When a decision is to be made about acquiring a new instrument for particle sizing, basically two options are available: a goniometer based or an enclosed light scattering instrument. It is therefore interesting to compare the strengths and weaknesses of the two technological solutions in order to select the instrument best suited for the task. In both cases, Dynamic Light Scattering (DLS), is the fundamental technology used by the two instruments. In modern instruments, both technological approaches should be equipped with a digital correlator capable of transforming photon counts into the correlation function which is the basis for all calculations leading to size data. In addition, the correlator should provide a wide range of time delays and offer a reasonably high number of delay channels to provide the required resolution.
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