EP1567976A1 - Procede de codage d'informations et dispositif et procedes d'evaluation des informations codees - Google Patents

Procede de codage d'informations et dispositif et procedes d'evaluation des informations codees

Info

Publication number
EP1567976A1
EP1567976A1 EP03757706A EP03757706A EP1567976A1 EP 1567976 A1 EP1567976 A1 EP 1567976A1 EP 03757706 A EP03757706 A EP 03757706A EP 03757706 A EP03757706 A EP 03757706A EP 1567976 A1 EP1567976 A1 EP 1567976A1
Authority
EP
European Patent Office
Prior art keywords
fluorescent dyes
light
information
objects
detection chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03757706A
Other languages
German (de)
English (en)
Inventor
Guido Mennicken
Harry Vereecken
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Forschungszentrum Juelich GmbH
Original Assignee
Forschungszentrum Juelich GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Forschungszentrum Juelich GmbH filed Critical Forschungszentrum Juelich GmbH
Publication of EP1567976A1 publication Critical patent/EP1567976A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/06009—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking
    • G06K19/06046—Constructional details
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/12—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using a selected wavelength, e.g. to sense red marks and ignore blue marks

Definitions

  • the invention relates to a method for coding information and a device and method for evaluating the coded information.
  • a well-known method for providing and labeling objects with information and data is the creation and use of bar codes.
  • the bar code consists of a sequence of wide and narrow bars and wide and narrow gaps.
  • the sequence of these dashes and gaps represents in coded form the information that is usually shown alphanumerically.
  • the dashes and gaps are usually printed in a ratio (narrow: wide) of 1: 2 to 1: 3. This dimensioning makes it possible to optoelectronically generate reading signals which can be safely interpreted and which are practically independent of the quality of the bar codes usually applied by printing technology.
  • various purely numeric or alphanumeric codes are used.
  • These bar codes can then be decoded with appropriate contactless optoelectronic readers in order to encode the information on the objects in an encrypted and compressed form. maintain formations and identify the objects.
  • These readers consist essentially of a light source, such as. B. an LED or a laser, the light beam z. B. deflected over a rotating polygon mirror over the bar code.
  • the received beam which is intensity-modulated due to different reflections on the code lines and background, is evaluated and decoded by means of a detector. Reading pens mostly work with red or infrared (IR) light. The intensity of the reflected light is measured, which results from the dark and light stripes.
  • IR infrared
  • the displayable or encryptable information density of the bar codes known hitherto is limited, since the information can only be represented by the sequence of the "coding words" in the form of wide and narrow bars Encryption of further information on objects with additional bar codes can lead to confusion and errors when reading or decoding the information.
  • the object is achieved according to the invention with the features specified in the characterizing part of claim 1.
  • the problem is solved on the basis of the preamble of claim 13 according to the invention with the features specified in the characterizing part of claim 13.
  • the object is achieved according to the invention with the features specified in the characterizing part of claim 21.
  • the invention relates to a method according to claim 1 for coding information on objects by using fluorescent dyes.
  • the term “coding” is intended both to encode information in the form of bar codes which are combined with fluorescence dyes were created, or used in combination with previously known bar codes, include, as well as marking objects with fluorescent dyes.
  • a marking of objects with fluorescent dyes can be designed, for example, in the form of dots, lines, squares, triangles or other optically evaluable patterns and geometric shapes. However, it can also include, for example, coloring the entire object with fluorescent dyes.
  • the fluorescence signal of a dye or the combination of several dyes can then the information about the object such.
  • B. a certain material, price, functional information, specific name, the origin or delivery location of a package or piece of luggage can be assigned.
  • Fluorescent dyes emit fluorescent light when irradiated with light that is suitable to excite the fluorochrome molecules.
  • Many fluorochromes (collective name for fluorescent dyes) have aromatic ring structures or have double bonds.
  • Such molecules have delocalized electrons in so-called binding ⁇ orbitals. The electrons of these orbitals easily interact with the environment and reach a higher orbital ( ⁇ *) when an excitation photon is absorbed.
  • Electrons are usually present in binding orbitals with antiparallel spin - an arrangement that characterizes the so-called singlet states (S 0 , S x , S 2 ).
  • the absorption of an excitation photon (hv A ) lifts an electron from the ground state S 0 to one of the excited states Si or S 2 .
  • Rhodamines acridine orange, tetracyclines, porphyrins
  • a strong fluorescence of the colored objects or materials even in low concentrations. If the emitted radiation is in the visible or near the visible region of the spectrum, this is referred to as optical fluorescence, in contrast to the X-ray fluorescence emitted in an analogous manner after excitation with X-radiation.
  • Fluorescent organic substances are more common. Fluorescent dyes are used in spectroscopy to study and detect atoms and molecules. In addition to lamps, lasers are increasingly being used as a light source for excitation. Fluorescent dyes that fluoresce strongly in daylight and / or in UV light are used for the production of fluorescent stamps, for advertising prints using the screen printing process and also for coloring plastics and lacquers. These so-called fluorescent colors include, for example, acridines, xanthenes (e.g. fluorescein, rhodamine), thioxanthenes or pyrenes, uranines or quinines.
