Title:
A method and a device for measuring respiratory alcohol concentration
Document Type and Number:
Japanese Patent JP6023075
Kind Code:
B2
Abstract:
The present invention relates to a method and apparatus for measuring breath alcohol concentration of a user. A flow of an expired breath sample is passed through a fuel cell sensor giving an output signal proportional to the amount of alcohol present in the breath sample. By measuring the flow rate, the volume of the breath sample may be calculated, whereas the breath alcohol concentration is calculated based on the fuel cell output signal. Both the sample volume and the breath alcohol concentration values are continually updated by integrating the measured instantaneous flow rate and the fuel cell output signal over time. If the user stops blowing, flow compensation is performed to obtain a compensated fuel cell output signal using a stored calibration volume. Hence, an improved method for accurately measuring the breath alcohol concentration of a test person is achieved, capable of handling varied expired volumes of breath, which obviates the need for a sampling mechanism.
Inventors:
Evans, Nigel
Warrington, Lee
Warrington, Lee
Application Number:
JP2013546067A
Publication Date:
November 09, 2016
Filing Date:
December 20, 2010
Export Citation:
Assignee:
ALCO SYSTEMS SWEDEN AB
International Classes:
G01N27/416; B60K28/06; G01N1/02; G01N27/26; G01N33/497; G01N33/98
Domestic Patent References:
| JP2004522944A | ||||
| JP2006201097A | ||||
| JP2012524267A | ||||
| JP2009518063A | ||||
| JP2004501374A | ||||
| JP2010139319A |
Foreign References:
| CA2552130A1 | ||||
| US4770026 | ||||
| US5612896 | ||||
| US20030183437 | ||||
| US7422723 | ||||
| US20100268106 | ||||
| US20070245801 |
Attorney, Agent or Firm:
Makoto Onda
Hironobu Onda
Atsushi Honda
Hironobu Onda
Atsushi Honda