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EP2195791B1 - Apparatus for calibrating sensors - Google Patents

Apparatus for calibrating sensors Download PDF

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Publication number
EP2195791B1
EP2195791B1 EP08801571.4A EP08801571A EP2195791B1 EP 2195791 B1 EP2195791 B1 EP 2195791B1 EP 08801571 A EP08801571 A EP 08801571A EP 2195791 B1 EP2195791 B1 EP 2195791B1
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EP
European Patent Office
Prior art keywords
calibration
sensor
calibration medium
medium
reel
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.)
Not-in-force
Application number
EP08801571.4A
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German (de)
French (fr)
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EP2195791A1 (en
Inventor
Bernd Wunderer
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Giesecke and Devrient GmbH
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Giesecke and Devrient GmbH
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Publication of EP2195791A1 publication Critical patent/EP2195791A1/en
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    • 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
    • G07D7/20—Testing patterns thereon
    • G07D7/2075—Setting acceptance levels or parameters
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D2205/00—Coin testing devices
    • G07D2205/001—Reconfiguration of coin testing devices
    • G07D2205/0012—Reconfiguration of coin testing devices automatic adjustment, e.g. self-calibration

Definitions

  • the invention relates to a device for the calibration of sensors by means of a calibration medium.
  • the calibration media are movably arranged so that they can be introduced into the detection range of the sensor to be calibrated as required, considerable mechanical effort is generally required in order to be able to bring the calibration media into the detection range of the sensor to be calibrated and remove it again. Additional problems may arise when the objects to be examined, e.g. B. banknotes are transported past the sen sen at high speed. In this case, frequently parts of the transport system used block a simple introduction and removal of the calibration media in the detection range of the sensors to be calibrated. In addition, special measures must be taken to protect the calibration media from contamination as the objects to be examined, e.g. B. banknotes, often with larger amounts of dirt, z. As dust are afflicted, if they are part of the transport system, such as in GB 2 345181 A1 ,
  • the sensors are to detect larger line-shaped or area-shaped areas, which is why they are constructed, for example, as a line scan camera.
  • Such sensors have a plurality of elements which are arranged side by side to z. B. to form the line-shaped sensor with a required length. In such cases it is desirable to be able to carry out a calibration for all the elements forming the sensor.
  • the invention has for its object to provide a device for the calibration of sensors by means of a calibration, which is simple in construction and allows precise calibration.
  • the invention is based on the finding that, starting from a device for calibrating at least one sensor by means of a calibration medium, in which an operating mode for the testing of test objects, in particular banknotes, by means of the at least one sensor and a calibration mode, for the calibration of the at least one Sensor is provided by means of the calibration medium
  • the calibration medium according to the invention consists of stiff, band-shaped material which is wound into a roll, wherein the calibration can be unwound by means of a drive from the winding or wound on the winding, wherein the calibration medium is unwound in the calibration mode for the calibration of the at least one sensor by the drive from the winding and pushed into the detection range of the at least one sensor, and the calibration is wound after completion of the calibration by means of the drive on the winding to the test of DUTs in the detection range of the sensor during operation mode.
  • the advantage of the solution according to the invention is that a compact winding can be wound out of the calibration medium by using a calibration medium made of stiff, strip-shaped material.
  • the calibration medium is less susceptible to aging and contamination.
  • the calibration medium also consists of stiff, band-shaped material, this can be easily unwound from the winding and because of the rigidity of its material, the band-shaped calibration, due to the unwinding, be pushed into the detection range of the sensor to be calibrated, without requiring expensive mechanical Facilities for transport or the guidance or positioning of the calibration medium are needed.
  • FIG. 1 shows a first embodiment of a device according to the invention for the calibration of sensors by means of a calibration medium, in an operating mode.
  • FIG. 1a shows the device in a side view while FIG. 1b represents a view of the device.
  • the device has a sensor 3, which contains one or more detectors and one or more excitation sources.
  • the detectors may be, for example, photodiodes, CCD sensors, ultrasonic sensors, etc.
  • the excitation sources of the sensor 3 are light-emitting diodes, incandescent lamps, discharge lamps, ultrasound sources, etc.
  • the sensor 3 performs remission measurements, ie the signals originating from the excitation sources are remitted from a measurement object or a calibration medium to the detectors of the sensor 3.
  • the further sensor 3 ' may be constructed like the first sensor 3, but it is also possible that the first sensor 3 contains only one or more detectors, while the further sensor 3' contains only one or more excitation sources, so that the resulting Sensor 3, 3 'performs transmission measurements.
  • a calibration medium 1 is provided for the calibration of the sensor 3, 3 '.
  • the calibration medium 1 consists of a rigid material, for. As steel, in particular spring steel, or plastic, which is formed band-shaped.
  • the band-shaped calibration medium 1 is powered by a drive 4, z.
  • the winding or the spiral or roll of the calibration medium 1 may be accommodated in a housing 12, so that the calibration medium 1 against contamination and age-accelerating influences, for. B. intensive lighting is protected.
  • a cleaning element 13 can also be provided, which cleans the calibration medium 1 when it is moved back into the housing 12 in order to avoid the introduction of adhering dirt into the housing 12.
  • the calibration medium 1 is unwound from the winding and moved along a first direction of movement 6 along the sensor 3, 3 '.
  • guide elements 2, 2 ', 2 " can be provided which ensure that the calibration medium 1 is in a precisely defined position with respect to the sensor 3, 3' and its detection area, in particular at one position which is normally occupied by a measurement object, in particular the focus area of the sensor 3, 3 'After the calibration medium 1 has reached an end position 2 ", the motor 4 is stopped.
  • the reference element 1 ' can be printed on the material of the calibration medium 1, for example, or printed on two sides, glued or applied in any other way. But it is also possible that the material of the calibration medium 1 itself forms the reference element 1 ', or that the reference element 1' is introduced into the calibration medium 1.
  • the reference element 1 ' has special properties, which are predetermined and used for the calibration of the sensor 3, 3'.
  • the reference element 1 ' is chosen according to the properties of the sensor 3,3' used, for example, it may be a white reference or a reference element 1 'with a special spectral property, eg. B.
  • the material of the calibration 1 can be selected according to the characteristics of the sensor 3, 3 '. If the sensor 3, 3 'is, for example, a transmission sensor, it must be ensured that, in particular, the material of the calibration medium 1 is transparent to the signals of the excitation source used, if the material itself is not the reference element 1'. During the calibration, it is determined, in particular, whether the values measured by the sensor 3, 3 'coincide with the expected values which must result from the predefined properties of the calibration medium 1 or of the reference element 1'. Occur deviations, a correction is made in the manner described above, z. Example by means of correction factors, which are used in later measurements, or by changing the intensity of the excitation sources of the sensor 3, 3 '.
  • FIG. 2 is the first embodiment of the device according to the invention for the calibration of sensors by means of a calibration medium according to FIG. 1 in an operating mode.
  • the illustration of the further sensor 3 ' has been omitted for reasons of clarity.
  • parts 11 of a transport system are shown, which transport the object to be examined, in particular banknotes 10, in a transport direction T on the sensor 3, which examines a side of the banknotes 10 facing it.
  • Such transport systems are used, for example, in banknote processing machines in which banknotes 10 are checked, sorted, destroyed, accepted, stored, etc.
  • the motor 4 was operated with a second direction of rotation 5 ', so that the calibration 1 was wound onto the winding and along a second direction of movement 6' was removed from the range of the sensor 3, so that in its place the banknote 10 from the transport system 11 on Sensor 3 can be transported past. Upon reaching an end position of the calibration medium 1, the motor 4 is stopped.
  • FIG. 3 shows the first embodiment of the device according to the invention for the calibration of sensors by means of a calibration medium FIG. 1 , along a section AA through the device.
  • FIG. 3a It can be seen how the calibration medium 1 is guided by the guide elements 2 in the region of the sensor 3, so that it occupies the desired position, ie is located in the focus area of the sensor 3, in which the banknotes 10 to be examined are located during normal operation.
  • FIG. 3b a variant of the calibration medium 1 is shown.
  • the calibration medium 1 in this variant has a transverse curvature which biases the calibration medium 1, whereby the above-described stiff properties of the material of the calibration medium 1 are enhanced. Due to the transverse curvature of the calibration medium 1, it can be achieved that the calibration medium 1 aligns itself securely during unwinding in order to cover the sensor 3 precisely in the desired position. Thereby, the number of guide elements 2, 2 'can be kept low or it can even be completely dispensed with.
  • FIG. 4 a second embodiment of a device according to the invention for the calibration of sensors by means of a calibration medium is shown.
  • FIG. 4a shows the device for the calibration of the sensor 3, at a time at which a first reference element 1 ', z. B. a white reference, is above the sensor 3 to calibrate this.
  • the motor 4 is operated with the first direction of rotation 5, whereupon the calibration medium 1 is moved beyond the sensor 3 in the first direction of movement 6.
  • An adjoining the guide element 2 'guide element 7 passes the calibration medium 1 in the direction of a drive shaft of another drive 14, z. B. another engine.
  • the further motor 14 and the calibration medium 1 have elements 8, 9 of a coupling, which connect the drive shaft of the further motor 14 and the calibration medium 1 to one another when the calibration medium 1 is moved further by the first motor 4.
  • the further motor 14 is started with a first direction of rotation 15, which corresponds to the first direction of rotation 5 of the first motor 5.
  • the calibration medium 1 is then formed by the further motor 14 into a winding. Since the calibration medium 1 is now pulled by the further motor 14, the first motor 4 can be switched off.
  • the calibration medium 1 is moved on with the first movement direction 6 until a second reference medium 1 ", for example a reference medium with a special spectral property, covers the detection range of the sensor 3. Whereupon the sensor 3 is calibrated by means of the second reference medium 1".
  • the drive shaft of the first motor 4 and the associated end of the calibration 1 a clutch according to the previously in connection with FIG. 4 have described coupling.
  • the calibration medium 1 does not have to be wound back onto the winding formed by the first motor 4. Rather, the calibration medium 1 is wound up by the second motor 14 until the calibration medium 1 is removed from the detection range of the sensor 3. During the subsequent calibration process, the calibration medium is then rewound by means of the first motor 4.
  • the calibration medium 1 is moved only by unwinding and winding with the first motor 4. In the area behind the guide element 2 ', however, there must be sufficient space for the movement of the calibration medium 1 in this case. It is also possible to use the guide element 7, in this case, sufficient space for the movement of the calibration medium 1 below the guide element 2 'must be present. If the calibration medium 1 is sufficiently stiff, several guide elements can also be used to redirect the calibration medium 1 several times. It is also conceivable a housing, according to the housing 12 made FIG. 1a to use, in which the calibration medium 1 rolls up into a roll when it is moved by the first motor 4.
  • the illustrated guide elements 2, 2 ' can be used. Further arranged in the direction of movement guide elements, for. As the guide element 2 ', the input side can be widened in a funnel shape, so that these guide elements can detect the calibration 1, even if this deviates from the desired position. It can also be provided, for example, that continuous guide elements are used.
  • the calibration medium 1 can be guided on a housing of the sensor 3, 3 '.
  • the calibration medium 1 can be moved along a viewing window arranged in the housing for the sensor 3, 3 ', by means of which the measured objects to be examined by the sensor 3, 3' are moved during normal operation.
  • sensor 3, 3 'and calibration 1 can also be housed in a common housing.
  • the calibration medium 1 should be guided as close as possible to a window provided for the sensor 3, 3 ', so that the calibration medium 1 is as close as possible to the focus region of the sensor 3, 3', to which in the normal operation are located.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Description

