Pegasor Oy (Ltd)

Background - Particle size is not well defined

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Courtesy of Pegasor Oy (Ltd)

Background - Particle size is not well defined

Fine and nanoparticles can be defined in many ways. Especially when defining the particle size and concentration. Particle size can be measured either off-line or on-line. Off line techniques typically give out particle filter mass concentration. Off-line techniques are seldom used to define particle size. When this is done, electron microscopy is typically used to measure particle geometric size. When measuring particle concentration with off-line techniques, several artefacts enter into play. When particles, especially from engine exhaust are collected on a filter, the filter media itself reacts with the exhaust gas particle thus having an effect on the final result.

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