WO1999001722A1 - Verfahren und vorrichtung zum erfassen der füllhöhe von füllgut in einem behälter - Google Patents
Verfahren und vorrichtung zum erfassen der füllhöhe von füllgut in einem behälter Download PDFInfo
- Publication number
- WO1999001722A1 WO1999001722A1 PCT/EP1998/004103 EP9804103W WO9901722A1 WO 1999001722 A1 WO1999001722 A1 WO 1999001722A1 EP 9804103 W EP9804103 W EP 9804103W WO 9901722 A1 WO9901722 A1 WO 9901722A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- container
- radiation
- filling
- containers
- tank
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 12
- 230000005855 radiation Effects 0.000 claims abstract description 16
- 230000005670 electromagnetic radiation Effects 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 2
- 230000007704 transition Effects 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000001514 detection method Methods 0.000 description 7
- 239000011521 glass Substances 0.000 description 6
- 239000012611 container material Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229940056932 lead sulfide Drugs 0.000 description 1
- 229910052981 lead sulfide Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000005028 tinplate Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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
- G01F23/292—Light, e.g. infrared or ultraviolet
Definitions
- the invention relates to a method and a device for detecting the filling level of filling material in a container, wherein electromagnetic radiation of a wavelength in the infrared range emanating from the container is examined and the upper part of the container containing no filling material has a different temperature than that lower part of the container containing filling material.
- the level of liquid or solid contents in transparent containers e.g. Glass bottles or canned jars were previously determined using light barriers or CCD cameras.
- the interruption or covering of a light beam by the product is detected by means of a photo receiver or a CCD camera.
- capacitive sensors can also be used if that
- Product is conductive or has a high dielectric constant.
- metal containers e.g. Beverage or food cans have hitherto only been used so-called gamma-ray or X-ray devices, which are based on measuring the absorption of an X-ray in the 60 k electron volt range. Weighing systems are also used for small capacities. In practice, however, considerable expenses are required to ensure operation.
- the invention has for its object to carry out the detection of the fill level of the contents in containers in a simple and reliable manner.
- this object is achieved in that the temperature difference is achieved in that the container is heated or cooled from the outside after filling
- the cold / warm transition at the level is artificially generated by briefly heating the container from the outside, e.g. is cooled by an infrared radiator, an induction heater, hot air, hot water, etc., or by cold air or cold water. Because the filling material has a different and generally higher heat capacity than the relatively thin container wall, the temperature change in the filled lower region of the container takes place much more slowly than above the filling level, where only the container wall is heated or cooled without the filling material lying against it .
- the cold / warm transition can be recorded and evaluated with a thermal camera.
- a separate source for the thermal radiation is not available, rather the thermal radiation emitted by the outer wall of the container is examined to determine the fill level.
- the thermal camera system can have optics as well as a matrix-like, cooled diode array or a single-line, cooled diode array with a sensitivity in the wavelength range from 1 to 6 ⁇ m. Such a line scanner scans and creates the passing containers perpendicular to the direction of transport thus ultimately also a two-dimensional image.
- uncooled pyroelectric sensors can also be used, for example lead sulfide sensors, which are sensitive in the range from 8 to 12 ⁇ m wavelength. Because of their larger dimensions, pyroelectric sensors are generally not arranged vertically, but rather slightly inclined in order to obtain a better resolution in the vertical. If only one overfill or underfill zone is to be detected, individual heat-sensitive sensors are also sufficient.
- the fill level can be determined even more precisely by interpolating the heat transfer area.
- the thermal imager provides a grayscale image, the gray value being a measure of the temperature.
- This thermal image is processed according to standard image evaluation methods.
- the filled lower area of the container can be recognized on the thermal image by the lower or higher radiation intensity.
- the filling level of a liquid in a glass or plastic bottle can be determined very reliably, since most liquids, in particular in the infrared range above 1 ⁇ m wavelength
- the method according to the invention is also suitable for container material which is not permeable to heat radiation, provided that the filling has a high thermal capacity and high thermal conductivity, as is generally the case with liquid filling.
- This method is less suitable for powdery products with poor thermal conductivity.
- a prerequisite is also a certain thermal conductivity of the container material, as is the case with tin cans, glass or thin-walled plastic containers.
- the cold / warm transition remains only after the heating up or cooling down of the outside of the container for a few fractions of a second to a few seconds depending on the thermal conductivity of the container material, so that the detection device (matrix thermal camera, line scanner, individually) Heat sensors) of the heating or cooling device should be connected immediately.
