CN1404020A - Bill truth laser inspecting method and laser bill inspecting device - Google Patents
Bill truth laser inspecting method and laser bill inspecting device Download PDFInfo
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- CN1404020A CN1404020A CN02138438A CN02138438A CN1404020A CN 1404020 A CN1404020 A CN 1404020A CN 02138438 A CN02138438 A CN 02138438A CN 02138438 A CN02138438 A CN 02138438A CN 1404020 A CN1404020 A CN 1404020A
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- laser
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Abstract
The present invention relates to bill paper currency truth laser inspecting method and laser paper currency inspecting device and belongs to the field of optical anti-fake technology specific luminous Strokes material and luminous anti-Strokes RE material are hidden in some rule inside paper currency to form the "luminous information code" with different optical characteristic, the "Luminou s information code" is illuminated with laser in corresponding wavelength and the quantitative optical characteristic signal of the "luminous information code" is detected with optical sensor and converted into electric signal, and the electric signal is processed in a computer to obtain the paper currency truth detecting result. The laser paper currency inspecting device consists of laser source, photosensitive sensor and processor.
Description
Technical field
The present invention relates to a kind of bank note, security, tax reciept and classified document etc. be carried out quantitative Jianzhen's method, the invention still further relates to the laser bill inspecting device of realizing this method, belong to the optical anti-counterfeiting technical field.
Background technology
Banknote optical anti-counterfeiting technology at present commonly used has fluorescence and phosphor ink printing, this technology dollar, Euro and Renminbi in application is all arranged.And along with the continuous development of science and technology, correlation technique is also constantly making progress.
For example, the Chinese patent application that application number is 97181461.9, name is called " equipment and method that detect fluorescence and phosphorescence " disclose a kind of sensor respectively during the exposing of pulse excitation light and pulse excitation light dark mutually during the equipment of the light intensity sent of detection sheet material.This equipment is by means of computing machine, can according to the pulse excitation light mutually and secretly mutually in detected intensity derivation fluorescence luminous intensity and phosphorescent luminous intensity, the action effect that therefore has the raising antifalsification.
And for example, the Chinese patent body application that application number is 99800095.7, name is called " the valuable printed text that luminous discriminating facility are arranged " then discloses a kind of based on the luminescent substance that is doped with at least a rare earth metal host lattice.This luminescent substance is present in the valuable document with specific concentrations so that the characteristic of valuable document just keeps not damaging, like this from another angle to anti-counterfeiting technology progress make contributions.
Yet, understand according to the applicant, existing optical anti-counterfeiting technology all can only be made qualitative detection, be that the signal criterion of bank machine when machine-readable is " having " and " nothing " of fluorescence (or phosphorescence) printing ink, and can not carry out the refinement analysis to the essence of detection signal, therefore do not have the Jianzhen of non-those fluorescence of this fluorescence of judgement and false proof uniqueness.Theoretically, the machine-readable signal that does not possess uniqueness is unsafe, and the fake producer still has the opportunity of mixing the spurious with the genuine.
Summary of the invention
The objective of the invention is to: provide a kind of quantitative authenticating method of banknote laser that can carry out quantitative test, thereby the Jianzhen of realization uniqueness and false proof has no exploits the fake producer detection signal.Simultaneously, it is quantitatively machine-readable and verify the laser bill inspecting device of its uniqueness that the present invention also will provide a kind of energy.
As everyone knows, the rare earth element in the chemical periodic table from the lanthanum to the lutetium is filled electronics in the internal layer 4f track, as a result lanthanum (4f one by one along with the increase of atomic number from 57 to 71
0) to lutetium (4f
14) the transition campaign that between different energy levels, takes place of 4f electronics, make the luminous and light absorption of rare earth element peculiar.Scientific research proves to have 13 (Ce of underfill 4f electronics
3+To Yb
3+) 4f of trivalent rare earth ions
nIn the configuration (n=1～13), have 1639 energy levels, contingent transition number is up to 192177 between the different energy levels.In addition, the special electronic structure of rare earth element also makes it have the unusual fluorescence phenomenon of anti-Stokes effect.Therefore, the applicant recognizes that rare earth element is the huge optical information treasure-house that can excavate.
