EP4000049A1 - Dispositif capteur de photoluminescence servant à vérifier une propriété de sécurité d'un objet et procédé de calibrage d'un dispositif capteur de photoluminescence - Google Patents

Dispositif capteur de photoluminescence servant à vérifier une propriété de sécurité d'un objet et procédé de calibrage d'un dispositif capteur de photoluminescence

Info

Publication number
EP4000049A1
EP4000049A1 EP20743639.5A EP20743639A EP4000049A1 EP 4000049 A1 EP4000049 A1 EP 4000049A1 EP 20743639 A EP20743639 A EP 20743639A EP 4000049 A1 EP4000049 A1 EP 4000049A1
Authority
EP
European Patent Office
Prior art keywords
radiation
electromagnetic radiation
generated
calibration
sensor device
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.)
Granted
Application number
EP20743639.5A
Other languages
German (de)
English (en)
Other versions
EP4000049B1 (fr
Inventor
Florian Peters
Piotr Szegvari
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.)
Bundesdruckerei GmbH
Original Assignee
Bundesdruckerei 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 Bundesdruckerei GmbH filed Critical Bundesdruckerei GmbH
Publication of EP4000049A1 publication Critical patent/EP4000049A1/fr
Application granted granted Critical
Publication of EP4000049B1 publication Critical patent/EP4000049B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/1205—Testing spectral properties

Definitions

  • Photoluminescence sensor device for verifying a security feature of an object and method for calibrating a photoluminescence sensor device
  • the invention relates to a photoluminescence sensor device for verifying a security feature of an object in a measuring range of the sensor device.
  • the invention also relates to a method for calibrating such a photoluminescence sensor device.
  • the object can be a security object, in particular a security document, for example an officially issued certificate, a chip card or
  • the object can be an object of value, in particular a document of value, such as a bank note or a share.
  • the object can be made of paper, for example.
  • At least one photoluminescent substance can, for. B. be integrated into the material of the object and / or applied to the material, for example, be printed. Pigments composed of at least one such substance or with at least one such substance can be used in particular.
  • the substance or substances are irradiated with electromagnetic radiation of suitable wavelengths matched to the excitation energy, so that atoms or molecules of the respective substance are excited to a higher energy level.
  • electromagnetic radiation characteristic of the substance is emitted, with the aid of which the authenticity of the object can be determined and thus the object can be verified.
  • EP 1 241 242 A2 discloses anti-Stokes phosphors for use in
  • Anti-Stokes fluorescent substances of this type belong to the group of photoluminescent substances, which can be excited to emit electromagnetic luminescent radiation via excitation with electromagnetic radiation.
  • Anti-Stokes phosphors absorb electromagnetic radiation of a wavelength, which is referred to as the excitation wavelength, and emit at least part of the luminescence radiation at at least one anti-Stokes wavelength which is shorter than the excitation wavelength.
  • EP 1 241 242 A2 indicates that the rise times and / or fall times of the time profile of the anti-Stokes luminescence radiation can be evaluated for automatic detection of the anti-Stokes luminescent substance.
  • the invention is not based on that
  • the photoluminescent substance or one of the photoluminescent substances of the security feature can be a Stokes fluorescent substance, which causes the emitted electromagnetic radiation to be shifted to greater wavelengths compared to the exciting electromagnetic radiation. Overall, it can be stimulating
  • electromagnetic radiation therefore lie in a first wavelength range and the emitted electromagnetic radiation, which can also be referred to as luminescence radiation, lie in a second wavelength range that differs from the first wavelength range.
  • the wavelength ranges are also different when they overlap and / or the maxima of the spectral
  • Radiation intensities are at different wavelengths. Different wavelength ranges do not necessarily require that the wavelength ranges adjoin one another or even have a wavelength spacing from one another. Such a wavelength spacing can, however, be achieved in particular when the exciting electromagnetic radiation is generated by a laser, for example a laser diode.
  • Luminescent substances are included.
  • Measurement signals from photoluminescence sensor devices can also from the
  • electromagnetic radiation that the object emits can also be generated by radiation from the environment of the sensor device. Furthermore, the object can reflect back radiation that was radiated onto the object by the sensor device in order to achieve the excited energy state. It therefore makes sense to measure the radiation originating from the environment separately, without measuring an object at the same time, and to correct the actual measurement signals from the measurement of an object later.
  • a measurement of a comparison object with the same reflection properties can be carried out in the wavelength range of the stimulating radiation as in the case of the object to be verified, so that an expected signal is available below the consideration of which objects can be verified later.
  • the stimulating radiation is in a different wavelength range than the luminescence radiation of the expected object, to filter out or suppress the stimulating radiation as completely as possible before the radiation hits the receiving device of the sensor device from which the
  • Measurement signal is generated.
  • this suppression of the stimulating radiation is associated with a corresponding effort, since the wavelengths of the stimulating radiation and the luminescent radiation are often close to one another and corresponding filters
  • a receiving device of the sensor device receives part of the electromagnetic radiation generated in at least a sub-range of the (first) wavelength range of the electromagnetic radiation generated.
  • the electromagnetic radiation received in this way is evaluated and a corresponding calibration result is generated.
  • the calibration result is taken into account when evaluating the luminescence radiation during measurement operation for the purpose of verifying an object.
  • Receiving device of the photoluminescence sensor device can radiate. However, the state should be reached as closely as possible, i.e. that of the
  • Radiation emanating from the measuring range and / or reflected radiation in the first wavelength range should be as small as possible compared to the radiation in the first wavelength range not emanating from the measuring range but received by the receiving device.
  • the radiation emanating from and / or reflected from the measurement area can be measured, for example by temporarily preventing this radiation from being detected by the sensor during the separate measurement.
  • an absorbent material can be introduced between the measurement area and the receiving device. This can be implemented, for example, by covering a window of the sensor device.
  • this part of the electromagnetic radiation generated by the receiving device can be radiation that remains within the sensor device without leaving it, and / or radiation that is reflected and / or deflected on its way to the measurement area, so that it does not reach the measuring range.
  • it is located between the sensor device and the
  • the wavelength range reaches the measuring range without significant weakening
  • Reflection or scattering Air in particular only leads to very little reflection or scattering.
  • the radiation deliberately partially reaching the receiving device in the first wavelength range thus consists in particular of radiation that remains within the sensor device without leaving it. If the sensor device has a window through which the generated radiation is radiated into the measurement area, then radiation that remains within the sensor device also includes radiation that is reflected back from the window and therefore not from the
  • the calibration operation can take place once or repeatedly, especially if it has been recognized that there is no photoluminescent substance in the measuring area.
