WO1994020846A1 - Dispositif de mesure de melanges gazeux - Google Patents

Dispositif de mesure de melanges gazeux Download PDF

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Publication number
WO1994020846A1
WO1994020846A1 PCT/FI1994/000083 FI9400083W WO9420846A1 WO 1994020846 A1 WO1994020846 A1 WO 1994020846A1 FI 9400083 W FI9400083 W FI 9400083W WO 9420846 A1 WO9420846 A1 WO 9420846A1
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WO
WIPO (PCT)
Prior art keywords
measurement device
set forth
measurement
transducer
sample
Prior art date
Application number
PCT/FI1994/000083
Other languages
English (en)
Inventor
Raimo Erik Sepponen
Original Assignee
Increa Oy
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 Increa Oy filed Critical Increa Oy
Publication of WO1994020846A1 publication Critical patent/WO1994020846A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/74—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids

Definitions

  • This invention relates to an apparatus for determining an oxygen concentration of mixtures of gases based on exploitation of the paramagnetic properties of oxygen and which may be applied for example in measurements of concentration of oxygen in respiratory gases of a patient.
  • a device based on the description in the said publication has a short response time and in said publication one has described a construction of the measurement chamber which alleviates the drawbacks of the embodiments described in the publications DE 1648924 and US 3584499.
  • the magnetic field in the measurement chamber is generated with an electromagnet by supplying the winding for example an alternating electric current oscillating at 100 Hz. It is difficult to increase the oscillation frequency because losses in the core will lead to a strong heating of the core. This would also require a high excitation voltage over the coil winding. In generally the excitation of the transducer requires a relatively high power level, which leads to heating problems and thermal drift of the measurement unit. - Due to the above mentioned reasons one may not increase the switching speed much over 100 Hz, although herewith a better discrimination between the measurement signal and an error signal due to pressure variations could be obtained.
  • the invention avoids the drawbacks of the prior art and it is possible to realize a measurement device which is among other things easy to manufacture, small size, and do not consume a large amount of power and is easily to be joined to other measurement devices such as for example to a carbon dioxide meter.
  • a measurement device which is among other things easy to manufacture, small size, and do not consume a large amount of power and is easily to be joined to other measurement devices such as for example to a carbon dioxide meter.
  • this devices of the invention are characterized by what is set forth in the characterizing sections of the annexed claims.
  • Fig. 1 shows one embodiment of a measuring device of the invention.
  • Fig. 2 shows one embodiment of a measuring device of the invention in which there are pressure equalizing means between the measurement conduits.
  • Fig. 3 shows one embodiment of a measuring device of the invention.
  • Fig. 4 shows one embodiment of a measuring device of the invention including one solution for connection of a gas pump to the measurement device.
  • Fig. 5 shows block diagram of measurement electronics of one measurement device of the invention.
  • Fig. 6 shows construction of measurement device of the invention in which there is outlet space.
  • Fig. 7 shows a connection of the measurement device of the invention to another measurement device, such as for example to a carbon dioxide meter.
  • Fig. 8 shows connection of an active pressure equalizing means to measurement device of the invention.
  • a measurement device of the invention consists of a body CB where is conduit RT for reference gas RG, conduit MT for gas to be measured MG, in these conduits there are one or more flow resistance R for decreasing pressure variations.
  • RT and MT lead to measurement chamber MC, from where mixed MG and RG are conducted out through outlet conduit OT and outlet opening 0.
  • measurement transducer T Between RT and MT there is measurement transducer T, which detects differences in pressures in RT and MT.
  • MC and M move in respect to each other. In point of view of an outsider observer M may move or MC may move or both may move.
  • RG and MG are conducted via RT and MT in MC.
  • Over MC there is an alternating magnetic field, which is generated by magnetized object M which moves in respect to MC.
