WO2015055743A1 - Système et procédé permettant de déterminer le niveau de dioxyde de carbone dissous dans un liquide dans un récipient scellé - Google Patents

Système et procédé permettant de déterminer le niveau de dioxyde de carbone dissous dans un liquide dans un récipient scellé Download PDF

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Publication number
WO2015055743A1
WO2015055743A1 PCT/EP2014/072165 EP2014072165W WO2015055743A1 WO 2015055743 A1 WO2015055743 A1 WO 2015055743A1 EP 2014072165 W EP2014072165 W EP 2014072165W WO 2015055743 A1 WO2015055743 A1 WO 2015055743A1
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WO
WIPO (PCT)
Prior art keywords
liquid
optical
level
measurement
headspace
Prior art date
Application number
PCT/EP2014/072165
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English (en)
Inventor
Liam LEWIS
David Goulding
Tomasz OCHALSKI
Eamonn O'neill
Guillaume Huyet
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Cork Institute Of Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cork Institute Of Technology filed Critical Cork Institute Of Technology
Publication of WO2015055743A1 publication Critical patent/WO2015055743A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/02—Food
    • G01N33/14—Beverages
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/02—Mechanical
    • G01N2201/022—Casings
    • G01N2201/0221—Portable; cableless; compact; hand-held

Definitions

  • the invention relates to a system and method for calculating carbon dioxide present in the headspace of a liquid in a sealed container.
  • Carbonation is the process by which carbon dioxide (C0 2 ) is dissolved in water or an aqueous solution.
  • the most commonplace application is for carbonated drinks including soft drinks and mineral water.
  • Dissolved C0 2 may also result from the production of the gas by micro-organisms during fermentation of the beverage, as in beer and champagne.
  • C0 2 has a very high dissolution in water because it reacts with it, producing carbonic acid and thus lowering the pH.
  • the quality of such drinks is affected by the level of dissolved C0 2 and the amount of carbonic acid. Therefore an important quality control parameter for the beverage industry is the level of dissolved C0 2 in their drinks and therefore measurement of dissolved C0 2 levels are routinely carried out in practice.
  • the measurement of dissolved C0 2 apart from the quality of the beverage itself, is also of great interest to beverage manufacturers in terms of their packaging.
  • PET plastic is the most common format for carbonated beverage containers and is the highest cost part of the beverage manufacturing process. PET is permeable, so C0 2 gradually escapes over time as the bottles are transported and stored on the shelf. As described above the level of dissolved C0 2 is important for beverage quality and customer experience.
  • EP 2 620 761 assigned to Ft System S.r.l, discloses a system and method for measuring the quantity of carbon dioxide dissolved in a liquid contained in a closed container.
  • the system disclosed uses a laser source that operates on a single wavelength measurement and assumes an ambient temperature when measuring the quantity of carbon dioxide dissolved in a liquid.
  • the measurement system becomes unstable for changes in temperature. As a consequence measurements obtained are inaccurate for temperature variations.
  • Another problem with the Ft System is that the system does not take account of the transparency or thickness of the walls for a particular container. Light path distortion produced by the higher than air refractive index of the container material can therefore make measurements inaccurate.
  • this system is not able to discriminate between different coloured containers with the result that the inaccuracy of the measurements is increased.
  • German Patent Publication number DE 10 2008 005 572 assigned to smartGAS Mikrosensorik GmbH, discloses a similar system described above.
  • the method described in this publication involves designing filter elements according to spectral filtering such that the former filter element filters a radiation source in a spectral region where the presence or concentration of a gas is detected for an inline carbonated liquid or beverage.
  • Two optical paths are provided in the form of single wavelength filters, however a similar problem exists where measurements are only accurate where the temperature is assumed to be ambient.
  • an optical system for calculating the level of C0 2 dissolved in a liquid stored in a sealed container comprising:
  • a light source a light source
  • an optical filter a detector
  • the detector receives a first optical transmission measurement at a first wavelength and a second optical transmission measurement at a second wavelength from light irradiated from the light source through a headspace of the liquid in the sealed container along a single optical path;
  • a processor configured to process the first and second optical transmission measurements to calculate a ratio of the two transmission values, said ratio is proportional to the partial pressure of C0 2 in the headspace;