Die Erfindung betrifft eine Vorrichtung für die Kalibrierung von Sensoren mittels eines Kalibriermediums.The invention relates to a device for the calibration of sensors by means of a calibration medium.

Für die Kalibrierung von Sensoren werden Kalibriermedien verwendet, die bestimmte, fest vorgegebene Eigenschaften aufweisen. Mittels dieser bekannten Eigenschaften ist es möglich, die Sensoren zu kalibrieren, da die bekannten Eigenschaften der Kalibriermedien bestimmte, zu erwartende Ausgangssignale der Sensoren hervorrufen müssen. Weichen die Ausgangssignale der Sensoren von den aufgrund des verwendeten Kalibriermediums zu erwartenden Ausgangssignalen ab, kann eine Korrektur vorgenommen werden. Dazu werden beispielsweise Korrekturfaktoren bestimmt, mit denen die Ausgangssignale der Sensoren bei anschließenden Messungen beaufschlagt werden. Ebenso kann die Intensität einer Anregungsquelle, beispielsweise einer Beleuchtung, bei der Kalibrierung verändert werden, bis die Ausgangssignale des Sensors die zu erwartenden Werte aufweisen. Die veränderte Intensität der Anregungsquelle wird beibehalten und anschließend für Messungen mit dem Sensor verwendet.For the calibration of sensors calibration media are used, which have certain, fixed properties. By means of these known properties, it is possible to calibrate the sensors, since the known properties of the calibration media must cause certain, expected output signals of the sensors. If the output signals of the sensors deviate from the expected output signals due to the calibration medium used, a correction can be made. For this purpose, for example, correction factors are determined, with which the output signals of the sensors are subjected to subsequent measurements. Likewise, the intensity of an excitation source, for example illumination, can be changed during calibration until the output signals of the sensor have the expected values. The altered intensity of the excitation source is retained and subsequently used for measurements with the sensor.

