CN1397795A - Method and instrument for detecting infrared ascending conversion material - Google Patents
Method and instrument for detecting infrared ascending conversion material Download PDFInfo
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- CN1397795A CN1397795A CN 02138137 CN02138137A CN1397795A CN 1397795 A CN1397795 A CN 1397795A CN 02138137 CN02138137 CN 02138137 CN 02138137 A CN02138137 A CN 02138137A CN 1397795 A CN1397795 A CN 1397795A
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Abstract
A method and equipment for detecting the infrared converting material used for antiforge purpose features that the infrared beams from infrared laser device are focused on the surface of the said material, its reflected light is incident upon a visual light detector for converting the optical signals to electric ones, and after A/D conversion the digital signals are output.
Description
Technical field
The present invention relates to a kind of detection method and implement device thereof of infrared up-conversion material, be specially adapted to applications such as anti-counterfeiting detection, commodity classification and hide information storage detection.
Background technology
Excite a kind of material with infrared light, produce visible light, absorbed two-photon or multi-photon, the photon energy of the visible light of generation is higher than the photon energy of exciting light, and this process is called transfer process (UP CONVERSION).Accompanying drawing 1 has provided the principle schematic of last transfer process.
Although last conversion phenomena was just once observed in polycrystalline ZnS as far back as nineteen fifty-nine, but because early stage best up-conversion luminescence efficiency is no more than 1 ‰, and because the excitation peak of the emission peak of light emitting diode and up-conversion coupling is not satisfactory, therefore do not reach the level of practicability, the beginning of the nineties, because the appearance of high-power LD and increasingly mature, at room temperature simultaneously, successfully obtained laser operation at crystal of fluoride, light-light conversion efficiency surpasses 1%, thereby the infrared laser up-conversion is being shown, fields such as photometry calculation and information processing have shown practical widely prospect.
The energy of the photon that up-conversion is luminous compares the energy height of the photon that is absorbed, the high-energy photons of emission excites and produces by absorbing a plurality of energy photons, because the 4f energy level of rare earth element has transition energy level widely, efficient up-conversion luminescent material therefore commonly used both at home and abroad at present is rare earth compound or rear-earth-doped material.Rare earth compound is with the main constituent (as Ba2ErCl7, BaLn2F8 etc.) of rare earth as material, and the luminescence efficiency height is with high costs, only is used for laser output material; Rear-earth-doped material is a host material with oxide, fluoride, chloride and sulfide then, carries out rear-earth-dopedly on host material, realizes up-conversion luminescence.At present, can synthesize the up-conversion of red, green, blue, the system of being synthesized has sulfide doped with rare-earth elements system and fluoride-doped rare earth element system.
Because the printing ink with the infrared up-conversion material configuration is colourless, and the infrared light supply of excitation also is invisible to the human eye, therefore this material obviously has basic anti-counterfeiting mark function, compare with present widely used burst of ultraviolel luminous mark material, the infrared conversion marking materials synthetic ingredient complexity that goes up, the technical requirement height is difficult to copy, 1997, the infrared anti-false technology was put into 10 anti-counterfeiting technologies (GB/T17004-1997) of State Standard of the People's Republic of China.Use the infrared laser of high-level efficiency up-conversion and less expensive to realize its luminescence process, reach sign, false proof purpose, because of its good concealment, long service life, material preparation technology difficulty height is difficult for by imitated, is an anti-counterfeiting technology that technology content is high, can be applicable to the false proof of the packing of delivery of books, all kinds of name brand, brand product and certificate and bank card, credit card even Renminbi, also can satisfy the false proof requirement of sign of other special trade.
Semiconductor infrared laser (LD) is mainly used in the detection of infrared up-conversion material, and the wavelength of selection laser instrument is in the sensitive volume that excites of material, and the power of laser and beam focus size will have influence on the efficient of material to the visible light conversion.Accompanying drawing 2 has provided and with the semiconductor infrared laser up-conversion has been excited and send the photo of visible light.
Yet, present detection to infrared up-conversion material, resting on infrared laser excites the back to adopt the macroscopic stage, owing to detect and be confined to artificial judgment, can only make the qualitative judgement result who has or not infrared up-conversion material usually, thereby, be used for when false proof, limitation is bigger, in case the counterfeiter grasps infrared up-conversion material is arranged, and can make false proof inefficacy; Simultaneously, this simple qualitative judgement also can't further expand the range of application of infrared up-conversion material.
