G - Physics – 01 – N
Patent
G - Physics
01
N
73/114
G01N 1/22 (2006.01) G01N 21/05 (2006.01)
Patent
CA 1077298
ABSTRACT OF THE DISCLOSURE A device for measuring concentration of a gas adapted to be used for measuring the concentration of alcohol molecules in exhaled breath. The device relies for its operation on the known phenomenon that radiation is absorbed by different materials at different characteristic wavelengths. Radiation of a wavelength which will be absorbed by the gas to be tested the opposite end of the tube. Partly to increase the path length by causing many internal reflections to occur and partly to reduce the overall size of the device, the tube is curved either in the form of a helix with constant or varying radius of curvature or is curved first one way and then the next in a serpentine fashion. Gas whose concentration is to be measured is introduced through a side tube which includes a saliva trap if to be used for measuring alcohol molecule concentration in exhaled breath. The source of radiation comprises an ellipsoidal quartz-halogen lamp of the type which is vacuum-coated with gold. - 1-
280430
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