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Breath alcohol sampling system with spirometric client identity confirmation

  • US 9,192,324 B2
  • Filed: 06/27/2011
  • Issued: 11/24/2015
  • Est. Priority Date: 06/27/2011
  • Status: Active Grant
First Claim
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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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