DE19839287C2 - Method and device for determining the position of the edge of a metal strip - Google Patents
Method and device for determining the position of the edge of a metal stripInfo
- Publication number
- DE19839287C2 DE19839287C2 DE1998139287 DE19839287A DE19839287C2 DE 19839287 C2 DE19839287 C2 DE 19839287C2 DE 1998139287 DE1998139287 DE 1998139287 DE 19839287 A DE19839287 A DE 19839287A DE 19839287 C2 DE19839287 C2 DE 19839287C2
- Authority
- DE
- Germany
- Prior art keywords
- metal strip
- distance
- edge
- distance sensor
- determining
- 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.)
- Expired - Fee Related
Links
- 239000002184 metal Substances 0.000 title claims description 70
- 238000000034 method Methods 0.000 title claims description 15
- 230000002123 temporal effect Effects 0.000 claims description 2
- 238000011088 calibration curve Methods 0.000 claims 1
- 230000003287 optical effect Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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
- G01B11/028—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by measuring lateral position of a boundary of the object
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/342—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells the sensed object being the obturating part
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/06—Width
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Description
Die Erfindung betrifft ein Verfahren bzw. eine Einrichtung zur Bestimmung der Position der Kante eines Metallbandes.The invention relates to a method and a device to determine the position of the edge of a metal strip.
Derartige Verfahren bzw. Einrichtungen sind z. B. aus der DE 41 26 921 A1 und der DE 34 42 154 A1 bekannt. So ist in der DE 41 26 921 A1 eine induktive Messung der Lage eines Me tallbandes bekannt, wobei auf einer Seite einer Bandkante ei ne von einer Wechselspannung gespeiste Primärspule und auf der anderen Seite der Bandkante eine Sekundärspule angeordnet ist. Aus der durch die Abschirmung durch das Band hervorgeru fenen Kupplungsänderung an der Sekundärspule wird ein die Bandlage wiedergebendes Signal abgeleitet. Gemäß der DE 34 42 154 A1 wird die Bandkante einer Materialbahn mittels eines im Bandkantenbereich angeordneten aus einem Sender und einem Empfänger bestehenden Ultraschall-Detektors gemessen.Such methods or devices are such. B. from the DE 41 26 921 A1 and DE 34 42 154 A1 are known. So is in DE 41 26 921 A1 an inductive measurement of the position of a me tallbandes known, egg on one side of a band edge ne primary coil powered by an alternating voltage and on a secondary spool is arranged on the other side of the strip edge is. Out of the shielded by the tape Open clutch change on the secondary coil is a Band position reproducing signal derived. According to the DE 34 42 154 A1 uses a tape edge of a material web one arranged in the band edge area from a transmitter and an existing ultrasonic detector.
Aufgabe der Erfindung ist es, ein Verfahren bzw. eine Ein richtung zur präziseren und wünschenswerterweise kostengün stigen Bestimmung der Position der Kante eines Metallbandes anzugeben.The object of the invention is a method or a direction for more precise and desirably cost-effective permanent determination of the position of the edge of a metal strip specify.
Die Aufgabe wird erfindungsgemäß durch ein Verfahren gemäß Anspruch 1 oder Anspruch 2 bzw. eine Einrichtung gemäß An spruch 7 oder Anspruch 8 gelöst. Dabei wird zur Bestimmung der Position einer Kante eines gewalzten Metallbandes mittels zumindest eines Abstandssensors zur Messung des Abstands des Abstandssensors von dem Metallband, wobei der Meßbereich des Abstandssensors unvollständig vom Metallband überdeckt ist, aus dem mittels des Abstandssensors gemessenen Abstands und einem Wert des tatsächlichen Abstands des Abstandssensors von dem Metallband der Grad der Überdeckung des Meßbereichs des Abstandssensors durch das Metallband errechnet und daraus die Position der Kante des Metallbandes bestimmt. Alternativ dazu wird zur Bestimmung der Position einer Kante eines gewalzten Metallbandes mittels zumindest zweier Abstandssensoren zur Messung der Abstände der Abstandssensoren von dem Metallband, wobei der Meßbereich eines ersten Abstandssensors unvollstän dig und der Meßbereich eines zweiten Abstandssensors voll ständig vom Metallband überdeckt ist, aus den mittels der Ab standssensoren gemessenen Abständen der Grad der Überdeckung des Meßbereichs des ersten Abstandssensors durch das Metall band errechnet und daraus die Position der Kante des Metall bandes bestimmt.The object is achieved according to the invention by a method Claim 1 or claim 2 or a device according to An claim 7 or claim 8 solved. It becomes a determination the position of an edge of a rolled metal strip by means of at least one distance sensor for measuring the distance of the Distance sensor from the metal strip, the measuring range of Distance sensor is not completely covered by the metal strip, from the distance measured by means of the distance sensor and a value of the actual distance of the distance sensor from the metal band the degree of coverage of the measuring range of the Distance sensor calculated by the metal band and from that the Position of the edge of the metal strip determined. Alternatively is used to determine the position of an edge of a rolled Metal strip by means of at least two distance sensors Measuring the distances of the distance sensors from the metal strip, the measuring range of a first distance sensor is incomplete dig and the measuring range of a second distance sensor full is constantly covered by the metal tape, from which the Ab level sensors measured distances the degree of coverage the measuring range of the first distance sensor through the metal band calculated and from this the position of the edge of the metal bandes determined.