Besondere Schwierigkeiten treten auf, wenn an die Kalibrierung von Sensoren hohe Ansprüche gestellt werden, weil mittels der Sensoren sensible Messungen vorgenommen werden, z. B. die Erkennung von Art (Währung, Denomination), Echtheit, Zustand (Verschmutzung, Beschädigung) usw. von Banknoten. In derartigen Fällen ist eine sehr präzise Kalibrierung der Sensoren erforderlich, da Fehlbeurteilungen aufgrund falscher Ausgangssignale der Sensoren unbedingt vermieden werden sollen, wie es beispielsweise in US 2007/0140544 A1 beschrieben ist. In diesem Zusammenhang hat sich die Verwendung von Kalibiermedien aus verschiedenen Gründen als problematisch herausgestellt.Particular difficulties occur when high demands are made on the calibration of sensors, because sensitive measurements are made by means of the sensors, for. B. the recognition of type (currency, denomination), authenticity, state (pollution, damage) etc. of banknotes. In such cases, a very precise calibration of the sensors is required because misjudgments due to incorrect output signals of the sensors should be avoided at all costs, as for example in US 2007/0140544 A1 is described. In this context, the use of calibration media has proven to be problematic for a variety of reasons.

Beispielsweise treten Probleme bei der Verwendung von Kalibriermedien auf, die von einer Bedienperson in den Bereich des zu kalibrierenden Sensors gebracht werden, da die unsachgemäße Handhabung zu falschen Ergebnissen bei der Kalibrierung führen kann. Zudem unterliegen die Kalibriermedien wegen der manuellen Handhabung besonderem Verschleiß. Bei unsachgemäßer Lagerung der Kalibriermedien durch die Bedienperson können zudem Alterungseffekte die Eigenschaften der Kalibriermedien verändern, wodurch diese unbrauchbar werden.For example, problems arise with the use of calibration media, which are brought by an operator in the range of the sensor to be calibrated, since the improper handling can lead to incorrect results in the calibration. In addition, the calibration media are subject to special wear due to manual handling. Incorrect storage of the calibration media by the operator may also alter the aging effects of the calibration media, rendering them unusable.

Werden die Kalibriermedien fest in den Erfassungsbereich des zu kalibrierenden Sensors eingebracht, kommt es häufig zu einer Verschmutzung der Kalibriermedien oder zu Alterungseffekten, welche die Kalibriermedien unbrauchbar machen. Zudem ist es wichtig, die Kalibiermedien möglichst nahe in den Fokusbereich des zu kalibrierenden Sensors zu bringen, damit eine möglichst gute Kalibrierung erfolgen kann. Bei fest angebrachten Kalibriermedien verursacht diese Forderung jedoch erhebliche Schwierigkeiten, da in Fokusbereich normalerweise die zu messenden Objekte angeordnet sind, z. B. die oben erwähnten Banknoten.If the calibration media are firmly introduced into the detection range of the sensor to be calibrated, contamination of the calibration media or aging effects that make the calibration media unusable are frequently the result. In addition, it is important to bring the calibration media as close as possible to the focus area of the sensor to be calibrated so that the best possible calibration can be carried out. With permanently attached calibration media, however, this requirement causes considerable difficulties, since in the focus area normally the objects to be measured are arranged, for. B. the banknotes mentioned above.

Werden die Kalibriermedien beweglich angeordnet, so daß sie bei Bedarf in den Erfassungsbereich des zu kalibrierenden Sensors eingebracht werden können, ist in der Regel erheblicher mechanischer Aufwand erforderlich, um die Kalibriermedien in den Erfassungsbereich des zu kalibrierenden Sensors bringen und wieder entfernen zu können. Zusätzliche Probleme können entstehen, wenn die zu untersuchenden Objekte, z. B. Banknoten, an den Senso ren mit großer Geschwindigkeit vorbeitransportiert werden. In diesem Fall versperren häufig Teile des verwendeten Transportsystems ein einfaches Ein- und Ausbringen der Kalibriermedien in den Erfassungsbereich der zu kalibrierenden Sensoren. Zudem müssen besondere Maßnahmen ergriffen werden, um die Kalibriermedien vor Verschmutzung zu schützen, da die zu untersuchenden Objekte, z. B. Banknoten, häufig mit größeren Mengen Schmutz, z. B. Staub, behaftet sind, falls sie Teil des Transportsystems sind, wie beispielsweise in GB 2 345181 A1 .If the calibration media are movably arranged so that they can be introduced into the detection range of the sensor to be calibrated as required, considerable mechanical effort is generally required in order to be able to bring the calibration media into the detection range of the sensor to be calibrated and remove it again. Additional problems may arise when the objects to be examined, e.g. B. banknotes are transported past the sen sen at high speed. In this case, frequently parts of the transport system used block a simple introduction and removal of the calibration media in the detection range of the sensors to be calibrated. In addition, special measures must be taken to protect the calibration media from contamination as the objects to be examined, e.g. B. banknotes, often with larger amounts of dirt, z. As dust are afflicted, if they are part of the transport system, such as in GB 2 345181 A1 ,

Weitere Probleme können dadurch entstehen, wenn die Sensoren größere zeilen- oder flächenförmige Gebiete erfassen sollen, weshalb sie beispielsweise als Zeilenkamera aufgebaut sind. Derartige Sensoren weisen eine Vielzahl von Elementen auf, die nebeneinander angeordnet sind, um z. B. den zeilenförmigen Sensor mit einer erforderlichen Länge zu bilden. In derartigen Fällen ist es wünschenswert eine Kalibrierung für alle den Sensor bildenden Elemente durchführen zu können.Further problems can arise if the sensors are to detect larger line-shaped or area-shaped areas, which is why they are constructed, for example, as a line scan camera. Such sensors have a plurality of elements which are arranged side by side to z. B. to form the line-shaped sensor with a required length. In such cases it is desirable to be able to carry out a calibration for all the elements forming the sensor.

Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Vorrichtung für die Kalibrierung von Sensoren mittels eines Kalibriermediums anzugeben, welche einfach aufgebaut ist und eine präzise Kalibrierung ermöglicht.Starting from this prior art, the invention has for its object to provide a device for the calibration of sensors by means of a calibration, which is simple in construction and allows precise calibration.

