DE102010023604A1 - Light barrier for use in material recycling industry for determining material of light wave-transmissive object, has polarizers arranged between transmitter and receiver, where polarizers perform circular polarization in opposite directions - Google Patents
Light barrier for use in material recycling industry for determining material of light wave-transmissive object, has polarizers arranged between transmitter and receiver, where polarizers perform circular polarization in opposite directions Download PDFInfo
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- DE102010023604A1 DE102010023604A1 DE201010023604 DE102010023604A DE102010023604A1 DE 102010023604 A1 DE102010023604 A1 DE 102010023604A1 DE 201010023604 DE201010023604 DE 201010023604 DE 102010023604 A DE102010023604 A DE 102010023604A DE 102010023604 A1 DE102010023604 A1 DE 102010023604A1
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- polarizers
- light
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- transmitter
- light wave
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- 230000010287 polarization Effects 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 title claims description 13
- 230000004888 barrier function Effects 0.000 title abstract description 11
- 238000004064 recycling Methods 0.000 title description 3
- 238000011156 evaluation Methods 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 4
- 239000011521 glass Substances 0.000 description 9
- 229920003023 plastic Polymers 0.000 description 9
- 239000004033 plastic Substances 0.000 description 7
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000001795 light effect Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- BUHVIAUBTBOHAG-FOYDDCNASA-N (2r,3r,4s,5r)-2-[6-[[2-(3,5-dimethoxyphenyl)-2-(2-methylphenyl)ethyl]amino]purin-9-yl]-5-(hydroxymethyl)oxolane-3,4-diol Chemical compound COC1=CC(OC)=CC(C(CNC=2C=3N=CN(C=3N=CN=2)[C@H]2[C@@H]([C@H](O)[C@@H](CO)O2)O)C=2C(=CC=CC=2)C)=C1 BUHVIAUBTBOHAG-FOYDDCNASA-N 0.000 description 1
- 238000002983 circular dichroism Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine Lichtschranke zur Bestimmung des Werkstoffes eines lichtwellendurchlässigen Gegenstandes nach den Merkmalen des Oberbegriffes von Patentanspruch 1.The invention relates to a light barrier for determining the material of a light-wave transmissive article according to the features of the preamble of claim 1.
Es ist beispielsweise aus der
Bei der Herstellung von Kunststoffgegenständen, beispielsweise Flaschen, ist der Kunststoff in eine Richtung gestreckt oder gezogen; dabei verändern sich dessen optische Eigenschaften in Abhängigkeit von der Schwingungsebene bzw. der Polarisationsrichtung des einfallenden Lichtes.In the manufacture of plastic articles, such as bottles, the plastic is stretched or drawn in one direction; In the process, its optical properties change as a function of the plane of oscillation or the direction of polarization of the incident light.
Es ist bekannt, zur Unterscheidung von transparentem Kunststoff und Glas, diesen Lichteffekt auszunutzen, so dass durch die unterschiedliche Polarisation des Kunststoffmaterials, im Vergleich mit Gegenständen aus Glas, diese Lichteffekte gemessen werden können. Glasgegenstände polarisieren das einfallende Licht nahezu nicht. Insbesondere wenn die Lichtpolarisation um 45° versetzt zu der Streckrichtung des Kunststoffgegenstandes auf diesen auftrifft, kann die Veränderung der Polarisationsrichtung optimal gemessen werden.It is known, to distinguish between transparent plastic and glass, to exploit this light effect, so that these light effects can be measured by the different polarization of the plastic material, compared with glass objects. Glass objects hardly polarize the incident light. In particular, when the polarization of light impinges on the stretching direction of the plastic article by 45 ° to the direction of stretching, the change in the polarization direction can be optimally measured.
Ein Nachteil der bekannten Lichtschranken ist die schwierige Einstellung der Lichtschranke, da der Empfänger auf ein Signalminimum zu justieren ist. Dieses kann jedoch auch dann auftreten, wenn der Lichtstrahl des Senders nicht optimal in die Empfängeroptik eintritt; somit ist eine einfache und nachprüfbare Einstellung des von dem Sender emittierten Lichtstrahles auf den Empfänger nicht möglich.A disadvantage of the known light barriers is the difficult setting of the light barrier, since the receiver is to be adjusted to a signal minimum. However, this can also occur when the light beam of the transmitter does not optimally enter the receiver optics; Thus, a simple and verifiable adjustment of the light beam emitted by the transmitter to the receiver is not possible.
Aus der
Das durch die zitierte Druckschrift offenbarte Messprinzip ist seit über 40 Jahren bekannt, jedoch in Lichtschranken zur Sortierung von Gegenständen aus unterschiedlichen transparenten oder semitransparenten Werkstoffen nicht eingesetzt.The measuring principle disclosed by the cited document has been known for over 40 years, but not used in light barriers for sorting objects made of different transparent or semi-transparent materials.
