Abstract
The theory is reviewed with respect to 90° light scattering by finite-length cylinders with perpendicular incidence illumination, as a function of the roll angle formed by the cylinder axis and the scattering plane. This model is applied to the time-dependent scattering signal obtained from electrically aligned and oscillated fibers illuminated by a polarized and parallel laser beam. The theory indicates that the intensity of light scattered by discrete fibers, whose equilibrium axis is perpendicular to the scattering plane, varies with the roll angle depending on fiber length, and varies with the scattering angle depending on the fiber diameter and index of refraction. The optical configuration of a real-time fiber monitoring instrument is described within the above theoretical context, and examples of the scattering signals detected from discrete amosite asbestos fibers are presented and analyzed. A fiber length discrimination method is described and its theoretical model is compared with experimentally observed detection signals. The experimental observation of angular scattering asymmetries of amosite fibers is reported and interpreted. A signal-to-noise analysis, based on the extant instrument operating parameters, indicates the detection feasibility of asbestos fibers as small as 0.1 μm in diameter and 2 μm in length.
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