Apparatus for determining the .sup.13 CO.sub.2 /.sup.12 CO.sub.2 ratio of concentrations in a gas sample
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United States of America Patent
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-
Dec 26, 1995
Grant Date -
N/A
app pub date -
Jun 28, 1994
filing date -
Jul 13, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A measuring apparatus based on the NDIR process. Pulsed infrared light traverses in two parallel optical beams (3, 4) initially a cell (6) filled with .sup.13 CO.sub.2 and a cell (7) filled with .sup.12 CO.sub.2 and then, in parallel, two cells (8, 9) which are filled with the gas sample to be analyzed. Cells (8, 9) together with a capacitor microphone (15) serving as the pressure converting means form an optopneumatic receiver (17). By regulating the pressure in cell (6) the minimum of the pressure conversion signal is investigated and related to a correspondingly obtained reference value. The simply constructed apparatus permits a .sup.13 CO.sub.2 breathing test to be performed inexpensively.
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