Apparatus for determining the .sup.13 CO.sub.2 /.sup.12 CO.sub.2

Details Apparatus for determining the .sup.13 CO.sub.2 /.sup.12 CO.sub.2 Apparatus for determining the .sup.13 CO.sub.2 /.sup.12 CO.sub.2

1994-06-28

1995-12-26

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

G01N 2161

Patent

active

054790190

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.

REFERENCES:
patent: 4684805 (1987-08-01), Lee et al.
patent: 5146294 (1992-09-01), Grisar et al.
patent: 5317156 (1994-05-01), Cooper et al.

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