EP1261849A2 - Verfahren und vorrichtung zur berührungslosen füllstandsmessung - Google Patents
Verfahren und vorrichtung zur berührungslosen füllstandsmessungInfo
- Publication number
- EP1261849A2 EP1261849A2 EP01929350A EP01929350A EP1261849A2 EP 1261849 A2 EP1261849 A2 EP 1261849A2 EP 01929350 A EP01929350 A EP 01929350A EP 01929350 A EP01929350 A EP 01929350A EP 1261849 A2 EP1261849 A2 EP 1261849A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- transmitter
- sequence
- reception
- pattern
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
Definitions
- the invention relates to a method for non-contact level measurement of a liquid in a container according to the features of the preamble of claim 1.
- the invention further relates to a device for performing the method according to the features of the preamble of claim 6
- the known contactless full-level meters all use a transmitter and a receiver, the transmitter emitting oscillation waves, which the receiver detects after reflection on the liquid surface. The determined transit time or phase difference of the signal is then converted to the distance traveled and the resulting full level In most devices for non-contact full-level measurement, both the transmitter and receiver are anoid at a distance above the maximum liquid level.
- Dei Sendei sends a signal in the direction of the liquid, being flat. At the liquid surface, the signal is at least partially effective and occurs this way back to the receiver, which proves the incoming signal.
- the level of fullness is determined from the reflected bottom signal, and not from the signal reflected at the liquid level.
- the calculation is based on the running time of the bottom signal, the actual ground clearance, the dielectric number and the permeability number of the liquid.
- the method is therefore only for liquids to be used with a precisely determined number of dielectricity and permeability.
- the ground signal will also be difficult to separate from the noise, so that the measurement does not significantly improve the quality of the measurement
- a fullness measuring device is known from EP 0296583 A2, which is equipped with an ultrasound transducer which, on the basis of received echo signals, generates electrical signals which are fed to a receiver circuit via a filter device.
- the filter device must be narrow-band in order to optimally filter out interference, and also in its range
- the center frequency corresponds to the working frequency of the transmitter, the latter being able to change depending on the ambient conditions.
- the compensation for this variation is achieved in that a plurality of phase-selective phase-selective rectifiers are provided, the outputs of which are connected to a maximum selector upstream of the receiver circuit Further expansion of the equalization with the largest useful signal selected. In this invention too, a poor signal / noise ratio will lead to unreliable fullness measurements
- the invention has set itself the task of providing a method and a device for carrying out the procedure, by means of which, despite the poor signal-to-noise ratio and multiple reflections, permissible full-level measurements are made possible
- the essence of the invention is to isolate the pattern of the transmission signal contained in the received signal, which results after reflection at the liquid surface. Since this, apart from transmission interference, has the same shape as the originally transmitted pattern, its shape can be in the receiving signal can be recognized by using a signal processing method known per se in the prior art, known as correlation. Co ⁇ elation is understood as a measure of the similarity of two signals
- the Veifahien according to the Eifindien can be carried out in a variety of ways. In particular, it can also be carried out in a computer and its working memory. With a Haidware solution, on the other hand, very high working speeds can be maintained
- the deployment is independent of the physical nature of the transmission signal. as long as the signal has a recognizable pattern, the shape of which enables correlation.
- the transmitter and receiver must be selected accordingly. If necessary, the transmitter and receiver can also be implemented as a structural unit
- the transmission signal can be provided with any pattern, in particular it can be frequency- or pulse-modulated, the only thing that is decisive is the recognizability of a pattern in comparison to any existing interference signals or noise.
- pattern is therefore to be understood very broadly
- the pattern of the transmission signal is a rectangular pulse, the characteristic size of which essentially represents the pulse length.
- the advantage of this simple pattern is that the height of the signal is not required as an information carrier, so that the reception signal can be normalized without falsifying the information content contained.
- the standardized received signal can then be converted in a simple manner into a bit pattern, which can be compared in an equally simple manner with a comparison bit pattern.
- the bit-by-bit comparison which is made possible has the advantage that for the Vei one is only one low computing power is necessary
- the technical procedures for normalizing the received signal, converting it into a bit pattern and for bit-wise comparison of the bit pattern with a given bit pattern are well known to the person skilled in the art
- the eikennbaikeit the pattern of the transmission signal can be improved by the fact that a pulse sequence of rectangular pulses forms the pattern, as is advantageously beaten in Anspmch 3 or 8 voi.
- This pulse sequence can also be converted into a bit pattern, the information from dei Lange, after standardization The rectangular impulses and the length of the pauses between the impulses are formed.
