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Fluctuations in the regular transmittance of dispersions of straight circular cylinders with a diameter much larger than the wavelength of the radiation
1998 (English)In: Journal of the Optical Society of America A, ISSN 0740-3232, Vol. 15, no 6, 1689-1697 p.Article in journal (Refereed) Published
Abstract [en]

The expected value and the variance of the regular transmittance of a dilute dispersion of slender straight circular cylinders with a diameter much larger than the wavelength of the radiation are studied theoretically in relation to the dimensions of the cylinders and the diameter of the radiation beam used. Both monodisperse and heterodisperse dispersions are considered. The study is Limited to two particle categories: (i) particles that are short and (ii) particles that are long but thin compared with the diameter of the radiation beam. The expected value is a function of concentration and particle diameter. The variance is proportional to the concentration. The variance is also proportional to particle length in the case of short particles but not in the case of long particles. The results explain interesting possibilities for the characterization of dispersions of large cylindrical particles shown earlier in industrial on-line applications.

Place, publisher, year, edition, pages
1998. Vol. 15, no 6, 1689-1697 p.
National Category
Atom and Molecular Physics and Optics Production Engineering, Human Work Science and Ergonomics
Identifiers
URN: urn:nbn:se:kth:diva-19422ISI: 000073756800023OAI: oai:DiVA.org:kth-19422DiVA: diva2:337575
Note
QC 20100806Available from: 2010-08-06 Created: 2010-08-06 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Particle Measurements Using Fluctuations in the Regular Transmittance of Light Through a Particle Dispersion: Concentration and Particles size - Theory, Measurement Principles and Applications for Pulp and Paper Production
Open this publication in new window or tab >>Particle Measurements Using Fluctuations in the Regular Transmittance of Light Through a Particle Dispersion: Concentration and Particles size - Theory, Measurement Principles and Applications for Pulp and Paper Production
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The regular transmittance of light or similar radiation through a flowing suspension of particles fluctuates because of the random occurrence of particles in the beam.In the work presented here, a theory for this fluctuating behaviour with the emphasison dispersions of mm-length slender cylindrical particles having circular crosssections is given. The particles in question are wood pulp fibres, which as a first approximation are considered to have a cylinder shape. Four possible measurementprinciples are described theoretically and experimentally. The four principles are for the measurement of concentration, length distribution characterized as lengthclasses, mean length, and mean width. The usefulness in industrial process monitoring of two of these principles is exemplified with pulp measurements. In order to estimate model errors, numerical simulations were used. Although other techniques such as image analysis may compete, the technique presented here is attractive because of the simplicity of the measurement device used.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. xxv, 111 p.
Series
Trita-IIP, ISSN 1650-1888 ; 09:05
Keyword
Particle concentration, Particle size, Cylindrical particles, Large particles, Cellulose fibres, Wood pulp fibres, Suspensions, Particle length, Particle length distribution, Particle width
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:kth:diva-10639 (URN)978-91-7415-254-8 (ISBN)
Public defence
2009-06-15, Sal M311, KTH, Brinellvägen 68,, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100806Available from: 2009-06-09 Created: 2009-06-09 Last updated: 2010-08-06Bibliographically approved

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