FI97643B - Mätanordning för mätning koncentrationen av en andningsgas av två våglängdstyp - Google Patents

Mätanordning för mätning koncentrationen av en andningsgas av två våglängdstyp Download PDF

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Publication number
FI97643B
FI97643B FI901007A FI901007A FI97643B FI 97643 B FI97643 B FI 97643B FI 901007 A FI901007 A FI 901007A FI 901007 A FI901007 A FI 901007A FI 97643 B FI97643 B FI 97643B
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FI
Finland
Prior art keywords
light
output
filter
detector
wavelength
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Application number
FI901007A
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English (en)
Finnish (fi)
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FI901007A0 (sv
FI97643C (sv
Inventor
Muneshige Kurahashi
Naoki Kato
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Nihon Kohden Corp
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Publication of FI901007A0 publication Critical patent/FI901007A0/sv
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Publication of FI97643B publication Critical patent/FI97643B/sv
Publication of FI97643C publication Critical patent/FI97643C/sv

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    • 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
    • G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Measuring devices for evaluating the respiratory organs
    • A61B5/083—Measuring rate of metabolism by using breath test, e.g. measuring rate of oxygen consumption
    • A61B5/0836—Measuring rate of CO2 production
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/16—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
    • G01J2001/161—Ratio method, i.e. Im/Ir
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/16—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
    • G01J2001/1678—Comparing time separated signals, i.e. chopped
    • G01J2001/1684—Comparing time separated signals, i.e. chopped and selecting also a DC level from the signal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/16—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
    • G01J2001/1678—Comparing time separated signals, i.e. chopped
    • G01J2001/1689—Comparing time separated signals, i.e. chopped one separated signal being processed differently
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/44—Electric circuits
    • G01J2001/444—Compensating; Calibrating, e.g. dark current, temperature drift, noise reduction or baseline correction; Adjusting
    • 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
    • G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
    • G01N2021/317—Special constructive features
    • 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

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  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Obesity (AREA)
  • Biomedical Technology (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Analytical Chemistry (AREA)
  • Emergency Medicine (AREA)
  • Chemical & Material Sciences (AREA)
  • Physiology (AREA)
  • Pulmonology (AREA)
  • Biophysics (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Claims (6)

