Highly accurate breath test system

  • US 11,143,646 B2
  • Filed: 12/11/2018
  • Issued: 10/12/2021
  • Est. Priority Date: 08/24/2012
  • Status: Active Grant
First Claim
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1. A system for testing air present from the breath of a person, the system comprising:

  • a sensor unit comprising;

    a chamber having an inlet and an outlet, the inlet being configured to receive into the chamber air present in the breath of a person and the outlet being configured to discharge from the chamber air present in the breath of a person;

    a plurality of sensor elements configured to (i) detect the concentration of a volatile substance present in air present in the chamber and to generate a signal corresponding to the concentration of the volatile substance present in air present in the chamber, and (ii) detect the concentration of a tracer gas present in air present in the chamber and to generate a signal corresponding to the concentration of the tracer gas present in air present in the chamber; and

    a fan for drawing air present in the breath of a person into the inlet of the chamber and for expelling air present in the breath of a person out of the chamber, the fan being configured to substantially prevent air from being expelled out of the outlet when the concentration of the tracer gas exceeds a predetermined threshold.

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