Summary of the invention
The object of the invention provides a kind of detection method of infrared up-conversion material, can adopt computing machine that infrared up-conversion material is carried out detection by quantitative by this method, and can judge and utilize the color that infrared up-conversion material forms or the coded combination of position, thereby the enhancing anti-counterfeiting performance, and make the hide information storage of adopting infrared up-conversion material become possibility;
Further aim of the present invention is that a kind of device of realizing infrared up-conversion material is carried out detection by quantitative is provided.
For achieving the above object, the technical solution used in the present invention is: a kind of detection method of infrared up-conversion material, the infrared beam that infrared laser is sent focuses on the surface of infrared up-conversion material, reflected light is incided on the visible-light detector, convert light signal to electric signal by detector, output digital signal after amplifying.
In the technique scheme, described " infrared laser " is meant and sends the laser instrument that wavelength coverage is the infrared light of 850nm-1550nm, usually can adopt semiconductor iraser (LD), the infrared light that this infrared laser sends should focus on the surface of infrared up-conversion material, make material be subjected to high strength infrared ray excited after, partly convert infrared light to visible light, detect for detector; Described " visible-light detector " is meant that at visible region higher spectral response is arranged, and the very low detector of the detection sensitivity under infrared excitation light, and detector can not influence testing result because of the interference of the infrared light of reflection; Described " digital signal " is meant the signal of expressing visible light intensity, it both can be one signal, be used to express having or not of visible light, it also can be the multistation digital signal that is used to express visual intensity, this signal can be received and analyze by computing machine, and the computing machine here both can be general PC, also can be special machine (as cashier's machine), can also be Single Chip Microcomputer (SCM) system, as long as include processor.
In the technique scheme,, before reflected light incides visible-light detector, can pass through narrow-band filtering, make and have only the light signal of designated band to be detected by this detector for further reducing the interference of bias light.
Further technical scheme is used for the detection of multiwave up-conversion, includes at least two group detection systems, and every group of detection system can detect the light signal of different-waveband, and compares its intensity by computing machine after changing.
Realize the pick-up unit of the infrared up-conversion material of above-mentioned detection method, comprise iraser and lens, detected material is positioned on the focus point of infrared light through lens formation of described iraser emission, also include visible-light detector, described visible-light detector is positioned on the catoptrical light path, and its output terminal is connected with A/D converter.
In the technique scheme, can before visible-light detector, be provided with narrow band pass filter.The visible light wave range that sends after the high permeability of narrow band pass filter (claiming narrowband light filter or wave filter again) should excite corresponding to up-conversion, under its all band, especially under other excitation wavelength, optical filter should have extremely low transmitance, makes that optical filter only can be by a kind of light wave of wave band.Usually, because the light-light conversion efficiency of up-conversion is about %, therefore, narrow band pass filter should be higher than 80% at the peak transmittance of visible light exclusive band, and the transmitance under infrared band is below 0.1%.
In the technique scheme, when being used for the detection of multiband infrared up-conversion material, be provided with at least 2 group sniffers, every group of sniffer is made of narrow band pass filter, visible-light detector and A/D converter respectively, and the high permeability of its narrow band pass filter corresponds respectively to a plurality of visible light wave ranges that infrared up-conversion material sends.
In the technique scheme, common situation is to be provided with 3 groups of described sniffers, and it detects wave band and is respectively ruddiness, green glow, blue light.
In the technique scheme, can also include integrating sphere, described integrating sphere is positioned between the surface of infrared laser light path and infrared up-conversion material, and the narrow band pass filter in the described sniffer contacts with the integrating sphere surface.The effect of integrating sphere is, first, guarantee that incident beam focuses on the up-conversion surface, make the visible light that inspires the strongest, the second, the light that reflects from material, the light on being directly incident on detector, other light repeatedly reflects by integrating sphere, not only makes to incide light intensity homogenising on the detector, also increases the intensity of detector glazed thread.
The another kind of pick-up unit of realizing the infrared up-conversion material of above-mentioned detection method, comprise infrared laser, arrowband reflecting piece, microscope and visible-light detector, the infrared light that described infrared laser sends is after the reflection of arrowband reflecting piece, focus on the up-conversion surface by microscope, visible light reflected back microscope, and transmission crosses the arrowband reflecting piece, and described visible-light detector is positioned on the transmitted light path of arrowband reflecting piece, and the output terminal of visible-light detector is connected with A/D converter.
