Laser diffraction mathod is a process of sample analysis in metal extracting metallurgy from ore. In this process while doing lase analysis finer particles inducing more scatter than coarse. Why?
I don't what kind of particles you are studying (polymers - powder etc...). Anyway, Laser diffraction can be used to probe particles size ranging from hundreds of nanometer to several millimiters. In fact, the smaller the particle, the larger is the angle of the scattered beam. Consequently, a measure of the angle-dependent intensity of the scattered beam is used to determine the particle's size according to Fraunhofer or Mie's models.
I don't know what kind of particles you are studying (polymers - powder etc...). Anyway, Laser diffraction can be used to probe particles size ranging from hundreds of nanometers to several millimiters. In fact, the smaller the particle, the larger is the angle of the scattered beam. Consequently, a measure of the angle-dependent intensity of the scattered beam is used to determine the particle's size according to Fraunhofer or Mie's models
We need more information to be sure of your issue. A single small particle will scatter less light than a single coarse particle. However, if you are talking about similar mass concentrations, a milligram of 1 micrometer diameter particles of a given material will have one thousand times as many particles as a milligram of 10 micrometer diameter particles. Mie theory gives a more sophisticated view of scattering as a function of size and refractive index and angle -- see https://en.wikipedia.org/wiki/Mie_scattering -- but first you need to decide whether you want an answer for equal mass concentration or equal numbers of partcles.
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