respectively; Each optical filter is selected respectively to see through different-waveband, places photoelectric cell or photosensitive tube sampling behind the optical filter, perhaps places the sensor of selecting to see through different-waveband in each sample window.
A plurality of described sample windows are along the arrangement that is in line of banknote direction of motion.
Described first light sensor and second light sensor are line array sensor or area array sensor or at least two above photoelectric sensor combinations, and described first light sensor and the second light sensor kind comprise: CCD linear array or area array sensor, CIS contact-type image sensor, cmos sensor, photoelectric cell, photosensitive tube.
Adopt the banknote false distinguishing method and apparatus based on spectral analysis technique of technique scheme; The paper of banknote and printing ink are mixed by multiple material; Different materials has the differing absorption characteristic in the ultraviolet-visible zone; Banknote can be because of the transition generation fluorescence and the phosphorescence reaction in various degree of electron level under the exciting of light, and banknote can demonstrate its unique absorption characteristic.At region of ultra-red; Because of each material in the banknote form in the beam frequency of vibration and rotation or chemical bond of specific molecular can produce the resonance absorption phenomenon when identical or close with incident infrared light frequency, so have its unique infrared absorption spectrum characteristic according to the material composition of banknote.According to the characteristic of banknote, the present invention selectes mixed light, and wavelength coverage is the combination of any wavelength of infrared light or above-mentioned two wavelength band of ultraviolet light or the 700nm～30000nm of 100nm～420nm.Adopt a hybrid light source to be radiated on the banknote, banknote can be formed generation reflection and transmission absorption phenomenon because of its unique material.Chromatic dispersion adopts monochromator to accomplish, and the dispersion element in the monochromator is the optical filter of prism or diffraction grating or spectral resolution.Can adopt sample the respectively spectral signal of different wave length of plural sample window according to needs when adopting optical filter, and a plurality of sample window is along the arrangement that is in line of banknote moving direction.Diffraction grating can adopt transmission grating or reflection grating.When monochromator adopts diffraction grating or prism to make the chromatic dispersion element, also have optical element and slits such as collector lens and collimating mirror in the monochromator.Sensor can adopt linear array or area array sensor, also can adopt light activated elements such as photoelectric cell., the sensor that adopts to sample with the sensor of two above wave bands when being the sensor of different wave length.Signal to sensor sample amplifies.The way of signal amplifier is decided according to system quantity, and the adjustment that gains of digital regulation resistance or analog switch is adopted in the amplifier gain of every road.Amplified analog signal input digit processing unit is carried out the laggard digitized of analog to digital conversion to be handled.According on the banknote direction of motion repeatedly sampling and with the perpendicular direction of direction of motion on the layout of multiple sensor, form on the banknote length and width geometrical plane spectroscopic data matrix with three dimensions of wavelength.Through standard banknote (national nominally issued) being sampled and being stored in digital processing element, form the standard spectrum data of banknote.The data and the normal data wavelength basis dimension of banknote to be identified are carried out related operation respectively, calculate related coefficient, differentiate authenticity of banknotes according to the related coefficient size.
Realized in selected spectral range that through above each step the present invention to the true and false of reflection with transmission absorption CHARACTERISTICS IDENTIFICATION banknote, simple on implementation method, low-cost, false distinguishing is safe and reliable on the performance through banknote.
In sum, the present invention is a kind of banknote false distinguishing method and apparatus based on spectral analysis technique, solves fast, reliably, effectively conterfeit note and adulterium are pieced together the needs of the discriminating of banknote.
Description of drawings
Fig. 1 is an authenticity of banknotes identification device system construction drawing.
Fig. 2 is the diffraction grating structure synoptic diagram for dispersion element in the monochromator.
Fig. 3 is the structural representation of prism for dispersion element in the monochromator.
Fig. 4 adopts a plurality of sample window structural representations in the monochromator.
Fig. 5 is that many group sensor groups are arranged synoptic diagram along banknote motion vertical direction.
Fig. 6 is amplification circuit structure figure.