In the technique scheme, when being used for the detection of multiband infrared up-conversion material, on the transmitted light path of described arrowband reflecting piece, be provided with the arrowband reflecting piece of at least 2 different-wavebands, on its reflected light path, be respectively equipped with visible-light detector and corresponding A/D converter, disturb for further reducing, corresponding narrow band pass filter can be set before each visible-light detector.
When using, infrared up-conversion material can be incorporated in the water white transparency printing ink by a certain percentage, then, print on the printed matter, the blending ratio should make the luminous intensity of material reach or be higher than the detection sensitivity of detecting device.Present normally used infrared up-conversion material is to excite under single infrared laser, produces single wave band visible light (as red, green, blue etc.); For strengthening false proof or information is carried performance, also can use multiband luminous (visible light) up-conversion, the luminous infrared up-conversion material of so-called multiband is meant at single infrared laser and excites down, has the performance of the visible light of changing two kinds and two or more wave bands simultaneously.Utilize method of the present invention to detect, can handle, compare, make the true and false and judge with the data of storing by single-chip microcomputer or multi-purpose computer.
Because the technique scheme utilization, the present invention compared with prior art has following advantage:
1. because the visible light that the present invention can inspire infrared up-conversion material converts the accessible digital signal of computing machine to, thereby can directly handle, thereby make the infrared up-conversion material anti-counterfeiting detection more convenient and effective to infrared up-conversion material and coding thereof etc.;
2, the present invention can be provided with the multichannel pick-up unit, detect the visible light that excites of a plurality of different-wavebands simultaneously, thereby can detect the luminous up-conversion of multiband, because the luminous up-conversion of multiband is synthetic very difficult, and the luminous ratio of different-waveband can detection by quantitative, thereby has good anti-counterfeiting performance.
Description of drawings
The visible light luminous photo that accompanying drawing 2 excites up-conversion for infrared laser;
Accompanying drawing 3 is the structural representation of the embodiment of the invention one;
Accompanying drawing 4 is the structural representation of the embodiment of the invention two;
Accompanying drawing 5 is the structural representation of the embodiment of the invention three.
Accompanying drawing 6 is the schematic top plan view of integrating sphere part among Fig. 5;
Accompanying drawing 7 is the light transmission rate curve map of narrow band pass filter among the embodiment three;
Accompanying drawing 8 is the spectral response curve figure of visible-light detector;
Accompanying drawing 9 is the structural representation of the embodiment of the invention four.
Wherein: [1], infrared laser; [2], lens; [3], up-conversion; [4], integrating sphere; [5], narrow band pass filter; [6], detector; [7], Single Chip Microcomputer (SCM) system; [8], display; [9], narrow band pass filter; [10], detector; [11], narrow band pass filter; [12], detector; [13], microscope; [14], arrowband reflecting piece; [15], arrowband reflecting piece; [16], arrowband reflecting piece; [17], bracing frame.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment one: shown in accompanying drawing 3, a kind of pick-up unit of infrared up-conversion material, comprise infrared laser 1, lens 2, bracing frame 17 (also can adopt integrating sphere) and detector 6, infrared laser 1 sends infrared beam (as 980nm, scope is that the 850-1550nm infrared light all can be used for exciting), through behind the lens 2, shine on the up-conversion 3, focal spot is on material surface, because focal infrared light intensity height, material be subjected to high strength infrared ray excited after, partly convert infrared light to visible light, visible light is after material surface reflection, visible light incides on the detector 6, detector converts light signal to electric signal, through conversion and processing, makes genuine/counterfeit discriminating on display 8.
Embodiment two: shown in accompanying drawing 4, a kind of pick-up unit of infrared up-conversion material, comprise infrared laser 1, lens 2, integrating sphere 4 (also can be bracing frame) and detector 6, infrared laser 1 sends infrared beam (as 980nm, scope is that the 850-1550nm infrared light all can be used for exciting), through behind the lens 2, shine on the up-conversion 3, focal spot is on material surface, because focal infrared light intensity height, material be subjected to high strength infrared ray excited after, partly convert infrared light to visible light, visible light is after the material surface reflection, to integrating sphere 4, simultaneously, visible light also incides on the narrow band pass filter 5, incide on the detector 6 through behind the narrow-band-filter, detector converts light signal to electric signal, handles through A/D conversion and single-chip microcomputer, makes genuine/counterfeit discriminating on display 8, among the figure, Single Chip Microcomputer (SCM) system 7 has comprised the A/D change-over circuit, singlechip chip and necessary peripheral circuit.
