An in situ light-scattering method to discriminate between fibrous and nonfibrous airborne material

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Abstract
A light-scattering technique has been developed to discriminate between fibrous and nonfibrous airborne particulate matter. No sampling is required and the method is intrinsically independent of fibre orientation in the plane orthogonal to the incident light beam. Calculations indicate that the method may also work satisfactorily even for fibres at almost end-on incidence. A modification of the method is described which simultaneously monitors particle velocity. This is essential if the fibre concentration is to be measured.