International Journal of Automotive Engineering
Online ISSN : 2185-0992
Print ISSN : 2185-0984
ISSN-L : 2185-0992
Technical Paper
Portable Alcohol Detection Device with Breath Recognition for Smart Keys
- Evaluation of Sensor Unit for Portable Device -
Hironori WakanaMasuyoshi YamadaMinoru Sakairi
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2019 Volume 10 Issue 1 Pages 20-25


We have developed a portable breath-based alcohol detection device that can easily determine whether a person has consumed alcohol. The device consists of a sensor to detect saturated water vapor in human breath and three semiconductor gas sensors to detect ethanol, acetaldehyde, and hydrogen. The device can determine whether the gas introduced into it is human exhaled breath and can detect the alcohol level at the same time. This ensures that the sample is of a person’s breath, not an artificial source. The selected gas sensors exhibited low relative standard deviation (RSD) for the repeated measurements. Each gas concentration is calculated using an algorithm based on a differential evolution method with a measurement accuracy of approximately ±5 ppm. These functions can be integrated into a smart key.

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© 2019 Society of Automotive Engineers of Japan, Inc
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