Breath alcohol sampling system with spirometric client identity confirmation
First Claim
1. An apparatus for monitoring alcohol in the breath of a test client, said apparatus comprising:
- a sample chamber receiving a breath sample during the exhalatory phase of a test client;
an alcohol sensor measuring the alcohol content of the breath sample from the sample chamber;
a spirometric sensor generating spirometric data over a test clients entire exhalatory phase from the same breath sample into the sample chamber;
a means for storing client characterization data based at least in part on the shape of the flow versus time curve of the exhalatory phase for a known client, wherein the client characterization data comprises a probability density in a phase space in which a first spirometric variable is correlated with at least a second spirometric variable; and
a processor analyzing spirometric data from the spirometric sensor and stored client characterization data to determine whether the test client is the known client.
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Accused Products
Abstract
An system for monitoring alcohol in the breath of a test client confirms the identity of the test client based on spirometric data. The system includes a sample chamber receiving a breath sample, an alcohol sensor measuring the alcohol content of the breath sample, and a spirometric sensor generating spirometric data from the breath sample over the test client'"'"'s entire exhalatory phase. A processor analyzes the spirometric data with stored client characterization data for a known client to confirm the identity of the test client. The client characterization data can be a probability density in a phase space in which at least two spirometric variables (e.g., flow and volume time-series data) are correlated.
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Citations
5 Claims
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1. An apparatus for monitoring alcohol in the breath of a test client, said apparatus comprising:
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a sample chamber receiving a breath sample during the exhalatory phase of a test client; an alcohol sensor measuring the alcohol content of the breath sample from the sample chamber; a spirometric sensor generating spirometric data over a test clients entire exhalatory phase from the same breath sample into the sample chamber; a means for storing client characterization data based at least in part on the shape of the flow versus time curve of the exhalatory phase for a known client, wherein the client characterization data comprises a probability density in a phase space in which a first spirometric variable is correlated with at least a second spirometric variable; and a processor analyzing spirometric data from the spirometric sensor and stored client characterization data to determine whether the test client is the known client. - View Dependent Claims (2)
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3. An apparatus for monitoring alcohol in the breath of a test client, said apparatus comprising:
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a sample chamber receiving a breath sample from a test client, said sample chamber having; (a) a diaphragm; (b) an inlet valve; and (c) an outlet valve having a flow resistance creating back pressure within the sample chamber in response to the breath sample, thereby resulting in movement of the diaphragm during the breath sample;
said inlet and outlet valves closing at the end of the breath sample to contain the breath sample within the sample chamber;an alcohol sensor measuring the alcohol content of the breath sample in the sample chamber; a spirometric sensor generating spirometric data by measuring movement of the diaphragm during the same breath sample; a means for storing client characterization data based at least in part on the shape of the flow versus time curve of the exhalatory phase for a known client, wherein the client characterization data comprises a probability density in a phase space in which a first spirometric variable is correlated with at least a second spirometric variable; and a processor analyzing spirometric data from the spirometric sensor and stored client characterization data to determine whether the test client is the known client. - View Dependent Claims (4, 5)
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Specification