  • said processor calculates the level of C0 2 dissolved in the liquid from the ratio and a measured or estimated temperature of the liquid.
  • the system is configured to provide temperature stabilisation by preventing changes to the emission spectrum of the light source.
  • the invention provides a system, for example a standalone system or a portable handheld device, that is capable of testing the C0 2 level without opening or piercing the packaging which is in contrast to almost all current systems.
  • the invention works particularly well for PET bottles and works on all colours of PET, in other words the PET does not have to be clear.
  • the headspace can be defined as the gas above the liquid in the sealed container.
  • the system comprises a thermometer configure to measure the temperature of the liquid.
  • the processor uses the calculated partial pressure and the estimated liquid temperature to calculate the level of dissolved C0 2 in units of C0 2 L / Liquid L in the liquid by employing Henry's Gas Law.
  • the first measurement comprises the response of the system to the level of C0 2 in the light path of the headspace and provides the value as a first voltage value.
  • the second measurement comprises the response of the system at a C0 2 off-resonance measurement position as a second voltage.
  • measurement of the level of C0 2 present in the headspace is achieved by recording the system's response on resonance at 2 ⁇ and off resonance at a wavelength which is unaffected by C0 2 .
  • a clamp adapted to secure the container to provide a stable reference point before making any measurement.
  • the clamp is dimensioned to clamp around the neck of a standard PET drinks bottle.
  • the clamp uses a bottle cap, neck flange from the container preform or similar physical feature as a physical reference point to always clamp around the neck of the container in the same location and ensure as a result that the measurement light path is the same for each or all container types.
  • the filter comprises a narrow bandpass filter.
  • thermometer thermometer
  • the detector comprises a photo-detector.
  • the light detector employed is a long wavelength extended InGaAs photodiode which provides linear output voltage response versus received light power.
  • the photo-detector can be temperature stabilised in order to ensure the same linear response for different external temperatures and thereby reduce the level of thermal noise.
  • the container comprises PET material or glass material.
  • a method for calculating the level of C0 2 dissolved in a liquid stored in a sealed container comprising the steps of: irradiating light from a light source through a headspace of the liquid in the sealed container and obtaining at a first optical transmission measurement at a first wavelength and a second optical transmission measurement at a second wavelength using a tuneable optical filter along at least one optical path;
  • a method for calculating the level of C0 2 dissolved in the liquid from the ratio and the temperature of the liquid comprising the steps of: irradiating light from a light source through a headspace of the sealed liquid container and obtaining at least two measurement values;
  • an optical system for calculating the level of C0 2 dissolved in a liquid stored in a sealed container comprising:
  • a light source a filter; and a detector, wherein the detector receives at least two measurement values from light irradiated from the light source through a headspace of the liquid in the sealed container;
  • thermometer configured to estimate the temperature of the liquid
  • a processor configured to process the two measurement values to calculate the ratio of the two measurements that is proportional to the partial pressure of C0 2 in the headspace; and said processor calculates the level of C0 2 dissolved in the liquid.
  • a computer implemented system for calculating the level of C0 2 dissolved in a liquid stored in a sealed liquid container comprising:
  • a processor configured to process the first and second optical transmission measurements to calculate a ratio of the two transmission values, said ratio is proportional to the partial pressure of C0 2 in the headspace;
  • an optical system for calculating the level of C0 2 dissolved in a liquid stored in a sealed container comprising:
  • a light source a light source
  • an optical filter a detector
  • the detector receives a first optical transmission measurement at a first wavelength and a second optical transmission measurement at a second wavelength from light irradiated from the light source through a headspace of the liquid in the sealed container along one or more optical paths;
  • a processor configured to process the first and second optical transmission measurements to calculate a ratio of the two transmission values, said ratio is proportional to the partial pressure of C0 2 in the headspace;
  • said processor calculates the level of C0 2 dissolved in the liquid from the ratio and a measured or estimated temperature of the liquid.