Stokes' law is thought, the wavelength of transmitted light of luminescent material is generally always greater than exciting light wavelength, the photon energy of stimulated luminescence is less than the energy of excitation photon usually in other words, and the wavelength of transmitted light of luminescent material is shorter than the abnormal phenomena of excitation wavelength, is called the anti-Stokes effect.Have purpose to be combined in the banknote Stokes luminescent material and anti-Stokes luminescence material, its machine-readable difficulty will greatly improve, thereby make fake producer's imitation hardly may.
On above understanding basis, the applicant has proposed the quantitative authenticating method of banknote laser of the present invention: specific Stokes luminescent material and anti-Stokes rare earth luminescent material are distributed in the banknote class thing to be identified by the setting rule is hiding, formation can quantize " illuminated message coding " in theory by what the different optical eigenwert was formed, excitation source irradiation " illuminated message coding " with corresponding wavelength, receive the quantitative optical characteristic value data that contains in the fluorescence that luminescent material is excited to send in " illuminated message coding " with light sensor, and convert thereof into corresponding electric signal, send into computing machine and quantifiable data comparison in theory, draw the Jianzhen result of uniqueness checking.
Setting rule in the inventive method can be the special pattern pattern and the regularity of distribution thereof, the mode that hide to distribute can be with ink printing in banknote surface, make safety line or safety disc is imbedded in the paper money paper, makes the safety film blanching on the banknote top layer, optical feature value comprises characteristic peaks wavelength, fluorescence decay time, and both combinations, for the luminescent material of many characteristic peaks, also comprise the intensity of each characteristic peaks etc.
The laser bill inspecting device of realizing the inventive method is mainly by the excitation source that sends exciting light, light signal is converted into the light sensor or the sensor groups of analog electrical signal, store the storer of banknote class thing standard form to be detected information, and the processor that contains computing machine is formed, excitation source lays respectively at the other relative position of thing passage to be identified with corresponding light sensor, the power end of the control termination excitation source of processor, therefore can be to the luminous intensity of excitaton source, fluorescent lifetime is controlled, the signal output part of light sensor connects the identification signal input end of processor, the quantity of excitation source, arrange and the wavelength of each excitation source corresponds respectively to the species number of contained specific Stokes and anti-Stokes rare earth luminescent material in the thing to be identified, the regularity of distribution with and excitation wavelength.Specifically, above-mentioned " relative position " is positioned at a passage two sides or a side for the thing to be identified of matrix light-permeable; For the light tight thing to be identified of matrix, be positioned at passage one side.
Generally speaking, the present invention utilizes the optical specificity of rare earth element, form " the illuminated message coding " of original creation, measure by datumization again its characteristic peaks wavelength, fluorescence decay time, realized that banknote class thing Jianzhen to be identified anti-counterfeiting technology is by " qualitative " leap to " quantitatively ", provide have genuine piece uniqueness standard, the very reliable Jianzhen's method for anti-counterfeit of new generation of security, also proposed simultaneously to realize the laser bill inspecting device of this method, thereby laid a good foundation for of the present invention applying.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is thing to be identified " illuminated message coding " synoptic diagram of the embodiment of the invention one.
Fig. 2 is that the present invention distinguishes the used laser bill inspecting device structured flowchart of Fig. 1 embodiment.
Fig. 3 is the structural representation of sensor and excitation source array portion in Fig. 2 laser bill inspecting device.
