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Unobtrusive and Highly Accurate Breath Alcohol Analysis Enabled by Improved Methodology and Technology
Hök Instrument AB, Sweden.
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. Hök Instrument AB, Sweden.ORCID iD: 0000-0003-3286-2572
Hök Instrument AB, Sweden.
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.ORCID iD: 0000-0002-5832-5452
Show others and affiliations
2014 (English)In: Journal of Forensic Investigation, ISSN 2330-0396, Vol. 2, no 4, p. 1-8Article in journal (Refereed) Published
Abstract [en]

The study objective was to evaluate a novel method and technology for unobtrusive determination of breath alcohol in relation to current industrial accuracy standards. The methodology uses carbon dioxide as a tracer gas detected by sensor technology based on infrared spectroscopy. Part one of the investigation was to analyse the performance of hand-held prototype devices and included tests of resolution, unit-to-unit variation during calibration, response to alcohol containing gas pulses created with a wet gas simulator, and cross sensitivity to other substances. In part two of the study, 30 human participants provided 1465 breath tests in both unobtrusive and obtrusive use modes. The results of both parts of the study indicate that the prototype devices exceeded present industrial accuracy requirements. The proposed methodology and technology eliminate the previous contradiction between unobtrusiveness and high accuracy.

Place, publisher, year, edition, pages
2014. Vol. 2, no 4, p. 1-8
Keywords [en]
Breath alcohol analysis, Infrared spectroscopy, Accuracy, Unobtrusiveness
National Category
Engineering and Technology Medical Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-28102DOI: 10.13188/2330-0396.1000016OAI: oai:DiVA.org:mdh-28102DiVA, id: diva2:818245
Projects
ITS-EASY Post Graduate School for Embedded Software and SystemsESS-H - Embedded Sensor Systems for Health Research ProfileAvailable from: 2015-06-08 Created: 2015-06-08 Last updated: 2017-10-04Bibliographically approved
In thesis
1. High Performance Breath Analysis
Open this publication in new window or tab >>High Performance Breath Analysis
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Alcohol breath testing on a larger scale will save lives. Alcohol abuse is a major contributor to death and disease. Alcohol intake affects the human body by significantly longer response time to external stimuli. In situations where the senses need to be on alert this delay can be the difference between life and death. To make the alcohol breath test more available in everyday use, the mouthpiece has been removed. Instead, the exhaled alcohol is measured directly in a diluted sample. The dilution can be accounted for by simultaneous measurement of an endogenous tracer gas. Because of the lack of a mouthpiece several additional factors influence the alcohol measurement, e.g. the obvious lower abundance of analyte gas, shorter time of analysis and physiological aspects of the tracer gas. My studies include sensor development and validation through laboratory experiments as well as human subject studies. Several sensor parameters are crucial for the functionality of the alcohol detection system and are in need of careful investigation. Human behaviour and physiology also needs further understanding. A better understanding of the system provides vital knowledge for the design of smarter algorithms. Planning, conducting and evaluation of these studies lie within the scope of the licentiate thesis.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2016. p. 87
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 225
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electronics
Identifiers
urn:nbn:se:mdh:diva-29883 (URN)978-91-7485-249-3 (ISBN)
Presentation
2016-01-28, Delta, Mälardalens högskola, Västerås, 09:15 (English)
Opponent
Available from: 2015-12-11 Created: 2015-12-09 Last updated: 2017-01-03Bibliographically approved
2. High performance breath alcohol analysis
Open this publication in new window or tab >>High performance breath alcohol analysis
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Alcohol breath testing on a larger scale will save lives. Alcohol intake affects the human body by significantly longer response time to external stimuli. In demanding situations where the senses need to be on alert a prolonged reaction time can be the difference between life and death, both for the intoxicated subject and for surrounding  individuals.

The aims of this thesis include investigations of a new type of breath alcohol sensor, designed for operation without a mouthpiece, both with regards to sensor performance as well as usability in relation to various breath  alcohol  screening applications.

In many situations where breath alcohol screening is suitable, there is a need for quick and easy use. The instrument should interfere as little as possible with the regular routines and procedures. One such task is driving. To accommodate for these needs in an in-vehicle application, the breath alcohol sensing system must be seamlessly installed in the vehicle and not interfere with the normal behavior of the sober driver. Driving is also a task requiring high level of concentration over a prolonged period of time. In the U.S. alone thousands of lives are annually lost in accidents where the driver was under the influence of  alcohol.  Similar numbers have been recorded for Europe. The potential for a system handling the needs for ease-of-use is huge and may result in successful products.

The results presented within this thesis provide experimental evidence of sufficient sensor performance for screening applications with an instrument operating without a mouthpiece. Smarter calculation methods were also shown to be a feasible path to improved measurement reliability. Important steps towards an even more passive solution for in-vehicle screening is also presented. Experiments showed that given enough time and sensor resolution, passive alcohol detection systems are feasible.

Place, publisher, year, edition, pages
Västerås: Malardalen University Press, 2017
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 240
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electronics
Identifiers
urn:nbn:se:mdh:diva-36634 (URN)978-91-7485-350-6 (ISBN)
Public defence
2017-11-15, Delta, Mälardalens högskola, Västerås, 09:15 (English)
Opponent
Supervisors
Available from: 2017-10-04 Created: 2017-10-04 Last updated: 2017-10-12Bibliographically approved

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Publisher's full texthttp://www.avensonline.org/wp-content/uploads/2014/11/JFI-2330-0396-02-0016.pdf

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Ljungblad, JonasEkström, Mikael

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