  • the recognition can take place by a user and / or automatically.
  • the calibration operation can take place once or several times between two phases of the measuring operation, i.e. in each phase of the measuring operation there is an object to be verified in the measuring area.
  • the calibration mode can therefore only differ from the measurement mode in that that generated by the receiving device
  • Received signal which corresponds to the received radiation leads to a calibration result in the calibration mode and to a verification or non-verification of an object in the measurement area in the measurement mode, taking into account the
  • Calibration result or one of several calibration results can be obtained in each case in different phases of the calibration operation and, for example, the most recent calibration result or a calibration result derived from several phases of the calibration operation can be taken into account in the measurement operation in the evaluation.
  • objects to be verified repeatedly can be moved through the measuring range of the sensor device. If there is no object to be verified in the measurement area in a time interval, the calibration operation can be carried out. This makes it possible, in particular, to have a
  • the reception and evaluation of radiation in the first wavelength range of the exciting radiation both in calibration mode and in measurement mode have the advantage that the influence of radiation in the first wavelength range is recorded and taken into account in the evaluation in measurement mode. If means (for example a filter) for reducing the radiation intensity of the radiation in the first wavelength range are present, which influence the radiation received by the receiving device, and / or if the receiving device is for other reasons (e.g. the
  • Radiation sensitivity of the receiving sensors is designed to be less sensitive
  • the properties of the means and / or the receiving device can turn out differently depending on the specimen, for example due to production.
  • the radiation in the first wavelength range can therefore have a different influence on the received signal of the receiving device, depending on the specimen of the sensor device.
  • the calibration result can be determined for each specifically present sensor device and thus the influence of the radiation in the first wavelength range on the received signal of the
  • Receiving device are taken into account.
  • the sensor device is preferably designed such that the radiation in the first
  • Wavelength range that does not emanate from the measurement range or is not reflected has a smaller influence on the received signal generated by the receiving device than luminescence radiation in the second wavelength range if a security feature with expected photoluminescence properties is located in the measurement range of the sensor device. If, for example, a sensor element of the receiving device, such as a photocell, generates a signal that is not spectrally resolved, but which can be caused by radiation in an extended wavelength range, then the spectral
  • Sensitivity of the receiving device including any means such as filters that influence the radiation incident on the receiving device, preferably at least a factor of 10 and in particular at least a factor of 100 smaller in the first wavelength range than in the second wavelength range. This relates in particular to the respective maximum sensitivity in the first and the second
  • Wavelength range because the sensitivity can also be in the individual
  • Wavelength ranges depend on the wavelength.
  • the invention is not limited to receiving devices whose sensor element or sensor elements do not deliver wavelength-resolved signals. Rather, the receiving device can, for example, generate a wavelength-resolved signal by means of a plurality of spectrally differently sensitive sensor elements when radiation is incident on the receiving device.
  • the invention makes it possible to verify security features with photoluminescent substances in a precise manner and with little effort, even if the received signals of the receiving device are not spectrally resolved.
  • the electromagnetic incident on the receiving device can be any electromagnetic incident on the receiving device.
  • a filter device which filters the electromagnetic radiation incident on the filter device.
  • Radiation flux density distribution of the incident on the receiving device electromagnetic radiation have a lower proportion in the first wavelength range than the spectral radiation flux density distribution of the electromagnetic radiation incident on the filter device.
  • Wavelength ranges are determined, in particular over the first wavelength range and outside the first wavelength range, for example in the second
  • the sensor device can be a correspondingly arranged
  • Another advantage is that, as already indicated, one is repeated
  • Calibration result can be obtained in one phase of the calibration operation and thus a current calibration result can be obtained. This is based on the idea that the influence of the radiation in the first wavelength range can depend on at least one influencing factor, such as the temperature of the
  • Information about the stimulating electromagnetic radiation is taken into account in measuring operation. This is particularly possible when the received signal is the
  • Receiving device is a time-dependent variable and thus reproduces the time course of the radiation incident on the receiving device.
  • luminescence it is often the case that the luminescence radiation is generated with considerable intensity only a considerable time after the stimulating radiation has hit the photoluminescent substance.
  • the received signal will therefore initially correspond predominantly or even almost exclusively to the stimulating radiation. Only when the intensity of the luminescence radiation has risen in the further course of the measurement does the luminescence radiation predominantly determine the received signal.
  • this mainly means that the level of the sensor value or measured value is mainly caused by the respective radiation.
  • Received signal can be viewed over a time interval and evaluated, taking into account a time curve expected for the security feature, whether the object to be verified is genuine or forged.
  • the radiation flux density can repeatedly be zero, rise and fall back to zero.
  • the time course between the increase in the radiation flux density from the value zero and the decrease again to the value zero can be designed differently.
  • this time profile is repeatedly the same profile during the operation of a specific sensor device. The latter makes it possible, in particular during the calibration operation and during the measurement operation, with the same temporal progressions of the radiation flux density of the radiation generated over a time interval, corresponding reception signals
  • the time profile can be such that the radiation flux density, starting from the value zero, increases steadily to a maximum and then steadily decreases again to zero.
  • more complex time courses e.g. with two or more than two maxima of the radiation flux density between the first increase in the radiation flux density and the last decrease within the time interval, are also possible.
  • the electromagnetic radiation can therefore be generated by the radiation generating device in the measurement mode and in the calibration mode in such a way that the radiation flux density of the electromagnetic radiation generated by the radiation generating device has the same, non-constant time profile at least in one time interval.
  • the electromagnetic radiation can therefore be generated by the radiation generating device in the measurement mode and in the calibration mode in such a way that the radiation flux density of the electromagnetic radiation generated by the radiation generating device has the same, non-constant time profile at least in one time interval.
  • the control device can be designed to control the radiation generating device in such a way that the radiation flux density has the course described in one of the two preceding sentences.
  • radiation flux density has the advantage that the Calibration result can be reliably obtained.
  • the beginning of a time interval in which an evaluation of the received signal is to take place can be recognized from a rise in the received signal over time and / or when a signal value of a predetermined level is reached.
  • the signal value is not only in this embodiment, for example, an electrical voltage of a photocell or a voltage derived therefrom, e.g.
  • Calibration result is generated by evaluating the received signal or that a measuring operation takes place.
  • the change in the radiation flux density of the generated radiation during the evaluation of the received signal makes it possible to determine whether the received signal was generated exclusively from the generated radiation and possibly from undesired interference radiation, e.g. from the vicinity of the sensor device, or whether the received signal was generated in a time interval was also generated in a recognizable manner by luminescence radiation in the observed time interval.
