Chemistry: analytical and immunological testing – Oxygen containing – Hydroxyl containing
Patent
1994-02-25
1994-12-27
Snay, Jeffrey R.
Chemistry: analytical and immunological testing
Oxygen containing
Hydroxyl containing
436133, 436900, 422 84, 128719, 73 233, G01N 2161, G01N 33497
Patent
active
053765559
ABSTRACT:
A method and infrared sensing device for determining the concentration of alveolar alcohol in a breath sample exhaled by a subject into an infrared sensing device. The presence of alcohol from the upper respiratory tract of the subject is detected by continuously monitoring alcohol and carbon dioxide, normalizing alcohol values with respect to carbon dioxide, calculating a difference between normalized alcohol concentration and carbon dioxide concentration over time, integrating (summing) the difference, and comparing the integrated difference with a threshold. This technique accurately and consistently detects the presence of mouth alcohol in the sample before the presence of carbon dioxide which originates in deep lung breath.
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Allen Roger
Braig James R.
Forrester Glenn C.
Goldberger Daniel S.
Herrera Roger
Intoximeters, Inc.
Snay Jeffrey R.
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