Device for measuring concentration of a gas

Optics: measuring and testing – Sample – specimen – or standard holder or support – Fluid containers

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Details

250343, 356437, 356440, G01N 2122

Patent

active

041903633

ABSTRACT:
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 is focused into the end of a tube the internal surface of which is highly polished or formed with a layer of material which is totally internally reflecting at the wavelength used and a radiation detector is located at 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 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.

REFERENCES:
patent: 3792272 (1974-02-01), Harte et al.
patent: 3997786 (1976-12-01), Lauer et al.

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