EP0201576B2 - Method for detecting the position of the band edge of a material sheet - Google Patents
Method for detecting the position of the band edge of a material sheet Download PDFInfo
- Publication number
- EP0201576B2 EP0201576B2 EP85905810A EP85905810A EP0201576B2 EP 0201576 B2 EP0201576 B2 EP 0201576B2 EP 85905810 A EP85905810 A EP 85905810A EP 85905810 A EP85905810 A EP 85905810A EP 0201576 B2 EP0201576 B2 EP 0201576B2
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- Prior art keywords
- receiver
- transmitter
- instant
- packet
- time span
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- 239000000463 material Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000010355 oscillation Effects 0.000 claims description 13
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims 2
- 238000005259 measurement Methods 0.000 abstract description 10
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000002604 ultrasonography Methods 0.000 abstract description 5
- 238000005070 sampling Methods 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009365 direct transmission Effects 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
- B65H23/0204—Sensing transverse register of web
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S367/00—Communications, electrical: acoustic wave systems and devices
- Y10S367/902—Speed of sound compensation
Definitions
- the invention relates to a method for detecting the position of the strip edge of a material web by means of an ultrasound detector arranged in the strip edge region and consisting of a transmitter and a receiver, the transmitter emitting individual pulses or wave packets consisting of individual pulses at a predetermined first time and the receiver emitting the individual pulse or that Wave packet receives and converted into an electrical signal or vibration packet.
- the object of the invention is to further develop the above-mentioned and initially defined method for position detection of a strip edge in such a way that undesired reflecting waves certainly do not have any influence on the measurement result.
- the object is achieved in that a predetermined sampling time period for the individual pulses received or the oscillation packet begins at a second point in time, which is after the first point in time by a period of time that is approximately equal to the transit time of the sound waves between the transmitter and the receiver individual pulses received in the sampling period or the oscillation packet are stored at a later point in time, the period between the end of the sampling period and the first point in time being shorter than a period which requires a reflection signal which originates from a signal which is emitted by the transmitter at the first point in time was emitted and reached the receiver via a detour, and that the pause time until the next individual pulse or wave packet was emitted is so long that the reflection interference signals of the previous individual pulse or wave packet have decayed.
- the peak value that is determined in the sampling period of the oscillation range can be used particularly advantageously as the sample value.
- the method thus works in such a way that a wave packet is first emitted by the ultrasound transmitter and received by the receiver, and converted into an electrical oscillation packet signal, and this when the scanning is not activated. Instead of a wave packet, individual pulses can also be used. Since the undesired reflection rays only reach the receiver at a later point in time, by evaluating or scanning the first area of the oscillation packet, in which no undesired superimpositions yet occur, a measured value can be obtained that represents the position of the band edge with great accuracy. If you limit the scanning range to a maximum of three to five periods, calculated from the beginning of the oscillation packet, the interference reflections will certainly be eliminated. The whole process is repeated cyclically and thus enables continuous monitoring or monitoring of the material web.
- One arrangement for carrying out the method is that the transmitter is fed by a pulse train generator, that an activatable peak rectifier is connected to the receiver that emits an electrical signal, and that an activatable transmission circuit is connected downstream for transmitting the peak value to a memory.
- a sequence control is provided which is acted upon by a pulse generator.
- the same pulses are also fed to the pulse train generator.
- the sequence control then ensures that a predetermined pulse sequence is sent out by the generator and the peak value rectifier is activated at a specific point in time for a specific sampling period, the peak value determined subsequently being fed to a memory via a transmission circuit.
- the measurement can take place both in reflection and in the direct transmission method.
- the transmitter and receiver are arranged on the same side of the material web at a certain angle, the beam reflected on the material web forming the measuring beam.
- an ultrasonic transducer can be used alternately as a transmitter and receiver in a known manner.
- the transmitter is on one side and the receiver on the other side of the material web, with sound waves of different energy reaching the receiver depending on the degree of coverage of the beam by the web.
- Fig. 1, 1 schematically indicates the material web which is guided over rollers, not shown.
- the transmitter 2 is located above the material web, while the receiver 3 is arranged below the material web.
