![]() Irregularly-shaped particles induce broad size distributions because both width and length are considered as individual particles. Key manufacturers engaged in the Laser Diffraction and Dynamic Light Scattering Particle Size Analyzers industry include Malvern Panalytical, OTSUKA Electronics. Therefore, particle shape can not be identified. Laser diffraction assumes that all signals originate from particles that are ideally spherical. The recirculation system of the equipment ensures the total homogenization of the sample. Laser diffraction analysis, also known as laser diffraction spectroscopy, is a technology that utilizes diffraction patterns of a laser beam passed through any object ranging from nanometers to millimeters in size 1 to quickly measure geometrical dimensions of a particle. Wet samples like emulsions are suspended in a liquid, and powders are analyzed in an air stream. Laser diffraction is suitable for wet and dry samples. It is a valuable analysis parameter for research and product development purposes in multiple industries. Particle size is an important characteristic of powders and particulate materials. Large particles scatter light at a high intensity, while small particles do so at a low intensity. Particle size also affects scattering intensity. Large particles scatter light at small angles, and a decrease in particle size increases the scattering angle logarithmically. Laser diffraction equipment detects the intensity distributions of laser light scatters from multiple particles simultaneously.įraunhofer diffraction theory states that the intensity of light scattering is directly proportional to particle size. Light propagates from the edges of particles as spherical wavefronts, and interactions between the light and the particles lead to the diffraction phenomenon. The diffraction phenomenon occurs when monochromatic, coherent, and polarized light hits an object. ![]() A mathematical model based on the Fraunhofer and Mie theories is applied to determine the particle size distribution. Laser diffraction measures the scattering intensity of light from particles in a suspension as a function of scattering angle, light wavelength, and light polarization. Laser diffraction is based on the indirect calculation of particle sizes from the diffraction patterns of particles. The intensity of light scattered by a particle is directly proportional to the. angle is a direct function of particle size. Laser diffraction analysis is based on the Fraunhofer diffraction theory. Laser diffraction has a wide dynamic range, as it can detect particles from 0.02 µm to 2 mm. When compared to dynamic light scattering (DLS), Particle motion is less important since scattered intensity vs. During the analysis, a laser beam is passed through a sample in liquid suspension or dry powder dispersion form. Laser diffraction (LD), also known as static laser light scattering (SLS) is one of the most popular ways to analyze particle size distribution. Particle size distribution analysis with laser diffraction ![]()
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