- the advantage of using an impulse sequence is that random matching between comparison and reception values is unlikely! become
- the time interval between successive foot level measurements can therefore be significantly reduced, since a signal reflected on the floor cannot be confused with an ice level measurement and a signal reflected from the liquid surface cannot be confused with a second level measurement due to the change in the pattern in between. It is understood that the stored sequence of comparison values in the event of a change in the pattern of the signal must be correspondingly adapted to the new pattern before the comparison by correlation
- a reference signal is generated by reflection of the transmitted signal emitted by the transmitter at a reflection point at a defined distance from the transmitter and receiver and is expanded to determine a value of the radiation.
- the speed of propagation of the signal depends on the ambient conditions, in particular of the temperature and the pressure conditions when filling the container. These changes can be taken into account by the transmission signal running through a known distance, determining this transit time and calculating the running or propagation speed therefrom.
- the known distance is generated by forming a reflection part, whereby The distance of the reflection point from the transmitter and receiver is known.
- the receiver therefore mostly receives the reflection signal formed by reflection at the reflection parts and after the signal reflected on the liquid surface From a first established correspondence of the pattern of the received signal with the known form of the pattern of the transmitted signal, a speed of propagation of the signal can thus be determined, on the basis of which a second determined disagreement of the pattern of the received signal with the known form of Patterns of the transmission signal in a traversed path can graze, dei dei level can be determined
- the transmitter and receiver are arranged in the return gas path of the full organ, via which the container can be supplied with liquid. With the return gas path, a free path to the liquid in the container is ensured that with an arrangement of the transmitter and the receiver in the recycle gas path no additional access has to be formed
- the reflection point is designed as a tapering of the return gas path.
- it is proposed to form this reduction at the lower end of the return gas path
- FIG. 1 shows a section through a full organ with device according to the invention.
- 2a shows a schematic illustration of a bottle partially filled with liquid with various reflection parts
- 2b shows the basic appearance of a received signal which is read from the position of the reflection points according to FIG. 2a
- FIG. 3 shows a block diagram of the detection unit according to the invention
- Fig. 4b is a schematic Dai position dei in the converter clock duichele guided Ko ⁇ elation based on Exemplanschei Bitmustei and
- Figui 5a, b, c examples fm pattern of the transmission signal
- the fulloigan 1 has a fluid chamber 19, in which the liquid filling material 7 is located. Furthermore, the full organ 1 has a pressure-tightly sealed, highly mobile pressure gas element 18, the lower part of which extends into the full material chamber 19. The pressure sealing takes place a sliding seal 14 which is arranged above the full material chamber 19. Inside the return gas element 18, an exhaust gas path 15 is designed as an elongated «cylindrical channel, which emits the gas when the container 3 is filled with the filling material 7. and can eject, the container 3 being poured against a container seal 5 by a non-provided spotting device against a container seal 5 on the fulligan 1
- a transmission egg 11 and a reception egg 12 are attached to the upper end of the return gas path 15 and are connected to a detection unit 2 via signal lines 17a, 17b.
- the detection unit 2 controls the transmission egg 11 by controlling signals over the signal line 1a sends to the sending egg 11, and expands the signals averaged by the receiving egg 12 to determine a running time of that of the sending egg
- the signal emitted from the transmitter 1 1 towards the liquid, which is flat 4 runs through the exhaust gas path 15, an ice-cream portion of the signal is sent to an adapter 13 which is formed at the lower end of the exhaust gas path 15 is, the second part of the signal reaches the liquid, with flat 4 and partially leflecting there.
- the undeflected signal also reaches the receiver 12 via the return gas path 15, the received signal reaches the signaling unit 17 via the signal line 17b
- the propagation speed of the signal can be determined from the transit time of the most deflected signal, from which the path of the signal deflected from the liquid surface 4 can be calculated. If the liquid surface 4 reaches the maximum fill level 4a, in this case Corresponding to the setpoint level, the sensing unit 2 controls the signal line 17c via a valve 10 in the return gas inlet 9 in this way.
- the inflow of the filling material 7 is also uninterrupted by pushing the movably sealed off gas element 18 downwards until the sealing member 6 rests on the lower wall of the full material comb 19
- the container 3 is released from its matched state on the seals 5 and is further transported, for example, to a sealing machine Zui Voi when a new full valve is introduced and a new container 3 is poured onto the seals 5 by opening the valve 10 in the return gas inlet 9
- the container 3 is excited by the start-up of the compressed gas element 18, followed by a fresh inflow of the filling material 7
- Figui 2a clearly shows that the reflection of the transmitted signal emitted by the transmitter 1 1 in the direction of the liquid surface 4 takes place at several locations.
