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Unobtrusive breath alcohol sensing system
Publication Type:
Conference/Workshop Paper
Venue:
The 24th International Technical Conference on the Enhanced Safety of Vehicles
Abstract
Although the vast majority of vehicle drivers are sober, drunk driving remains to be a major contributor to fatal
accidents. Massive deployment of unobtrusive breath alcohol sensing systems could potentially save tens of
thousands of lives worldwide every year by preventing drunk driving [1]. The work reported here is ultimately
aiming at such a system. The technical performance of the present sensing system with respect to automotive
requirements is summarized, and new results towards unobtrusive breath alcohol determination within vehicle
compartments are presented.
Breath alcohol concentration (BrAC) can be determined unobtrusively if (i) the sensing system provides real-time
signals with adequate accuracy corresponding to the local concentrations of both alcohol and a tracer gas, e g CO2,
(ii) the dilution of the breath is not excessive in relation to background concentrations, (iii) the sensor location can
be seamlessly integrated into the interior of a vehicle cabin. All three of these aspects are addressed in the present
paper.
More than a hundred prototypes based on infrared spectroscopy were fabricated and subjected to automotive
qualification tests in the full temperature range -40 … +85⁰C. In the majority of tests, adequate performance was
noted. Measures are now being taken to fill remaining performance gaps. Test results with human subjects were
positive and in accordance with expectations with respect to physiological variations. In-vehicle tests showed that
for the best sensor position, passive breath samples allowed BrAC to be determined at a resolution of 2-4% of the
US legal limit, providing proof-of-principle for unobtrusive testing. Nevertheless, vehicle integration remains to be
the major technological challenge to the objective of deployment on a large scale of unobtrusive driver breath
alcohol determination.
The feasibility of unobtrusive breath alcohol determination in vehicles, and adequate performance of a sensor
system based on infrared spectroscopy have been experimentally demonstrated. The alcohol sensing system may
advantageously be integrated into vehicles, and may also be combined with other technologies to monitor driver
impairment.
Bibtex
@inproceedings{Hok4103,
author = {Bertil H{\"o}k and H{\aa}kan Pettersson and Jonas Ljungblad},
title = {Unobtrusive breath alcohol sensing system},
month = {June},
year = {2015},
booktitle = {The 24th International Technical Conference on the Enhanced Safety of Vehicles},
url = {http://www.es.mdu.se/publications/4103-}
}