Die Lösung dieser Aufgabe ergibt sich aus den Merkmalen des Anspruchs 1. Weiterbildungen sind Gegenstand der Unteransprüche.The solution to this problem arises from the features of claim 1. Further developments are the subject of the dependent claims.

Die Erfindung beruht auf der Erkenntnis, daß ausgehend von einer Vorrichtung für die Kalibrierung mindestens eines Sensors mittels eines Kalibriermediums, bei der ein Betriebsmodus für die Prüfung von Meßobjekten, insbesondere Banknoten, mittels des mindestens einen Sensors und einem Kalibriermodus, für die Kalibrierung des mindestens einen Sensors mittels des Kalibriermediums vorgesehen ist, wobei das Kalibriermedium erfindungsgemäß aus steifem, bandförmigem Material bestehet, das zu einem Wickel aufgewickelt ist, wobei das Kalibriermedium mittels eines Antriebs von dem Wickel abgewickelt oder auf den Wickel aufgewickelt werden kann, wobei das Kalibriermedium im Kalibriermodus für die Kalibrierung des mindestens einen Sensors mittels des Antriebs von dem Wickel abgewickelt und in den Erfassungsbereich des mindestens einen Sensors geschoben wird, und das Kalibriermedium nach Beendigung des Kalibriermodus mittels des Antriebs auf den Wickel aufgewickelt wird, um die Prüfung von Meßobjekten im Erfassungsbereich des Sensors während des Betriebsmodus zu ermöglichen.The invention is based on the finding that, starting from a device for calibrating at least one sensor by means of a calibration medium, in which an operating mode for the testing of test objects, in particular banknotes, by means of the at least one sensor and a calibration mode, for the calibration of the at least one Sensor is provided by means of the calibration medium, the calibration medium according to the invention consists of stiff, band-shaped material which is wound into a roll, wherein the calibration can be unwound by means of a drive from the winding or wound on the winding, wherein the calibration medium is unwound in the calibration mode for the calibration of the at least one sensor by the drive from the winding and pushed into the detection range of the at least one sensor, and the calibration is wound after completion of the calibration by means of the drive on the winding to the test of DUTs in the detection range of the sensor during operation mode.

Der Vorteil der erfindungsgemäßen Lösung besteht darin, daß durch die Verwendung eines Kalibriermediums aus steifem, bandförmigem Material, ein kompakter Wickel aus dem Kalibriermedium aufgewickelt werden kann. In dem Wickel ist das Kalibriermedium wenig anfällig für Alterung und Verschmutzung. Weil das Kalibriermedium zudem aus steifem, bandförmigem Material besteht, kann dies einfach von dem Wickel abgewickelt werden und wegen der Steifigkeit seines Materials kann das bandförmige Kalibriermedium, bedingt durch das Abwickeln, in den Erfassungsbereich des zu kalibrierenden Sensors geschoben werden, ohne daß dafür aufwendige mechanische Einrichtungen für den Transport oder die Führung bzw. Positionierung des Kalibriermediums benötigt werden. Zudem wird es ohne weiteres möglich auch Sensoren mit einer größeren zeilen- oder flächenmäßigen Ausdehnung zu kalibrieren, wobei alle Elemente derartiger zeilen- oder flächenmäßiger Sensoren in die Kalibrierung einbezogen werden können, da das bandförmige Kalibriermedium so bemessen werden kann, daß es sich bei der Kalibrierung über alle Elemente des Sensors erstreckt.The advantage of the solution according to the invention is that a compact winding can be wound out of the calibration medium by using a calibration medium made of stiff, strip-shaped material. In the winding, the calibration medium is less susceptible to aging and contamination. Because the calibration medium also consists of stiff, band-shaped material, this can be easily unwound from the winding and because of the rigidity of its material, the band-shaped calibration, due to the unwinding, be pushed into the detection range of the sensor to be calibrated, without requiring expensive mechanical Facilities for transport or the guidance or positioning of the calibration medium are needed. In addition, it is readily possible to calibrate sensors with a larger line or area extent, with all elements of such line or area sensors can be included in the calibration, since the band-shaped calibration can be sized so that it is in the calibration extends over all elements of the sensor.

Weitere Ausführungsformen und Vorteile der Erfindung werden im Folgenden anhand der Figuren sowie deren Beschreibung erläutert.Further embodiments and advantages of the invention are explained below with reference to the figures and their description.

Es zeigen

Figur 1
eine erste Ausführungsform einer erfindungsgemäßen Vorrichtung für die Kalibrierung von Sensoren mittels eines Kalibriermediums, in einem Kalibriermodus,
Figur 2
die erste Ausführungsform der erfindungsgemäßen Vorrichtung für die Kalibrierung von Sensoren mittels eines Kalibriermediums nach Figur 1, in einem Betriebsmodus,
Figur 3
die erste Ausführungsform der erfindungsgemäßen Vorrichtung für die Kalibrierung von Sensoren mittels eines Kalibriermediums nach Figur 1, entlang eines Schnitts A-A durch die Vorrichtung, und
Figur 4
eine zweite Ausführungsform einer erfindungsgemäßen Vorrichtung für die Kalibrierung von Sensoren mittels eines Kalibriermediums.
Show it
FIG. 1
a first embodiment of a device according to the invention for the calibration of sensors by means of a calibration medium, in a calibration mode,
FIG. 2
the first embodiment of the device according to the invention for the calibration of sensors by means of a calibration medium according to FIG. 1 in an operating mode,
FIG. 3
the first embodiment of the device according to the invention for the calibration of sensors by means of a calibration medium according to FIG. 1 along a section AA through the device, and
FIG. 4
A second embodiment of a device according to the invention for the calibration of sensors by means of a calibration medium.

Figur 1 zeigt eine erste Ausführungsform einer erfindungsgemäßen Vorrichtung für die Kalibrierung von Sensoren mittels eines Kalibriermediums, in einem Betriebsmodus. Figur 1a zeigt die Vorrichtung in einer Seitenansicht, während Figur 1b eine Sicht auf die Vorrichtung darstellt. FIG. 1 shows a first embodiment of a device according to the invention for the calibration of sensors by means of a calibration medium, in an operating mode. FIG. 1a shows the device in a side view while FIG. 1b represents a view of the device.

