White Paper: Inside the Laser Diffraction Technique
Laser diffraction is a common and reliable method for measuring particle size. This white paper explains how laser light is diffracted by particles, how samples are measured, and how the resulting data are used to determine particle size distributions, highlighting why laser diffraction is widely used for particle size analysis in routine applications.
Laser diffraction is one of the most widely used techniques for particle size analysis due to its speed, robustness, and broad measurement range. This white paper provides a comprehensive overview of the laser diffraction technique, explaining the fundamental physical principles of light diffraction and their application to particle sizing. It describes how diffraction patterns generated by particles of different sizes are detected and how the resulting angular scattering data are recorded and processed. The paper further outlines how raw intensity data are analyzed using established theoretical models, such as the Fraunhofer approximation and Mie theory, to derive particle size distributions. Key result parameters, including volume-based distributions and characteristic values such as D10, D50, and D90, are discussed in accordance with ISO standards for particle size representation. Overall, this white paper demonstrates that laser diffraction is a reliable and efficient method for particle size determination in research, development, and quality control applications.
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