DE102009027424A1 - Optical thickness sensor calibrating method for contactless determination of thickness of e.g. paper web, involves compressing material web against upper and lower sensor plates by air cushions, where plates are provided on side of web - Google Patents
Optical thickness sensor calibrating method for contactless determination of thickness of e.g. paper web, involves compressing material web against upper and lower sensor plates by air cushions, where plates are provided on side of web Download PDFInfo
- Publication number
- DE102009027424A1 DE102009027424A1 DE200910027424 DE102009027424A DE102009027424A1 DE 102009027424 A1 DE102009027424 A1 DE 102009027424A1 DE 200910027424 DE200910027424 DE 200910027424 DE 102009027424 A DE102009027424 A DE 102009027424A DE 102009027424 A1 DE102009027424 A1 DE 102009027424A1
- Authority
- DE
- Germany
- Prior art keywords
- web
- sensor
- material web
- plates
- air cushion
- 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.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/06—Indicating or regulating the thickness of the layer; Signal devices
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Kalibrieren eines optischen Dickensensors zur berührungslosen Bestimmung der Dicke einer Materialbahn, insbesondere Faserstoffbahn, der zumindest zwei Sensorplatten umfasst, zwischen denen die Materialbahn hindurch führbar ist, wobei zwischen jeder Sensorplatte und der Materialbahn jeweils ein Luftkissen erzeugbar ist.The The invention relates to a method for calibrating an optical Thickness sensor for non-contact determination of the thickness a material web, in particular fibrous web, the at least two Sensor plates comprises, between which the material web passes is feasible, wherein between each sensor plate and the Material web each an air cushion can be generated.
Optische
Dickensensoren zur berührungslosen Bestimmung der Dicke
einer Materialbahn, insbesondere Faserstoffbahn, sind aus den Druckschriften
Bei der Kalibrierung der optischen Kanäle eines solchen berührungslosen optischen Dickensensors auf eine bestimmte Papiersorte wird das Luftkissen durch Druckänderung an einer laufenden Papierbahn, die beispielsweise mit einer Geschwindigkeit im Bereich von 10 m/min bewegt wird, in einem bestimmten Bereich verändert und mit dem gleichzeitig magnetisch gemessenen Sensorplattenabstand korreliert. Dies wird für beide Seiten separat durchgeführt. Durch die unterschiedlichen Drücke wird die Papierbahn jedoch verformt, wodurch die optische gemessenen Werte verfälscht werden.at the calibration of the optical channels of such a non-contact optical thickness sensor on a particular paper type is the Air cushion by changing the pressure on a moving paper web, for example, at a speed in the range of 10 m / min is moved, changed in a certain area and with the magnetically measured sensor plate distance correlated. This is done separately for both sides. Due to the different pressures, the paper web however deformed, which falsifies the optical measured values become.
So
ist beispielsweise anhand der
Der Erfindung liegt die Aufgabe zugrunde, ein verbessertes Verfahren der eingangs genannten Art anzugeben, bei dem dieser Effekt kompensiert wird.Of the Invention is based on the object, an improved method specify the type mentioned above, in which this effect is compensated.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass zum Kalibrieren des optischen Dickensensors auf eine jeweilige Materialbahn getrennt für beide Materialbahnseiten das jeweilige Luftkissen durch Druckänderung an der Materialbahn in einem bestimmten Bereich verändert und mit dem gleichzeitig gemessenen Sensorplattenabstand korreliert wird, wobei während einer jeweiligen Änderung des Luftkissens auf einer Seite der Materialbahn das Luftkissen auf der anderen Seite der Materialbahn abgeschaltet wird, so dass die Materialbahn durch das noch existierende Luftkissen insbesondere flach gegen die auf der anderen Seite der Materialbahn vorgesehene Sensorplatte gedrückt wird.According to the invention this object is achieved by calibrating the optical thickness sensor to a respective web separated for Both material web pages the respective air cushion by pressure change changed at the web in a certain area and correlated with the simultaneously measured sensor plate distance, wherein during a respective change of the air cushion on one side of the web the air cushion on the other Side of the web is turned off, leaving the web especially flat against the still existing air cushion the provided on the other side of the web sensor plate is pressed.