  • the sensor device comprising:
  • a radiation generating device which is designed to be electromagnetic
  • electromagnetic radiation is suitable for bringing a photoluminescent substance into an excited energy state as a security feature or as part of a security feature of the object
  • a receiving device which is designed in a measuring mode of the
  • photoluminescent substance to receive electromagnetic radiation emitted in a second wavelength range that differs from the first wavelength range and to generate a corresponding received signal
  • control device which is designed to control the radiation generating device in the measuring mode and in a calibration mode in such a way that the electromagnetic radiation generated by the radiation generating device is at least a time interval has a time profile of the radiation flux density which is not constant in the time interval
  • the receiving device being configured to receive part of the electromagnetic radiation generated by the radiation generating device in the calibration mode in which there is no security feature in the measuring range of the sensor device and to generate a corresponding calibration signal
  • the evaluation device is configured to evaluate the calibration signal generated in the calibration mode, to generate a corresponding calibration result and the calibration result from the evaluation of the received signal
  • a method for calibrating a photoluminescence sensor device which is suitable for verifying a security feature of an object, comprising:
  • photoluminescent substance as a security feature or as part of a
  • Radiation generating device is generated that the generated electromagnetic
  • ok Radiation has a time profile of the radiation flux density in at least one time interval which is not constant in the time interval, and
  • the radiation generating device can be any suitable device for generating electromagnetic radiation in a wavelength range that is suitable for exciting photoluminescence.
  • a laser e.g. a laser diode or an arrangement of laser diodes, or a light emitting diode or
  • the radiation generating device can have at least one filter which generates radiation in at least one
  • Wavelength range weakens. As a result, the spectrum of the generated radiation can be changed before the radiation emerges from the radiation generating device.
  • the radiation that is generated and exiting from the radiation generating device can be irradiated to one part of the measurement area of the sensor device in any way and another part of it to be irradiated onto the receiving device without having previously reached the measurement area.
  • the two parts mentioned can be used immediately after generation and / or at any other point in the
  • the radiation path to the measuring area run in different directions.
  • the generated radiation can propagate in different directions within a solid angle.
  • the portion of the generated radiation that reaches the measurement area can spread within a first sub-area of the solid angle, and within another sub-area of the solid angle the portion of the generated radiation that reaches the receiving device without having previously reached the measuring area can spread.
  • the division means a division of the intensity or radiation flux density of the radiation into the two components, which spread from the location of the division on different radiation paths and / or in different solid angle areas.
  • a division can also take place several times so that the intensity of the radiation generated running on the radiation path to the measuring area is weakened several times.
  • an optical device of the sensor device such as a mirror or a lens, can be used for the division.
  • the electromagnetic radiation generated by the radiation generating device can be transmitted in this way by at least one optical radiation both in the measurement mode and in the calibration mode
  • Calibration mode receives and according to which the receiving device generates the calibration signal.
  • the optical device or one of the optical devices can be a partially permeable reflector which, with respect to the radiation flux density, has a greater proportion of that generated by the radiation generating device
  • electromagnetic radiation is reflected or allowed to pass in a different, second direction, in which electromagnetic radiation reaches the receiving device without exiting the sensor device.
  • the portion that is allowed to pass or is reflected by the reflector in the first direction can be more than 70%, for example more than 80 percent and preferably more than 85 percent of the radiation flux density impinging on the reflector.
  • the optical device or one of the optical devices may be any of the optical devices.
  • electromagnetic radiation is radiated into the measurement area of the sensor device, with a portion of the generated electromagnetic radiation being reflected by the exit window in the measurement mode and in the calibration mode and at least partially reaching the receiving device.
  • the receiving device can be any device that is used to receive electromagnetic radiation in both the first and the second
  • Wavelength range is suitable, d. H. the received signal can also be generated by radiation in the first wavelength range. If the first wavelength range and the second wavelength range do not overlap, the receiving device is also sensitive to radiation in the separate first wavelength range. If the first wavelength range and the second wavelength range overlap one another, the receiving device is in a partial area of the overlap area, in the entire overlap area and / or at least in a partial area of the first
  • Wavelength range that is not in the overlap range is sensitive to
  • the receiving device can have a photocell or an arrangement of photocells.
  • the receiving device can have one or more sensor elements, each sensor element being designed to generate a sensor signal corresponding in particular to the intensity or the spectral intensity of the incident radiation when electromagnetic radiation strikes in a spectral sensitivity range of the sensor element. In the case of a plurality of sensor elements, they can all generate a spatially resolved sensor signal.
  • the sensor element and in particular each of the sensor elements is coupled to a signal amplifier so that the
  • the sensor signal or in the case of at least one signal amplifier, the amplified one
  • Sensor signal form the received signal of the receiving device, which can also be referred to as a measurement signal.
  • the received signal can also be a spatially resolved received signal.
  • a spatially resolved received signal makes it possible in particular to display the object to be verified below
  • a spatially resolved received signal it is preferred to generate a spatially resolved received signal not only in measurement mode but also in calibration mode, with the sensor signals of all sensor elements in calibration mode preferably corresponding completely or predominantly to the radiation generated by the radiation generating device in the first wavelength range that to reach the measuring range on which the receiving device was radiated.
  • Calibration mode provides a calibration result which, as with a non-spatially resolved received signal, corresponds to the generated radiation incident on the receiving device in the first wavelength range.
  • the calibration result can therefore be used for correction in the spatially resolved case and also in the non-spatially resolved case
  • Measurement mode are used and / or contains information about the measurement signal to be expected in measurement mode in the presence of an expected security feature.
  • the evaluation device is a device that is in
  • Evaluation device designed to use the calibration result when evaluating the received signal from the measuring operation.
  • Evaluation device have separate units, for example one unit the Evaluates the calibration signal and generates the calibration result and another unit, to which the calibration result is made available, evaluates the received signal using the calibration result in the measuring mode.
  • the two units are connected to one another, for example, directly via a signal connection and / or indirectly, for example via a memory for storing the calibration result, so that the other unit can receive the calibration result.
  • the same unit of the evaluation device generates the calibration result both in the calibration mode and in the measurement mode when evaluating the
  • Received signal uses the calibration result.
  • the evaluation device can be configured to form a corrected received signal from the received signal in the measurement mode, taking into account the calibration result
  • the matched filter also known as optimal filter in German
  • the matched filter can be used to check whether the received signal or the corrected received signal shows that the object is expected to be verified.