Die Vorrichtung weist einen Sensor 3 auf, der einen oder mehrere Detektoren sowie eine oder mehrere Anregungsquellen enthält. Bei den Detektoren kann es sich beispielsweise um Fotodioden, CCD-Sensoren, Ultraschallsensoren usw. handeln. Entsprechend der Detektoren sind die Anregungsquellen des Sensors 3 Leuchtdioden, Glühlampen, Entladungslampen, Ultraschallquellen usw. Der Sensor 3 führt Remissionsmessungen durch, d. h. die von den Anregungsquellen stammenden Signale werden von einem Meßobjekt oder einem Kalibriermedium zu den Detektoren des Sensors 3 remittiert. Wie dargestellt, kann ein weiterer Sensor 3' vorgesehen werden, der dem ersten Sensor 3 gegenüberliegend angeordnet ist, so daß sich das Meßobjekt oder Kalibriermedium zwischen den beiden Sensoren 3, 3' befindet. Der weitere Sensor 3' kann wie der erste Sensor 3 aufgebaut sein, es ist aber auch möglich, daß der erste Sensor 3 nur einen oder mehrere Detektoren enthält, während der weitere Sensor 3' nur eine oder mehrere Anregungsquellen enthält, so daß der sich ergebende Sensor 3, 3' Transmissionsmessungen durchführt.The device has a sensor 3, which contains one or more detectors and one or more excitation sources. The detectors may be, for example, photodiodes, CCD sensors, ultrasonic sensors, etc. According to the detectors, the excitation sources of the sensor 3 are light-emitting diodes, incandescent lamps, discharge lamps, ultrasound sources, etc. The sensor 3 performs remission measurements, ie the signals originating from the excitation sources are remitted from a measurement object or a calibration medium to the detectors of the sensor 3. As shown, a further sensor 3 'can be provided, which is the first sensor 3 is arranged opposite, so that the object to be measured or calibration medium between the two sensors 3, 3 'is located. The further sensor 3 'may be constructed like the first sensor 3, but it is also possible that the first sensor 3 contains only one or more detectors, while the further sensor 3' contains only one or more excitation sources, so that the resulting Sensor 3, 3 'performs transmission measurements.

Für die Kalibrierung des Sensors 3, 3' ist ein Kalibriermedium 1 vorgesehen. Das Kalibriermedium 1 besteht aus einem steifen Material, z. B. Stahl, insbesondere Federstahl, oder Kunststoff, welches bandförmig ausgebildet ist. Das bandförmige Kalibriermedium 1 wird von einem Antrieb 4, z. B. einem Motor, spiralförmig aufgewickelt. Der Wickel bzw. die Spirale oder Rolle des Kalibriermediums 1 kann in einem Gehäuse 12 untergebracht sein, damit das Kalibriermedium 1 vor Verschmutzung und alterungsbeschleunigenden Einflüssen, z. B. intensive Beleuchtung, geschützt ist. Im Bereich des Eingangs des Gehäuses 12 kann zudem ein Reinigungselement 13 vorgesehen werden, welches das Kalibriermedium 1 reinigt, wenn es in das Gehäuse 12 zurückbewegt wird, um die Einbringung von anhaftendem Schmutz in das Gehäuse 12 zu vermeiden. Wird der Motor 4 mit einer ersten Drehrichtung 5 betreiben, wird das Kalibriermedium 1 von dem Wickel abgewickelt und entlang einer ersten Bewegungsrichtung 6 entlang des Sensors 3, 3' bewegt. Zur sicheren Positionierung und Bewegung des Kalibriermediums können Führungselemente 2, 2', 2" vorgesehen sein, welche sicherstellen, daß das Kalibriermedium 1 sich an einer genau festgelegten Position in Bezug zu dem Sensor 3, 3' und seinem Erfassungsbereich befindet, insbesondere an einer Position, die normalerweise von einem Meßobjekt eingenommen wird, insbesondere dem Fokusbereich des Sensors 3, 3'. Nachdem das Kalibriermedium 1 eine Endposition 2" erreicht hat, wird der Motor 4 gestoppt.For the calibration of the sensor 3, 3 ', a calibration medium 1 is provided. The calibration medium 1 consists of a rigid material, for. As steel, in particular spring steel, or plastic, which is formed band-shaped. The band-shaped calibration medium 1 is powered by a drive 4, z. As a motor wound spirally. The winding or the spiral or roll of the calibration medium 1 may be accommodated in a housing 12, so that the calibration medium 1 against contamination and age-accelerating influences, for. B. intensive lighting is protected. In the region of the entrance of the housing 12, a cleaning element 13 can also be provided, which cleans the calibration medium 1 when it is moved back into the housing 12 in order to avoid the introduction of adhering dirt into the housing 12. If the motor 4 is operated with a first direction of rotation 5, the calibration medium 1 is unwound from the winding and moved along a first direction of movement 6 along the sensor 3, 3 '. For secure positioning and movement of the calibration medium, guide elements 2, 2 ', 2 "can be provided which ensure that the calibration medium 1 is in a precisely defined position with respect to the sensor 3, 3' and its detection area, in particular at one position which is normally occupied by a measurement object, in particular the focus area of the sensor 3, 3 'After the calibration medium 1 has reached an end position 2 ", the motor 4 is stopped.

Im Erfassungsbereich des Sensors 3, 3' befindet sich nunmehr ein Referenzelement 1', welches Bestandteil des Kalibriermediums 1 ist, um die Kalibrierung des Sensors 3, 3' durchzuführen. Das Referenzelement 1' kann beispielsweise auf das Material des Kalibriermediums 1 ein- oder zweiseitig aufgedruckt, aufgeklebt oder in anderer Weise aufgebracht sein. Es ist aber auch möglich, daß das Material des Kalibriermediums 1 selbst das Referenzelement 1' bildet, bzw. daß das Referenzelement 1' in das Kalibriermedium 1 eingebracht wird. Das Referenzelement 1' weist besondere Eigenschaften auf, die vorgegeben sind und für die Kalibrierung des Sensors 3, 3' verwendet werden. Das Referenzelement 1' wird entsprechend der Eigenschaften des verwendeten Sensors 3,3' gewählt, beispielsweise kann es sich um eine Weißreferenz handeln oder um ein Referenzelement 1' mit einer besonderen spektralen Eigenschaft, z. B. besondere rote, grüne oder blaue Farbeigenschaften aufweisen. Auch das Material des Kalibriermediums 1 kann entsprechend der Eigenschaften des Sensors 3, 3' gewählt werden. Handelt es sich bei dem Sensor 3, 3' beispielsweise um einen Transmissionssensor, muß sichergestellt sein, daß insbesondere das Material des Kalibriermediums 1 für die Signale der verwendeten Anregungsquelle transparent ist, falls das Material selbst nicht das Referenzelement 1' ist. Bei der Kalibrierung wird insbesondere ermittelt, ob die vom Sensor 3, 3' gemessenen Werte mit den erwarteten Werten übereinstimmen, die sich aus den vorgegebenen Eigenschaften des Kalibriermediums 1 bzw. des Referenzelements 1' ergeben müsssen. Treten Abweichungen auf, wird in der eingangs beschriebenen Weise eine Korrektur vorgenommen, z. B. mittels Korrekturfaktoren, die bei späteren Messungen verwendet werden, oder durch Veränderung der Intensität der Anregungsquellen des Sensors 3, 3'.In the detection range of the sensor 3, 3 'is now a reference element 1', which is part of the calibration 1, to perform the calibration of the sensor 3, 3 '. The reference element 1 'can be printed on the material of the calibration medium 1, for example, or printed on two sides, glued or applied in any other way. But it is also possible that the material of the calibration medium 1 itself forms the reference element 1 ', or that the reference element 1' is introduced into the calibration medium 1. The reference element 1 'has special properties, which are predetermined and used for the calibration of the sensor 3, 3'. The reference element 1 'is chosen according to the properties of the sensor 3,3' used, for example, it may be a white reference or a reference element 1 'with a special spectral property, eg. B. have particular red, green or blue color properties. Also, the material of the calibration 1 can be selected according to the characteristics of the sensor 3, 3 '. If the sensor 3, 3 'is, for example, a transmission sensor, it must be ensured that, in particular, the material of the calibration medium 1 is transparent to the signals of the excitation source used, if the material itself is not the reference element 1'. During the calibration, it is determined, in particular, whether the values measured by the sensor 3, 3 'coincide with the expected values which must result from the predefined properties of the calibration medium 1 or of the reference element 1'. Occur deviations, a correction is made in the manner described above, z. Example by means of correction factors, which are used in later measurements, or by changing the intensity of the excitation sources of the sensor 3, 3 '.