- the transmitter and receiver are arranged in the edge area of the material web, so that the sound beam is partially covered by the material web. Depending on the degree of coverage, more or less sound energy reaches the receiver, which represents a measure of the position of the band edge or the material web.
- the reflection method not shown, can also be used.
- the transmitter and receiver are arranged at a suitable angle on one side of the material web.
- the sound beam emitted by the transmitter is reflected on the material web and then reaches the receiver.
- rays reflected at other points also enter the receiver, which amplify or weaken the measuring beam and thus lead to a falsification of the measurement result.
- the ultrasound transmitter 2 is fed by a pulse sequence generator 4, which emits a specific pulse sequence of a predetermined sequence frequency.
- a pulse generator is used instead of the pulse train generator 4.
- This electrical pulse sequence is converted in the transmitter into a sound wave packet, emitted and received as a sound wave packet by the receiver, the energy received being determined by the degree of coverage of the beam by the material web.
- the sound waves are converted directly into electrical signals in the receiver, possibly amplified in an amplifier 5 and then fed to an activatable scanning device 6.
- the scanning device 6 has a switch 7 which supplies the signals emitted by the amplifier 5 to the peak value rectifier 8.
- the peak value rectifier 8 consists, for example, of the interconnection of a diode with a capacitor, as is shown symbolically. After the end of the sampling period, the switch 7 is opened and the value held in the peak value rectifier is fed to a memory by means of a transmission circuit 9.
- the transition circuit 9 can consist, for example, of a switch 11 and a capacitor 10. By closing the switch 11, the charge is transferred from the peak value rectifier to the capacitor 10 and then fed via line 15 to a memory, not shown, for further processing.
- the sequence control is acted upon by a pulse generator 13, which simultaneously delivers pulses to the pulse train generator 4.
- the sequence control closes the switch 14 and activates the pulse train generator, which for example emits a pulse train with three pulses.
- the transmitter 2 emits a wave packet with the same period.
- the switch 14 is opened and the switch 7 is closed via the sequence control 12.
- the time difference T2-T1 corresponds approximately to the transit time of the sound waves from the transmitter to the receiver.
- the switch 7 remains closed so long that approximately three periods are detected by the scanning circuit 6.
- switch 7 opens and the peak value rectifier maintains the peak value that occurs in the time range T3-T2.
- switch 11 is closed and the peak value is transferred to a memory 10.
- the peak rectifier is then reset to zero and the cycle begins again. This ensures that only the measurement signal is recorded during the sampling period and that no disturbing reflections that would occur at a later point in time influence the measurement value.
Landscapes
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Geophysics And Detection Of Objects (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zur Positionserfassung der Bandkante einer Materialbahn mittels eines im Bandkantenbereich angeordneten, aus einem Sender und einem Empfänger bestehenden Ultraschalldetektors, wobei der Sender Einzelimpulse oder aus Einzelimpulsen bestehende Wellenpakete zu einem vorgegebenen ersten Zeitpunkt abstrahlt und der Empfänger den Einzelimpuls oder das Wellenpaket empfängt und in ein elektrisches Signal oder Schwingungspaket umwandelt.The invention relates to a method for detecting the position of the strip edge of a material web by means of an ultrasound detector arranged in the strip edge region and consisting of a transmitter and a receiver, the transmitter emitting individual pulses or wave packets consisting of individual pulses at a predetermined first time and the receiver emitting the individual pulse or that Wave packet receives and converted into an electrical signal or vibration packet.
Ein derartiges Verfahren ist aus der US-A-3 342 284 bekannt. Bei den bekannten Ultraschalldetektoren treten jedoch wesentliche Verfälschungen des Messsignals dadurch auf, dass der Empfänger nicht nur den Messstrahl empfängt, sondern auch reflektierende Strahlen, die nicht zum direkten Strahlengang gehören. Insbesondere wenn aufgrund der Höhenschwankungen des Bandes zwischen dem Empfänger und Sender die Reflexionssignale in ein harmonisches Verhältnis zur Wellenlänge des abgestrahlten Schalls gelangen, addieren oder subtrahieren sich diese Reflexionssignale je nach ihren Phasenlagen zu dem direkten Messsignal und führen damit zu einem verfälschten Messwert.Such a method is known from US-A-3,342,284. In the known ultrasonic detectors, however, significant falsifications of the measurement signal occur in that the receiver not only receives the measurement beam, but also reflecting beams that do not belong to the direct beam path. In particular if, due to the height fluctuations of the band between the receiver and transmitter, the reflection signals come into harmonic relationship with the wavelength of the emitted sound, these reflection signals add or subtract depending on their phase positions to the direct measurement signal and thus lead to a falsified measurement value.