Embodiment
Embodiment one
Present embodiment is one of the present invention and simplifies application example:---gallium acid magnesium: manganese (II) and anti-Stokes rare earth luminescent material a '---lanthana: ytterbium (III) with Stokes luminescent material a, erbium (III), make latent printing ink respectively, by hiding banknote class thing to be identified 4 surfaces that are imprinted on of " Lu " font regularity of distribution shown in Figure 1, " illuminated message coding "---the photoluminescence peak wavelength that is stimulated in theory is 503nm and 660nm in formation, shine " illuminated message coding " with the ultraviolet light of wavelength 253.7nm and the infrared light of wavelength 940nm as excitation source respectively, receive the photoluminescence peak wavelength that luminescent material is excited to send in " illuminated message coding " with optical sensor, and convert thereof into corresponding electric signal, send into the computing machine and the photoluminescence peak wavelength quantized data 503nm that is stimulated in theory, 660nm compares, identical as comparing result, then can be derived as the uniqueness Jianzhen result of " very ".
The laser bill inspecting device (referring to Fig. 2) that is used to distinguish Fig. 1 banknote class thing to be identified is made up of excitation source array, light sensor arrays and processor, and processor comprises that pretreatment unit, multi-way switch, A/D converter, device are provided with switch, storer, both-way communication interface, unit state difference device, CPU.
The function of each major part can be sketched and be: 1) light sensor arrays each luminescent material that will receive specific wavelength light signal of being excited to be sent is converted into analog electrical signal.Wherein specific sensor groups only detects the light wave of corresponding wavelength scope, and is insensitive to the excitation source wavelength.2) pretreatment unit essence is that a high s/n ratio, Gao Xingtong can the Gain Adjustable operational amplification circuits, be used for the faint simulating signal that sensor array is sent here amplify, shaping, promptly carry out exporting central processing unit to after the standardization.3) CPU finally does with analysis and judgement and coordinates the core cell of whole facility.4) A/D converter is used for the treated simulating signal of pretreatment unit output is transformed into the discernible binary digit amount of microprocessor.Composition situations such as it connects each other as shown in Figure 2, the power end of the control termination excitation source of processor wherein, the signal output part of light sensor connects the identification signal input end of processor, more than each major part and multi-way switch, device concrete structure and annexation that parts such as switch, storer, both-way communication interface, unit state difference device are set duplicate with existing Related product, do not give unnecessary details in addition herein.
What need stress is that the wavelength of quantity, arrangement and each excitation source of excitation source corresponds respectively to Stokes rare earth luminescent material in the thing to be identified---gallium acid magnesium: manganese (II) and anti-Stokes rare earth luminescent material---lanthana: ytterbium (III), erbium (III) (La
2O
3: Yb
3+, Er
3+) relevant parameter, specifically, excitation source is used the ultraviolet light of wavelength 253.7nm and the infrared light of wavelength 940nm respectively.As shown in Figure 3, excitation source and light sensor arrays 6,2 lay respectively at the both sides up and down of banknote class thing 4 to be identified.Install by the excitation source array in the excitation source housing 7 of downside---ultraviolet light 6 and infrared light 6 '.In order to strengthen excitating light strength, bar shaped condenser 5 is equipped with on excitation source housing 7 tops.Light sensor arrays 2 corresponding to the excitation source array is installed in the sensor housing 1 of upside.For the light wave that makes 2 detections of light sensor have particular range of wavelengths, and insensitive, the bandpass filter 3 of required wavelength is housed in sensor housing 1 bottom of photosensitive sensor groups to the excitation source wavelength.
When the banknote class thing to be identified that contains " illuminated message coding " during by the passage between excitation source and the light sensor arrays, specific ultraviolet light that the excitation source array sends and infrared light shine respectively on the thing to be identified by gallium acid magnesium: manganese (II) and lanthana: ytterbium (III), " the illuminated message coding " that erbium (III) printing ink is printed, " illuminated message coding " luminescent material is excited to send the fluorescence of specific wavelength, accepted to be transformed into analog electrical signal by light sensor arrays, be transferred in the processor, amplify through pretreatment unit, shaping, convert digital signal to by A/D converter again, deliver among the CPU with storer in the gross data comparative analysis, draw Jianzhen's conclusion.