  • a luminescent reference object can in particular be measured with the sensor device or another sensor device, i. H. a measurement signal is recorded that corresponds to the at least one
  • Reference object can be caused by radiation in the first wavelength range of the exciting radiation. It is preferred that a calibration operation is also carried out in connection with the measurement of this reference object, a corresponding calibration signal is generated and this calibration signal is used in the evaluation of the measurement signal of the reference object.
  • This calibration operation can be a different calibration operation than the verification of an object to be verified.
  • the different conditions and optionally different properties of different sensor devices can be taken into account. For example, a first sensor device is used for measuring the reference object and a second sensor device is used for verifying an object to be verified. These two sensor devices are generally different Properties relating to the influence of the radiation generated by it in the first wavelength range, which affects the measurement signal without the
  • Sensor device generated radiation is generated in different first wavelength ranges.
  • a reference object it is not absolutely necessary for a reference object to be measured. Rather, it can alternatively or additionally, for example, be calculated which measurement signal is expected for an object to be verified.
  • the evaluation device can carry out the evaluation in an analogue and / or digital manner.
  • the received signal is an analog signal
  • Evaluation device receive the analog signal, convert it into a digital signal and then evaluate the digital signal.
  • the digital received signal can be a data stream if the
  • Received signal information is received continuously, or it is a data record if the time-resolved received signal is present as a digital data volume for at least a period or a time interval.
  • the calibration signal i.e. the received signal in
  • Calibration mode as a time-resolved analog signal, is digitized and forms a data set that describes the temporal course of the calibration signal over a time interval and in particular describes the temporal course of the intensity or the radiation flux density of the received radiation received by the receiving device.
  • the time interval can in particular be a time interval in which an increase in the measured value or sensor value (e.g. an electrical voltage) from zero or from an offset and / or background radiation value takes place in accordance with the time profile of the generated electromagnetic radiation and the profile returns to the Value zero or decreases to the offset value and / or background radiation value.
  • the background radiation is that radiation which is received by the receiving device or the sensor element even when the photoluminescence sensor device does not generate any radiation.
  • the background or ambient radiation can fluctuate over time.
  • the offset value corresponds to any value of the receiving device or of the respective sensor element, which is in particular not equal to zero and is generated when no radiation is incident on the receiving device. Therefore, the above-mentioned increase in Received signal also assume a value that is a sum of the value of the background radiation and the offset.
  • the generation of electromagnetic radiation in the first wavelength range is controlled by the radiation generating device in such a way that the generated radiation has a time profile in at least one time interval
  • the photoluminescence sensor device has a correspondingly designed one
  • Control device on.
  • the control device can be designed to control the time profile of the electrical power which the radiation generating device at least partially converts into radiant energy.
  • the control device can be designed to control the time profile of the electrical power which the radiation generating device at least partially converts into radiant energy.
  • Photoluminescence sensor device or the method can be designed such that the radiation received in calibration mode by the receiving device in the first wavelength range runs partially on the same radiation path as in the
  • the radiation in the first wavelength range can partially or completely run on a different path than the luminescence radiation in the measuring mode from its entry into the sensor device to its impact on the receiving device.
  • Receiving device involved are also taken into account.
  • the sensor device has an exit window (for example the optical device mentioned above as the exit window) through which the generated radiation in the first wavelength range is emitted in the direction of the measurement range.
  • an exit window for example the optical device mentioned above as the exit window
  • part of the generated radiation is reflected in such a way that it reaches the receiving device on the same radiation path on which the luminescent radiation runs in the measurement mode and also reaches the receiving device and is detected by it. Therefore, the radiation generating device, the exit window, the receiving device and optionally further devices of the sensor device influencing the radiation path of the radiation in the first wavelength range and the luminescence radiation are arranged in such a way that the said radiation paths from the exit window to the receiving device are at least partially the same.
  • the reflector can be larger Reflect portion of the generated electromagnetic radiation, in particular in a first direction in which the reflected radiation reaches the measuring range.
  • a smaller proportion of the generated radiation can be let through by the reflector and optionally, after at least one further reflection at a device of the sensor device, reach the receiving device and be detected by it, ie by the
  • Received signal can be detected.
  • Radiation generating device, the reflector, optionally the at least one further reflecting device and the receiving device are arranged accordingly.
  • the portion of the generated electromagnetic radiation that does not reach the measurement area and impinges on the receiving device and is detected by it can partially run on the same radiation path as that in the
  • Luminescence radiation entering the sensor device in the measurement mode and partially on a different radiation path reach the receiving device. If one radiation path is referred to here, this can be understood to mean several radiation paths for which this applies.
  • the luminescence radiation will generally propagate on different radiation paths, e.g. within a certain solid angle range, starting from an entry window and reach the receiving device.
  • the generated radiation reflected from the exit window can also run along at least part of these radiation paths. In particular, that part of the generated radiation in the first wavelength range that is on the same radiation path as
  • Luminescence radiation runs with regard to its contribution to the calibration signal and in particular with regard to its radiation power, are in the same order of magnitude as the part of the generated radiation in the first wavelength range, which runs on at least partially a different radiation path than the luminescence radiation from the entry into the sensor device to the receiving device. To put it more concretely, this part does not run completely on a radiation path that the luminescence radiation in the
  • Measurement operation takes from entry into the sensor device to the receiving device.
  • the two mentioned parts of the generated radiation in the first wavelength range in particular contribute in the same order of magnitude to the calibration signal and therefore also to the received signal during measurement operation.
  • “The same order of magnitude” is understood to mean that neither of the two parts is larger than the other part by more than a factor of 10.
  • the two parts can be of the same size. However, this depends on what properties are involved in the transmission of the radiation generated by the
  • Radiation generating device for receiving device participating devices of the sensor device in a specific example of the sensor device. Manufacturing tolerances of the devices involved can lead to concrete specimens causing parts of the radiation of different sizes in the first wavelength range. In all these cases, assuming the same conditions in calibration mode as in measurement mode, the calibration result makes it possible to take into account the influence of the generated radiation on the sensor signal in measurement mode. Even with different conditions in the calibration mode and in the measuring mode, the calibration result from the calibration mode can be taken into account in the measuring mode. In particular, the conditions, such as the temperatures and pressures mentioned above, as well as age and / or degree of wear, can also be taken into account. For example, the calibration result can be determined repeatedly under different conditions and the conditions can also be recorded if measurable quantities such as temperature and pressure are involved. From this, a valid one for the respective conditions of the measuring operation can be obtained
  • Calibration result can be determined, e.g. from a large number of stored
  • the optical properties of the participating devices of the sensor device are taken into account by the calibration result.
