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Theory of fluctuations in the regular transmittance through a dispersion of large cylindrical particles: extension to higher concentrations
1999 (English)In: Journal of the Optical Society of America A, ISSN 0740-3232, Vol. 16, no 11, 2737-2745 p.Article in journal (Refereed) Published
Abstract [en]

It has been shown in a previous paper [J. Opt. Sec. Am. A 15, 1689 (1998)] that the expected value and the Variance of the fluctuating regular transmittance through a dispersion of slender cylinders can be used to measure properties such as the size and concentration of the dispersed particles. The theory is valid, however, only for very low concentrations or very short path lengths. In practical applications, such as on-line applications, it is often desirable to work at higher concentration X path-length products p to avoid complicated sensor constructions. An extension of the previous theory toward higher values of p is presented. It is based on the assumption of the independence of the regular transmittance of parallel layers of the dispersion. The extended theory shows that information about the dispersion found in the expected Value and variance at very low values of p can also be obtained for higher values of p with a few simple expressions. Therefore applications possible in the case of low p values are also possible for higher p values. Two experimental examples have been included to facilitate the discussion of the theory presented.

Place, publisher, year, edition, pages
1999. Vol. 16, no 11, 2737-2745 p.
National Category
Production Engineering, Human Work Science and Ergonomics Production Engineering, Human Work Science and Ergonomics
Identifiers
URN: urn:nbn:se:kth:diva-19423ISI: 000083336300016OAI: oai:DiVA.org:kth-19423DiVA: diva2:337579
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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