  • This alternating magnetic field attracts paramagnetic oxygen molecules with an alternating force.
  • This generates variations of pressures in RT and MT.
  • the amplitude of these pressure variations is dependent on the oxygen concentrations of RG and MG and herewith the respective differences in pressure variations may be used for measuring the oxygen concentration of MG in respect to that of RG.
  • the flow resistances or narrowings R serve for the same purpose in the pressure equalization circuits as described in the reference FI 73085.
  • Movement of M will be generated by means EM.
  • EM movement of M will be generated by means EM.
  • EM may also serve as a power source for gas pump GP. which sucks gases via conduits CT through the measuring device.
  • GP may be directly connected to 0 or CB may be totally or partially surrounded by a gas tight chamber, outlet chamber EV, in which gas mixture is flowing through 0, in the similar manner gases from buffer volume LC or other pneumatical damping circuits may flow in EV.
  • the signal of T is amplified by amplifier Al.
  • phase sensitive amplifier PD for example in such a manner that the signal from the magnetic field transducer C, which beneficially is placed in the close vicinity of MC, is conducted to PD.
  • the signal from C is to be amplified with amplifier A2 before it is conducted to PD.
  • the output signal of PD is conducted to the signal processing electronics. If necessary, it may be amplified with amplifier A3.
  • the necessary amplifiers and filters may be realized in many ways either as analogical or as digital.
  • the signal may be stored in memory devices, one may calculate characteristic indices based on it, trends and it may be used in controlling of various alarm or service functions.
  • the signal may also be brought directly or processed to display devices.
  • the signal which is led to the phase detector may be also generated by detecting for example optically motion of M.
  • An electromechanical solution may also be considered, in this solution motion of M affects a switch or a potentiometer.
  • One may also consider to detect the motion of M with a capacitive transducer.
  • M may be a barlike permanent magnet. It is one preferred embodiment for M to use meterial with magnetization as high as possible, such as for example magnet materials with so called rare earth substances.
  • magnets are manufactured among others by Magnequench, Division of General Motors, Anderson, IN, U.S.A., Outokumpu Magnets, Finland and Sumitomo Magnets, Japan.
  • M will be rotated by EM and this movemnent generates an alternating magnetic field over MC.
  • Pressure differences which are generated between MT and RT will be detected by T, which may be a simple electretmicrophone.
  • the signal for the phase sensitive amplifier will be generated by C, which may be so called Hall transducer or simply an induction coil.
  • EM may also serve as a power source for the gas pump GP.
  • damping means VS for which suitable materials and components are manufactured by for example E-A-R, Indianapolis, IN, U.S.A..
  • EM may also serve as a power source for a rotating chopper plate of a carbon dioxide transducer.
  • Chopper plate couples infrared beam emitted by carbon dioxide transducer to measurement cell and reference cell after each other. This combination which includes an oxygen transducer and carbon dioxide transducer is one preferred embodiment in a measurement device which is used in patient monitoring especially during anesthesia.
  • CP may be made from plastic for example by injection molding. This makes the measurement device low cost to manufacture. It is generally preferrable that the parts of the device near M do not include large electrically conductive surfaces, in this way generation of eddy currents is avoided.
  • gases in RT and MT observe magnetic field variations generated by the respective motion of M and MC as simultaneously and with as equal amplitudes as possible.
  • the structures presented in figures are not preferrable.
  • OT conducts gas mixture out from MC orthogonally to the plane of respective motions of M and MC.
  • RT and MT may run on the opposite sides of CB in such a manner that they are as symmetrical as possible in respect to the respective motions of M and MC. Symmetry should be as good as possible near MC and M.
  • the arrangements for pneumatical pressure equalization may be replaced with an active pressure equalizer APC, which compensates effectively pressure variations in conduits.
  • APC has been described in a parallel patent application "Pressure stabilizator"