Fig. 7 is a spectrum false distinguishing method flow diagram.
Embodiment
Device of the present invention can be used for the spectral characteristic of identification check banknote, discerns the false from the genuine through the inspection of spectral characteristic.Include but not limited to following range of application: identifier and/or currency counting and detecting machine and/or cleaning-sorting machine and/or the self-service equipment of depositing and withdrawing.
Exemplarily expressed authenticity of banknotes identification device system construction drawing of the present invention like Fig. 1.This device comprises a light source 4 that shone paper money passage 35; Banknote 3 placed paper money logical; In 35; Comprise a catoptrical reflected light monochromator 2 and a transmitted light monochromator 222 that received the transmitted light of the banknote 3 on the paper money passage 35 that received the banknote 3 on the paper money passage 35; Comprise that first light sensor 1 that docks with reflected light monochromator 2 and second light sensor, 111, the first light sensors 1 that dock with transmitted light monochromator 222 are electrically connected with digitized processing unit 6 through first signal amplifier 5, second light sensor is electrically connected with digitized processing unit 6 through secondary signal amplifier 555.
Referring to Fig. 1, the device course of work is described below: when banknote 3 got into paper money passage 35, light source 4 sends mixed light and is radiated on the banknote 3; Produce reflection and transmission; Reflection ray is received by first light sensor 1 through 2 chromatic dispersions of reflected light monochromator, delivers to first signal amplifier 5 and amplifies, and transmitted ray is received by second light sensor 111 through 222 chromatic dispersions of transmitted light monochromator; Deliver to secondary signal amplifier 555 and amplify, reflection is all sent into digital processing element 6 with transmission signal; When standard banknote (national nominally issued) sampling, preserve its sampled data as standard banknote data; Banknote data to be identified and standard banknote data are carried out correlation analysis, draw its related coefficient, confirm the true and false of banknote to be identified according to the size of related coefficient.Banknote 3 can move in the device of the present invention, is convenient on banknote 3 moving directions, carry out multi-point sampling, and certainly banknote is static also can accomplish discrimination process, and just data volume can be less relatively and can be influenced the representativeness of discriminating.
Light source 4 can also can be used by multiple light courcess for light emitting diode or laser tube or gas discharge lamp tube or heat radiation light source together.Light source 4 wavelength coverages are the combination of any wavelength of infrared light or above-mentioned two wavelength band of ultraviolet light or the 700nm～30000nm of 100nm～420nm.
Adopting reflected light monochromator 2 and transmitted light monochromator 222 to carry out chromatic dispersion among the present invention is a special design of the present invention; In the present embodiment following three kinds of monochromator schemes are described in detail, the applied reflected light monochromator 2 of the present invention includes but not limited to down three kinds of schemes of example with transmitted light monochromator 222:
Fig. 2 is that the dispersion element of monochromator is the structural representation of diffraction grating 8, and reflected light monochromator 2 is identical with the structure of transmitted light monochromator 222, forms by collector lens 11, slit 10, diffraction grating 8, collimating mirror 9, collector lens 7; The transmission or the reflected light that at first adopt a collector lens 11 to receive from banknote 3 surfaces; Lens 11 converge to slit 10 places with light; By collimating mirror 9 light is become directional light then; Directional light is incident to diffraction grating 8, through collector lens 7 diffraction and the multiple order spectrum of interfering acting in conjunction to form is projected on first light sensor 1 or second light sensor 111 again.
Fig. 3 is that the monochromator dispersion element is the structural representation of prism 12; Reflected light monochromator 2 is identical with the structure of transmitted light monochromator 222; Form by collector lens 11, slit 10, prism 12, collimating mirror 9; At first adopt a collector lens 11 to receive transmission or reflected light from banknote 3 surfaces, lens 11 converge to slit 10 places with light, by collimating mirror 9 light are become directional light then; Directional light is incident to prism 12, and prism 12 projects on first light sensor 1 or second light sensor 111 after with the incident light chromatic dispersion.