Auf diese Weise ist es möglich, die Position der Kante eines Metallbandes besonders präzise und auf kostengünstige Weise zu bestimmen. In this way it is possible to determine the position of the edge of a Metal strip particularly precise and inexpensive to determine.
In vorteilhafter Ausgestaltung der Erfindung wird die Posi tion der Kante des Metallbandes aus den gemessenen Abständen mehrerer Abstandssensoren, deren Meßbereich vollständig vom Metallband überdeckt ist, bestimmt.In an advantageous embodiment of the invention, the Posi tion of the edge of the metal strip from the measured distances several distance sensors, whose measuring range is completely from Metal band is covered, determined.
In weiterhin vorteilhafter Ausgestaltung der Erfindung wird die Kante des Metallbandes aus zeitlichen Mittelwerten der mittels der Abstandssensoren gemessenen Abstände bestimmt.In a further advantageous embodiment of the invention the edge of the metal strip from temporal averages of the distances measured by means of the distance sensors.
In weiterhin vorteilhafter Ausgestaltung der Erfindung wird die Kante des Metallbandes mittels abgespeicherter Kalibrie rungskurven bestimmt.In a further advantageous embodiment of the invention the edge of the metal strip using stored calibration determined.
In vorteilhafter Ausgestaltung der Erfindung wird die Breite des Metallbandes durch Bestimmung der Positionen beider Kan ten des Metallbandes bestimmt, wobei beide Positionen vonein ander subtrahiert werden.In an advantageous embodiment of the invention, the width of the metal strip by determining the positions of both channels ten of the metal strip, with both positions of one others are subtracted.
Weitere Vorteile und Einzelheiten ergeben sich aus der nach folgenden Beschreibung von Ausführungsbeispielen und aus den Unteransprüchen. Im einzelnen zeigen:Further advantages and details emerge from the following description of exemplary embodiments and from the Subclaims. In detail show:
Fig. 1 ein Ausführungsbeispiel für die Erfindung, Fig. 1 shows an embodiment of the invention,
Fig. 2 ein Beispiel für einen Zusammenhang zwischen Aus gangsspannung eines Abstandssensors und dessen Überdeckungsgrad durch das Metallband, Fig. 2 shows an example of a relationship between output voltage from a distance sensor and the degree of overlap of the metal strip,
Fig. 3 eine Kennlinie für verschiedene Abstände. Fig. 3 shows a characteristic curve for different distances.
Fig. 1 zeigt ein Ausführungsbeispiel der Erfindung. Dabei be zeichnet Bezugszeichen 1 ein Metallband. Dieses Metallband ist im Querschnitt dargestellt. Es sind Abstandssensoren 2, 3, 4, 5, 6, 7 und 8 vorgesehen. Die Abstandssensoren 2, 3, 4, 5, 6, 7 und 8 haben bestimmte Meßbereiche 9, 10, 11, 12, 13, 14, 15 zur Messung ihres Abstandes vom Metallband 1. Der Meß bereich 9 des Abstandssensors 2 wird jedoch nicht vollständig vom Metallband 1 abgedeckt. Er liefert deshalb verfälschte Meßwerte. Fig. 1 shows an embodiment of the invention. Reference numeral 1 denotes a metal strip. This metal strip is shown in cross section. Distance sensors 2 , 3 , 4 , 5 , 6 , 7 and 8 are provided. The distance sensors 2 , 3 , 4 , 5 , 6 , 7 and 8 have certain measuring ranges 9 , 10 , 11 , 12 , 13 , 14 , 15 for measuring their distance from the metal strip 1 . The measuring area 9 of the distance sensor 2 is not completely covered by the metal strip 1 . It therefore supplies falsified measured values.
