JPS5716339A - Co2 densitometer - Google Patents

Co2 densitometer

Info

Publication number
JPS5716339A
JPS5716339A JP9055380A JP9055380A JPS5716339A JP S5716339 A JPS5716339 A JP S5716339A JP 9055380 A JP9055380 A JP 9055380A JP 9055380 A JP9055380 A JP 9055380A JP S5716339 A JPS5716339 A JP S5716339A
Authority
JP
Japan
Prior art keywords
light
connecting tube
window
voltage
testee
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.)
Pending
Application number
JP9055380A
Other languages
Japanese (ja)
Inventor
Muneshige Kurahashi
Shinji Yamamori
Takuo Aoyanagi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NIPPON KOUDEN KOGYO KK
Nippon Koden Corp
Original Assignee
NIPPON KOUDEN KOGYO KK
Nippon Koden Corp
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 NIPPON KOUDEN KOGYO KK, Nippon Koden Corp filed Critical NIPPON KOUDEN KOGYO KK
Priority to JP9055380A priority Critical patent/JPS5716339A/en
Publication of JPS5716339A publication Critical patent/JPS5716339A/en
Pending legal-status Critical Current

Links

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
    • G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
    • G01N21/274—Calibration, base line adjustment, drift correction

Landscapes

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

Abstract

PURPOSE:To enable the density of CO2 to be measured on the spot and eliminate the drift of measured values, by measuring the intensity of transmitted light through a transparent connecting tube set at the mouth of a testee. CONSTITUTION:The testee is requested to take the end of a connecting tube with an airtight window 3 of transparent sapphir etc. in his mouth. The light from a light source 4 passes through the window 3 and the breath in the connecting tube 2 and then it reaches a spectral filter 8 after the conversion of it into intermittent light by means of a light interrupter 6. After that, only the absorption wave-length of CO2 gas is converted photoelectrically by a detector 9. The signal thus converted is amplified by an amplifier 10 and after its rectification, it is applied to a logarithimic amplifier 12 to get output voltage Vc. As the output voltage Vc contains the fluctuation of the detection sensitivity of the detector and drift element due to the stain on the window 3, a voltage proportional to the density of CO2 is taken out from an output terminal 14 by applying the voltage at the time of suction through a base- cramp circuit 13.
JP9055380A 1980-07-04 1980-07-04 Co2 densitometer Pending JPS5716339A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9055380A JPS5716339A (en) 1980-07-04 1980-07-04 Co2 densitometer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9055380A JPS5716339A (en) 1980-07-04 1980-07-04 Co2 densitometer

Publications (1)

Publication Number Publication Date
JPS5716339A true JPS5716339A (en) 1982-01-27

Family

ID=14001592

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9055380A Pending JPS5716339A (en) 1980-07-04 1980-07-04 Co2 densitometer

Country Status (1)

Country Link
JP (1) JPS5716339A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51136474A (en) * 1975-05-06 1976-11-25 Siemens Ag Drift correcting apparatus for gas analyzer
JPS5459194A (en) * 1977-10-20 1979-05-12 Sankosha Co Ltd Gas leakage alarm

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51136474A (en) * 1975-05-06 1976-11-25 Siemens Ag Drift correcting apparatus for gas analyzer
JPS5459194A (en) * 1977-10-20 1979-05-12 Sankosha Co Ltd Gas leakage alarm

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