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A Light Scattering Instrument to Discriminate and Size Fibres Part 1: A theoretical description using the RGD approximation
Author(s) -
Jones Alan R.,
Savaloni Hadi
Publication year - 1989
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.19890060119
Subject(s) - mie scattering , rayleigh scattering , light scattering , cylinder , optics , spheres , scattering , physics , anisotropy , prolate spheroid , diffraction , orientation (vector space) , light scattering by particles , classical mechanics , geometry , mathematics , astronomy
As part of the development of a light scattering instrument to detect fibres, scattered light from finite cylinders which are exposed to light at arbitrary orientation is studied using the Rayleigh – Gans – Debye approximation. Form anisotropy, which is crucial to the performance of the instrument, is allowed for by using the Shifrin modification in which the elemental volumes are considered to be prolate spheroids. For long cylinders this is compared with van de Hulst's model in which the rigorous theory for an infinite cylinder is modified by Fraunhofer diffraction on the length. For very short cylinders comparison is made with the Mie theory for spheres.