Das Ausmaß einer solchen Meßwertverfälschung ist beispielhaft in Fig. 2 dargestellt, wobei die Ausgangsspannung U eines Ab standssensors bei einem festen Abstand h über dessen Position P in bezug auf das Metallband 1 dargestellt ist. In Fig. 2 sind drei Bereiche 30, 31, 32 dargestellt. Im Bereich 30 ist der Abstandssensor, der etwa einen Gesamtmeßbereich von 20 mm abdeckt, nicht durch das Metallband 1 abgedeckt. Im Bereich 31 ist der Abstandssensor teilweise von dem Metallband 1 ab gedeckt. Im Bereich 32 ist der Abstandssensor vollständig vom Metallband 1 abgedeckt.The extent of such a measurement falsification is shown by way of example in FIG. 2, the output voltage U of a position sensor being shown at a fixed distance h above its position P with respect to the metal strip 1 . Two areas 30 , 31 , 32 are shown in FIG . In the area 30 , the distance sensor, which covers approximately a total measuring area of 20 mm, is not covered by the metal strip 1 . In the area 31 , the distance sensor is partially covered by the metal strip 1 . In area 32 , the distance sensor is completely covered by metal strip 1 .
Der Abstand h zwischen den Abstandssensoren 2, 3, 4, 5, 6, 7 und 8 und dem Metallband 1 wird zur Berechnung der Überdec kung des Metallbandes 1 z. B. einer Recheneinrichtung eingege ben, mittels der die Bestimmung der Überdeckung des Metall bandes 1 durch den Meßbereich 9 des Abstandssensors 2 berech net wird. Vorteilhaft ist es jedoch, diesen Abstand online zu bestimmen. Dazu wird der zeitliche Mittelwert der Aus gangssignale der Abstandssensoren 3, 4, 5, 6, 7, die voll ständig vom Metallband 1 überdeckt sind, gebildet. Aus diesem Gleichanteil wird der Abstand der Abstandssensoren 2, 3, 4, 5, 6, 7 und 8 von dem Metallband 1 bestimmt.The distance h between the distance sensors 2 , 3 , 4 , 5 , 6 , 7 and 8 and the metal strip 1 is used to calculate the overdec tion of the metal strip 1 z. B. a computing device, by means of which the determination of the coverage of the metal strip 1 by the measuring range 9 of the distance sensor 2 is calculated. However, it is advantageous to determine this distance online. For this purpose, the time average of the output signals from the distance sensors 3 , 4 , 5 , 6 , 7 , which are covered continuously by the metal strip 1 , is formed. The distance between the distance sensors 2 , 3 , 4 , 5 , 6 , 7 and 8 from the metal strip 1 is determined from this direct component.
Die Kennlinie in Fig. 2 ist nur für einen definierten Abstand h gültig. Um für beliebige Abstände eine Kennlinie zu erhal ten und gleichzeitig den Aufwand bei der Kalibrierung gering zu halten, wird folgendes Verfahren angewandt (siehe Fig. 3): Für zwei Abstände h1 und h2 werden jeweils ca. 10 Meßpunkte, in Fig. 3 dargestellt durch Kreuze (von denen eines exempla risch mit Bezugszeichen 33 bezeichnet ist), bei verschiedenen Bandkantenpositionen P abgespeichert. Für einen beliebigen Wert h, für den h1 < h < h2 gilt, können die entsprechenden 10 Meßpunkte durch lineare Interpolation berechnet werden. Die Stützstellen, die durch lineare Interpolation ermittelt wer den, sind in Fig. 3 durch Kreise dargestellt, von denen einer exemplarisch mit Bezugszeichen 37 bezeichnet ist.The characteristic curve in FIG. 2 is only valid for a defined distance h. In order to obtain a characteristic curve for any distances and at the same time to keep the calibration effort low, the following method is used (see FIG. 3): For two distances h 1 and h 2 , approx. 10 measuring points each, in FIG. 3 represented by crosses (one of which is exemplarily designated by reference number 33 ), stored at different strip edge positions P. For any value h, for which h 1 <h <h 2 applies, the corresponding 10 measuring points can be calculated by linear interpolation. The interpolation points, which are determined by linear interpolation, are represented in FIG. 3 by circles, one of which is designated by way of example with reference number 37 .
Anschließend wird durch die 10 Kalibrierwerte eine passende Funktion 36 gefittet (least-square-fit). Als Fit-Funktion kommt vorteilhafterweise die Fermi-Verteilung in Frage.A suitable function 36 is then fitted using the 10 calibration values (least-square-fit). The Fermi distribution is advantageously a suitable fit function.
Dabei ist U die Ausgangsspannung des Abstandssensors, P ist die horizontale Bandkantenposition und a0, a1, a2, a3 sind Fitparameter, die durch den Fitalgorithmus bestimmt werden.U is the output voltage of the distance sensor, P is the horizontal band edge position and a 0 , a 1 , a 2 , a 3 are fit parameters that are determined by the fit algorithm.