1. Mätanording för mätning koncentrationen av en andningsgas av tvä väglängdstyp, vilken mätanordning om-5 fattar ett förbindelserör (2, 22), som är försett med en rörände (2a, 210), som är avsedd att hällas i tnunnen pä den person (1) som skall undersökas, och med en motsatt, öppen ände (2b, 220), och omfattande lufttäta fönster (3, 10 23) anordnade mellan förbindelserörets (2, 22) bägge än- dar; en ljuskälla (4, 24), som är lämpad för inriktning av en ljuskägla tili en ljusbana, som löper pä tvären ge-nom förbindelseröret (2, 22) via fönstren (3, 23); 15 ett första filter (7, 27), som tilläter genomgängen av en frän ljuskällan (4; 24) kommande ljuskomponent, vars väglängd är sädan att en given gas i andningsgasen som testpersonen (1) andats in i röret (2, 22) inte absorberar den, 20 ett andra filter (8, 28), som tilläter genomgängen av en frän ljuskällan (4; 24) kommande ljuskomponent, vars väglängd är sädan att den givna gasen inte absorberar den, organ (6; 26; 29) för turvis placering av det första filtret (7, 27) och det andra filtret (8, 28) pä ljus-25 banan; ljusdetekt or organ (10, 30) för omvandling av det genom filtren (7, 27; 8, 28) gäende ljuset tili en elekt-risk signal, varvid ljusdetektororganen (10, 30) omfattar en PbSe-infrarödsträlgivare; 30 första detektororgan (11, 31) för detektering av det första filtrets (7, 27) ljusutgäng ur den elektriska signalen; andra detektororgan (12, 32) för detektering av det andra filtrets (8, 28) ljusutgäng ur den elektriska signa-35 Ien; 16 97643 potensberäkningsorgan (13, 33) för beräknlng av potensen av de andra detektororganens (12, 32) utslgnal med ett exponentvärde m; divisororgan (14, 34) för divideringe av de första 5 detektororganens (11, 31) utsignal med de första potens- beräkningsorganens (13, 33) utgäng; kännetecknad av att ljuskällan (4; 24) sänder infrarödsträlar tili förbindelseröret (2; 22), ooh att det har anordnats: 10 likströmsdetektororgan (16, 36) för detektering av likströmsnivän hos den av ljusdetektororganen (10, 30) sända elektriska signalen, dä inga infrarödsträlar riktas mot den; andra potensberäkningsorgan (17, 37) för beräkning 15 av potensen av utsignalen frän likströmsnivädetektoror- ganens (16, 36) med ett exponentvärde 2(m-l); ooh multiplikatororgan (18, 38) för multiplicering av de andra potensberäkningsorganens (17, 37) utsignal med divisororganens (14, 34) utsignal; 20 varvid exponenten m representerar temperaturberoen- de koefficienter ai ooh a2, vilka motsvarar de första de-tektororganen (11, 31) ooh andra detektororganen (12, 32) och vilka är beräknade pä basis av de PbSe-infrarödsträl-givaren omfattande 1 jusdetektororganens (10, 31) exponen-25 tiellä resistansvariationer i förhällande tili temperatur- förändringar, varvid förhällandet mellan exponenten m och de temperaturberoende koefficienterna ai och a2 är: ai 30 m = — , a2 ljusdetektororganen (10, 30) matar en konstant spänning tili PbSe-infrarödgivaren och detekterar den genom infra-35 rödsträlgivaren gäende strömmens infrarödsträle som en detektorsignal. 17 97643
2. Anordning enligt patentkrav 1, känne-tecknad av att organen (6; 26; 29) för att turvis placering av det första filtret (7; 27) och det andra filtret (8; 28) pä ljusbanan omfattar en omvandlare (6; 5 26) som är försedd med det första filtret (7; 27) och det andra filtret (8; 28) anordnade mittemot varandra sä att de kan anordnas turvis pä ljusbanan.
3. Anordning enligt patentkrav 2, känne- tecknad av att omvandlaren (26) roteras med en 10 konstant varvperiod med hjälp av en motor (29).
4. Anordning enligt nägot av patentkraven 1-3, kännetecknad av att ljusdetektororganen (30) är av konstant-spänningstyp och försedda med en opera-tionsförstärkare (42), i vars ena ingäng den elektriska 15 signal som erhällits ur det inriktade ljuset inmatas.
5. Anordning enligt patentkrav 4, känne tecknad av att operationsförstärkarens (42) andra ingäng är jordad och ansluten tili en krets frän vilken en konstant likström har tillsatts.
6. Anordning enligt nägot av patentkraven 1-5, kännetecknad av att multiplikatorkretsen (38) är kopplad tili en logaritmförstärkare (35), som avger en utsignal som är proportionell mot koncentrationen hos ga-sen som skall undersökas.
FI901007A 1989-03-01 1990-02-28 Mätanordning för mätning koncentrationen av en andningsgas av två våglängdstyp FI97643C (sv)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4664989 1989-03-01
JP1046649A JPH02228943A (ja) 1989-03-01 1989-03-01 ２波長式呼吸ガス濃度測定装置

Publications (3)

Publication Number Publication Date
FI901007A0 FI901007A0 (sv) 1990-02-28
FI97643B true FI97643B (sv) 1996-10-15
FI97643C FI97643C (sv) 1997-01-27

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Application Number Title Priority Date Filing Date
FI901007A FI97643C (sv) 1989-03-01 1990-02-28 Mätanordning för mätning koncentrationen av en andningsgas av två våglängdstyp

Country Status (5)

Country Link
US (1) US4998018A (sv)
EP (1) EP0385256B1 (sv)
JP (1) JPH02228943A (sv)
DE (1) DE69021100T2 (sv)
FI (1) FI97643C (sv)

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Also Published As

Publication number Publication date
FI901007A0 (sv) 1990-02-28
US4998018A (en) 1991-03-05
JPH0346137B2 (sv) 1991-07-15
FI97643C (sv) 1997-01-27
EP0385256B1 (en) 1995-07-26
JPH02228943A (ja) 1990-09-11
EP0385256A3 (en) 1991-10-16
DE69021100T2 (de) 1996-04-18
EP0385256A2 (en) 1990-09-05
DE69021100D1 (de) 1995-08-31

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