Open AccessThe scattering of light by turbid media.–Part II
Author(s) -
J. W. Ryde,
Bridgette Cooper
Publication year - 1931
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1931.0065
Subject(s) - optics , refractive index , diffuse reflection , scattering , particle (ecology) , absorption (acoustics) , light scattering , reflection (computer programming) , suspension (topology) , attenuation coefficient , transmission (telecommunications) , ray , materials science , reflection coefficient , physics , computational physics , mathematics , oceanography , electrical engineering , engineering , homotopy , pure mathematics , computer science , programming language , geology
In Part I it was shown how the values of the transmission and reflection of a sheet of a medium containing particles in suspension can he calculated. First the amounts of light scattered in the forward and forward directions from a single particle were determined; from these results the transmission 1 and rejection R for diffuse incident light were found for a layer of the disusing medium, when the effects of boundary reflections are negligible. At this stage, the expressions developed apply to a mist or fog consisting of particles suspended in air. Finally it was shown how, if the particles are suspended in some other medium, having a different refractive index from that of air, the transmission and reflectionז andp can be expressed in terms of T and R and the surface rejection coefficients. The more general expressions, for the case when the incident light is a parallel beam, were also developed. We shall now show how the absorption coefficientμ can be determined from photometric observations. As a check on the theory, we shall deduce the diameter D of the particles and the number N present per unit volume and compare these calculated values with those found by direct observation, Finally, the necessary modifications of the theory will be made to cover the case when the diffusing medium is in the form of a spherical shell.