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The BIRAL B1010 shape analysis instrument uses deviations from cylindrical symmetry of the light scattered by single aerosol particles to derive an asymmetry factor for each particle. Particle-size parameters and number counts are also obtained simultaneously. This information is graphically presented on a screen in real time. Changes in the ambient aerosol are observed visually by an operator...
The spatial analysis of scattered light patterns has been utilised to characterise the shape of airborne particles. The principles have been extensively tested using early prototype equipment. The light scattered from single particles is collected over a wide angular field and is optically transformed into a two-dimensional pattern. The cylindrical symmetry of this pattern is determined from the...
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