Appropriate considerations must be made to properly account for irregular particle shape.Īccording to ISO 13320, measuring instruments for laser diffraction can be operated with either Fourier optics or reverse Fourier optics. An irregular particle shape leads to broader size distributions, since both the width and the length of the particles contribute to the overall scattering signal and are included in the result. Therefore, laser diffraction is a so-called ensemble measurement method.ĭuring evaluation, all signals are treated as if they were generated by ideal spherical particles. This is therefore an indirect measurement method since the size is not measured directly on the particle but is calculated via a secondary property (diffraction pattern).įurthermore, the recorded pattern is generated by particles of different sizes at the same time, so it is a superposition of the scattered light of many particles of different sizes. When evaluating the signal, it must be taken into account that a particle size does not correspond to a specific angle, but that each particle scatters light in all directions at different intensities. The evaluation of this signal is based on the principle that large particles preferentially scatter light at small angles whereas small particles have their scattered light maximum at large angles. See the Optics Calculators by iCalculator™ below.In laser diffraction analysis, the scattered or diffracted light is recorded over the widest possible range of angles by means of a special laser and detector arrangement. Check your calculations for Optics questions with our excellent Optics calculators which contain full equations and calculations clearly displayed line by line.Test and improve your knowledge of Interference and Diffraction of Light with example questins and answers Optics Practice Questions: Interference and Diffraction of Light. Read the Interference and Diffraction of Light physics tutorial and build your physics knowledge of Optics
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