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Parametric modeling of wave propagation in gas mixtures: a system identification approach
LuleƄ University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
2005 (English)In: 2005 IEEE Ultrasonics Symposium: 18 - 21 September 2005, Rotterdam, the Netherlands, Piscataway, NJ: IEEE Communications Society, 2005, 2288-2292 p.Conference paper (Refereed)
Abstract [en]

In ultrasonic pulse-echo systems, the observable properties are restricted to frequency dependent attenuation and phase velocity, which in turn are related to the material properties of the investigated media. In this paper we present a parametric model of the bulk modulus, composed of the basic physical building blocks of absorption (relaxation blocks). The parametric model is capable of handling the combined effect of the absorption mechanisms present in a gas or gas mixture and captures the experimental variation in the observation. The performance of the parametric model is demonstrated with pulse-echo experiments in oxygen, ethane and mixtures of the two. Compared to standard Fourier analysis techniques, the parametric model gives higher accuracy when estimating attenuation and phase velocity, and physical parameters such as relaxation strengths and relaxation frequencies can be extracted from it.

Place, publisher, year, edition, pages
Piscataway, NJ: IEEE Communications Society, 2005. 2288-2292 p.
, I E E E International Ultrasonics Symposium. Proceedings, ISSN 1051-0117
Research subject
Signal Processing
URN: urn:nbn:se:ltu:diva-35662DOI: 10.1109/ULTSYM.2005.1603341Local ID: a4b11030-799f-11db-8824-000ea68e967bISBN: 0-7803-9382-1OAI: diva2:1008915
IEEE Ultrasonics Symposium : 18/09/2005 - 21/09/2005
Validerad; 2005; 20060921 (ysko)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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