In the pick-up unit of present embodiment, the peak transmittance of narrow band pass filter 5 is very important with the corresponding of the visible light wave range that is inspired, be that a kind of detecting device will only be surveyed the up-conversion that a class has the identical characteristics of luminescence, in other words, the detecting device of surveying green color can not be used for detecting red, but for all up-conversions with energy glow green, detecting device is indistinguishable, therefore, only surveying the light intensity of single wave band, is far from being enough for anti-counterfeiting detection.
Embodiment three: referring to accompanying drawing 5 to shown in the accompanying drawing 7, a kind of pick-up unit of infrared up-conversion material, comprise infrared laser 1, lens 2, integrating sphere 4 and No. three detectors, infrared laser 1 sends infrared beam, after lens 2 focusing, shine on the up-conversion 3, focus point on material surface, material be subjected to high strength infrared ray excited after, convert the part infrared light to visible light, visible light is after the material surface reflection, to integrating sphere 4, simultaneously, visible light also incides narrow band pass filter 5, on 9, incide detector 6 through behind the narrow-band-filter, on 10, detector converts light signal to electric signal, handles through A/D conversion and singlechip chip, draws the intensity on each detector, then, on display 8, make genuine/counterfeit discriminating.Narrow band pass filter 11 and detector 12 as standby, as narrow band pass filter filtering visible light, only detect infrared light intensity, handle as the heterodyne of visible light detecting.
In excitation process, because the conversion efficiency of material is limited, only some infrared light be converted into visible light, most infrared excitation light still is reflected, though, people's eyes can not be observed infrared light, but the light intensity of the infrared light that reflects is still greater than the visible light light intensity, therefore, must adopt an effective measure and reduce the interference of exciting light, before the arrival detector, filter out infrared light, with visible light transmissive.Taked two measures in the present embodiment, the first, adopt narrow band pass filter, the second, being chosen in visible region has higher spectral response, simultaneously the very low detector of detection sensitivity under infrared excitation light.
Wherein, the high permeability of narrow band pass filter 5,9 corresponds respectively to the visible light wave range that sends after up-conversion excites, under its all band, especially under excitation wavelength, wave filter should have extremely low transmitance, makes that filter plate only can be by a kind of light wave of wave band.Usually, because the light-light conversion efficiency of up-conversion is about 1%, therefore, narrow band filter should be higher than 80% at the peak transmittance of visible light exclusive band, and the transmitance under infrared band is below 0.1%.Provided the light transmission rate curve of two kinds of narrow band pass filters commonly used in the accompanying drawing 6, corresponding to the 530-550nm wave band, has good transmitance as narrow band pass filter 5, under its all band, transmitance is very low, narrow band pass filter 9 has fine transmitance at red wave band, and is very low in its all band transmitance, like this, through after the filtering, detector 6,10 detects the visible light of different optical bands respectively, simultaneously, has filtered out infrared excitation light.
Accompanying drawing 7 has provided the spectral response curve of the detector of selecting for use.To be in the spectrum sensitivity district of detector from the light that sees through of narrow band pass filter 5,9, in the infrared light district, the spectral response sensitivity of detector is very little.
In the present embodiment, increase the quantity of detector and wave filter, simultaneously, increase the visible luminous wave band of up-conversion, this detecting device has just become the multiband detecting device.
The pick-up unit of present embodiment not only can detect multiwave light intensity ratio, also can detect corresponding single red or green wave band respectively.Therefore be a kind of multi-functional pick-up unit.
Embodiment four: shown in accompanying drawing 8, a kind of multiwave infrared up-conversion material pick-up unit, be two waveband confocal fluorescent detection system, infrared laser beam 1 is through arrowband reflecting piece 14, this arrowband reflecting piece 14 is the reflective infrared exciting light only, laser focuses on the infrared up-conversion material 3 by microscope 13, material sends the visible light of two waveband through exciting, and returns microscope 13 again after the visible light reflection, because the visible light that inspires, not in the scope of arrowband reflecting piece 14, thereby, will be through arrowband reflecting piece 14, after arrowband reflecting piece 15 (as corresponding to ruddiness), one road light arrives detector 6; Other one the tunnel, through arrowband reflecting piece 16, arrive detector 10, the signal of detector is made genuine/counterfeit discriminating after chip is handled.Though the wide part of the infrared excitation from the light that material returns is filtered, but still some light transmission arrowband reflecting piece 14, therefore, narrow band pass filter 5,9 is with further filtering exciting light.