- An ice reflection takes place at an opening 13 of the return gas path 15, it is denoted by ⁇ .
- a second reflection ß takes place at the surface of the liquid 4 instead of the signal leflektieit not only in the most precise, vertical connection to the transmitter 1 1, but also at the edge areas of the liquid surface (ß ').
- a third part of the signal runs all of the liquid 16 in the container 3 and on the bottom 3' of the container 3 reflects ( ⁇ ) partial image 2b shows, in schematic form, the signal arriving at the receiver 12, the ichtlektieite signal ⁇ wnd voi signal ß, the signals ß 'and the signal ⁇ the receiver eichen from it, the speed of propagation of the signal can be mean, as you can see from the temperature and pressure conditions, since the height distance h became known t is and the transit time is determined. With this propagation speed, the travel path of the second incoming reflected signal can be calculated when the transit time of these signals is measured
- the determination unit 2 is schematic as in FIG. 3 shown an A / D-Wandlei 21 which is supplied via the signal line 17b with the received signal of the receiver 12.
- the A / D-Wandlei 21 samples this received signal at a high rate and converts it into digital values.
- the converted width is via a signal line 25 fed into the shift register 22, the shift register having the shift register locations 1 to n
- the determination unit 2 further comprises a memory egg 24, in which comparison values are stored on the memory locations 1 to m, the comparison values representing the shape of the pattern of the transmission signal.
- the memory egg 24 can be designed to be permanently storage or can be moved over.
- the comparison of the comparison values in the memory 24 with the in the shift register 22 in the converter clock successively shifted received values takes place in a Ko ⁇ elationsaku 23, which also has places 1 to m
- both the shift register 22 and the correlation unit 23 are connected via the clock line 26 to the A / D converter 21, so that both in Converter clock are clocked.
- the coordination relation is connected in places to the shift register 22 via signal lines 27, and likewise to the memory 24 via signal lines 28.
- reception range and comparison values to be compared are read in via these signal lines 27, 28 and are read in time with the A / D - converter 21 in the correlati On unit 23 eg binary multiplication compared
- the result of this comparison represents the correlation value.
- This value is fed via a signal line 29 in the wall clock cycle to an expansion unit 30, in which the time of reception is determined, since the maximum coordination value can be assigned to a cycle time, and this clock time of maximum correlation corresponds to the time of reception
- FIGS. 4a and 4b show an example to illustrate the temporal sequence of scanning and wandein
- FIG. 4a shows how the A / D converter 21 samples the received signal E in cycles at the clock instants a, a + 1, a + 4 and the scanning range in the sliding element 22 in Foim dei scanning range f (a),, f (a + 4) are injected into the spokes 1 to n of the sliding egg 22
- Figui 4 b veideuthcht the function of the Konelationsemheit 23 based on the example of a received signal dei Fonn ll lj li l
- the shifting clock of the A / D-Wandleis 21 duich runs the sequence of reception widths the pushing egistei 22
- the pattern to be identified is 1
- the existence of the maximum range of correlation can be determined, for example, by duich Vei with a voi
- FIG. 5 shows preferred examples of patterns of the transmission signal.