Fig. 4 adopts a plurality of sample window structural representations in the monochromator; Fig. 5 is that many group sensor groups are arranged synoptic diagram along banknote motion vertical direction; Adopt plural sample window to sample among this embodiment like first sample window 16 and second sample window 17; Place the optical filter of selecting to see through different wave length (like first optical filter 14, second optical filter 15) in each sample window (like first sample window 16 and second sample window 17); A sensor 13, the first optical filters 14, second optical filter 15 are set behind each optical filter can adopt 1 or multi-disc to make up.The peculiar part of this embodiment is a plurality of sample windows (like first sample window 16 and second sample window 17) along banknote 3 moving direction line spread, helps like this in banknote 3 moving process, realizing that a plurality of sample windows (like first sample window 16 and second sample window 17) successively collect same zone on the banknote.As shown in Figure 5, first sample window 16 and second sample window 17 are arranged along banknote 3 moving directions, can certainly arrange two above sample windows.
More than three kinds of monochromator embodiment in device of the present invention, can singly organize use, also can be as shown in Figure 5, many groups are arranged on the perpendicular direction of banknote moving direction, diagram is arranged with 5 groups, can preferably adopt 2 to 6 groups.
First signal amplifier 5 in the present embodiment adopts adjustable amplification with secondary signal amplifier 555; Its circuit structure is as shown in Figure 6; Its unique concept of present embodiment is to realize the adjustable of gain through amplifying element 34 and digital adjustable link 33 that digital adjustable link adopts analog switch or digital regulation resistance to realize.
Referring to Fig. 7, specified the embodiment of authenticity of banknotes discrimination method of the present invention, may further comprise the steps:
1, process hybrid light source irradiation banknote 18 as shown in Figure 7 adopts a hybrid light source to be radiated on the banknote 3, and banknote 3 can produce reflection and transmission absorption phenomenon because of its unique material composition, produces reflection 19 and produces transmission 20 through banknote 3 after the mixed light irradiation;
2, the process as shown in Figure 7 first monochromator chromatic dispersion 21, the second monochromator chromatic dispersion 36 are carried out chromatic dispersion with monochromator to the reflection and the transmitted light of banknote 3;
3, process first sensor receiving spectrum signal as shown in Figure 7 22, the second sensor receiving spectrum signal 37 are measured the light intensity of each wavelength after the chromatic dispersion respectively with sensor;
4, process first amplifier as shown in Figure 7 amplifies 23, second amplifier and amplifies 38, and the signal of sensor sample is amplified.First signal amplifier 5 adopts digital regulation resistance or analog switch to gain with secondary signal amplifier 555 and adjusts 33.
5, process digitized processing 24 as shown in Figure 7 is carried out the laggard digitized of analog to digital conversion with amplified analog signal input digit processing unit 6 and is handled.
6, through standard banknote (national nominally issued) being sampled and being stored in digital processing element 6, the standard spectrum data that form banknote are standard banknote data (reflection) 25 and standard banknote data (transmission) 26.
7, be that standard banknote data (reflection) 25 are carried out correlation analysis 32 respectively with standard banknote data (transmission) 26 wavelength basis dimensions with banknote data 27 to be identified and standard banknote data; Calculate related coefficient; Form the conclusion of similarity high 28 and similarity low 31; Judge that in view of the above banknote to be identified is the result of genuine notes 29 or counterfeit money 30, accomplishes whole discrimination process thus.
Claims (10)
1. banknote false distinguishing method based on spectral analysis technique, it is characterized in that: performing step is following:
(1), selected wavelength coverage is that the hybrid light source of combination of any wavelength of infrared light or above-mentioned two wavelength band of ultraviolet light or the 700nm～30000nm of 100nm～420nm is radiated on the banknote; Banknote produces reflected light and transmitted light; With monochromator the reflected light and the transmitted light of banknote carried out chromatic dispersion, measure reflected light and the light intensity of transmitted light after the chromatic dispersion respectively with sensor;
(2), the signal to sensor sample amplifies;
(3), amplified analog signal input digit processing unit being carried out the laggard digitized of analog to digital conversion handles;
(4), with the data of banknote to be identified with carry out related operation respectively through the standard banknote of national nominally issued being sampled and being stored in the standard spectrum data wavelength basis dimension that digital processing element forms banknote; Calculate related coefficient, differentiate authenticity of banknotes according to the related coefficient size.