Der Erfindung liegt die Aufgabe zugrunde, das vorgenannte und eingangs definierte Verfahren zur Positionserfassung einer Bandkante dahingehend weiterzubilden, dass unerwünschte reflektierende Wellen mit Sicherheit keinen Einfluss auf das Messergebnis nehmen.The object of the invention is to further develop the above-mentioned and initially defined method for position detection of a strip edge in such a way that undesired reflecting waves certainly do not have any influence on the measurement result.
Die Aufgabe wird erfindungsgemäss dadurch gelöst, dass eine vorgegebene Abtastzeitspanne für die empfangenen Einzelimpulse oder das Schwingungspaket zu einem zweiten Zeitpunkt beginnt, der um eine Zeitspanne, die ungefähr gleich der Laufzeit der Schallwellen zwischen Sender und Empfänger ist, nach dem ersten Zeitpunkt liegt, dass die in der Abtastzeitspanne empfangenen Einzelimpulse oder das Schwingungspaket zu einem späteren Zeitpunkt gespeichert werden, wobei die Zeitspanne zwischen dem Ende der Abtastzeitspanne und dem ersten Zeitpunkt kürzer ist als eine Zeitspanne, die ein Reflexionssignal benötigt, das von einem Signal stammt, das vom Sender im ersten Zeitpunkt abgegeben wurde und über einen Umweg auf den Empfänger gelangt, und dass die Pausenzeit bis zur Abstrahlung des nächsten Einzelimpulses oder Wellenpaketes so gross ist, dass die Reflexionsstörsignale des vorhergehenden Einzelimpulses oder Wellenpaketes abgeklungen sind.According to the invention, the object is achieved in that a predetermined sampling time period for the individual pulses received or the oscillation packet begins at a second point in time, which is after the first point in time by a period of time that is approximately equal to the transit time of the sound waves between the transmitter and the receiver individual pulses received in the sampling period or the oscillation packet are stored at a later point in time, the period between the end of the sampling period and the first point in time being shorter than a period which requires a reflection signal which originates from a signal which is emitted by the transmitter at the first point in time was emitted and reached the receiver via a detour, and that the pause time until the next individual pulse or wave packet was emitted is so long that the reflection interference signals of the previous individual pulse or wave packet have decayed.
Als Abtastwert lässt sich besonders vorteilhaft der Spitzenwert verwenden, der in der Abtastperiode des Schwingungsbereichs ermittelt wird. Bei dem Verfahren wird also so gearbeitet, dass zunächst - und zwar bei nicht aktivierter Abtastung - ein Wellenpaket vom Ultraschallsender ausgestrahlt und vom Empfänger empfangen und in ein elektrisches Schwingungspaket-Signal umgewandelt wird. Anstelle eines Wellenpakets kann auch mit Einzelimpulsen gearbeitet werden. Da die unerwünschten Reflexionsstrahlen erst zu einem späteren Zeitpunkt in den Empfänger gelangen, kann man durch Auswertung bzw. Abtasten des ersten Bereichs des Schwingungspakets, in dem noch keine unerwünschten Überlagerungen auftreten, einen Messwert gewinnen, der die Lage der Bandkante mit grosser Genauigkeit repräsentiert. Begrenzt man den Abtastbereich, und zwar von Beginn des Schwingungspakets an gerechnet, auf höchstens drei bis fünf Perioden, so bleiben die Störreflexe mit Sicherheit eliminiert. Der ganze Vorgang wiederholt sich zyklisch und ermöglicht so eine fortlaufende Kontrolle bzw. Überwachung der Materialbahn.The peak value that is determined in the sampling period of the oscillation range can be used particularly advantageously as the sample value. The method thus works in such a way that a wave packet is first emitted by the ultrasound transmitter and received by the receiver, and converted into an electrical oscillation packet signal, and this when the scanning is not activated. Instead of a wave packet, individual pulses can also be used. Since the undesired reflection rays only reach the receiver at a later point in time, by evaluating or scanning the first area of the oscillation packet, in which no undesired superimpositions yet occur, a measured value can be obtained that represents the position of the band edge with great accuracy. If you limit the scanning range to a maximum of three to five periods, calculated from the beginning of the oscillation packet, the interference reflections will certainly be eliminated. The whole process is repeated cyclically and thus enables continuous monitoring or monitoring of the material web.