  • a computer program comprising program instructions for causing a computer program to carry out the above method which may be embodied on a record medium, carrier signal or read-only memory.
  • Figure 1 a & 1 b illustrates a plan view and side view of the optical system according to one aspect
  • Figure 2a & 2b illustrates two flowcharts showing how the level of dissolved C0 2 is calculated according to one embodiment
  • Figure 3 compares the measured transmission spectrum (by FT-IR) for an empty bottle with no C0 2 to that with C0 2 (partial pressure of 3bar), where the measured wavelengths for on and off C0 2 resonance are marked;
  • Figure 4 shows the calibrated response of the system to increasing levels of C0 2 in a bottle headspace.
  • the invention is an optical measurement system, based on the principle of mid- infrared spectroscopy, to directly measure the level of dissolved C0 2 in a carbonated beverage, regardless of the beverage composition or alcohol content.
  • the majority of chemical compounds have a response in the mid- infrared spectrum ( ⁇ 3-15 ⁇ ) to the fundamental vibrational modes of their molecular structure.
  • Carbon Dioxide (C0 2 ) exhibits a number of absorption lines in the mid-infrared. The most commonly used absorption is found at 4.26 ⁇ (2349 cm “1 ) and this is the wavelength that is typically used to measure gas phase C0 2 in the atmosphere using transmission spectroscopy.
  • the aim of this system is to measure high partial pressures (-1 -4 bar) within a closed volume. In this scenario, with the level of C0 2 present in the light path, the absorption at 4.26 ⁇ is so strong that it will not allow light to reach the detection system and hence render it useless.
  • the system comprises a light source2, an optical filter 3 and detector 4.
  • the system comprises a temperature measuring device 5 to estimate the temperature of a liquid in a container, for example a bottle, and a processor 6 to calculate the dissolved C0 2 in the liquid and display on a screen 7 or other means.
  • a standard clamp device 8 is shown to clamp a container in place. In the example shown a standard Coca Cola bottle containing a liquid is held in place by the clamp device 8. It will be appreciated that the invention can be employed to most containers and is particularly suitable to bottles containing a beverage, for example a carbonated beverage.
  • the light source is a Light-Emitting Diode (LED) centred at 2 ⁇ with a spectral width of approximately 100nm.
  • Measurement of the level of C0 2 present in the headspace is achieved by recording the system's response on resonance at 2.004 ⁇ and off resonance at a wavelength which is unaffected by C0 2 at 2.004 ⁇ .
  • these on and off resonance wavelengths must ideally be close together with a similar transparency through PET such that any difference in absorption by the plastic will not unduly affect the measurement.
  • an optical filter can be deployed to tune the wavelength of the LED (light source) as seen by the detector. This can be done a number of ways.
  • the optical filter can be preferably a narrow bandpass filter, but it will be appreciated that other filters can be used to achieve the same function.
  • One realisation utilises two separate optical filters with different passbands which correspond to the two measurement wavelengths.
  • a single optical filter can be rotated about a single axis so as the change angle of incidence for the incoming light which will result in a change in the wavelengths transmitted by the filter. Only a single optical path is required in this realisation, although additional optical paths could be contemplated. In this way rotation of the filter allows the system to scan across the wavelength range of interest to make the comparison between on and off resonance.
  • the light is detected using a detector which has response in the 2 ⁇ range.
  • a photo- detector can be selected which has peak efficiency at approximately 2.2 ⁇ , or other suitable wavelength, and so is well suited to the application.
  • the detector is preferably a photo-detector, for example an InGaAs photodiode.
  • the photodetector is also preferably temperature stabilised in order to ensure the same linear response for different external temperatures and thereby reduce the level of thermal noise. It will be appreciated that there are associated electronics to drive the light source and detection circuits that are familiar to the skilled person in the art.
  • the temperature of the beverage must also be measured in order to calculate the level of dissolved C0 2 in the liquid, for example by a thermometer.
  • a thermocouple in contact with the PET bottle surface to estimate the liquid temperature can be used but another approach would be to use any device that could measure the temperature.
  • the contact method assumes that there is thermal equilibrium between the liquid and the PET wall.
  • infrared thermometer with specific calibrated emissivity for the PET material can be used to estimate liquid temperature inside the container.
  • the system will produce two measurements.