Because the Stokes luminescent material on banknote class thing to be identified surface and anti-Stokes rare earth luminescent material, hybrid coding mode, the excitation source array way of " illuminated message coding ", the array way that excites light wavelength, light sensor, the gross data in the processor etc. all are in external confidential state, especially drawing of Jianzhen's conclusion is not by judging " have, do not have ", but produce through quantizing detection analysis, therefore can not draw the specious conclusion that gets, uniqueness with Jianzhen's conclusion can effectively be stopped to fake.
Obviously, anti-Stokes rare earth luminescent material---the La in the present embodiment
2O
3: Yb
3+, Er
3+Also can adopt other rare earth oxyhalide oxide to replace, for example Y
2O
3: Yb
3+, Er
3+, Gd
2O
3: Yb
3+Deng.
Embodiment two
Present embodiment is compared with embodiment one, except " illuminated message coding " adopts comparatively complicated striped coded system, the main difference part is: 1, fluorescence material ZnS:Ag is by adjusting exciting agent Ag content, can produce the fluorescence (claiming phosphorescence again) of μ s after times 5～hundreds of μ s, present embodiment will be adjusted to 0.5ms after time, with the fluorescence decay time is optical feature value, joins in the establishment " illuminated message coding "; 2, the mode that is hidden in the banknote class thing to be identified of luminescent material is imbedded in the paper money paper for making safety line or safety disc; 3, for make excitation source in the laser bill inspecting device expose and the dark phase time accurately controlled, excitation source adopts semiconductor laser transmitter, can satisfy the miniaturization of the accurately controlled and facility of fluorescent lifetime like this.
Present embodiment is with fluorescence decay time or claim the phosphorescence coding techniques to use in Jianzhen's identification, has the following advantages:
1. have the bicharacteristic of tool characteristic wavelength and after time concurrently, safer;
2. machine-readable property is good, can distinguish information in the coding easily by computer technology;
3. information content is big, owing to increased the coding figure place, therefore can be easy to add the information of various needs.
Embodiment three
Present embodiment is compared with embodiment one, except " illuminated message coding " adopts comparatively complicated striped coded system, the main difference part is: 1, the anti-Stokes rare earth luminescent material adopts the yttrium fluoride in the rare earth fluoride: ytterbium (III), erbium (III), i.e. YF
3: Yb
3+, Er
3+(other rare earth fluorides or rare earth and alkali-metal composite fluoride, for example NaYF certainly,
4: Yb
3+, Er
3+, also be fine); 946～976 μ m are exciting light with infrared ray, and the characteristic peaks wavelength is the red fluorescence of 545 μ m green fluorescences and 660 μ m, and strength ratio is 5: 1; 2, luminescent material is hidden in mode in the banknote class thing to be identified for making the safety film blanching on the banknote top layer.
Experimental results show that, coding of the present invention and array mode are flexible and changeable, can set according to actual conditions and needs, compare, owing to adopted the method for quantitative comparative analysis with existing various qualitative anti-counterfeiting technologies, therefore scientific and crypticity all improves greatly, and have the uniqueness of quantitative criterion, thus can effectively contain false making, obtain desirable Jianzhen's antifalse effect, after estimate releasing, will become the false proof measure of a kind of brand-new Jianzhen and applied.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of requirement of the present invention.
Claims (13)
1. quantitative authenticating method of banknote laser, it is characterized in that: specific Stokes luminescent material and anti-Stokes rare earth luminescent material are distributed in the banknote class thing to be identified by the setting rule is hiding, formation can quantize " illuminated message coding " in theory by what the different optical eigenwert was formed, excitation source irradiation " illuminated message coding " with corresponding wavelength, receive the quantitative optical characteristic value data that contains in the fluorescence that luminescent material is excited to send in " illuminated message coding " with optical sensor, and convert thereof into corresponding electric signal, send into computing machine and quantifiable data comparison in theory, draw the Jianzhen result of uniqueness checking.
2. according to the quantitative authenticating method of the described banknote laser of claim 1, it is characterized in that: described optical feature value is the characteristic peaks wavelength.
3. according to the quantitative authenticating method of the described banknote laser of claim 1, it is characterized in that: described optical feature value is a fluorescence decay time.