  • acridines e.g. fluorescein, rhodamine
  • thioxanthenes or pyrenes uranines or quinines.
  • the fluorescent dyes emit in a wide wavelength range from 300 to 1800 nm, it is possible, depending on the requirement, to use a desired fluorescent dye which, for. B. has no fluorescence in the visible wavelength range and thereby enables invisible coding of information that is invisible to the human eye. This can become important if optical coding would impair the use of the object, such as e.g. B. should be achieved in a viewing window or an inconspicuous marking for reasons of confidentiality.
  • the resulting fluorescence peaks or fluorescence signals of the individual fluorescent dyes should differ so clearly from one another that identification is possible, so that, for. B. a spectrometer can reliably identify the individual signals.
  • the fluorescence peaks of the different dyes should differ so clearly from one another that the baseline is reached again between the individual peaks in order to be able to achieve a clear evaluation.
  • the dyes can be applied to the object in the desired pattern or shape.
  • the fluorescent dyes are applied to the object in the form of bar codes.
  • the fluorescent dyes are also possible to use them in the printing process instead of or in addition to the previously used black printer color for the black and white bar codes. So it is z. B. possible to use the fluorescent dyes in printer cartridges commercially available printers with which the required barcode labels can be printed. Depending on requirements, it can be decided whether only fluorescent dyes or black printer ink for the results Position of the bar codes should be used.
  • the fluorescent dyes as an additional “coding word”, the information density is advantageously increased and can also be added to existing black and white bar codes without the risk of confusion.
  • fluorescent dyes are used which are not perceived by the human eye in daylight d. H. do not fluoresce in the spectral range from approx. 400 to 700 nm. These fluorescent dyes are particularly suitable for an inconspicuous coding of information on objects. This can play an important role in encoding information on e.g. B. play viewing windows or windshields, because the invisible bar codes do not affect the visibility of the viewing window, but at the same time the information such. B. can be evaluated in sorting processes.
  • the marking with fluorescent dyes can be included in the manufacturing process of objects.
  • the fluorescent dyes can also be applied when painting body parts. They can also be included in the polymerization or polycondensation process in the production of plastics.
  • the entire surface or the entire material of the object can also contain a fluorescent dye in order to, for example, B. in sorting processes an evaluation of the fluorescence Signals.
  • Objects can be tamper-proof and against mechanical forces, such as. B. Abrasion of the mark by using the object, protected with the desired information.
  • the method according to the invention is particularly suitable for marking objects which are to be fed to a recycling system, body parts which have to be sorted in the production process, unobtrusive marking of products, the design of which would be disturbed by the bar codes known hitherto, and forgery-proof marking of objects such as B. Customs seal.
  • the invention further relates to a device according to claim 12, for evaluating coded information on objects which have been encrypted using fluorescent dyes, comprising at least one light source and at least one detector, characterized in that the light source and detector are arranged in a read head or a detection chamber and the device includes means for controlling light emission.
  • a device according to claim 12 for evaluating coded information on objects which have been encrypted using fluorescent dyes, comprising at least one light source and at least one detector, characterized in that the light source and detector are arranged in a read head or a detection chamber and the device includes means for controlling light emission.
  • Light emission can be the emission spectrum of a light Source with a wavelength range of 200 to 1800 nm, for example, split into individual wavelengths, spectral lines or wavelength ranges and emitted in a targeted manner.
  • This can e.g. B. by using a spectral lamp whose emission spectrum is controlled by means of a prism or polygon mirror.
  • different light sources such as LED ⁇ s, UV lamps, infrared light lamps, or lasers that are switched on separately, the respective device-specific wavelength spectrum can be emitted and the light emission can also be controlled.
  • LED ⁇ s such as LED ⁇ s, UV lamps, infrared light lamps, or lasers that are switched on separately
  • the respective device-specific wavelength spectrum can be emitted and the light emission can also be controlled.
  • each fluorescent dye can be excited with a specific wavelength
  • the information assigned to the respective fluorescent dye can also be decrypted specifically by the light sources switched on at different times and correspondingly synchronized detectors.
  • the information encoded by means of different fluorescent dyes and the information encoded by the black and white bars can thus be read out specifically with the aid of the device according to the invention.
  • Objects such. B. in the recycling process or as part of a manufacturing process when transporting suitcases to the airport or in the mail sorting system must be supplied to the respective destination, contain information that must be evaluated in order to be able to sort the objects accordingly.
  • the objects With automatic table sorting systems, the objects are fed to the device, which reads the information, on a treadmill.
  • the detection chamber according to the invention comprises a space into which the objects to be evaluated are completely introduced, the information is evaluated and the object can then be transported to the appropriate destination. It is also possible to manually insert the object into the detection chamber.
  • 1 to 5 different light sources can be used within the detection chamber.
  • 20 to 30 light sources for example LEDs