  • a first optical measurement at a first wavelength and a second optical measurement at a second wavelength is measured by the photodetector from light received from the light source through the headspace of the liquid in a sealed container along the same optical path, as shown in Figure 1 b.
  • the wavelengths can be set to measure at any suitable wavelength value or range.
  • the thermometer is configured to estimate the temperature of the liquid.
  • a processor is configured to process the first and second optical measurements to calculate a ratio of the two measurements. The ratio of these two responses is proportional to the partial pressure of C0 2 in the headspace. The level of C0 2 dissolved in the liquid will depend on both this partial pressure and the temperature of the beverage.
  • the system software uses both the calculated partial pressure and the estimated liquid temperature to calculate the level of dissolved C0 2 in units of C0 2 L / Liquid L by employing Henry's Gas Law: At a constant temperature, the amount of a given gas that dissolves in a given type and volume of liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid.
  • Figure 2a & 2b illustrates a flowchart for the calculation of the C0 2 level in volumes of C0 2 .
  • the two wavelengths measured by the system are illustrated in the spectra shown in Figure 3.
  • a first optical measurement at a first wavelength and a second optical measurement at a second wavelength are measured and represented as voltage values V1 and V2.
  • the ratio of these two values is calculated to determine the C0 2 partial pressure in the headspace to provide a value P C o2.
  • the temperature of the liquid, measured by the thermometer, is applied as a function of P C o2 and the dissolved C0 2 is calculated that can be subsequently displayed.
  • the ambient temperature changes are not affecting system as all active optical elements can be temperature stabilised.
  • the spectra shown in Figure 3 were measured on a Fourier Transform Infra- Red (FT-IR) spectrometer with a PET bottle placed in the measurement path as is achieved with the system itself.
  • FT-IR Fourier Transform Infra- Red
  • the off-resonance response is measured at a wavelength where there is high PET transparency but no absorption by C0 2 .
  • the on resonance response is where there is high PET transparency coupled to a strong absorption by C0 2 .
  • FIG. 4 The performance of the system is illustrated in Figure 4 where the system measures, and quantifies in volumes of C0 2 , the amount of C0 2 present in a sealed PET bottle with levels ranging from 1 to 5 bars with respect to gas pressure within the vessel.
  • both LED and detector can be temperature controlled using Peltier thermoelectric cooler (TEC). This ensures that the colour of the TEC LED source is conserved; the ratio of light intensity between wavelengths off and on CO2 resonance is conserved; the linearity of detector response is conserved and the detector sensitivity is conserved.
  • TEC Peltier thermoelectric cooler
  • the optical elements the light source (LED), collimating and focusing lenses, tuneable optical filter and detector are fixed along a single axis (optical pathway).
  • the distance of the optical pathway can be set as appropriate, depending on a number of factors, such as the size of a bottle neck.
  • the electronics used to measure the detector response for light passing through the bottle at a wavelength off resonance following this the filter is retuned and again the detector response is measured for light passing through the bottle at the on resonance wavelength.
  • the ratio between the two responses is recalculated to the CO 2 partial pressure according to a specified calibration curve.
  • the electronics also measures the temperature of the bottle below the headspace and sends to a processor, for example a PC, both the partial pressure of CO 2 and the bottle temperature. The PC recalculates these values to the CO 2 carbonation level in the liquid inside the bottle.
  • the embodiments in the invention described with reference to the drawings comprise a computer apparatus and/or processes performed in a computer apparatus.
  • the invention also extends to computer programs, particularly computer programs stored on or in a carrier adapted to bring the invention into practice.
  • the program may be in the form of source code, object code, or a code intermediate source and object code, such as in partially compiled form or in any other form suitable for use in the implementation of the method according to the invention.
  • the carrier may comprise a storage medium such as ROM, e.g. CD ROM, or magnetic recording medium, e.g. a floppy disk or hard disk.
  • the carrier may be an electrical or optical signal which may be transmitted via an electrical or an optical cable or by radio or other means.
  • the terms "comprise, comprises, comprised and comprising” or any variation thereof and the terms include, includes, included and including" or any variation thereof are considered to be totally interchangeable and they should all be afforded the widest possible interpretation and vice versa.

