Principles of in-situ measurement of mass concentration of chain-like aerosol particle were presented based on the dynamic light scattering for aggregated particles and a fuzzy set. The method was checked and evaluated experimentally with chain-like lead aerosol particles and their mass equivalent spherical particles. The experiment made it clear that the principles are generally feasible, and more profound and careful study on the membership function to aggregated aerosol particles is required for practical use of the method like as an in-situ measurement of diesel soots.

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Errors in concentration measurement of aerosol particles in duct are caused by an anisokinetic sampling. Though these errors have been mainly evaluated with mass median diameter D_p50, they may be estimated by considering size distribution of particles in duct. Assuming the flow without interaction between particles, our equation on D_p50 and several other equations were applied to the case with size distribution of particles. Values of a coefficient As in our equation were determined from 0.1 to 1 in the results. Davies and Belvaev eauations with size distribution described the experimental data better than those with D_p50.

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A self-organization of the stripe-structure and motion of particulate clouds of Pb aerosols in a laser beam was observed by an abrupt increase of the irradiation intensity of laser. The dissipative structure of the particulate cloud of aerosols should be considered from a viewpoint of the coherent space-time structure of disperse system.

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