liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Chemical Sensors and Multivariate Data Analysis
Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
2006 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Today, sensors can be found in many different applications, such as in home appliances, vehicles, medical equipments, mobile technology etc. Nearly all products with a reasonable technological height have a sensor integrated.

Chemical Sensors are devices able to sense the chemical environment and are today an active area of research. A great potential has been predicted for these kinds of sensors, meeting future demands of e.g. environmental monitoring, health-care issues and safety. The potential lies in the fact that chemical sensors are unspecific in general, responding to several different species in the ambient. By using several different sensors simultaneously a great portion of the chemical environment can be sensed at one instant.

The data generated when making measurements with multiple chemical sensors contain a lot of information, but t he information is not clearly visible and it is not easy to interpret the data as it is.

Along with the development of complex sensor systems comes the need for advanced data analysis procedures, able to interpret and visualize the information provided by the sensors. In this work, various aspects of data analysis procedures are discussed. Techniques for exploring large dataset are treated and a general overview is given on algorithms able to learn characteristic patterns within data. Difficult ies caused by unwanted sensor phen6mena such as drift and noise are identified and it is discussed how to counteract for these.

The thesis touches upon applications where chemical sensors are useful, and which requirements these applications put on the sensors and the data analysis procedures.

Work will be presented in which attempts have been made to learn the composition of flue gases produced by boilers used for heat and power production. It will be shown that it is possible roughly estimate the concentration of carbon monoxides, oxygen, and hydrocarbons by using a set of relatively in-expensive chemical sensors and by applying data analysis procedures. Work will also be presented in which it is discussed how to counteract for unintentional differences between sensor elements, a problem causing trouble prior to commercialization and mass-market production of chemical sensor systems.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet , 2006. , 48 p.
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1238
National Category
Natural Sciences
URN: urn:nbn:se:liu:diva-33743Local ID: 19785ISBN: 91-85497-37-1OAI: diva2:254566
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2013-11-12
List of papers
1. Initial studies on the possibility to use chemical sensors to monitor and control boilers
Open this publication in new window or tab >>Initial studies on the possibility to use chemical sensors to monitor and control boilers
2005 (English)In: Sensors and actuators. B, Chemical, ISSN 0925-4005, Vol. 111-112, 487-493 p.Article in journal (Refereed) Published
Abstract [en]

Small-scale boilers are quite often installed in facilities like schools, households and at local heat distributors. Because of economical considerations such boilers often lack appropriate control-systems, which results in inefficient and pollutant combustions with high levels of carbon monoxides, hydrocarbons, and in ashes with unburned charcoal. Monitoring of oxygen, carbon monoxide, and hydrocarbons, which is essential to be able to control a boiler, requires expensive instruments like flame-ionization detectors, IR- and mass-spectrometers.

We demonstrate the possibility to use a low-cost chemical sensor array to monitor a small-scaled boiler. By using metal oxide sensors, metal insulator silicon carbide field effect transistors, and by applying multivariate data modeling, promising results have been obtained. The data modeling was made using a joint approach based on blind source separations and multiple linear regressions. This approach showed similar result compared to results from the well-known PLSR algorithm.

Chemical sensor array, Pattern recognition, Combustion monitoring, Blind source separation, Canonical correlation analysis
National Category
Chemical Engineering
urn:nbn:se:liu:diva-14866 (URN)10.1016/j.snb.2005.03.045 (DOI)
Available from: 2008-09-29 Created: 2008-09-29 Last updated: 2013-11-12
2. Data driven approaches to characterizing cross-sensitive sensors and to improve calibration transer
Open this publication in new window or tab >>Data driven approaches to characterizing cross-sensitive sensors and to improve calibration transer
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Many different data analysis procedures can be developed for applications where chemical sensors are used, and it is sometimes even necessary to do so in order to get any reasonable results. Many of these procedures put certain demands on the used sensors, e.g. that they remain stable during operation. For this reason, it is useful to first learn the characteristics of a device before initiating developments of advanced procedures.

ln this paper, data driven modeling techniques are used to approximate sensor responses and cross sensitivity patterns. By keeping record of parameters in an adapted model structure the characteristics of a sensor can be extracted. The extracted information is valuable when developing analysis procedures.

The paper shows how the complexity of the calibration transfer problem increases when cross-sensitive sensors are used, and also shows a simple example of how the problem can be solved using application know-how for measurements using gas sensitive Metal-Insulator-Silicon-Carbide-Transistors. These procedures are simple and can be performed by sensor manufacturers to develop calibration transfer algorithms that reduce or eliminate the need of calibration measurements for the user.

calibration transfer, cross sensitivity, chemical sensors, pattern recognition
National Category
Engineering and Technology
urn:nbn:se:liu:diva-100824 (URN)
Available from: 2013-11-12 Created: 2013-11-12 Last updated: 2013-11-12

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Petersson, Henrik
By organisation
Applied PhysicsThe Institute of Technology
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 56 hits
ReferencesLink to record
Permanent link

Direct link