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

✍ Scribed by Marcus Breitenstein; Udo Kräuter; Ulrich Riebel

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 194 KB
• Volume: 16
• Category: Article
• ISSN: 0934-0866
• DOI: 10.1002/(sici)1521-4117(199912)16:6<249::aid-ppsc249>3.0.co;2-#

✦ Synopsis

The extinction of radiation in suspensions is traditionally described by the Bouger-Lambert-Beer law (BLBL). Based on a quasicontinuum 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 signi®cant ¯uctuations. The strength of ¯uctuation is related to the physical properties of the suspension and the process of spatial and tem-poral 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 ¯uctuation of the transmission signal.