  • FIG. 1 schematically shows an arrangement with an optics module of a sensor device and a transport device by which an object to be verified can be transported past the optics module
  • FIG. 2 schematically shows a view of the optical module shown in FIG. 1, specifically based on FIG. 1 from above,
  • FIG. 3 schematically shows a view of the optics module shown in FIG. 1, specifically from the left in relation to FIG.
  • FIG. 4 schematically shows an arrangement as in FIG. 1, with an additional
  • Radiation generating device and a receiving device are shown and where the radiation paths of radiation are shown schematically when a measurement signal is generated,
  • FIG. 5 shows the arrangement from FIG. 4, but with radiation paths of radiation
  • FIG. 6 shows a flow chart to explain an exemplary embodiment of a method for calibrating a photoluminescence sensor device
  • FIG. 1 The arrangement shown in FIG. 1 has an optics module 18 which is part of a photoluminescence sensor device, which is not completely shown in FIG. 1. Furthermore, FIG. 1 shows an object 22 to be verified with a security feature 23
  • the security feature 23 is arranged on a surface of the object 22.
  • the security feature can, however, alternatively or additionally be integrated into the object 22.
  • the security feature 23 has at least one substance which emits luminescence radiation when excited by suitable radiation.
  • Luminescence radiation has a different wavelength than the stimulating radiation. It is often the case that the luminescence radiation is essentially monochromatic radiation, while the exciting radiation can lie in a wavelength range and has the minimum excitation energy per photon that is necessary for exciting the
  • the object 22 is located on a slide 21.
  • a slide 21 can be in another
  • a transport device 24 is shown schematically in FIG. 1, which transports the object 22 past an exit window 11 of the optics module 18, while the object 22 is measured by the sensor device.
  • a transport device can also be omitted.
  • the object can be examined while it is not moving relative to the sensor device. Before and / or after a calibration operation can take place in which there is no luminescent substance in the
  • Measuring range of the sensor device is located. In the one shown in FIG.
  • the measuring range of the sensor device is where the Object 22 and also the security feature 23 are located.
  • the measurement area can be understood as a spatial area which, as seen from the exit window 11, is located at a solid angle below the exit window 11. If below, above, right and left are mentioned here, this relates to the illustration in FIG. 1.
  • the object and sensor device can be arranged differently relative to one another.
  • the optics module 18 has a housing 7 with a housing interior 10 that allows electromagnetic radiation to pass through the housing interior 10.
  • the optics module 18 has a plurality of entry openings 12.
  • the optics module 18 in this special exemplary embodiment has a total of ten entry openings 12 arranged in a row next to one another.
  • each of these entry openings 12 can be assigned a radiation source 13, as shown as a component in FIGS. 4 and 5 a radiation generating device 17 is shown.
  • the radiation source 13 which is, for example, a light-emitting diode or has a plurality of light-emitting diodes, occurs, as is shown schematically by an arrow in FIG.
  • Radiation source 13 generated radiation through the inlet opening 12 into the
  • Housing interior 10 a Housing interior 10 a.
  • an optics module 18 shown in FIG. 1 has an entry optics 5 at the entry opening 12, which can be, for example, an optical lens or an arrangement of lenses in order to focus the entering electromagnetic radiation and / or to disperse.
  • a filter (not shown) can be located at the entrance opening 12, which filters the radiation entering the housing interior 10. E.g. this way a
  • Part of the radiation that is close to the wavelength of the luminescence radiation is weakened and thus filtered out.
  • a partially transparent reflector 3 which can also be referred to as a partially transparent mirror. He is in that
  • Embodiment arranged at an angle of 45 ° to the main axis of the inlet opening 12.
  • the radiation entering through the inlet opening 12 into the housing interior 10 with a proportion of the total intensity of the radiation, is passed down through the exit window 11, which is located at the bottom of the housing 7, deflected into the measuring range.
  • the proportion of this radiation that is not reflected downward by the reflector 3 will be discussed with reference to FIG.
  • the housing interior 10 has a recess 2, which is shown in the illustration of FIG.
  • FIG. 5 shows schematically, the radiation running through the recess 2 exits the optics module 18 upwards and strikes at least one sensor element 15 of the receiving device 19, which is located above the optics module 18.
  • the filter arrangement 4 can reduce, i.e. weaken, the spectral component of the radiation generated by the radiation generating device 17 in the first wavelength range.
  • the filter arrangement can be designed as a bandpass filter, which predominantly allows radiation in the second wavelength range of the luminescent radiation to pass. As described above, however, it is advantageous to also use a proportion of the
  • An arrow with the letter B indicates the direction of movement in which the object carrier 21 moved by the transport device 24 can move with the object 22 when, as shown in FIG. 3, the optics module 18 has a row of entry openings 12 arranged next to one another.
  • the row of inlet openings 12 lies one behind the other in a direction which extends perpendicular to the plane of the figure in FIG. 1.
  • the exit window 11 is designed so large in the direction perpendicular to the plane of the figure in FIG. 1 that the majority of those entering through the plurality of entry openings 12
  • the length of the exit window 11 in the transport direction (the horizontal direction in FIG. 1) is considerably shorter in the exemplary embodiment. In relation to FIG. 1, the measuring area therefore has a small length in the transport direction with a very much greater width in the direction perpendicular to the plane of the figure.
  • the receiving device 19 has a plurality of sensor elements 15, each sensor element 15 being assigned to a sensor opening 16, i.e. receiving and detecting the measuring radiation emerging from the housing 7 through the sensor opening 16.
  • the plurality of sensor openings 16 lie in a row one behind the other along the perpendicular to the plane of the figure in FIG. 1.
  • Inlet openings 12 from the number of sensor openings 16. However, the length of the row of inlet openings 12 is approximately equal to the length of the row of sensor openings 16, "Length" in this case is to be measured in the direction perpendicular to the plane of the figure in FIG. 1. Due to the different number of inlet openings 12 and
  • each sensor element 15 detects radiation that was generated by a plurality of radiation sources 13 or was generated by excitation by means of the radiation of a plurality of radiation sources 13 on the basis of luminescence.
  • the inlet openings 12 and the sensor openings 16 in Figures 2 and 3 are shown circular.
  • the housing interior 10 can therefore be cylindrical in the area of these openings.
  • the invention is not limited to this form. Rather, the area of the inlet opening and / or the area of the sensor opening can be shaped in any way.
  • Sensor elements is wholly or partially continuous opening area.