Also can further increase arrowband reflecting piece, optical filter and detector in the present embodiment, as the detection of multiwave infrared up-conversion material.
Claims (10)
1. the detection method of an infrared up-conversion material, it is characterized in that: the infrared beam that infrared laser [1] is sent focuses on the surface of infrared up-conversion material [3], reflected light is incided on the visible-light detector [6], convert light signal to electric signal by detector [6], output digital signal after amplifying.
2. the detection method of infrared up-conversion material as claimed in claim 1 is characterized in that: before reflected light incides visible-light detector, through narrow-band filtering [5], make and have only the light signal of designated band to be detected by this detector.
3. the detection method of infrared up-conversion material as claimed in claim 2, it is characterized in that: include at least two group detection systems, every group of detection system can detect the light signal of different-waveband, and through A/D conversion back by its intensity of computing machine comparison.
4. the pick-up unit of an infrared up-conversion material, it is characterized in that: comprise iraser [1] and lens [2], detected material is positioned on the focus point of infrared light through lens [2] formation of described iraser [1] emission, also include visible-light detector [6], described visible-light detector [6] is positioned on the catoptrical light path, and its output terminal is connected with A/D converter.
5. the pick-up unit of infrared up-conversion material as claimed in claim 4 is characterized in that: can be at the preceding narrow band pass filter [5] that is provided with of visible-light detector [6].
6. as the pick-up unit of claim 4 or 5 described infrared up-conversion materials, it is characterized in that: be provided with at least 2 group sniffers, every group of sniffer is made of narrow band pass filter, visible-light detector and A/D converter respectively, and the high permeability of its narrow band pass filter corresponds respectively to a plurality of visible light wave ranges that infrared up-conversion material sends.
7. the pick-up unit of infrared up-conversion material as claimed in claim 6, it is characterized in that: be provided with 3 groups of described sniffers, the detection wave band of described 3 groups of sniffers is respectively ruddiness, green glow, blue light.
8. as the pick-up unit of claim 4 or 7 described infrared up-conversion materials, it is characterized in that: bracing frame can also be made integrating sphere [4], described integrating sphere [4] is positioned between the surface of infrared laser [1] light path and infrared up-conversion material [3], and the narrow band pass filter in the described sniffer contacts with the integrating sphere surface.
9. the pick-up unit of an infrared up-conversion material, it is characterized in that: comprise infrared laser [1], arrowband reflecting piece [14], microscope [13] and visible-light detector [6], the infrared light that described infrared laser [1] sends is after arrowband reflecting piece [14] reflection, focus on up-conversion [3] surface by microscope [13], visible light reflected back microscope [13], and arrowband reflecting piece [14] is crossed in transmission, described visible-light detector [6] is positioned on the transmitted light path of arrowband reflecting piece [14], and the output terminal of visible-light detector [6] is connected with A/D converter.
10. the pick-up unit of infrared up-conversion material as claimed in claim 9, it is characterized in that: on the transmitted light path of described arrowband reflecting piece [14], be provided with the arrowband reflecting piece [15,16] of at least 2 different-wavebands, on its reflected light path, be respectively equipped with visible-light detector [10,6] and corresponding A/D converter.
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| CN 02138137 CN1219204C (en) | 2002-08-16 | 2002-08-16 | Method and instrument for detecting infrared ascending conversion material |
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| CN 02138137 CN1219204C (en) | 2002-08-16 | 2002-08-16 | Method and instrument for detecting infrared ascending conversion material |
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Cited By (18)
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| CN100387973C (en) * | 2003-10-22 | 2008-05-14 | 北京友邦联合高新技术有限公司 | Detection method and detector for multiple color ratio high efficiency false proof luminescent material capable of loading cipher |
| CN100507521C (en) * | 2004-04-23 | 2009-07-01 | 中国科学院上海光学精密机械研究所 | Up conversion luminous biosensor |
| CN101576602B (en) * | 2009-06-19 | 2010-12-29 | 南开大学 | Device used for detecting effect of up-conversion material in improving short circuit current density of solar cell |
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- 2002-08-16 CN CN 02138137 patent/CN1219204C/en not_active Expired - Lifetime
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| CN100507521C (en) * | 2004-04-23 | 2009-07-01 | 中国科学院上海光学精密机械研究所 | Up conversion luminous biosensor |
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