Eine Anordnung zur Durchführung des Verfahrens besteht darin, dass der Sender von einem Impulsfolgegenerator gespeist wird, dass dem ein elektrisches Signal abgebenden Empfänger ein aktivierbarer Spitzengleichrichter und diesem eine aktivierbare Übertragungsschaltung zur Übertragung des Spitzenwertes auf einen Speicher nachgeschaltet ist.One arrangement for carrying out the method is that the transmitter is fed by a pulse train generator, that an activatable peak rectifier is connected to the receiver that emits an electrical signal, and that an activatable transmission circuit is connected downstream for transmitting the peak value to a memory.
Um das Verfahren in einem vorgegebenen Zeitlauf zu steuern, ist eine Ablaufsteuerung vorgesehen, die von einem Impulsgenerator beaufschlagt wird. Die gleichen Impulse werden auch dem Impulsfolgegenerator zugeführt. Die Ablaufsteuerung sorgt dann dafür, dass eine vorgegebene Impulsfolge von dem Generator ausgesandt und der Spitzenwertgleichrichter zu einem bestimmten Zeitpunkt für eine bestimmte Abtastperiode aktiviert wird, wobei der ermittelte Spitzenwert anschliessend über eine Übertragungsschaltung einem Speicher zugeführt wird.In order to control the method in a predetermined time sequence, a sequence control is provided which is acted upon by a pulse generator. The same pulses are also fed to the pulse train generator. The sequence control then ensures that a predetermined pulse sequence is sent out by the generator and the peak value rectifier is activated at a specific point in time for a specific sampling period, the peak value determined subsequently being fed to a memory via a transmission circuit.
Die Messung kann sowohl in Reflexion als auch im direkten Durchstrahlverfahren erfolgen. Im ersten Fall sind Sender und Empfänger auf der gleichen Seite der Materialbahn unter bestimmtem Winkel angeordnet, wobei der an der Materialbahn reflektierte Strahl den Messstrahl bildet. Alternativ dazu kann in bekannter Weise ein Ultraschall-Wandler wechselweise als Sender und Empfänger verwendet werden. Im Falle der Durchstrahlmethode befindet sich der Sender auf der einen Seite und der Empfänger auf der anderen Seite der Materialbahn, wobei je nach dem Abdeckungsgrad des Strahls durch die Bahn Schallwellen unterschiedlicher Energie in den Empfänger gelangen.The measurement can take place both in reflection and in the direct transmission method. In the first case, the transmitter and receiver are arranged on the same side of the material web at a certain angle, the beam reflected on the material web forming the measuring beam. Alternatively, an ultrasonic transducer can be used alternately as a transmitter and receiver in a known manner. In the case of the transmission method, the transmitter is on one side and the receiver on the other side of the material web, with sound waves of different energy reaching the receiver depending on the degree of coverage of the beam by the web.
Das Wesen der Erfindung soll an einem in den Zeichnungen dargestellten Ausführungsbeispiel näher erläutert werden. Es zeigen:
- Fig. 1 die allgemeine Messanordnung mit einem Ultraschalldetektor,
- Fig. 2 die schematische Darstellung einer Anordnung zur Durchführung des Verfahrens gemäss der Erfindung und
- Fig. 3 ein Ablaufdiagramm zur Erläuterung des Verfahrensablaufs.
- 1 shows the general measuring arrangement with an ultrasound detector,
- Fig. 2 is a schematic representation of an arrangement for performing the method according to the invention and
- Fig. 3 is a flow chart to explain the process flow.