  • separate openings have the advantage that the radiation bundles generated by the individual radiation sources can in any case be distinguished from at least some of the other radiation bundles.
  • a single sensor element only detects radiation beams from three radiation sources or the resulting radiation sources
  • Luminescent radiation There is thus a local resolution when the radiation is detected by the sensor elements.
  • Sensor elements is present, but a plurality of rows, so that a two-dimensional spatial resolution takes place.
  • Receiving device 19 can use the sensor device, for example, as one in a single
  • Housing integrated device can be realized. It is also possible for either the radiation generating device or the receiving device to be designed as a separate module. In addition, it is possible that the radiation generating device and / or the receiving device are not permanently connected to the optics module, but rather are, for example, arranged at a distance from one another and there is no material bridge directly between the various modules. However, this has the disadvantage that the radiation path from the radiation generating device to the optics module and the radiation path from the optics module to the receiving device can change, for example due to mechanical vibrations, impacts caused by a user or due to thermal expansion or contraction. It is therefore preferred that, in the case of separate modules, the radiation generating device, the receiving device and the optics module are permanently connected to one another. In the in Fig.
  • first alignment pins 8 and second alignment pins 9 are provided for the purpose of a stable connection of the modules.
  • the first alignment pins 8 extend upward from the housing 7 of the optics module 18 in the illustration of FIG. 1. This can also be seen from FIGS. 2 and 3. For example, in the view of Figure 3, two of the first alignment pins 8 extend upward. From Fig. 1 only a first alignment pin 8 and a second alignment pin 9 can be seen.
  • the radiation generating device 17 accordingly (not shown)
  • Receiving device 19 corresponding recordings for receiving the first
  • FIGS. 4 and 5 schematically show an assembled state in which the alignment pins 8, 9 (not shown in FIGS. 4 and 5) are received in the corresponding receptacles. The small distance between the alignment pins 8, 9 (not shown in FIGS. 4 and 5) are received in the corresponding receptacles. The small distance between the alignment pins 8, 9 (not shown in FIGS. 4 and 5) are received in the corresponding receptacles. The small distance between the alignment pins 8, 9 (not shown in FIGS. 4 and 5) are received in the corresponding receptacles. The small distance between the alignment pins 8, 9 (not shown in FIGS. 4 and 5) are received in the corresponding receptacles. The small distance between the alignment pins 8, 9 (not shown in FIGS. 4 and 5) are received in the corresponding receptacles. The small distance between the alignment pins 8, 9 (not shown in FIGS. 4 and 5) are received in the corresponding receptacles. The small distance between the alignment
  • the radiation generating device 17 and the optics module 18 and the small distance between the receiving device 19 and the optics module 18 in FIGS. 4 and 5 are only shown in order to make the various modules recognizable as separate modules.
  • the surfaces of the various modules are preferably in contact with one another in pairs. This also applies to the area shown at the top left in FIGS. 4 and 5, in which the radiation generating device 17 and the receiving device 19 are adjacent to one another.
  • the complete sensor device 1 is formed by the three modules.
  • the three modules can be accommodated in a common housing of the device.
  • the radiation generating device 17, as shown in FIG. 4, has a
  • Control device 25 for controlling the radiation generating device.
  • control device 25 is connected to the radiation source 13.
  • control device 25 adjusts the time profile of the electric current through the radiation source 13, which is designed as a light-emitting diode, in the desired manner, so that the radiation source 13 effects a corresponding time profile of the intensity of the emitted electromagnetic radiation.
  • the receiving device 19 has an evaluation device 26 which receives, records and evaluates the measurement signals generated by the individual sensor elements 15.
  • the radiation generating device 17 and the receiving device 19 are designed as separate modules or devices from the optics module 18, the heat generated during the operation of the control device 25 and the evaluation device 26 can be used are largely discharged to the outside without significantly heating the optics module 18.
  • the optical properties of the optics module can thus be kept largely independent of the operating temperature of the radiation generating device 17 and the receiving device 19.
  • Wavelength range enters the optics module 18 and strikes the reflector 3.
  • the radiation source 13 radiates a diverging beam of radiation into the optics module 18, which can optionally be focused by the entry optics 5.
  • the focal point is preferably not on the surface of the reflector, but in front of or behind it, so that a locally distributed radiation beam hits the reflector 3.
  • the area on the surface of the reflector 3 that is irradiated by the radiation source 13 can be an elliptical area that results from an oblique cut through the radiation cone, which is made from the combination of radiation source 13 and entrance optics 5 results.
  • Luminescence radiation is shown schematically in FIG. 4 by a long arrow pointing from bottom to top.
  • the radiation enters the optics module 18 through the exit window 11, passes through the recess 2 and, after leaving the optics module 18, reaches the at least one sensor element 15 of the receiving device 19. There the radiation is detected and a corresponding one is generated Measurement signal generated.
  • FIG. 1 shows, there is in particular a filter arrangement in the recess 2 so that the
  • Radiation spectrum which passes through the reflector 3 is changed by the filter arrangement or by the filter.
  • the at least one sensor element 15 therefore receives both
  • the intensity of the total radiation impinging on the sensor element 15 in the presence of a luminescent substance in the measurement area is significantly greater than in the situation when only radiation is reflected back to the optics module in the measurement area, e.g. at least a factor of 10.
  • the optical properties can be specific examples of the entrance optics 5, the reflector 3, the filter arrangement, for example with the first filter 4a and the second filter 4b as well as the
  • Receiving optics 6 differ significantly from other copies.
  • the evaluation of luminescent radiation of a security feature can be improved. It is conceivable that, for this improvement, a calibration operation also takes place in such a way that a radiation-reflecting material is located in the measurement area.
  • a calibration mode is therefore preferred if there is no material that is significantly reflective in the measurement area.
  • the measurement signal that results from a luminescence excitation with a temporal course of non-constant radiation intensity can be normalized with regard to its amplitude and / or in particular the effect of a delay in the emission of the luminescence radiation after the excitation of the luminescence can also be taken into account. It is therefore advantageous if the signal curve over time of the measurement signal also occurs over the time interval of the impingement of luminescence-stimulating radiation on the
  • Security feature is considered. It is therefore generally preferred that, after luminescence-stimulating radiation has impinged on the security feature
  • Time interval begins in which no luminescence-stimulating radiation from the
  • Sensor device is radiated into the measuring area and thus onto the security feature.
  • An exemplary embodiment will also be discussed with reference to FIGS. 7 and 8.