  • the number of light sources is therefore dependent on the required wavelength spectrum, the lamp-specific emission spectrum and the need for differently high-energy radiation, so that the number of light sources cannot be limited to a specific number. So it is possible, for example, by means of a single light source whose emission spectrum is in the required wavelength ranges, e.g. B. with a prism, filtering, changing the voltage can be divided to perform a specific evaluation of the information.
  • detection chamber is to be understood as meaning an angular or spherical space into which the object for evaluating the information is introduced.
  • the inner surfaces are with at least a light source and at least one detector.
  • the detection chamber is shielded from extraneous light.
  • This configuration is particularly suitable for the evaluation of information which has been coded with fluorescent dyes, since indirect excitation with high-energy light, which is reflected by the surface of the shielded detection chamber, is sufficient to excite the fluorescent dyes on the object to fluoresce.
  • the fluorescence signals can be evaluated all around without having to align the object in the direct light beam of the light sources. Information that has been applied to different locations of the object can therefore be evaluated in an evaluation step without having to align the object in the direction of the light source and detector.
  • the detection chamber shielded from extraneous light further ensures that there are no radiation losses and no interference signals as a result of incoming extraneous light.
  • the measuring accuracy can be increased considerably.
  • One detector or several detectors can be used to detect the fluorescence signals. Spectrometers, photocells with special filters or CCD cameras can be used as detectors.
  • the shielded detection chamber reflects the fluorescence signals from the walls of the chamber and can thus be detected indirectly by a detector. Equipping the device with several de- However, tectors are also possible and can be advantageous if less sensitive detectors are used or a particularly rapid evaluation of the signals is required, in which a time delay is to be prevented by the indirect detection of the fluorescence signals.
  • the design of the device with the shielded detection chamber is particularly suitable for the evaluation of information on objects which have been marked with fluorescent dyes in the form of dots, patterns, lines and other optically evaluable geometric patterns or in which the entire object is coated with a specific fluorescent dye, e.g. B. was marked in the form of a paint job.
  • the arrangement of several light sources and detectors over the inner surface (top, bottom, side surfaces of the angular chamber or interior of the spherical chamber) of the detection chamber enables particularly fast and error-free evaluation of coded information that is in difficult-to-access positions on the Objects are applied, are carried out since a direct excitation with high-energy light or a direct evaluation of the fluorescence signals around the object is of particular advantage here.
  • the marked object is exposed to a flash of light of a defined wavelength within the detection chamber.
  • the detectors can then evaluate the emitted fluorescence signals from all sides. Depending on the detected signal, a sorting good can then be transported to the corresponding destination using a sorting unit.
  • the inner surfaces of the detection chamber are coated with a reflective color (for example Ti0 2 ) or made of reflective material (for example a mirror).
  • a reflective color for example Ti0 2
  • reflective material for example a mirror
  • the light sources and detectors can also be arranged in a read head.
  • the term reading head is to be understood as a functional unit consisting of light source and detector, with which the information encoded on the objects can be evaluated.
  • the reading head is brought into contact with the position of the object which contains the encrypted information, so that the light source excites the position marked with the fluorescent dye and / or the black and white bar codes for the fluorescence or signal of the bar codes and the Detector can evaluate the resulting fluorescence signal.
  • one or more light sources and detectors are arranged in the reading head.
  • the advantageous embodiment of the device with a reading head can enable the coded information to be evaluated in a simple manner and with a small space requirement with a high evaluation speed and high measuring accuracy.
  • the design of the device with a reading head is particularly suitable for the evaluation of coded information in the form of bar codes, which were created using fluorescent dyes, since the different reflections of the fluorescent code lines can be evaluated with high measurement accuracy and evaluation speed.
  • the reading head has light guides for the emitted light and light guides for the fluorescent light.
  • the emitted light can be directed from the light source directly to the bar code.
  • the signal can be forwarded to the detector by the bar code again via light guides. The measuring accuracy and measuring speed can thus be increased.
  • the reading head has a rubber sleeve which prevents the penetration of extraneous light and the scattering of the signal to be measured. This enables a higher measuring accuracy to be achieved.
  • the light pulses with the detector can be a direct specific evaluation of the signals.
  • the different fluorescent dyes can be excited to fluoresce at different times and specifically by the detector, such as. B. a spectrometer, photo cell with a special filter or CCD camera.
  • the light sources of the device according to the invention should have an emission spectrum between 200 and 1800 nm. This makes it possible to excite and evaluate a variety of bar codes with light. Information that is generated with black and white bar codes as well as with bar codes and markings that were created using fluorescent dyes can be evaluated on the basis of different absorption and emission properties. Spectral lamps, lasers, LED ⁇ s, infrared light lamps, photodiodes or UV lamps can be used as light sources.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)