In Fig. 1 ist mit 1 schematisch die Materialbahn angedeutet, die über nicht dargestellte Rollen geführt wird. Oberhalb der Materialbahn befindet sich der Sender 2, während unterhalb der Materialbahn der Empfänger 3 angeordnet ist. Sender und Empfänger sind im Kantenbereich der Materialbahn angeordnet, so dass der Schallstrahl teilweise von der Materialbahn abgedeckt wird. Je nach dem Abdeckungsgrad gelangt mehr oder weniger Schallenergie in den Empfänger, die ein Mass für die Lage der Bandkante bzw. der Materialbahn repräsentiert. Anstelle des Durchstrahlverfahrens kann auch das nicht dargestellte Reflexionsverfahren angewendet werden. In diesem Fall sind Sender und Empfänger unter geeignetem Winkel auf der einen Seite der Materialbahn angeordnet. Der vom Sender abgegebene Schallstrahl wird auf der Materialbahn reflektiert und gelangt danach in den Empfänger. Wie bereits erwähnt, treten jedoch auch an anderer Stelle reflektierte Strahlen zusätzlich in den Empfänger ein, die den Messstrahl verstärken oder schwächen und somit zu einer Verfälschung des Messergebnisses führen.In Fig. 1, 1 schematically indicates the material web which is guided over rollers, not shown. The
In Fig. 2 sind wieder die Materialbahn 1, der Sender 2 und der Empfänger 3 schematisch dargestellt. Der Ultraschallsender 2 wird von einem Impulsfolgegenerator 4 gespeist, der eine bestimmte Impulsfolge vorgegebener Folgefrequenz abgibt. Wie bereits erwähnt, lässt sich das Verfahren auch mit Einzelimpulsen durchführen. In diesem Fall wird anstelle des Impulsfolgegenerators 4 ein Impulsgenerator verwendet. Diese elektrische Impulsfolge wird im Sender in ein Schallwellenpaket umgewandelt, abgestrahlt und als Schallwellenpaket vom Empfänger empfangen, wobei die empfangene Energie vom Abdeckungsgrad des Strahls durch die Materialbahn bestimmt wird. Die Schallwellen werden im Empfänger direkt in elektrische Signale umgewandelt, gegebenenfalls in einem Verstärker 5 verstärkt und dann einer aktivierbaren Abtasteinrichtung 6 zugeführt. Die Abtasteinrichtung 6 weist einen Schalter 7 auf, der die vom Verstärker 5 abgegebenen Signale dem Spitzenwertgleichrichter 8 zuführt. Der Spitzenwertgleichrichter 8 besteht beispielsweise aus der Zusammenschaltung einer Diode mit einem Kondensator, wie es symbolisch dargestellt ist. Nach Beendigung der Abtastperiode wird der Schalter 7 geöffnet und der im Spitzenwertgleichrichter festgehaltene Wert mittels einer Übertragungsschaltung 9 einem Speicher zugeführt. Die Übergangsschaltung 9 kann beispielsweise aus einem Schalter 11 und einem Kondensator 10 bestehen. Durch Schliessen des Schalters 11 wird die Ladung aus dem Spitzenwertgleichrichter auf den Kondensator 10 übertragen und dann zur Weiterverarbeitung über die Leitung 15 einem nicht näher dargestellten Speicher zugeführt.2, the material web 1, the
Zur Erläuterung des Funktionsablaufs wird Fig. 3 herangezogen. Die Ablaufsteuerung wird von einem Impulsgenerator 13 beaufschlagt, der gleichzeitig Impulse an den Impulsfolgegenerator 4 liefert. Zum Zeitpunkt T1 schliesst die Ablaufsteuerung den Schalter 14 und aktiviert den Impulsfolgegenerator, der beispielsweise eine Impulsfolge mit drei Impulsen abgibt. Demzufolge strahlt der Sender 2 ein Wellenpaket mit der gleichen Periodendauer ab. Zum Zeitpunkt T2 wird über die Ablaufsteuerung 12 der Schalter 14 geöffnet und der Schalter 7 geschlossen. Die Zeitdifferenz T2-T1 entspricht etwa der Laufzeit der Schallwellen vom Sender zum Empfänger. Der Schalter 7 bleibt so lange geschlossen, dass etwa drei Perioden von der Abtastschaltung 6 erfasst werden. Zum Zeitpunkt T3 öffnet der Schalter 7, und der Spitzenwertgleichrichter behält den Spitzenwert, der im Zeitbereich T3-T2 auftritt. Zum Zeitpunkt T4 wird der Schalter 11 geschlossen und der Spitzenwert auf einen Speicher 10 übertragen. Danach ist der Spitzenwertgleichrichter wieder auf Null gestellt, und der Zyklus beginnt von neuem. Auf diese Weise ist sichergestellt, dass während der Abtastperiode nur das Messsignal erfasst wird und keine störenden Reflexionen, die zu einem späteren Zeitpunkt eintreffen würden, den Messwert beeinflussen.3 is used to explain the functional sequence. The sequence control is acted upon by a