- the particular advantage of the method according to the invention is that it is independent of the process of filling the container in terms of time and space. It is e.g. It is possible to provide a heating device after the filling device, in which the filling material is filled in cold, and then to detect the warm / cold transition between the warm, empty, upper area of the container and the cold, lower, filled area of the container. Conversely, after pasteurizing the filling, a cooling device can be provided, in which e.g. the outside of the container is cooled by means of a cold water spray nozzle. The upper region of the container, which is not in contact with the hot filling material, cools down much faster than the lower region, in which the filling material is located. At the boundary between the two, there is again a cold / warm transition, which can be detected in the manner described above.
- containers 20 are transported on a conveyor 10 at a predetermined speed.
- the containers are tinplate canned cans with a wall thickness of approximately 0.5 mm, which in this case are approximately 80% filled with water.
- a detection device 30 is arranged to the side of the transporter 10 ′′ , the optical axis of which is at an angle of 90 ° to the transport direction.
- the detection device 30 is a thermal camera system with a lens 31, a single-line, cooled diode array 32, the sensitivity of which is in the range of 1 up to 6 ⁇ m wavelength, an amplifier 33, which amplifies the signals generated by the diode array 32, and an evaluation device 34, which reads out the amplified signals of the diode array 32.
- the evaluation device 34 By feeding the containers 20 in the transport direction, the evaluation device 34 generates a two-dimensional image of the containers, the transport speed of the conveyor 10 is determined by a clock 50 so that the thermal image can be composed line by line from the individual vertical lines ..
- the two-dimensional image obtained is examined for the presence of gray levels according to known standard methods, whereby the horror correspond to temperature transitions.
- the width of such transition areas is approximately on the order of 5 mm. to
- the values in this area are interpolated.
- a tunnel-shaped heating device 40 Immediately in front of the detection device 30 is a tunnel-shaped heating device 40, in which the containers 20 are heated up by briefly directing hot air onto the outside of the containers 20.
- the distance between the end of the heating device 40 and the point along the conveyor 10, at which the outside of the container 10 is examined by the detection device 30, is chosen so that at this point and at the point in time in question the temperature difference as clear as possible between the lower, water-filled area and the upper, empty area of the container.
- the temperature difference between the upper and lower region of the container is not yet very pronounced.
- the lower part cools down much more quickly after leaving the heating section 40, since heat is withdrawn from it by the water, which is present on the inside of the container.
- the upper part of the container cools down much more slowly, since it changes its temperature only by heat conduction within the container material in the vertical direction, by radiation, convection, etc. In the case of conventional tin cans, this temperature difference is clearly pronounced approximately up to 1 second after leaving the heating section 40. At a transport speed of 1 m / sec, the distance between the point at which the fill level is detected and the heating section 40 can therefore be up to 1 m.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002294217A CA2294217A1 (en) | 1997-07-04 | 1998-07-03 | Method and device for determining the filling height of a product in a tank |
BR9811661-4A BR9811661A (pt) | 1997-07-04 | 1998-07-03 | Processo e dispositivo para averiguar o nìvel de enchimento de material de enchimento em um recipiente |
JP50635199A JP2002508070A (ja) | 1997-07-04 | 1998-07-03 | 容器中における製品の充填レベルを検出するための方法および装置 |
EP98939608A EP0993594A1 (de) | 1997-07-04 | 1998-07-03 | Verfahren und vorrichtung zum erfassen der füllhöhe von füllgut in einem behälter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1997128660 DE19728660A1 (de) | 1997-07-04 | 1997-07-04 | Verfahren und Vorrichtung zum Erfassen der Füllhöhe von Füllgut in einem Behälter |
DE19728660.7 | 1997-07-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999001722A1 true WO1999001722A1 (de) | 1999-01-14 |