In Figur 2 ist die erste Ausführungsform der erfindungsgemäßen Vorrichtung für die Kalibrierung von Sensoren mittels eines Kalibriermediums nach Figur 1 in einem Betriebsmodus dargestellt. Auf die Darstellung des weiteren Sensors 3' wurde aus Gründen der Übersichtlichkeit verzichtet.In FIG. 2 is the first embodiment of the device according to the invention for the calibration of sensors by means of a calibration medium according to FIG. 1 in an operating mode. The illustration of the further sensor 3 'has been omitted for reasons of clarity.

Im Gegensatz zu Figur 1 sind zusätzlich Teile 11 eines Transportsystems dargestellt, welche das zu untersuchende Objekt, insbesondere Banknoten 10, in einer Transportrichtung T am Sensor 3 vorbeitransportieren, der dabei eine ihm zugewandte Seite der Banknoten 10 untersucht. Derartige Transportsysteme werden beispielsweise in Banknotenbearbeitungsmaschinen verwendet, in der Banknoten 10 geprüft, sortiert, zerstört, angenommen, gespeichert usw. werden.In contrast to FIG. 1 In addition, parts 11 of a transport system are shown, which transport the object to be examined, in particular banknotes 10, in a transport direction T on the sensor 3, which examines a side of the banknotes 10 facing it. Such transport systems are used, for example, in banknote processing machines in which banknotes 10 are checked, sorted, destroyed, accepted, stored, etc.

Wie ersichtlich, wurde der Motor 4 mit einer zweiten Drehrichtung 5' betreiben, damit das Kalibriermedium 1 auf den Wickel aufgewickelt und entlang einer zweiten Bewegungsrichtung 6' aus dem Bereich des Sensors 3 entfernt wurde, damit an seiner Stelle die Banknote 10 vom Transportsystem 11 am Sensor 3 vorbeitransportiert werden kann. Bei Erreichen einer Endposition des Kalibriermediums 1 wird der Motor 4 gestoppt.As can be seen, the motor 4 was operated with a second direction of rotation 5 ', so that the calibration 1 was wound onto the winding and along a second direction of movement 6' was removed from the range of the sensor 3, so that in its place the banknote 10 from the transport system 11 on Sensor 3 can be transported past. Upon reaching an end position of the calibration medium 1, the motor 4 is stopped.

Figur 3 zeigt die erste Ausführungsform der erfindungsgemäßen Vorrichtung für die Kalibrierung von Sensoren mittels eines Kalibriermediums nach Figur 1, entlang eines Schnitts A-A durch die Vorrichtung. FIG. 3 shows the first embodiment of the device according to the invention for the calibration of sensors by means of a calibration medium FIG. 1 , along a section AA through the device.

Aus Figur 3a ist ersichtlich, wie das Kalibriermedium 1 von den Führungselementen 2 im Bereich des Sensors 3 geführt wird, damit es die gewünschte Position einnimmt, d. h. sich möglicht im Fokusbereich des Sensors 3 befindet, in der sich während des normalen Betriebs die zu untersuchenden Banknoten 10 befinden.Out FIG. 3a It can be seen how the calibration medium 1 is guided by the guide elements 2 in the region of the sensor 3, so that it occupies the desired position, ie is located in the focus area of the sensor 3, in which the banknotes 10 to be examined are located during normal operation.

In Figur 3b ist eine Variante des Kalibriermediums 1 dargestellt. Das Kalibriermedium 1 weist bei dieser Variante einer Querkrümmung auf, welche das Kalibriermedium 1 vorspannt, wodurch die oben beschriebenen steifen Eigenschaften des Materials des Kalibriermediums 1 verstärkt werden. Durch die Querkrümmung des Kalibriermediums 1 kann erreicht werden, daß das Kalibriermedium 1 sich beim Abwickeln sicher gerade ausrichtet, um den Sensor 3 genau in der gewünschten Position abzudecken. Dadurch kann die Anzahl der Führungselemente 2, 2' gering gehalten werden oder es kann sogar vollständig auf diese verzichtet werden.In FIG. 3b a variant of the calibration medium 1 is shown. The calibration medium 1 in this variant has a transverse curvature which biases the calibration medium 1, whereby the above-described stiff properties of the material of the calibration medium 1 are enhanced. Due to the transverse curvature of the calibration medium 1, it can be achieved that the calibration medium 1 aligns itself securely during unwinding in order to cover the sensor 3 precisely in the desired position. Thereby, the number of guide elements 2, 2 'can be kept low or it can even be completely dispensed with.

In Figur 4 ist eine zweite Ausführungsform einer erfindungsgemäßen Vorrichtung für die Kalibrierung von Sensoren mittels eines Kalibriermediums dargestellt.In FIG. 4 a second embodiment of a device according to the invention for the calibration of sensors by means of a calibration medium is shown.

