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Breath alcohol analyzer

  • US 4,809,810 A
  • Filed: 05/01/1986
  • Issued: 03/07/1989
  • Est. Priority Date: 05/01/1986
  • Status: Expired due to Term
First Claim
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1. An apparatus having components for analyzing a breath sample delivered by a subject, the apparatus comprising:

  • (a) a transducer formed and positioned for sensing at least the temperature, the pressure and the humidity of the breath sample, the transducer in response generating a breath signature signal;

    (b) a sensor formed and positioned for sensing an alcohol concentration level if any carried by the breath sample, the sensor in response generating an alcohol signal;

    (c) a breath reference, representing a valid common range of breath signature signals of at least the temperature, the pressure and the humidity of a plurality of typical breath samples taken from a reference population of subjects;

    (d) an alcohol reference representing a common range of alcohol concentration levels in a typical subject'"'"'s blood correlated with a common range of alcohol concentration levels contained in the subject'"'"'s breath sample, the alcohol reference including an alcohol threshold value which one of (i) if not exceeded corresponds to a passing breath sample and (ii) if equaled or exceeded corresponds to a failing breath sample;

    (e) a first means for comparing the breath signature signal with the breath reference and providing as an output signal the information that one of (i) the breath sample is valid because the breath signature signal substantially matches the respective corresponding values in the breath reference and (ii) the breath sample is invalid because the breath signature does not substantially match the respective corresponding values in the breath reference; and

    (f) a second means for comparing the alcohol signal with the alcohol reference and providing as an output signal the information that one of (i) the breath sample is passing because the alcohol signal is less than the alcohol threshold value and (ii) the breath sample is failing because the alcohol signal is equal to or greater than the alcohol threshold value.

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