Single particle optical sizers

PSS Accusizer 780/SPOS Single particle optical sizer consists of a patented autodilution stage, single particle optical sensor, pulse height analyzer/counter (PHA), systems computer/processor and software control. The autodiluter performs a continuous dilution of the concentrated sample... 

For the micron size range an optical on-line particle sizer was used, working on the principle of white light scattering on single particles. This instrument provided number concentration and size distribution measurements in the range 0.3-30 pm, with a maximum of allowed particle number concentration of 10 particles/cm. ... 

Fig. 7 Differential Count Distribution of four silica gel samples (Optical Single Particle Sizer)...

Unlike other particle sizers, the microscope gives the operator a clear visual outline of each individual particle being measured. In addition, the material may be presented in its normal form, dry or in a liquid medium. Particles that are aggregated can be identified and will not be measured as a single entity. Problems associated with microscopic sizing lie not only in the tedious nature of the technique but also in the slide sample preparation, optical resolution, and operator bias. 

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