Abstract

L'invention concerne un procédé permettant de coder des informations et un dispositif et des procédés pour évaluer les informations codées. Un procédé connu qui permet de caractériser et de munir des objets d'informations et de données consiste à établir et à utiliser un code barre. Comparativement aux procédés connus jusqu'à maintenant, le procédé selon l'invention permet désormais de munir des objets d'une densité d'enregistrement d'information plus différenciée et plus élevée. L'utilisation de colorants fluorescents permet, comparativement au langage de codage, jusqu'à présent disponible et composé de barres noires et blanches, d'ajouter un autre mot de codage et par conséquent d'augmenter la densité d'enregistrement d'information pouvant être représentée. Le dispositif selon l'invention permet de décrypter des informations cryptées et comprimées, qui présentent une densité d'enregistrement d'information plus élevée comparativement aux procédés de codage connus jusqu'à présent, du fait qu'un lecteur optoélectrique est muni de moyens pilotant l'émission de lumière.
EP03757706A 2002-11-11 2003-10-09 Procede de codage d'informations et dispositif et procedes d'evaluation des informations codees Withdrawn EP1567976A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10252628 2002-11-11
DE10252628A DE10252628A1 (de) 2002-11-11 2002-11-11 Verfahren zur Codierung von Informationen sowie Vorrichtung und Verfahren zur Auswertung der codierten Information
PCT/DE2003/003353 WO2004044832A1 (fr) 2002-11-11 2003-10-09 Procede de codage d'informations et dispositif et procedes d'evaluation des informations codees

Publications (1)

Publication Number Publication Date
EP1567976A1 true EP1567976A1 (fr) 2005-08-31

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ID=32115463

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03757706A Withdrawn EP1567976A1 (fr) 2002-11-11 2003-10-09 Procede de codage d'informations et dispositif et procedes d'evaluation des informations codees

Country Status (4)

Country Link
US (1) US20060163492A1 (fr)
EP (1) EP1567976A1 (fr)
DE (1) DE10252628A1 (fr)
WO (1) WO2004044832A1 (fr)

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US20130344297A1 (en) * 2012-06-25 2013-12-26 International Business Machines Corporation Identification of Material Composition
FR2992970B1 (fr) * 2012-07-09 2014-07-04 Commissariat Energie Atomique Utilisation de complexes de lanthanides pour le marquage optique de produits
US11962876B2 (en) 2014-01-31 2024-04-16 Digimarc Corporation Recycling methods and systems, and related plastic containers
US20190306385A1 (en) 2014-01-31 2019-10-03 Digimarc Corporation Concerning digital marking and reading of plastic items, useful in recycling
NL2014986B1 (en) * 2015-06-18 2017-01-23 Filigrade B V Waste separation method.
PL421008A1 (pl) * 2017-03-27 2018-10-08 Ergis Spółka Akcyjna Materiał powłokowy do znakowania tworzyw sztucznych, sposób znakowania tworzyw sztucznych, sposób identyfikacji znakowanych tworzyw sztucznych oraz ich zastosowanie do sortowania odpadów z tworzyw sztucznych
US11139154B2 (en) * 2019-02-04 2021-10-05 Shimadzu Corporation MALDI mass spectrometer and matrix observation device

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Also Published As

Publication number Publication date
DE10252628A1 (de) 2004-05-19
US20060163492A1 (en) 2006-07-27
WO2004044832A1 (fr) 2004-05-27

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