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Laser Diffraction

From Malvern Instruments, Inc.

The technique of laser diffraction relies on the fact that particles passing through a laser beam scatter light at an angle that is inversely proportional to their size (small particles scatter light at high angles whereas large particles scatter light at low angles). It is therefore possible to calculate particle size distributions if the intensity of light scattered from a sample are measured as a function of angle. This angular information needs to be compared with a scattering model (Mie theory) in order to calculate the size distribution. The technique has a very large dynamic range, from 3.5mm to below 100nm, as defined by the range of angles over which the scattering pattern is collected and the instruments optical configuration.
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