Apparatus for measuring the concentration of gases

Details Apparatus for measuring the concentration of gases Apparatus for measuring the concentration of gases

1979-02-12

1980-10-14

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

356440, G01J 100, G01N 2100

Patent

active

042283523

ABSTRACT:
A tubular measuring chamber (3) is described for temporarily holding alveolar breath for determining the quantity of alcohol in the breath of infra red radiation absorption. The radiation path length between an I.R. source (1, 2) and a condenser lens (7) and detector (8) is made a multiple of the actual length of the tube by bending the tube in any convenient way e.g. a helix (FIG. 1 and FIG. 3), a serpentine (FIG. 2), or meanderingly with definite bends (FIGS. 4-7).
The internal surface of the tube (3) is made highly reflective to I.R. and plane reflectors (10) are located at definite bends in the tube or between different sections of tube (see FIGS. 4-7), to deflect radiation from one tube section to the next.
A saliva trap and mouthpiece (6) to receive the breath is connected mid-way along the tube (3) between the radiation source (1, 2) and condenser (7).

REFERENCES:
patent: 2212211 (1940-08-01), Pfund
patent: 3319071 (1967-05-01), Werth et al.
patent: 3792272 (1974-02-01), Harte et al.
patent: 3997786 (1976-12-01), Lauer et al.

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