Chemistry: analytical and immunological testing – Oxygen containing – Inorganic carbon compounds
Patent
1997-03-12
1999-06-01
Soderquist, Arlen
Chemistry: analytical and immunological testing
Oxygen containing
Inorganic carbon compounds
436127, 436134, 436145, 436164, 436171, 25033912, 25033913, 250343, 25033901, 25033906, 356418, 356435, 356437, 422 8209, 422 83, G01N 3300, G01N 2101, G01N 2131, G01N 2135
Patent
active
059087897
ABSTRACT:
The invention relates to a method and apparatus for determining the concentration of at least carbon dioxide in a gas mixture on the basis of the absorption of infrared radiation (2), said apparatus comprising: a radiation source (1), the radiation emitted thereby being aligned to travel through a measuring cell (4) containing a gas mixture (6) to be analyzed; an optical band-pass filter (10), which is transmissive to a first wavelength band and positioned on the path of radiation emerging from the measuring cell or entering into the measuring cell through which the radiation passes; and a first detector (14), positioned in the radiating direction downstream of said first band-pass filter and used for detecting the radiation intensity falling thereon. Said optical band-pass filter (10) has a band-pass which lies within the wavelength range of 4.38 .mu.m-4.47 .mu.m for measuring the total concentration of carbon dioxide by means of the absorption spectrum of a molecule .sup.13 CO.sub.2 produced by a carbon isotope .sup.13 C.
REFERENCES:
patent: 3790798 (1974-02-01), Sternberg et al.
patent: 3832548 (1974-08-01), Wallack
patent: 3968367 (1976-07-01), Berg
patent: 4013260 (1977-03-01), McClatchie et al.
patent: 4233513 (1980-11-01), Elder et al.
patent: 4567366 (1986-01-01), Shinohara
patent: 4891518 (1990-01-01), Day
patent: 4914719 (1990-04-01), Conlon et al.
patent: 5081998 (1992-01-01), Yelderman et al.
patent: 5092342 (1992-03-01), Hattendorff et al.
patent: 5429805 (1995-07-01), Uno et al.
patent: 5464982 (1995-11-01), Drucker et al.
patent: 5479019 (1995-12-01), Gross
patent: 5486699 (1996-01-01), Fabinski et al.
patent: 5610400 (1997-03-01), Weckstrom
Instrumentarium Oy
Soderquist Arlen
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