Method and apparatus for determining alcohol concentration in the blood
First Claim
1. A method of determining the alcohol concentration in the blood of a person by testing a person'"'"'s breath, comprising, maintaining at least a minimum flow rate for the person'"'"'s breath, measuring the alcohol amount in the test sample, measuring an increase in humidity in the test sample over an ambient humidity in the air, and determining the ratio between the alcohol amount and the increase in humidity to obtain a value which is proportional to the alcohol concentration in the blood of the person.
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Abstract
A method and apparatus for determining the alcohol concentration in the blood of a person by testing the person'"'"'s breath, including, maintaining at least a minimum flow rate for the person'"'"'s breath to form a test sample of the breath, measuring the alcohol amount in the test sample, measuring the increase in humidity in the test sample over ambient humidity and finding the ratio between the alcohol amount and the increase in humidity. This ratio is proportional to the actual alcohol concentration in the person'"'"'s blood and cannot be disquised by a person wishing to falsify the results of the test.
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Citations
13 Claims
- 1. A method of determining the alcohol concentration in the blood of a person by testing a person'"'"'s breath, comprising, maintaining at least a minimum flow rate for the person'"'"'s breath, measuring the alcohol amount in the test sample, measuring an increase in humidity in the test sample over an ambient humidity in the air, and determining the ratio between the alcohol amount and the increase in humidity to obtain a value which is proportional to the alcohol concentration in the blood of the person.
- 6. An apparatus for determining the alcohol concentration in the blood of a person by testing the person'"'"'s breath, comprising, a breathing tube for receiving a flow of the person'"'"'s breath, alcohol and water-sensing means connected to said breathing tube for sensing an amount of alcohol in the breath and an increase in humidity in the breath over an ambient humidity in the air, and circuit means connected to said alcohol and water-sensing means for producing the ratio between the amount of alcohol and the increase in humidity which is proportional to the alcohol concentration in the blood of the person.
Specification