- Partial picture 5a shows a typical rectangular pulse with a defined time length
- partial picture 5b shows a pulse sequence of rectangular pulses consisting of a short, a long and a wide short pulse
- partial picture 5c shows two successive pulse sequences of rectangular pulses with different patterns
- the first pulse sequence consists of a short, a long and then again a short pulse, the second of three short pulses, followed by a long pulse
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10009406 | 2000-02-28 | ||
DE10009406A DE10009406C2 (de) | 2000-02-28 | 2000-02-28 | Verfahren und Vorrichtung zur berührungslosen Füllstandsmessung |
PCT/EP2001/001909 WO2001063223A2 (de) | 2000-02-28 | 2001-02-20 | Verfahren und vorrichtung zur berührungslosen füllstandsmessung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1261849A2 true EP1261849A2 (de) | 2002-12-04 |
Family
ID=7632744
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01929350A Withdrawn EP1261849A2 (de) | 2000-02-28 | 2001-02-20 | Verfahren und vorrichtung zur berührungslosen füllstandsmessung |
Country Status (5)
Country | Link |
---|---|
US (1) | US20030010116A1 (de) |
EP (1) | EP1261849A2 (de) |
BR (1) | BR0108323A (de) |
DE (1) | DE10009406C2 (de) |
WO (1) | WO2001063223A2 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2002224482A1 (en) | 2000-11-06 | 2002-05-15 | First Usa Bank, N.A. | System and method for selectable funding of electronic transactions |
DE102004017560B4 (de) * | 2003-04-10 | 2007-03-15 | Vega Grieshaber Kg | Füllstandmesser für Flaschen |
DE102005011686B4 (de) * | 2005-03-11 | 2020-02-27 | Krohne S.A. | Verfahren zur Messung des Füllstands eines in einem Behälter vorgesehenen Mediums auf der Grundlage des Radar-Prinzips |
US8296168B2 (en) * | 2006-09-13 | 2012-10-23 | University Of Maryland | System and method for analysis of an opinion expressed in documents with regard to a particular topic |
WO2008147223A1 (en) * | 2007-05-28 | 2008-12-04 | Bep Marine Limited | Improvements relating to ultrasonic distance measuring devices |
DE102011114874A1 (de) * | 2011-09-30 | 2013-04-04 | Carl Zeiss Microscopy Gmbh | Auswerteschaltung für einen optoelektronischen Detektor und Verfahren zum Aufzeichnen von Fluoreszenzereignissen |
US10809142B2 (en) * | 2018-03-26 | 2020-10-20 | Honeywell International Inc. | Steam physical property measurement using guided wave radar |
DE102018126303B4 (de) * | 2018-10-23 | 2021-03-11 | Khs Gmbh | Füllsystem zum Füllen von Behältern mit einem flüssigen Füllgut sowie Füllmaschine |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH607002A5 (de) * | 1976-06-09 | 1978-11-30 | Endress G H & Co | |
US4448207A (en) * | 1981-11-03 | 1984-05-15 | Vital Metrics, Inc. | Medical fluid measuring system |
US4815323A (en) * | 1985-06-28 | 1989-03-28 | Simmonds Precision Products, Inc. | Ultrasonic fuel quantity gauging system |
DE3721212A1 (de) * | 1987-06-26 | 1989-01-05 | Vega Grieshaber Gmbh & Co | Fuellstandsmessgeraet mit ultraschallwandler |
US4928525A (en) * | 1989-03-02 | 1990-05-29 | Aderholt Gary L | Sonic tank inventory control system and method |
DE4202677C1 (de) * | 1992-01-31 | 1993-09-30 | Ita Ingb Testaufgaben Gmbh | Vorrichtung zur Überprüfung einer Übertragungsstrecke |
DE4233324C2 (de) * | 1992-10-05 | 1996-02-01 | Krohne Messtechnik Kg | Verfahren zur Messung des Füllstandes einer Flüssigkeit in einem Behälter nach dem Radarprinzip |
DE4233677C2 (de) * | 1992-10-07 | 1995-07-13 | Grieshaber Vega Kg | Verfahren zum Korrelationsempfang von vorbekannten periodisch ausgesendeten Impulsen und Vorrichtung zur Durchführung des Verfahrens sowie Verwendung derselben |
DE4327333C2 (de) * | 1993-08-15 | 1996-08-08 | Krohne Messtechnik Kg | Verfahren zur Messung des Füllstandes einer Flüssigkeit in einem Behälter nach dem Radarprinzip |
DE19845116C1 (de) * | 1998-09-30 | 1999-12-30 | Siemens Ag | Verfahren und Vorrichtung zur Füllstandmessung |
-
2000
- 2000-02-28 DE DE10009406A patent/DE10009406C2/de not_active Expired - Fee Related
-
2001
- 2001-02-20 BR BR0108323-6A patent/BR0108323A/pt not_active Application Discontinuation
- 2001-02-20 US US10/204,793 patent/US20030010116A1/en not_active Abandoned
- 2001-02-20 WO PCT/EP2001/001909 patent/WO2001063223A2/de not_active Application Discontinuation
- 2001-02-20 EP EP01929350A patent/EP1261849A2/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO0163223A2 * |
Also Published As
Publication number | Publication date |
---|---|
US20030010116A1 (en) | 2003-01-16 |
BR0108323A (pt) | 2003-02-18 |
DE10009406A1 (de) | 2001-09-13 |
WO2001063223A3 (de) | 2002-03-21 |
WO2001063223A2 (de) | 2001-08-30 |
DE10009406C2 (de) | 2002-01-10 |
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Inventor name: CAVAZZINI, PAOLO Inventor name: AHLERS, EGON Inventor name: HASLER, UWE |
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