Bezugszeichen 34 und 35 bezeichnen die entsprechenden Kurven für h2 und h1.Reference numerals 34 and 35 denote the corresponding curves for h 2 and h 1 .
Zum Bestimmen der Bandkante wird die Abstandssensorspannung U
gemessen und daraus die Bandkantenposition berechnet. Dazu
wird die Umkehrfunktion obiger Formel gebildet:
To determine the strip edge, the distance sensor voltage U is measured and the strip edge position is calculated therefrom. To do this, the inverse function of the above formula is formed:
Soll die Bandkante über einen weiten Bereich bestimmt werden,
so werden mehrere Abstandssensoren dicht nebeneinander ge
setzt wie in Fig. 1 gezeigt. Zur Auswertung der Bandkante wird
der Abstandssensor herangezogen, der nur teilweise bedeckt
ist. Das ist der Abstandssensor, für den der Ausdruck
If the band edge is to be determined over a wide range, a plurality of distance sensors are placed close together as shown in FIG. 1. The distance sensor, which is only partially covered, is used to evaluate the strip edge. This is the distance sensor for which the expression
minimal ist.is minimal.
Umax ist dabei die Ausgangsspannung eines unbedeckten Ab standssensors und Umin die Ausgangsspannung eines vollständig bedeckten Abstandssensors. Oben bezeichnete Berechnungen wer den vorteilhafterweise mittels einer nicht dargestellten Re cheneinrichtung durchgeführt. U max is the output voltage of an uncovered distance sensor and U min the output voltage of a fully covered distance sensor. The above-mentioned calculations are carried out advantageously by means of a computing device (not shown).
Auf diese Weise ist es möglich, einen sehr genauen Wert für die Position der Bandkante des Metallbandes 1 zu erhalten. Dieser kann vorteilhafterweise für die weitere Steuerung der Walzstraße verwendet werden.In this way it is possible to obtain a very precise value for the position of the band edge of the metal band 1 . This can advantageously be used for the further control of the rolling mill.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998139287 DE19839287C5 (en) | 1998-08-28 | 1998-08-28 | Method and device for determining the position of the edge of a metal strip |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998139287 DE19839287C5 (en) | 1998-08-28 | 1998-08-28 | Method and device for determining the position of the edge of a metal strip |
Publications (3)
Publication Number | Publication Date |
---|---|
DE19839287A1 DE19839287A1 (en) | 1999-10-07 |
DE19839287C2 true DE19839287C2 (en) | 2000-02-17 |
DE19839287C5 DE19839287C5 (en) | 2008-02-14 |
Family
ID=7879084
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1998139287 Expired - Fee Related DE19839287C5 (en) | 1998-08-28 | 1998-08-28 | Method and device for determining the position of the edge of a metal strip |
Country Status (1)
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DE (1) | DE19839287C5 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202016008273U1 (en) | 2016-02-08 | 2017-06-09 | Asinco GmbH | Device for measuring the width of a metal strip produced by strip rolling |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3442154A1 (en) * | 1984-11-17 | 1986-05-28 | Elektro-Mechanik Gmbh, 5963 Wenden | METHOD FOR DETECTING THE POSITION OF THE STRIP EDGE OF A MATERIAL RAIL |
DE4126921A1 (en) * | 1991-08-14 | 1993-02-18 | Elmeg | METHOD AND DEVICE FOR INDUCTIVE MEASUREMENT OF THE POSITION OF A METAL STRIP |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE451886B (en) * | 1986-10-10 | 1987-11-02 | Sten Linder | SET AND DEVICE FOR SOUND-FREE SEAT OF SIZES OF OR CONNECTED TO ELECTRICALLY CONDUCTIVE MATERIAL |
SE468405B (en) * | 1991-05-02 | 1993-01-11 | Asea Brown Boveri | METHOD OF DETERMINATION OF METALLIC MATERIALS AND EDGE METERS FOR IMPLEMENTATION OF THE PROCEDURE |
-
1998
- 1998-08-28 DE DE1998139287 patent/DE19839287C5/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3442154A1 (en) * | 1984-11-17 | 1986-05-28 | Elektro-Mechanik Gmbh, 5963 Wenden | METHOD FOR DETECTING THE POSITION OF THE STRIP EDGE OF A MATERIAL RAIL |
DE4126921A1 (en) * | 1991-08-14 | 1993-02-18 | Elmeg | METHOD AND DEVICE FOR INDUCTIVE MEASUREMENT OF THE POSITION OF A METAL STRIP |
Also Published As
Publication number | Publication date |
---|---|
DE19839287C5 (en) | 2008-02-14 |
DE19839287A1 (en) | 1999-10-07 |
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Effective date: 20140301 |