Method of and apparatus for testing breath alcohol
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United States of America Patent
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Sep 13, 1988
Grant Date -
N/A
app pub date -
Jan 15, 1987
filing date -
Jan 15, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus for measuring breath alcohol content by oxidizing breath alcohol in a fuel cell and utilizing substantially all of the electrons produced by said oxidation as a measure of the amount of alcohol contained in the sample. A working embodiment of the invention includes a resistor across terminals of the fuel cell with a resistance that is high enough to permit the voltage from the fuel cell to be accurately measured but low enough to permit the voltage to fall to a substantially steady minimum voltage within a time on the order of two minutes or less. The method of measuring breath alcohol concentration comprises integrating the entire area under the curve generated by the fuel cell output voltage between the beginning of oxidation of the alcohol in the fuel cell and the reaching of the substantially steady minimum.
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