4. according to the quantitative authenticating method of the described banknote laser of claim 1, it is characterized in that: described optical feature value is the combination of characteristic peaks wavelength and fluorescence decay time.
5. according to the quantitative authenticating method of the described banknote laser of claim 1, it is characterized in that: described rare earth luminescent material is the rare earth fluoride that comprises rare earth and alkali-metal composite fluoride.
6. according to the quantitative authenticating method of the described banknote laser of claim 1, it is characterized in that: described rare earth luminescent material is the rare earth oxide that comprises complex rare-earth oxidate containing valuable metal.
7. according to the quantitative authenticating method of the arbitrary described banknote laser of claim 1 to 6, it is characterized in that: described being hidden in the banknote to using ink printing in banknote surface.
8. according to the quantitative authenticating method of the arbitrary described banknote laser of claim 1 to 6, it is characterized in that: described being hidden in the banknote is imbedded in the paper money paper for making safety line or safety disc.
9. according to the quantitative authenticating method of the arbitrary described banknote laser of claim 1 to 6, it is characterized in that: described being hidden in the banknote to making the safety film blanching on the banknote top layer.
10. laser bill inspecting device, main by the excitation source that sends exciting light, light signal is converted into the light sensor or the sensor groups of analog electrical signal, store the storer of banknote class thing standard form to be detected information, and the processor that contains computing machine is formed, excitation source lays respectively at the other relative position of thing passage to be identified with corresponding light sensor, the power end of the control termination excitation source of processor, the signal output part of light sensor connects the identification signal input end of processor, it is characterized in that: the quantity of described excitation source, arrange and the wavelength of each excitation source corresponds respectively to the species number of contained specific Stokes and anti-Stokes rare earth luminescent material in the thing to be identified, the regularity of distribution with and excitation wavelength.
11, according to the described laser bill inspecting device of claim 10, it is characterized in that: described processor comprises the pretreatment unit of amplification from the sensor die analog signal, to be transformed into the A/D converter of digital signal from the pretreatment unit simulating signal, and be used for analysis and judgement and coordinate the CPU of whole facility.
12, according to the described laser bill inspecting device of claim 10, it is characterized in that: described excitation source adopts and exposes and accurate controlled semiconductor laser transmitter of dark phase time.
13, the machine-readable facility of laser according to claim 10, it is characterized in that: described light sensor is assembled with the bandpass filter of required wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB02138438XA CN1191555C (en) | 2002-10-15 | 2002-10-15 | Bill truth laser inspecting method and laser bill inspecting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB02138438XA CN1191555C (en) | 2002-10-15 | 2002-10-15 | Bill truth laser inspecting method and laser bill inspecting device |
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|---|---|
| CN1404020A true CN1404020A (en) | 2003-03-19 |
| CN1191555C CN1191555C (en) | 2005-03-02 |
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|---|---|---|---|
| CNB02138438XA Expired - Fee Related CN1191555C (en) | 2002-10-15 | 2002-10-15 | Bill truth laser inspecting method and laser bill inspecting device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101297190B (en) * | 2005-02-18 | 2012-01-18 | 美洲染料资源公司 | Method for encoding materials with a luminescent tag and apparatus for reading same |
| CN102909988A (en) * | 2012-10-31 | 2013-02-06 | 中国人民银行印制科学技术研究所 | Valuable document and identification method thereof |
-
2002
- 2002-10-15 CN CNB02138438XA patent/CN1191555C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101297190B (en) * | 2005-02-18 | 2012-01-18 | 美洲染料资源公司 | Method for encoding materials with a luminescent tag and apparatus for reading same |
| CN102909988A (en) * | 2012-10-31 | 2013-02-06 | 中国人民银行印制科学技术研究所 | Valuable document and identification method thereof |
| CN102909988B (en) * | 2012-10-31 | 2015-01-21 | 中国人民银行印制科学技术研究所 | Valuable document and identification method thereof |
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| Publication number | Publication date |
|---|---|
| CN1191555C (en) | 2005-03-02 |
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