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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 (Engelska)Ingår i: Journal of the Optical Society of America A, ISSN 0740-3232, Vol. 15, nr 6, s. 1689-1697Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
1998. Vol. 15, nr 6, s. 1689-1697
Nationell ämneskategori
Atom- och molekylfysik och optik Produktionsteknik, arbetsvetenskap och ergonomi
Identifikatorer
URN: urn:nbn:se:kth:diva-19422ISI: 000073756800023OAI: oai:DiVA.org:kth-19422DiVA, id: diva2:337575
Anmärkning
QC 20100806Tillgänglig från: 2010-08-06 Skapad: 2010-08-06 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
Ingår i avhandling
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
Öppna denna publikation i ny flik eller fönster >>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 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2009. s. xxv, 111
Serie
Trita-IIP, ISSN 1650-1888 ; 09:05
Nyckelord
Particle concentration, Particle size, Cylindrical particles, Large particles, Cellulose fibres, Wood pulp fibres, Suspensions, Particle length, Particle length distribution, Particle width
Nationell ämneskategori
Produktionsteknik, arbetsvetenskap och ergonomi
Identifikatorer
urn:nbn:se:kth:diva-10639 (URN)978-91-7415-254-8 (ISBN)
Disputation
2009-06-15, Sal M311, KTH, Brinellvägen 68,, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning
QC 20100806Tillgänglig från: 2009-06-09 Skapad: 2009-06-09 Senast uppdaterad: 2010-08-06Bibliografiskt granskad

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Journal of the Optical Society of America A
Atom- och molekylfysik och optikProduktionsteknik, arbetsvetenskap och ergonomi

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