Claims (8)
- Method for the detection of the position of a web edge of a material web by means of an ultrasonic detector which is arranged in the web edge region and consists of a transmitter (2) and a receiver (3), wherein the transmitter (2) radiates individual pulses or wave packets consisting of individual pulses at a preset first instant (T1) and the receiver (3) receives the individual pulse or the wave packet and converts it into an electrical oscillation packet,
characterised thereby,
that a preset scanning time span for the received individual pulses or the oscillation packet starts at a second instant (T2), which is later than the first instant (T1) with a time span (T2 - T1) that is approximately equal to the transit time of sound waves between transmitter (2) and receiver (3), that the indivudual pulses or the oscillation packet having been received during the scanning time span are stored at a later instant (T4), wherein the time span (T3 - T1) between the end of the scanning time span (T3) and the first instant (T1) is shorter than a time span needed by a reflection interference signal which was emitted by the transmitter as a signal at the first instant and gets to the receiver by way of an indirect path and that the interval time before the radiation of the next individual pulse or wave packet is so great that the reflection interference signal of the preceding individual pulse or wave packet has decayed. - Method according to claim 1, characterised thereby, that the peak value of the scanned oscillation packet is determined as scanning value in the scanning period.
- Method according to claim 2, characterised thereby, that the scanning range comprises the first three to five periods of the oscillation packet.
- Arrangement for the detection of the position of the web edge of a material web (1) with an ultra-sonic detector which is arranged in the web edge region and consists of a transmitter (2) and a receiver (3), wherein the transmitter (2) radiates wave packets consisting of individual pulses at a first instant (T1) and the receiver (3) receives the wave packet at a second instant (T2) and converts it into an electrical oscillation packet, a limited region of the oscillation packet is scanned during a time scan (T3-T2) following the second instant and the scanning value is scanned at a later instant (T4), and wherein the time span (T2-T1) between the first and the second instant is approximately equal to the transit time of the sound waves, the time span (T3-T1) between the end of the scanning time span (T3-T2) and the first instant (T1) is shorter than a time span needed by a reflection interference signal which was emitted by the transmitter as a signal at the first instant (T1) and gets to the receiver by way of an indirect path and the interval time before the radiation of the next individual pulse or wave packet is so great that the reflection interference signals of the preceding individual pulse or wave packet have decayed, characterised thereby, that the transmitter (2) is fed by a pulse sequence generator (4) and that an activatable peak value rectifier (6) is connected behind the receiver (3) and followed in the circuit by an activatable transfer circuit (9) for the transfer of the peak value to a store (10).
- Arrangement according to claim 4, characterised thereby, that a pulse generator (13) is provided, which acts on an operating course control (12) and the pulse sequence generator (4), that the operating course control (12) causes the pulse sequence generator to generate pulse sequences, activates the peak value rectifier (6) in the scanning period and subsequently causes the transfer circuit (9) to store the peak value.
- Arrangement according to one of the claims 5 or 6, characterised thereby, that the transmitter (2) and the receiver (3) are arranged on the same side of the material web (1).
- Arrangement according to one of the claims 5 or 6, characterised thereby, that the transmitter (2) and the receiver (3) are arranged on different sides of the material web.