Es ist daher Aufgabe der Erfindung, eine Lichtschranke der eingangs genannten Gattung derart zu verbessern, dass sowohl unterschiedliche Werkstoffe von lichtwellendurchlässigen Gegenständen erkennbar sind, dass eine Sortierauswahl der unterschiedlich farblich gestalteten Gegenständen, unabhängig, ob diese aus Glas oder Kunststoff gefertigt sind oder welche Lage diese einnehmen, erfolgen kann.It is therefore an object of the invention to improve a light barrier of the type mentioned in such a way that both different materials of lichtwellendurchlässigen objects are recognizable that a sorting selection of differently colored objects, regardless of whether they are made of glass or plastic or which position this take, can take place.
Diese Aufgaben sind erfindungsgemäß durch die Merkmale des kennzeichnenden Teils von Patentanspruch 1 gelöst.These objects are achieved by the features of the characterizing part of claim 1.
Weitere vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.Further advantageous developments of the invention will become apparent from the dependent claims.
Dadurch, dass der Gegenstand die einfallenden und durch diesen hindurchtretenden Lichtwellen, die beispielsweise rechts- oder linkszirkular polarisiert auf diesen auftreffen, teilweise dreht, entstehen zwei sich überlagernde Lichtwellenanteile, so dass durch den nachgeschalteten zweiten Polarisator, der eine entgegen der zirkularen Richtung des ersten Polarisators aufweisende Polarisationsrichtung besitzt, diese Lichtwellenanteile durch diesen Polarisator hindurch laufen und messbar sind. Aufgrund von den bekannten Messergebnissen können dann aus der Lichtstärke der die Polarisation passierenden Lichtes ermittelte Werte mit einer vorgegebenen Messgröße verglichen werden, so dass durch eine Auswerteeinheit feststellbar ist, ob der durch die Polarisatoren geführte Gegenstand aus Glas oder Kunststoff gefertigt ist. Folglich kann mit Hilfe der erfindungsgemäßen Lichtschranke eine zuverlässige Sortierung von Gegenständen, die aus unterschiedlichen Werkstoffen gefertigt sind, lageunabhängig, sortiert werden.Due to the fact that the object partially rotates the incident light waves that pass through it and impinge on it, for example, in a right-handed or left-handed circular polarization, two overlapping light wave components are formed, so that the second polarizer connected downstream of the second polarizer moves against the circular direction of the first polarizer Having polarization direction has, these light wave components through this polarizer run through and are measurable. On the basis of the known measurement results, values determined from the light intensity of the light passing the polarization can then be compared with a predetermined measured variable, so that an evaluation unit determines whether the object guided by the polarizers is made of glass or plastic. Consequently, with the aid of the light barrier according to the invention, a reliable sorting of objects, which are made of different materials, can be sorted independently of position.
In der Zeichnung ist ein erfindungsgemäßes Ausführungsbeispiel dargestellt, das nachfolgend näher erläutert ist. Im Einzelnen zeigt:In the drawing, an inventive embodiment is shown, which is explained in more detail below. In detail shows:
In den
Dem zweiten Polarisator
Insbesondere aus
Durch den zweiten Polarisator
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 2924489 A1 [0002] DE 2924489 A1 [0002]
- CH 444521 [0006] CH 444521 [0006]
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010023604 DE102010023604A1 (en) | 2010-06-12 | 2010-06-12 | Light barrier for use in material recycling industry for determining material of light wave-transmissive object, has polarizers arranged between transmitter and receiver, where polarizers perform circular polarization in opposite directions |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010023604 DE102010023604A1 (en) | 2010-06-12 | 2010-06-12 | Light barrier for use in material recycling industry for determining material of light wave-transmissive object, has polarizers arranged between transmitter and receiver, where polarizers perform circular polarization in opposite directions |
Publications (1)
Publication Number | Publication Date |
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DE102010023604A1 true DE102010023604A1 (en) | 2011-12-15 |
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DE201010023604 Ceased DE102010023604A1 (en) | 2010-06-12 | 2010-06-12 | Light barrier for use in material recycling industry for determining material of light wave-transmissive object, has polarizers arranged between transmitter and receiver, where polarizers perform circular polarization in opposite directions |
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Country | Link |
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DE (1) | DE102010023604A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH444521A (en) | 1965-03-13 | 1967-09-30 | Bodenseewerk Perkin Elmer Co | Device for the simultaneous measurement of optical rotation and circular dichroism |
DE2924489A1 (en) | 1978-06-17 | 1980-01-03 | Minolta Camera Kk | SENSOR DEVICE FOR SHEET-SHAPED MATERIAL |
-
2010
- 2010-06-12 DE DE201010023604 patent/DE102010023604A1/en not_active Ceased
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH444521A (en) | 1965-03-13 | 1967-09-30 | Bodenseewerk Perkin Elmer Co | Device for the simultaneous measurement of optical rotation and circular dichroism |
DE2924489A1 (en) | 1978-06-17 | 1980-01-03 | Minolta Camera Kk | SENSOR DEVICE FOR SHEET-SHAPED MATERIAL |
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Effective date: 20120511 |
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R003 | Refusal decision now final |