Family
ID=7834688
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1998/004103 WO1999001722A1 (de) | 1997-07-04 | 1998-07-03 | Verfahren und vorrichtung zum erfassen der füllhöhe von füllgut in einem behälter |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0993594A1 (de) |
JP (1) | JP2002508070A (de) |
BR (1) | BR9811661A (de) |
CA (1) | CA2294217A1 (de) |
DE (1) | DE19728660A1 (de) |
WO (1) | WO1999001722A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7727567B2 (en) | 2004-11-05 | 2010-06-01 | Heuft Systemtechnik Gmbh | Method of establishing the integrity of a product located in a container |
CN112299348A (zh) * | 2020-10-26 | 2021-02-02 | 邓建军 | 一种糖尿病病人用药膏制备装置 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4170164B2 (ja) * | 2003-06-30 | 2008-10-22 | 株式会社エスアールエル | 試験管内検体液面位置検出システム |
JP4471286B2 (ja) * | 2005-03-02 | 2010-06-02 | 三菱重工食品包装機械株式会社 | 回転式充填装置 |
JP2007278778A (ja) * | 2006-04-05 | 2007-10-25 | Kirin Techno-System Co Ltd | 液体充填容器の検査装置 |
EP4116678A1 (de) | 2021-07-05 | 2023-01-11 | Rosemount Tank Radar AB | System und verfahren zur nichtintrusiven kontaktlosen füllstandbestimmung |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE673295A (de) * | ||||
US3120757A (en) * | 1961-10-04 | 1964-02-11 | Neirad Ind Inc | Method and means for determining the level of a liquid in a container |
US3499154A (en) * | 1967-09-28 | 1970-03-03 | Universal Oil Prod Co | Apparatus for locating the interface between two superimposed fluids within a vessel utilizing infrared detector means |
US5568262A (en) * | 1994-05-31 | 1996-10-22 | Lachapelle; Joseph G. | Non-destructive fill volume measurement system |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1174246B (de) * | 1961-07-04 | 1964-07-16 | Industrial Nucleonics Corp | Anordnung zum Regeln der Fuellhoehe an einer Abfuellmaschine |
US3454759A (en) * | 1966-04-22 | 1969-07-08 | Industrial Dynamics Co | Infrared liquid level inspection system for a container which may contain foam above the liquid |
DE2506190C2 (de) * | 1974-09-26 | 1985-08-29 | Ceda S.p.A., Buttrio, Udine | Vorrichtung zur Regelung des Niveaus einer in einem Behälter befindlichen Flüssigkeit, die Infrarotstrahlen aussendet |
US4121103A (en) * | 1976-11-05 | 1978-10-17 | Industrial Dynamics Company, Ltd. | Caustic detection system |
DE3128094C2 (de) * | 1981-07-16 | 1983-12-29 | Justus Technik GmbH Industrie-Anlagen, 2000 Hamburg | Verfahren zum Messen des Füllstandes von durchsichtigen oder durchscheinenden Behältern |
JPS58150826A (ja) * | 1982-03-03 | 1983-09-07 | Sumitomo Metal Ind Ltd | 溶鋼湯面レベル測定方法 |
DE9015158U1 (de) * | 1990-11-03 | 1991-02-07 | Lich-Goemmer, Ingeborg, 6300 Giessen, De | |
DE4410515C2 (de) * | 1994-03-28 | 1999-07-22 | Retec Elektronische Regeltechn | Kontrollvorrichtung für Füllstände |
DE9417615U1 (de) * | 1994-11-03 | 1994-12-15 | Kugler Julius & Co Gmbh | Fülleinrichtung für Behälter |
-
1997
- 1997-07-04 DE DE1997128660 patent/DE19728660A1/de not_active Withdrawn
-
1998
- 1998-07-03 EP EP98939608A patent/EP0993594A1/de not_active Withdrawn
- 1998-07-03 BR BR9811661-4A patent/BR9811661A/pt not_active IP Right Cessation
- 1998-07-03 CA CA002294217A patent/CA2294217A1/en not_active Abandoned
- 1998-07-03 WO PCT/EP1998/004103 patent/WO1999001722A1/de not_active Application Discontinuation
- 1998-07-03 JP JP50635199A patent/JP2002508070A/ja active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE673295A (de) * | ||||
US3120757A (en) * | 1961-10-04 | 1964-02-11 | Neirad Ind Inc | Method and means for determining the level of a liquid in a container |
US3499154A (en) * | 1967-09-28 | 1970-03-03 | Universal Oil Prod Co | Apparatus for locating the interface between two superimposed fluids within a vessel utilizing infrared detector means |
US5568262A (en) * | 1994-05-31 | 1996-10-22 | Lachapelle; Joseph G. | Non-destructive fill volume measurement system |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7727567B2 (en) | 2004-11-05 | 2010-06-01 | Heuft Systemtechnik Gmbh | Method of establishing the integrity of a product located in a container |
CN112299348A (zh) * | 2020-10-26 | 2021-02-02 | 邓建军 | 一种糖尿病病人用药膏制备装置 |
Also Published As
Publication number | Publication date |
---|---|
EP0993594A1 (de) | 2000-04-19 |
DE19728660A1 (de) | 1999-01-07 |
JP2002508070A (ja) | 2002-03-12 |
CA2294217A1 (en) | 1999-01-14 |
BR9811661A (pt) | 2000-09-19 |
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