- Arrangement according to one of the claims 1 to 7, characterised thereby, that only one ultrasonic transducer operates as transmitter and receiver under an appropriate control.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3442154 | 1984-11-17 | ||
| DE19843442154 DE3442154A1 (en) | 1984-11-17 | 1984-11-17 | METHOD FOR DETECTING THE POSITION OF THE STRIP EDGE OF A MATERIAL RAIL |
| PCT/EP1985/000598 WO1986002913A1 (en) | 1984-11-17 | 1985-11-09 | Method for detecting the position of the band edge of a material sheet |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0201576A1 EP0201576A1 (en) | 1986-11-20 |
| EP0201576B1 EP0201576B1 (en) | 1989-01-18 |
| EP0201576B2 true EP0201576B2 (en) | 1994-05-04 |
Family
ID=6250608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85905810A Expired - Lifetime EP0201576B2 (en) | 1984-11-17 | 1985-11-09 | Method for detecting the position of the band edge of a material sheet |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4901292A (en) |
| EP (1) | EP0201576B2 (en) |
| JP (1) | JPH06105172B2 (en) |
| DE (2) | DE3442154A1 (en) |
| WO (1) | WO1986002913A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102471949A (en) * | 2009-08-14 | 2012-05-23 | 里特机械公司 | Monitoring and controlling a belt guide in a winding device |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3913601A1 (en) * | 1989-04-25 | 1990-10-31 | Dornier Gmbh Lindauer | Band control for screen band dryer - uses auxiliary control rollers and ultrasonic measurement of band edge position |
| US5072414A (en) * | 1989-07-31 | 1991-12-10 | Accuweb, Inc. | Ultrasonic web edge detection method and apparatus |
| US5274573A (en) * | 1989-07-31 | 1993-12-28 | Accuweb, Inc. | Ultrasonic web edge detection method and apparatus |
| DE9000783U1 (en) * | 1990-01-24 | 1990-03-29 | Schwark, Hans-Friedrich, Dr. Ing., 8000 München | Scanning device for scanning the edge of a material web |
| US4963807A (en) * | 1990-02-06 | 1990-10-16 | Zip-Pak Incorporated | Ultrasonic web edge guide circuit |
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| DE10337673B3 (en) * | 2003-08-16 | 2005-04-28 | Erhardt & Leimer Gmbh | Method and device for detecting the position of an edge of a moving web |
| FI118274B (en) * | 2004-02-05 | 2007-09-14 | Metso Paper Inc | Method and apparatus for determining the lateral position of the edge of a web or tissue in a sheet forming machine |
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| DE102006029139A1 (en) | 2006-06-22 | 2007-12-27 | Betriebsforschungsinstitut VDEh - Institut für angewandte Forschung GmbH | Measuring device for determining the strip edge position, the bandwidth and / or the tension distribution over the bandwidth of a band |
| EP2186624B1 (en) * | 2008-11-18 | 2015-08-26 | Tetra Laval Holdings & Finance S.A. | Apparatus and method for detecting the position of application of a sealing strip onto a web of packaging material for food products |
| JP5119496B2 (en) * | 2008-12-12 | 2013-01-16 | 竹中電子工業株式会社 | Ultrasonic edge sensor |
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| DE3242284A1 (en) * | 1982-11-16 | 1984-05-17 | Philips Patentverwaltung Gmbh, 2000 Hamburg | METHOD AND ARRANGEMENT FOR DETERMINING THE RUNTIME OF AN ULTRASONIC PULSE |
-
1984
- 1984-11-17 DE DE19843442154 patent/DE3442154A1/en active Granted
-
1985
- 1985-11-09 DE DE8585905810T patent/DE3567618D1/en not_active Expired
- 1985-11-09 US US06/888,322 patent/US4901292A/en not_active Expired - Lifetime
- 1985-11-09 WO PCT/EP1985/000598 patent/WO1986002913A1/en not_active Ceased
- 1985-11-09 EP EP85905810A patent/EP0201576B2/en not_active Expired - Lifetime
- 1985-11-09 JP JP60505127A patent/JPH06105172B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102471949A (en) * | 2009-08-14 | 2012-05-23 | 里特机械公司 | Monitoring and controlling a belt guide in a winding device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3442154A1 (en) | 1986-05-28 |
| JPS62501520A (en) | 1987-06-18 |
| US4901292A (en) | 1990-02-13 |
| EP0201576A1 (en) | 1986-11-20 |
| JPH06105172B2 (en) | 1994-12-21 |
| EP0201576B1 (en) | 1989-01-18 |
| DE3567618D1 (en) | 1989-02-23 |
| WO1986002913A1 (en) | 1986-05-22 |
| DE3442154C2 (en) | 1989-08-31 |
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