  • Fig. 5 it is shown schematically that radiation generated by the radiation generating device 17 in the first wavelength range is not only radiated into the measurement range, but is also reflected and deflected inside the device and thus strikes the at least one sensor element 15. Even if in FIG. 5 as well as in FIG Object 22 and an object carrier 21 are shown (which can be moved relative to the sensor device 1 as indicated by two arrows pointing to the right while the object is being measured), the process now described with reference to FIG. 5 also occurs when in the measuring range no specimen or slide is located.
  • the radiation generated by the radiation source 13 in the first wavelength range hits the reflector 3, as has already been described with reference to FIG. 4, and is for the most part reflected in the direction of the exit window 11.
  • a portion of the radiation impinging on the exit window 11 is reflected by the exit window 11 back in the direction of the reflector 3 and, in turn, passes through the reflector 3, passes through the recess 2 and strikes the receiving device 19, so that it is detected by the sensor element 15 is detected.
  • Another portion of the radiation radiated from the radiation source 13 onto the reflector 3 passes through it and is, for example, both at
  • Reception device 19 impinge and are detected by the at least one sensor element 15, so that a corresponding measurement signal arises or a corresponding portion of the measurement signal is caused.
  • a calibration operation without an object is carried out in the measuring range of the sensor device 1 immediately before or after a measuring operation, it can be assumed that the
  • the measurement signal recorded in the calibration mode in particular the measured radiation intensity as a function of time or a result thereof
  • Signal derived from evaluation can be used as a calibration result for evaluating the measurement signal during measurement operation.
  • FIGS. 1 to 5 An exemplary embodiment of a sensor device has been described with reference to FIGS. 1 to 5, in which an exit window is present, through which the radiation generated by the sensor device exits into the measurement area of the sensor device. Radiation again enters the sensor device through the same exit window and causes the measurement signal.
  • the invention is not restricted to such an exit window. In principle, there could also be no exit window, even if in this case the interior of the sensor device and in particular the optics module were not protected from the ingress of dirt. However, there does not have to be an exit window through which the radiation exits into the measurement area and through which the measurement radiation re-enters the sensor device. E.g. there can be an exit window and a separate entry window.
  • the measurement radiation enters the device. Nevertheless, there can be the effect that radiation is reflected at the exit window and also causes the measurement signal. Furthermore, a reflection or deflection of the measurement radiation generated by the sensor device can take place at other devices of the sensor device, which also contributes to the measurement signal.
  • a calibration operation of the sensor device e.g., the sensor device shown in Figs. 1 to 5 or another sensor device, is carried out.
  • this step e.g. the recording of the time course of the
  • Measurement signal of the receiving device or, in the case of several sensor elements, of their measurement signals started. This can optionally be triggered e.g. by the fact that an imminent entry of an object to be verified into the measuring range of the
  • Sensor device generates and emits electromagnetic radiation in the first wavelength range, this radiation being suitable for exciting a luminescent substance in the measuring range of the sensor device, so that it emits luminescence radiation.
  • the calibration mode is preferably only then carried out and / or continued if there is no object in the measurement area.
  • steps S1 and S2 can be performed simultaneously, for example. It is also possible that step S1 is dispensed with and permanently without terminating the
  • step S3 which follows step S2, radiation is received and detected by the receiving device, so that a measurement signal or, in the case of a plurality of sensor elements, a plurality of
  • Measurement signals is generated.
  • the at least one measurement signal is as
  • Sensitivity range of the receiving device recorded.
  • the measurement and recording preferably take place at a sampling frequency which is at least a factor of 10 and preferably, according to the known sampling theorem, greater than the frequency of the generation of the excitation signal by the radiation generating device. It is particularly preferred that the sampling is carried out at such a high frequency that the measurement signal can be reliably evaluated with an expected signal in accordance with matched filter technology. Steps S2 and S3 relate to the beginning of the
  • Wavelength range and the measurement signal is continuously generated and recorded as a function of time.
  • a calibration signal KS is generated in the following step S4, e.g. by identifying a partial progression of the measurement signal over time.
  • the calibration signal KS is, for example, a signal in a time segment of the time period shown in FIG. In this exemplary embodiment, it includes a
  • step S5 the calibration signal KS from step S4 is stored.
  • the calibration mode is ended in the subsequent step S6.
  • a plurality of the calibration signals KS can be selected
  • Calibration result KER can be generated, e.g. by averaging the Calibration signals.
  • a time profile of the measured radiation intensity is generated during the calibration operation, which corresponds to the repeated rise and fall of the measured radiation intensity on average.
  • Averaging can reduce the influence of random interference signals.
  • the calibration result KER can be generated on the basis of a minimum number of calibration signals KS.
  • the calibration result KER which can also correspond to a single calibration signal, even if this is not preferred, is made available to steps S12 and / or S13 of the method to be carried out later.
  • the Sensor device is introduced and / or it is detected that an object has entered the measurement area.
  • the measuring operation is started, in particular by recording corresponding measuring signals.
  • the described time curve of the stimulating electromagnetic radiation can occur continuously, for example, without interruption between the calibration operation and the measurement operation, so that the intensity of the radiation in the first wavelength range increases and decreases again and afterwards no radiation is generated in a rest time interval. If it is detected that an object is entering or has entered the measurement area, the recording of the time profile of the measurement signal of the sensor device can be continued without interruption. B. the latest end of the
  • the detection can also take place solely by determining from the continuously recorded measurement signal when it has changed significantly in such a way that an object has presumably entered the measurement area.
  • a first matched filter can be used for this purpose. If the application of the first matched filter shows that the
  • Calibration result KER can be used.
  • a second matched filter can be used from this point in time to check whether a signal expected for the security feature to be verified is contained in the measurement signal.
  • step S9 following step S8 (in particular continued) electromagnetic radiation is carried out in the first
  • Wavelength range generated and irradiated onto the measuring range are:
  • Step S10 is the corresponding radiation from the measurement area, which is can act reflected radiation and can in particular also act to luminescence radiation, receive and contribute to the in particular continuously recorded measurement signal.
  • a received signal ES is generated.
  • electromagnetic radiation can be generated continuously in the first wavelength range, in particular periodically in the same way, the measurement signal continuously recorded and e.g.
  • a time course of the measurement signal in a time interval can be interpreted as a received signal ES, with the intensity of the received and measured radiation rising to a local maximum and falling again in this time interval.
  • the time interval of the measurement signal can e.g. end when the intensity increases again.
  • the repeated course of the intensity of the measurement signal with several increases to a local maximum and a subsequent decrease to a local minimum can also be interpreted as the measurement signal.
