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Article

The Fundamentals of Particle Size Analysis by Transmission Fluctuation Spectrometry. Part 1: A Theory of Temporal Transmission Fluctuations in Dilute Suspensions

  1. Marcus Breitenstein1,
  2. Udo Kräuter2,
  3. Ulrich Riebel1

Article first published online: 3 FEB 2000

DOI: 10.1002/(SICI)1521-4117(199912)16:6<249::AID-PPSC249>3.0.CO;2-#

Issue

Particle & Particle Systems Characterization

Particle & Particle Systems Characterization

Volume 16, Issue 6, pages 249–256, December 1999

Additional Information

How to Cite

Breitenstein, M., Kräuter, U. and Riebel, U. (1999), The Fundamentals of Particle Size Analysis by Transmission Fluctuation Spectrometry. Part 1: A Theory of Temporal Transmission Fluctuations in Dilute Suspensions. Part. Part. Syst. Charact., 16: 249–256. doi: 10.1002/(SICI)1521-4117(199912)16:6<249::AID-PPSC249>3.0.CO;2-#

Author Information

  1. 1

    Dipl.-Phys. M. Breitenstein, Prof. Dr.-Ing. U. Riebel, Lehrstuhl Mechanische Verfahrenstechnik, Brandenburgische Technische Universität Cottbusl, D-03013 Cottbus (Germany).

  2. 2

    Dr.-Ing. U. Kräuter, Bayer AG, D-51368 Leverkusen (Germany).

Publication History

  1. Issue published online: 3 FEB 2000
  2. Article first published online: 3 FEB 2000
  3. Manuscript Received: 20 AUG 1999

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Abstract

The extinction of radiation in suspensions is traditionally described by the Bouger-Lambert-Beer law (BLBL). Based on a quasi-continuum approach, the BLBL does not account for the discrete nature of particles or their spatial extension and arrangement. If an extinction measurement is made with a high spatial and temporal resolution, the transmitted intensity signal shows significant fluctuations. The strength of fluctuation is related to the physical properties of the suspension and the process of spatial and temporal averaging. Exploiting this connection, it is possible to calculate the particle size distribution and the particle concentration from transmission measurements. This part of the series of papers provides a method for the temporal decomposition of the transmission's power spectrum, which permits the information on the particle size and concentration to be extracted from the seemingly irregular fluctuation of the transmission signal.

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