2. according to right 1 described banknote false distinguishing method based on spectral analysis technique; It is characterized in that: with the perpendicular direction of banknote moving direction on an above check point is set, thereby many group sampled datas are arranged on the banknote length direction, on the banknote moving direction, repeatedly sample; Thereby repeatedly sampled data is arranged on the banknote Width; As above the spectroscopic data of data and two above wave bands forms a three-dimensional matrice, two physical dimension planes that dimension is a banknote, and the 3rd dimension is wavelength; Digital processing element stores three-dimensional normal data in advance; The data of banknote to be identified and normal data wavelength basis dimension are carried out related operation respectively, calculate related coefficient, confirm authenticity of banknotes according to the related coefficient size.
3. realize the device of the described banknote false distinguishing method based on spectral analysis technique of claim 1; Comprised the paper money passage; It is characterized in that: comprise a described light source of crossing the paper money passage of irradiation; Comprise that at least one receives the described catoptrical reflected light monochromator of crossing the banknote on the paper money passage and receives the described transmitted light monochromator of crossing the transmitted light of the banknote on the paper money passage with at least one; Comprise first light sensor that docks with described reflected light monochromator and second light sensor that docks with described transmitted light monochromator, described first light sensor and second light sensor are electrically connected with the digitized processing unit through a signal amplifier respectively.
4. realization according to claim 3 is based on the device of the banknote false distinguishing method of spectral analysis technique; It is characterized in that: described light source is that wavelength coverage is the ultraviolet source of 100nm～420nm, and described ultraviolet source is gas discharge ultraviolet source or light emitting diode ultraviolet source or laser ultraviolet source.
5. realization according to claim 3 is based on the device of the banknote false distinguishing method of spectral analysis technique; It is characterized in that: described light source is that wavelength coverage is the infrared light light source of 700nm～30000nm, and said infrared light light source is gas discharge infrared light supply or light emitting diode infrared light supply or laser infrared light supply or heat radiation infrared light supply.
6. according to claim 3, the 4 or 5 described realizations device based on the banknote false distinguishing method of spectral analysis technique, it is characterized in that: dispersion element is prism or diffraction grating in described reflected light monochromator and the described transmitted light monochromator.
7. according to claim 3,4 or 5 described realizations device based on the banknote false distinguishing method of spectral analysis technique; It is characterized in that: described reflected light monochromator and described transmitted light monochromator list group are used, or many groups are arranged on the perpendicular direction of banknote moving direction.
8. according to claim 3,4 or 5 described realizations device based on the banknote false distinguishing method of spectral analysis technique; It is characterized in that: the dispersion element of described reflected light monochromator and transmitted light monochromator is an optical filter; Filter system adopts two or more sample windows to combine; Each sample window is placed different optical filters respectively; Each optical filter is selected respectively to see through different-waveband, places photoelectric cell or photosensitive tube sampling behind the optical filter, perhaps places the sensor of selecting to see through different-waveband in each sample window.
9. realization according to claim 8 is characterized in that based on the device of the banknote false distinguishing method of spectral analysis technique: a plurality of described sample windows are along the arrangement that is in line of banknote direction of motion.
10. according to claim 3,4 or 5 described realizations device based on the banknote false distinguishing method of spectral analysis technique; It is characterized in that: described first light sensor and second light sensor are line array sensor or area array sensor or at least two above photoelectric sensor combinations, and described first light sensor and the second light sensor kind comprise: CCD linear array or area array sensor, CIS contact-type image sensor, cmos sensor, photoelectric cell, photosensitive tube.
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