Indem auf jeweils einer Seite das Luftkissen abgeschaltet wird, so dass die Materialbahn durch das noch existierende Luftkissen flach gegen die auf der anderen Seite der Materialbahn vorgesehene Sensorplatte gedrückt wird, bleibt die Materialbahn flach, und die erhaltenen Messwerte geben genau den Abstand zwischen der Materialbahn und der einen Sensorplatte wieder.By doing on each side of the air cushion is turned off, so that flat the material web through the still existing air cushion the provided on the other side of the web sensor plate is pressed, the web remains flat, and the obtained Measurements give exactly the distance between the web and the one sensor plate again.
Die Kalibrierung des optischen Dickensensors erfolgt bevorzugt bei laufender Materialbahn.The Calibration of the optical thickness sensor is preferably carried out while running Web.
Dabei kann die Materialbahn beispielsweise mit einer Geschwindigkeit im Bereich von 10 m/min bewegt werden, wodurch der Materialabtrag auf den Sensorplatten minimiert wird.there For example, the web can be at a speed in the Range of 10 m / min to be moved, causing the material removal on the sensor plates is minimized.
Bevorzugt wird der Sensorplattenabstand magnetisch gemessen.Prefers the sensor plate distance is measured magnetically.
Der
optische Sensor zur berührungslosen Bestimmung der Materialbahn
kann insbesondere so ausgeführt sein, wie dies in der
So
ist aus der
In
der
Die Erfindung wird im folgenden unter Bezugnahme auf die Zeichnung näher erläutert; in dieser zeigen:The Invention will become more apparent hereinafter with reference to the drawings explains; in this show:
In
der
Der
optische Dickensensor umfasst zumindest zwei Sensorplatten
Zum
Kalibrieren des optischen Dickensensors auf eine jeweilige Materialbahn
Dabei
wird während einer jeweiligen Änderung des Luftkissens
Im
vorliegenden Fall ist das untere Luftkissen
Die
Kalibrierung des optischen Dickensensors kann insbesondere bei laufender
Materialbahn
Dabei
kann die Materialbahn
Der Sensorplattenabstand wird bevorzugt magnetisch gemessen.Of the Sensor plate spacing is preferably measured magnetically.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 1010
- obere Sensorplatteupper sensor plate
- 1212
- untere Sensorplattelower sensor plate
- 1414
- Papierbahnpaper web
- 1616
- oberes Luftkissenupper air cushion
- 1818
- unteres Luftkissenlower air cushion
- 2020
- Materialbahnweb
- 2222
- obere Sensorplatteupper sensor plate
- 2424
- untere Sensorplattelower sensor plate
- 2626
- oberes Luftkissenupper air cushion
- 2828
- unteres Luftkissenlower air cushion
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES 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 The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - EP 1855082 A1 [0002, 0011, 0012] EP 1855082 A1 [0002, 0011, 0012]
- - EP 1855083 A1 [0002, 0011, 0013] - EP 1855083 A1 [0002, 0011, 0013]
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910027424 DE102009027424A1 (en) | 2009-07-02 | 2009-07-02 | Optical thickness sensor calibrating method for contactless determination of thickness of e.g. paper web, involves compressing material web against upper and lower sensor plates by air cushions, where plates are provided on side of web |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910027424 DE102009027424A1 (en) | 2009-07-02 | 2009-07-02 | Optical thickness sensor calibrating method for contactless determination of thickness of e.g. paper web, involves compressing material web against upper and lower sensor plates by air cushions, where plates are provided on side of web |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102009027424A1 true DE102009027424A1 (en) | 2011-01-05 |
Family
ID=43298874
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200910027424 Withdrawn DE102009027424A1 (en) | 2009-07-02 | 2009-07-02 | Optical thickness sensor calibrating method for contactless determination of thickness of e.g. paper web, involves compressing material web against upper and lower sensor plates by air cushions, where plates are provided on side of web |
Country Status (1)
Country | Link |
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DE (1) | DE102009027424A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1855083A1 (en) | 2006-05-12 | 2007-11-14 | Voith Patent GmbH | Device and method for optical distance measurement |
EP1855082A1 (en) | 2006-05-12 | 2007-11-14 | Voith Patent GmbH | Device and method for optical distance measurement |
-
2009
- 2009-07-02 DE DE200910027424 patent/DE102009027424A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1855083A1 (en) | 2006-05-12 | 2007-11-14 | Voith Patent GmbH | Device and method for optical distance measurement |
EP1855082A1 (en) | 2006-05-12 | 2007-11-14 | Voith Patent GmbH | Device and method for optical distance measurement |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20130201 |