Die wesentlichen Bestandteile sowie die Funktion der Vorrichtung für die Kalibrierung von Sensoren nach der zweiten Ausführungsform entsprechen der oben im Zusammenhang mit den Figuren 1 bis 3 beschriebenen Vorrichtung nach der ersten Ausführungsform. Entsprechend werden für diese Bestandteile dieselben Bezugszeichen verwendet.The essential components and the function of the device for the calibration of sensors according to the second embodiment correspond to those described above in connection with FIGS FIGS. 1 to 3 described device according to the first embodiment. Accordingly, the same reference numerals are used for these components.

Figur 4a zeigt die Vorrichtung für die Kalibrierung des Sensors 3, zu einem Zeitpunkt an dem sich ein erstes Referenzelement 1', z. B. einer Weißreferenz, über dem Sensor 3 befindet, um diesen zu kalibrieren. Nach Durchführung der Kalibrierung des Sensors 3 mittels des ersten Referenzelements 1' wird der Motor 4 mit der ersten Drehrichtung 5 betrieben, woraufhin das Kalibriermedium 1 in der ersten Bewegungsrichtung 6 über den Sensor 3 hinaus bewegt wird. Ein sich an das Führungselement 2' anschließendes Leitelement 7 leitet das Kalibriermedium 1 in Richtung einer Antriebswelle eines weiteren Antriebs 14, z. B. eines weiteren Motors. Die Antriebswelle des weiteren Motors 14 und das Kalibriermedium 1 weisen Elemente 8, 9 einer Kupplung auf, welche die Antriebswelle des weiteren Motors 14 und das Kalibriermedium 1 miteinander verbinden, wenn das Kalibriermedium 1 vom ersten Motor 4 weiterbewegt wird. FIG. 4a shows the device for the calibration of the sensor 3, at a time at which a first reference element 1 ', z. B. a white reference, is above the sensor 3 to calibrate this. After performing the calibration of the sensor 3 by means of the first reference element 1 ', the motor 4 is operated with the first direction of rotation 5, whereupon the calibration medium 1 is moved beyond the sensor 3 in the first direction of movement 6. An adjoining the guide element 2 'guide element 7 passes the calibration medium 1 in the direction of a drive shaft of another drive 14, z. B. another engine. The drive shaft The further motor 14 and the calibration medium 1 have elements 8, 9 of a coupling, which connect the drive shaft of the further motor 14 and the calibration medium 1 to one another when the calibration medium 1 is moved further by the first motor 4.

Nachdem die Kupplung 8,9 eingerastet ist (Figur 4b), wird auch der weitere Motor 14 mit einer ersten Drehrichtung 15 gestartet, die der ersten Drehrichtung 5 des ersten Motors 5 entspricht. Das Kalibriermedium 1 wird dann vom weiteren Motor 14 zu einem Wickel geformt. Da das Kalibriermedium 1 nunmehr vom weiteren Motor 14 gezogen wird, kann der erste Motor 4 abgeschaltet werden. Das Kalibriermediums 1 wird mit der ersten Bewegungsrichtung 6 solange weiterbewegt, bis ein zweites Referenzmedium 1", beispielsweise ein Referenzmedium mit einer speziellen spektralen Eigenschaft, den Erfassungsbereich des Sensors 3 abdeckt. Woraufhin der Sensor 3 mittels des zweiten Referenzmediums 1" kalibriert wird.After the clutch 8,9 is engaged ( FIG. 4b ), the further motor 14 is started with a first direction of rotation 15, which corresponds to the first direction of rotation 5 of the first motor 5. The calibration medium 1 is then formed by the further motor 14 into a winding. Since the calibration medium 1 is now pulled by the further motor 14, the first motor 4 can be switched off. The calibration medium 1 is moved on with the first movement direction 6 until a second reference medium 1 ", for example a reference medium with a special spectral property, covers the detection range of the sensor 3. Whereupon the sensor 3 is calibrated by means of the second reference medium 1".

Es kann vorgesehen sein, daß auch die Antriebswelle des ersten Motors 4 und das damit verbunden Ende des Kalibriermediums 1 eine Kupplung entsprechend der zuvor in Zusammenhang mit Figur 4 beschriebenen Kupplung aufweisen. In diesem Fall muß das Kalibriermedium 1 nach Beendigung ges Kalibriervorgangs nicht zurück auf den durch den ersten Motor 4 gebildeten Wickel gewickelt werden. Vielmehr wird das Kalibriermedium 1 vom zweiten Motor 14 solange aufgewickelt, bis das Kalibriermedium 1 aus dem Erfassungsbereich des Sensors 3 entfernt ist. Beim nachfolgenden Kalibriervorgang wird das Kalibriermedium dann wieder mittels des ersten Motors 4 aufgewickelt.It can be provided that the drive shaft of the first motor 4 and the associated end of the calibration 1 a clutch according to the previously in connection with FIG. 4 have described coupling. In this case, after completion of the calibration process, the calibration medium 1 does not have to be wound back onto the winding formed by the first motor 4. Rather, the calibration medium 1 is wound up by the second motor 14 until the calibration medium 1 is removed from the detection range of the sensor 3. During the subsequent calibration process, the calibration medium is then rewound by means of the first motor 4.

Ebenso kann es vorgesehen sein, daß kein weiterer Motor 14 vorgesehen ist. In diesem Fall wird das Kalibriermedium 1 nur durch Ab- und Aufwickeln mit dem ersten Motor 4, bewegt. Im Bereich hinter dem Führungselement 2' muß in diesem Fall jedoch ausreichend Platz für die Bewegung des Kalibriermediums 1 sein. Es ist auch möglich das Leitelement 7 zu verwenden, in diesem Fall muß ausreichend Platz für die Bewegung des Kalibiermediums 1 unterhalb des Führungselements 2' vorhanden sein. Falls das Kalibriermedium 1 ausreichend steif ist, können auch mehrere Leitelemente verwendet werden, um das Kalibriermedium 1 mehrfach umzulenken. Dabei ist es auch denkbar ein Gehäuse, entsprechend des Gehäuses 12 aus Figur 1a, zu verwenden, in welchem sich das Kalibriermedium 1 zu einem Wickel aufrollt, wenn es durch den ersten Motor 4 bewegt wird.Likewise, it may be provided that no further motor 14 is provided. In this case, the calibration medium 1 is moved only by unwinding and winding with the first motor 4. In the area behind the guide element 2 ', however, there must be sufficient space for the movement of the calibration medium 1 in this case. It is also possible to use the guide element 7, in this case, sufficient space for the movement of the calibration medium 1 below the guide element 2 'must be present. If the calibration medium 1 is sufficiently stiff, several guide elements can also be used to redirect the calibration medium 1 several times. It is also conceivable a housing, according to the housing 12 made FIG. 1a to use, in which the calibration medium 1 rolls up into a roll when it is moved by the first motor 4.

