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Virtual water quality tests with an electionic tongue
Örebro universitet, Institutionen för teknik.
Örebro universitet, Institutionen för teknik.
2001 (engelsk)Inngår i: Proceedings of the 18th IEEE Instrumentation and measurement technology conference, 2001. IMTC 2001: Volume 2, 2001, Vol. 2, s. 1320-1324Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

The concept of the “electronic tongue” has been used in some experiments to establish the needs of fast and virtual monitoring of aqueous samples, e.g., in the monitoring of drinking water quality. More specifically, the performance of a proposed multi-electrode sensor system, used for voltammetric analysis of aqueous samples, is described. It is, for example, shown how such an “electronic tongue” can be used to monitor the quality of water in a production plant for drinking water. It is pointed out that conventional techniques often determine single concentration of the measured test while in many areas of measurement technology the methodology to extract adequate information from the environment, e.g., the electronic tongue, makes a total water quality estimate based on predetermined constraints extracted from complicated pattern structures. In this approach, experiments are conducted using an electronic tongue to virtually monitor the drinking water quality, measured from the raw water in the river to the tap water of the consumer. It can be shown that a system based on the proposed multi-electrode virtual sensor system is able to detect water quality changes. In these experiments, with the use of signal analysis and statistical multivariate methods we are able to estimate the water quality

sted, utgiver, år, opplag, sider
2001. Vol. 2, s. 1320-1324
HSV kategori
Forskningsprogram
Industriell mätteknik
Identifikatorer
URN: urn:nbn:se:oru:diva-3216DOI: 10.1109/IMTC.2001.928288ISBN: 0-7803-6646-8 (tryckt)OAI: oai:DiVA.org:oru-3216DiVA, id: diva2:137382
Konferanse
18th IEEE Instrumentation and measurement technology conference, IMTC 2001, 21-23 May 2001, Budapest, Hungary
Tilgjengelig fra: 2007-01-26 Laget: 2007-01-26 Sist oppdatert: 2017-10-18bibliografisk kontrollert
Inngår i avhandling
1. Electronic tongue for water quality assessment
Åpne denne publikasjonen i ny fane eller vindu >>Electronic tongue for water quality assessment
2007 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

This thesis describes the work on the development of a new electronic tongue for water quality assessment. The aim of this work is to build a complete system including a sensor and associated data analysis methods which is able to detect quality changes in drinking water and warn the user if the water is not suitable for drinking. Therefore, the main design issues were to build a portable, robust electronic tongue which provides a fast estimate of the water quality rather than identify the type of the contamination. In this sense, the system has a simple interface resembling traffic light signals. The system responds with green light for good water quality, red for bad quality and yellow if the result is uncertain.

The electronic tongue sensor is based on voltammetry, which gives a relatively simple and robust system. It is suitable for the considered applications, since it is able to measure small changes in the chemical and micro-organic content in water. These properties are very important for our goal to develop an electronic tongue for water quality assessment.

During the development process, the sensor system was modified in order to improve the system’s mobility and robustness. Moreover, the long-term stability and the extent of the sensor drift were evaluated for continuous use. The response time for the sensor is relatively short, but it generates large amounts of data. Therefore, there is a need for pre-processing and feature extraction methods to deal with the complexity of data. This is done with the help of multivariate analysis method. The quality assessment is done with different classification algorithms. We implemented fuzzy clustering and self-organizing maps.

In this thesis, two real applications are also considered, where the measurement is taking place in streaming water. In the first case, the electronic tongue could be placed directly at a water tap where random measurements occur. In the second application continuous measurements are performed and information about the sensor drift is used in the data analysis. The evaluation confirmed that the improved sensor system fulfills the requirements for on-line measurements of water quality.

sted, utgiver, år, opplag, sider
Örebro: Örebro universitetsbibliotek, 2007. s. 81
Serie
Örebro Studies in Technology, ISSN 1650-8580 ; 25
HSV kategori
Forskningsprogram
Industriell mätteknik
Identifikatorer
urn:nbn:se:oru:diva-870 (URN)91-7668-524-1 (ISBN)
Disputas
2007-02-16, Hörsal T, Fakultetsgatan 1, Örebro, 13:00
Opponent
Veileder
Tilgjengelig fra: 2007-01-26 Laget: 2007-01-25 Sist oppdatert: 2017-10-18bibliografisk kontrollert

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