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Wood pulp characterization by a novel photoacoustic sensor
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.ORCID iD: 0000-0002-2833-2555
2012 (English)In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 23, no 8Article in journal (Refereed) Published
Abstract [en]

In this paper we introduce a novel photoacoustic sensing technique that captures a photoacoustic signal excited by a laser light pulse after the light has propagated through a turbid medium. Simultaneously, the ultrasonic sound wave is captured after it has propagated through the same turbid medium. By combining the two signals, more information on the investigated medium can be obtained. Applications can be found in the pulp and paper industry where monitoring wood pulp compositions is of interest. Depending on its origin, pulp suspension contains different compositions of fibres and fibre fragments (fines). Poor control of the pulp composition leads to an unstable process that compromises the production, quality and energy efficiency in the pulp mill. The result shows the feasibility of the photoacoustic sensor in monitoring the mass fractions of fibres and fines in a pulp suspension. The first received echo, corresponding to the light interaction with the sample, showed a stronger correlation to the fines mass fraction compared to fibre mass fraction. The second echo, corresponding to the sound wave interaction with the sample, showed a much stronger correlation to fibre mass fraction than to fines mass fraction. Hence, it is proposed that by combining these two echoes, more information about the pulp suspension could be extracted than from any other sensor built on a single sensing principle.

Place, publisher, year, edition, pages
2012. Vol. 23, no 8
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
URN: urn:nbn:se:ltu:diva-13303DOI: 10.1088/0957-0233/23/8/085607ISI: 000306366600050Scopus ID: 2-s2.0-84863846994Local ID: c8119de9-18cf-43af-9640-6904ee548548OAI: oai:DiVA.org:ltu-13303DiVA, id: diva2:986256
Projects
SCOPE Norra
Note
Validerad; 2012; Bibliografisk uppgift: Article no 085607; 20120606 (tlt)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2022-01-17Bibliographically approved

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Niemi, JanLöfqvist, Torbjörn

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