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

L'invention concerne un dispositif de mesure de la concentration d'oxygène dans des mélanges gazeux. Le principe de fonctionnement dudit dispositif repose sur l'exploitation des propriétés paramagnétiques de l'oxygène. La chambre de mesure du dispositif et un objet magnétisés sont conçus pour être mobiles l'un par rapport à l'autre. Un champ magnétique variable génère des variations de pression dans des conduites d'échantillon de gaz et de gaz de référence raccordées à la chambre de mesure, lesdites variations de pressions étant détectées avec, par exemple, un microphone.
PCT/FI1994/000083 1993-03-08 1994-03-08 Dispositif de mesure de melanges gazeux WO1994020846A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI931009 1993-03-08
FI931009A FI931009A (fi) 1993-03-08 1993-03-08 Kaasuseosten mittaamiseen tarkoitettu mittalaite

Publications (1)

Publication Number Publication Date
WO1994020846A1 true WO1994020846A1 (fr) 1994-09-15

Family

ID=8537509

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1994/000083 WO1994020846A1 (fr) 1993-03-08 1994-03-08 Dispositif de mesure de melanges gazeux

Country Status (2)

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FI (1) FI931009A (fr)
WO (1) WO1994020846A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006094285A2 (fr) * 2005-03-04 2006-09-08 Global Tech International, Inc. Procedes de traitement de surface incluant la metallisation, dispositif servant a executer ces procedes et articles produits au moyen de ces derniers
EP2330417A3 (fr) * 2009-12-03 2012-01-04 General Electric Company Système et procédé permettant de mesurer la concentration d'un gaz paramagnétique
JP2015049219A (ja) * 2013-09-04 2015-03-16 富士電機株式会社 磁気式酸素分析計
JP2015049220A (ja) * 2013-09-04 2015-03-16 富士電機株式会社 磁気式酸素分析方法及び磁気式酸素分析計
JP2015059848A (ja) * 2013-09-19 2015-03-30 富士電機株式会社 磁気式酸素分析計及び磁気式酸素分析計用センサユニット
WO2022141320A1 (fr) * 2020-12-30 2022-07-07 深圳迈瑞生物医疗电子股份有限公司 Dispositif de mesure de gaz paramagnétique et système de ventilation médicale

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584499A (en) * 1967-08-31 1971-06-15 Hartmann & Braun Ag Quick response oxygen analyser
GB2184845A (en) * 1985-12-19 1987-07-01 Draegerwerk Ag Device for determining the proportion of substances with paramagnetic properties in a mixture of substances
DE3716762A1 (de) * 1986-05-27 1987-12-03 Brueel & Kjaer As Vorrichtung zur bestimmung der konzentration eines paramagnetischen gases durch messen des gasdrucks unter einfluss eines wechselstrommagnetfelds
DE3840337C1 (fr) * 1988-11-30 1989-11-02 Draegerwerk Ag, 2400 Luebeck, De
WO1989012821A1 (fr) * 1988-06-20 1989-12-28 Servomex (Uk) Limited Appareil de detection de gaz

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584499A (en) * 1967-08-31 1971-06-15 Hartmann & Braun Ag Quick response oxygen analyser
GB2184845A (en) * 1985-12-19 1987-07-01 Draegerwerk Ag Device for determining the proportion of substances with paramagnetic properties in a mixture of substances
DE3716762A1 (de) * 1986-05-27 1987-12-03 Brueel & Kjaer As Vorrichtung zur bestimmung der konzentration eines paramagnetischen gases durch messen des gasdrucks unter einfluss eines wechselstrommagnetfelds
WO1989012821A1 (fr) * 1988-06-20 1989-12-28 Servomex (Uk) Limited Appareil de detection de gaz
DE3840337C1 (fr) * 1988-11-30 1989-11-02 Draegerwerk Ag, 2400 Luebeck, De

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006094285A2 (fr) * 2005-03-04 2006-09-08 Global Tech International, Inc. Procedes de traitement de surface incluant la metallisation, dispositif servant a executer ces procedes et articles produits au moyen de ces derniers
WO2006094285A3 (fr) * 2005-03-04 2009-04-16 Global Tech International Inc Procedes de traitement de surface incluant la metallisation, dispositif servant a executer ces procedes et articles produits au moyen de ces derniers
EP2330417A3 (fr) * 2009-12-03 2012-01-04 General Electric Company Système et procédé permettant de mesurer la concentration d'un gaz paramagnétique
US8220311B2 (en) 2009-12-03 2012-07-17 General Electric Company System and method for measuring concentration of a paramagnetic gas
JP2015049219A (ja) * 2013-09-04 2015-03-16 富士電機株式会社 磁気式酸素分析計
JP2015049220A (ja) * 2013-09-04 2015-03-16 富士電機株式会社 磁気式酸素分析方法及び磁気式酸素分析計
JP2015059848A (ja) * 2013-09-19 2015-03-30 富士電機株式会社 磁気式酸素分析計及び磁気式酸素分析計用センサユニット
WO2022141320A1 (fr) * 2020-12-30 2022-07-07 深圳迈瑞生物医疗电子股份有限公司 Dispositif de mesure de gaz paramagnétique et système de ventilation médicale

Also Published As

Publication number Publication date
FI931009A0 (fi) 1993-03-08
FI931009A (fi) 1994-09-09

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