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  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Food Science & Technology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Pathology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Medicinal Chemistry (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

La présente invention concerne un système optique et un procédé permettant de calculer la quantité de CO2 dissous dans un liquide stocké dans un récipient scellé comprenant une source de lumière (2), un filtre optique (3) et un détecteur (4). Le détecteur est configuré de sorte à recevoir une première mesure de transmission optique à une première longueur d'onde absorbée par le CO2, et une seconde mesure de transmission optique à une seconde longueur d'onde qui n'est pas affectée par le CO2, à partir de la lumière irradiée de la source de lumière à travers l'espace libre du liquide dans le récipient scellé, selon un chemin optique unique. Un processeur est configuré pour traiter les première et deuxième mesures de transmission optique afin de calculer un rapport des deux valeurs de transmission, ledit rapport étant proportionnel à la pression partielle du CO2 dans l'espace libre, et afin de calculer le niveau de CO2 dissous dans le liquide à partir du rapport et d'une température estimée du liquide.
PCT/EP2014/072165 2013-10-15 2014-10-15 Système et procédé permettant de déterminer le niveau de dioxyde de carbone dissous dans un liquide dans un récipient scellé WO2015055743A1 (fr)

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EP13188791 2013-10-15
EP13188791.1 2013-10-15

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018112357A1 (fr) * 2016-12-16 2018-06-21 Pepsico, Inc. Carbonatation à réservoir unique pour équipement de boisson gazeuse non alcoolisée
AT521681A4 (de) * 2018-11-09 2020-04-15 Acm Automatisierung Computertechnik Mess Und Regeltechnik Gmbh Labor-Gasmessgerät
AT521839A1 (de) * 2018-11-09 2020-05-15 Acm Automatisierung Computertechnik Mess Und Regeltechnik Gmbh Labor-Gasmessgerät
CN111417852A (zh) * 2017-08-24 2020-07-14 斯丹佛测量系统有限责任公司 在食品包装中的检查方法
WO2024037937A1 (fr) * 2022-08-18 2024-02-22 Wilco Ag Procédé et appareil pour mesurer une concentration d'une espèce gazeuse

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US5473161A (en) 1994-06-21 1995-12-05 The Coca-Cola Company Method for testing carbonation loss from beverage bottles using IR spectroscopy
DE102004063667A1 (de) * 2004-12-31 2006-07-13 Optotransmitter-Umweltschutz-Technologie E.V. Verfahren und Vorrichtungen zur in situ Bestimmung von in Flüssigkeiten gelösten Gasen in geschlossenen Behältnissen
WO2008053507A2 (fr) * 2006-10-30 2008-05-08 Universita Degli Studi Di Padova Procédé permettant une mesure automatique de la pression et de la concentration de gaz à l'intérieur de récipients étanches
DE102008005572A1 (de) 2008-01-22 2009-07-23 Smartgas Mikrosensorik Gmbh Messverfahren und Gassensor zur simultanen Erfassung der Konzentration zweier unterschiedlicher Gase
US20100290045A1 (en) * 2008-07-30 2010-11-18 Saptari Vidi A Multiplex tunable filter spectrometer
EP2522984A2 (fr) * 2011-05-10 2012-11-14 Schlumberger Technology B.V. Procédé et appareil de surveillance et de gestion post-séquestration de dioxyde de carbone
EP2620761A1 (fr) 2012-01-30 2013-07-31 Ft System S.r.l. Groupe pour mesurer directement la quantité de dioxyde de carbone dissous dans un liquide contenu dans un récipient fermé