  • a time profile that repeats itself is well suited as a measurement signal, with the level of the local maxima and local minima being the same or only deviating from one another by a predetermined amount. This means that the local maxima all lie within the corresponding predetermined intensity range and the local minima also lie within the predetermined intensity range.
  • the received signal ES obtained in this way can now be evaluated, for example, by using the above-mentioned second matched filter.
  • the second matched filter can thus compare a measurement signal expected for the security feature with the actual measurement signal, taking into account the calibration result KER. It is basically possible to form the expected measurement signal in such a way that it contains or does not contain the contribution of the electromagnetic radiation generated by the sensor device that does not reach the measurement range. Accordingly, either the calibration signal is calculated from the generated measurement signal, e.g. subtracted, or the measurement signal is compared with the expected signal, which was also generated using the
  • Calibration result KER was generated. For example, it can be used to form the expected signal a signal to that expected only on the basis of luminescence radiation
  • Calibration result KER can be added.
  • the signal expected only for luminescence radiation can be calculated and / or obtained through a corresponding measurement of a reference object through measurement and evaluation.
  • a calibration result can in turn be taken into account, which can be obtained in a corresponding manner as already described. In this way, it can be taken into account in particular that different conditions prevail when measuring the reference object and, for example, a different sensor device is used than when measuring the object to be verified.
  • step S12 for example, the corrected received signal ESK can be formed and output.
  • step S13 which can already be carried out beforehand and / or simultaneously with step S12 and / or thereafter, the expected received signal ESE can be formed and output.
  • the flowchart of FIG. 6 also shows that the calibration result KER is available to both step S12 and step S13, this need not be the case.
  • the expected received signal ESE can only be based on the expected luminescence radiation.
  • step S12 can ignore the calibration result KER and only output the received signal or, for example, an average received signal formed therefrom as a signal for verifying the object to be verified.
  • the verification takes place in a step S14.
  • the received signal ESE coincides with the received signal ES or the corrected received signal ESK, it is decided that the object or its security feature corresponds to the expectations and therefore not, for example, the result of a forgery or
  • FIG. 7 shows the time profile of the intensity I, ie the radiation flux density, over time t.
  • the excitation signal AS is repeated, generated periodically so that there is a time interval between the decay of the intensity I to the initial value before an increase in the intensity and the renewed increase in the intensity I in which the sensor device does not emit any electromagnetic radiation in the first Wavelength range generated.
  • each of the radiation sources can be activated repeatedly in this way
  • Generate excitation signal AS and the phase position of the periodic signals of the various radiation sources can be the same, partially the same or, as is preferred, at least partially offset. Signals with an offset phase position have the advantage that their effects on the measurement signal or the measurement signals can be distinguished from one another.
  • the repeated generation of an excitation signal AS as shown in FIG. 7 enables, in particular, the response of a security feature with at least one
  • FIG. 8 schematically shows such a response.
  • the course of the excitation signals AS from FIG. 7 is shown in FIG. 8 by dashed lines. 8 is also an illustration of the
  • Radiation intensity I over time t is, for example, the one integrated over the detection range of the respective sensor element
  • the received signals ES which are shown in FIG. 8, each show an increasing profile of the intensity I from an initial value or a local minimum of the intensity I to a local maximum and a decrease in the intensity I to a subsequent local minimum.
  • the level of intensity I increases in the
  • the scalings of the intensity axes in FIGS. 7 and 8 do not match one another.
  • the signal in FIG. 7 is the signal of the exciting radiation, only a portion of which contributes to the received signal.
  • the intensity in FIG. 7 is the
  • the received signals ES in FIG. 8 It can be seen from the received signals ES in FIG. 8 that the stimulating radiation leads to luminescence only with a time delay.
  • the received signals ES also contain, in particular, reflected stimulating radiation. With the increase in the intensity of a
  • the excitation signal (as shown in dashed lines in FIG. 8) therefore also increases the intensity of the received signal ES. However, due to the reflection alone, the received signal would drop again in accordance with the signal curves shown in dashed lines. Due to the luminescence, there is also an increasing sequence of the received signals ES Emission of luminescence radiation takes place until a steady state is reached, provided that the excitation signal is generated periodically in the same way and is radiated into the measurement area. It is preferred that a matched filter as above
  • the intensity I of the received signals ES does not drop to the value zero between two excitation signals. This is preferred in order to be able to evaluate the signal profile between two excitation signals well, because the effect on the received signal ES between two excitation signals is not based on reflected signals
  • Step 2 generating electromagnetic radiation in a first wavelength range
  • Step 13 Forming an Expected Received Signal
  • Step 14 comparing the expected received signal and the corrected received signal

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Abstract

L'invention concerne un dispositif capteur de photoluminescence (1) servant à vérifier une propriété de sécurité d'un objet (22) dans une zone de mesure du dispositif capteur (1), le dispositif capteur (1) présentant : - un système de génération de rayonnement (17) qui est conçu pour générer un rayonnement électromagnétique dans une première zone de longueur d'ondes, le rayonnement électromagnétique étant adapté pour amener une substance photoluminescente dans un état d'énergie excité en tant que propriété de sécurité ou en tant que partie d'une propriété de sécurité (23) de l'objet (22), - un système de réception (19) qui est conçu pour recevoir, lors du fonctionnement de mesure, un rayonnement électromagnétique émis par la substance photoluminescente dans une seconde zone de longueur d'ondes, laquelle est différente de la première zone de longueur d'ondes, et pour générer un signal de réception (ES) correspondant, - un système d'évaluation (26) qui est conçu pour évaluer le signal de réception (ES), - un système de commande (25) qui est conçu pour commander le système de génération de rayonnement (17) lors du fonctionnement de mesure et lors d'un fonctionnement de calibration de telle sorte que le rayonnement électromagnétique généré par le système de génération de rayonnement (17) présente, dans au moins un intervalle temporel, un tracé dans le temps de l'épaisseur de débit de rayonnement qui n'est pas constant dans l'intervalle temporel.
EP20743639.5A 2019-07-19 2020-07-16 Dispositif capteur de photoluminescence servant à vérifier une propriété de sécurité d'un objet et procédé de calibrage d'un dispositif capteur de photoluminescence Active EP4000049B1 (fr)

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PCT/EP2020/070205 WO2021013707A1 (fr) 2019-07-19 2020-07-16 Dispositif capteur de photoluminescence servant à vérifier une propriété de sécurité d'un objet et procédé de calibrage d'un dispositif capteur de photoluminescence

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EP4000049B1 (fr) 2023-12-13

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