Transform that scattering data into a particle size distribution.Measure scattered light angle and intensity.The basic workflow of a laser diffraction particle size analysis breaks down into two parts: Our LA-960 Laser Diffraction Particle Size Analyzer uses the Mie scattering solution by default and allow the user to input custom refractive index values The use of a refractive index and the Mie scattering theory directly affects accuracy in this size range. The scattered light is at relatively low intensity and wide-angle for these smaller particles. This means the measurement will not benefit from the use of a refractive index to accurately interpret refracted light.įor particles smaller than 20 microns refracted light becomes increasingly important to calculate an accurate particle size. Particles larger than this size communicate useful size information through diffraction and not refraction. The "certain size" is determined as a multiple of the wavelength of light used for the measurement and is typically approximated at 20 microns. The scattered light is at a relatively high intensity and low angle for these larger particles. Diffracted and refracted light is useful for this purpose absorbed and reflected light works against this purpose and must be taken into account during measurement and size calculation.įor particles larger than a certain size the vast majority of light is scattered by diffraction. We can obtain information about the size of a particle using the angle and intensity of scattered light. Refraction occurs as light changes angle traveling throught the particle. Diffraction is also known as "edge diffraction" as that is where it occurs.
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