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5473161A (en) 1994-06-21 1995-12-05 The Coca-Cola Company Method for testing carbonation loss from beverage bottles using IR spectroscopy
DE102004063667A1 (de) * 2004-12-31 2006-07-13 Optotransmitter-Umweltschutz-Technologie E.V. Verfahren und Vorrichtungen zur in situ Bestimmung von in Flüssigkeiten gelösten Gasen in geschlossenen Behältnissen
WO2008053507A2 (fr) * 2006-10-30 2008-05-08 Universita Degli Studi Di Padova Procédé permettant une mesure automatique de la pression et de la concentration de gaz à l'intérieur de récipients étanches
DE102008005572A1 (de) 2008-01-22 2009-07-23 Smartgas Mikrosensorik Gmbh Messverfahren und Gassensor zur simultanen Erfassung der Konzentration zweier unterschiedlicher Gase
US20100290045A1 (en) * 2008-07-30 2010-11-18 Saptari Vidi A Multiplex tunable filter spectrometer
EP2522984A2 (fr) * 2011-05-10 2012-11-14 Schlumberger Technology B.V. Procédé et appareil de surveillance et de gestion post-séquestration de dioxyde de carbone
EP2620761A1 (fr) 2012-01-30 2013-07-31 Ft System S.r.l. Groupe pour mesurer directement la quantité de dioxyde de carbone dissous dans un liquide contenu dans un récipient fermé

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110072801B (zh) * 2016-12-16 2021-10-26 百事可乐公司 用于碳酸软饮料设备的单罐碳酸化
CN110072801A (zh) * 2016-12-16 2019-07-30 百事可乐公司 用于碳酸软饮料设备的单罐碳酸化
US20190367350A1 (en) * 2016-12-16 2019-12-05 Pepsico, Inc. Single tank carbonation for carbonated soft drink equipment
WO2018112357A1 (fr) * 2016-12-16 2018-06-21 Pepsico, Inc. Carbonatation à réservoir unique pour équipement de boisson gazeuse non alcoolisée
US11787683B2 (en) * 2016-12-16 2023-10-17 Pepsico, Inc. Single tank carbonation for carbonated soft drink equipment
EP3673264B1 (fr) * 2017-08-24 2022-10-19 Steinfurth Mess-Systeme GmbH Dispositif et procédé correspondant d'analyse de nourriture dans des emballages
US11268942B2 (en) 2017-08-24 2022-03-08 Steinfurth Mess-Systeme GmbH Method of inspecting packages
CN111417852A (zh) * 2017-08-24 2020-07-14 斯丹佛测量系统有限责任公司 在食品包装中的检查方法
AT521681A4 (de) * 2018-11-09 2020-04-15 Acm Automatisierung Computertechnik Mess Und Regeltechnik Gmbh Labor-Gasmessgerät
AT521839A1 (de) * 2018-11-09 2020-05-15 Acm Automatisierung Computertechnik Mess Und Regeltechnik Gmbh Labor-Gasmessgerät
EP3650840A1 (fr) 2018-11-09 2020-05-13 ACM-Automatisierung, Computertechnik, Meß- und Regeltechnik GmbH Appareil de mesure des gaz de laboratoire
AT521681B1 (de) * 2018-11-09 2020-04-15 Acm Automatisierung Computertechnik Mess Und Regeltechnik Gmbh Labor-Gasmessgerät
WO2024037937A1 (fr) * 2022-08-18 2024-02-22 Wilco Ag Procédé et appareil pour mesurer une concentration d'une espèce gazeuse

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