Falls es für die sichere Führung des Kalibriermediums 1 erforderlich ist, können auch mehr als die dargestellten Führungselemente 2, 2' verwendet werden. Weitere in der Bewegungsrichtung angeordnete Führungselemente, z. B. das Führungselement 2', können eingangsseitig trichterförmig aufgeweitet sein, so daß diese Führungselemente das Kalibriermedium 1 erfassen können, auch wenn dieses von der Solllage abweicht. Es kann beispielsweise auch vorgesehen sein, daß durchgängige Führungselemente verwendet werden.If it is necessary for the safe guidance of the calibration medium 1, more than the illustrated guide elements 2, 2 'can be used. Further arranged in the direction of movement guide elements, for. As the guide element 2 ', the input side can be widened in a funnel shape, so that these guide elements can detect the calibration 1, even if this deviates from the desired position. It can also be provided, for example, that continuous guide elements are used.

Statt der Verwendung von Führungselementen 2, 2', oder zusätzlich zu den Führungselementen 2, 2', kann das Kalibriermedium 1 auf einem Gehäuse des Sensors 3, 3' geführt werden. Beispielsweise kann das Kalibriermedium 1 entlang eines im Gehäuse angeordneten Sichtfensters für den Sensor 3, 3' bewegt werden, über das im normalen Betrieb die vom Sensor 3, 3' zu untersuchenden Meßobjekte bewegt werden.Instead of using guide elements 2, 2 ', or in addition to the guide elements 2, 2', the calibration medium 1 can be guided on a housing of the sensor 3, 3 '. For example, the calibration medium 1 can be moved along a viewing window arranged in the housing for the sensor 3, 3 ', by means of which the measured objects to be examined by the sensor 3, 3' are moved during normal operation.

Um den Sensor 3, 3' und das Kalibriermedium 1 vor Umwelteinflüssen, z. B. vor Verschmutzung, zu schützen, können Sensor 3, 3' und Kalibriermedium 1 auch in einem gemeinsamen Gehäuse untergebracht sein. In diesem Fall sollte das Kalibriermedium 1 so nahe wie möglich an einem für den Sensor 3, 3' vorgesehenen Fenster entlanggeführt werden, damit sich das Kalibriermedium 1 möglichst nahe dem Fokusbereich des Sensors 3, 3'befindet, an dem sich im normalen Betrieb die zu untersuchenden Meßobjekte befinden.To the sensor 3, 3 'and the calibration medium 1 from environmental influences, for. As to prevent contamination, sensor 3, 3 'and calibration 1 can also be housed in a common housing. In this case, the calibration medium 1 should be guided as close as possible to a window provided for the sensor 3, 3 ', so that the calibration medium 1 is as close as possible to the focus region of the sensor 3, 3', to which in the normal operation are located.

Claims (9)

  1. An apparatus having at least one sensor (3, 3') and a calibration medium (1), having an operating mode for checking measuring objects (10), in particular bank notes, by means of the at least one sensor (3, 3') and a calibrating mode for calibrating the at least one sensor (3, 3') by means of the calibration medium (1), characterized in that
    the calibration medium (1) consists of rigid, band-shaped material which is wound into a reel,
    the calibration medium (1) can be unwound from the reel or wound onto the reel by means of a drive (4, 14),
    in the calibrating mode for calibrating the at least one sensor (3, 3'), the calibration medium (1) is unwound from the reel by means of the drive (4) and pushed into the capture region of the at least one sensor (3, 3'), and
    after termination of the calibrating mode, the calibration medium (1) is wound onto the reel by means of the drive (4, 14) in order to enable the check of measuring objects (10) in the capture region of the sensor during the operating mode.
  2. The apparatus according to claim 1, wherein the material of the calibration medium (1) consists of steel, in particular spring steel, or plastic.
  3. The apparatus according to claim 1 or 2, wherein the calibration medium (1) has a transverse curvature.
  4. The apparatus according to any of claims 1 to 3, wherein the calibration medium (1) has at least one reference element (1', 1") which is mounted on at least one surface or within the material of the calibration medium (1), and is in particular a white reference or a reference having special spectral properties, wherein if different reference elements (1, 1') are present they are disposed successively on or in the band-shaped calibration medium (1) and pushed into the capture region of the at least one sensor (3, 3') successively by the drive (4) during the calibrating mode.
  5. The apparatus according to any of claims 1 to 4, wherein guide elements (2, 2', 2") are provided in order to position the calibration medium (1) in the capture region of the sensor (3, 3'), in particular within a focus region of the sensor (3, 3').
  6. The apparatus according to any of claims 1 to 5, wherein a housing (12) is provided for the reel of the reference medium (1).
  7. The apparatus according to claim 6, wherein a cleaning element (13) for the reference medium (1) is provided which cleans the reference medium (1) before it is introduced into the housing (12).
  8. The apparatus according to any of claims 1 to 7, wherein a further drive (14) is present to which the calibration medium (1) can be connected by means of a coupling (8, 9) in order to wind the calibration medium (1) unwound from the reel by the drive (4) into a further reel after crossing the sensor (3, 3').
  9. The apparatus according to any of claims 1 to 8, wherein the apparatus is part of a bank-note processing machine.
EP08801571.4A 2007-08-16 2008-08-13 Apparatus for calibrating sensors Not-in-force EP2195791B1 (en)

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DE102011106523A1 (en) * 2011-07-04 2013-01-10 Giesecke & Devrient Gmbh Test apparatus and method for calibrating a tester
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DE102011110894A1 (en) 2011-08-17 2013-02-21 Giesecke & Devrient Gmbh Sensor and method for operating the sensor
DE102014206580A1 (en) * 2014-04-04 2015-10-08 Texmag Gmbh Vertriebsgesellschaft MATERIAL BAND AS CALIBRATION TEMPLATE
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US5282053A (en) * 1991-10-23 1994-01-25 Xerox Corporation Scan image processing
GB2345181A (en) * 1998-11-10 2000-06-28 Money Products International L Currency validator
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DE20104446U1 (en) * 2001-03-13 2001-06-21 pe Diagnostik GmbH, 04416 Markkleeberg Fluorescence standard
US7414723B2 (en) * 2004-02-23 2008-08-19 Malvern Instruments Incorporated Automated interleaved spectral imaging calibration
DE102004021448B4 (en) * 2004-04-30 2016-12-29 Carl Zeiss Spectroscopy Gmbh Spectrometric reflection probe and method for its internal recalibration
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