Laser particle size analyzer
The so-called laser particle size analyzer refers to an instrument that analyzes the size of particles through the diffraction of particles or the spatial distribution (scattering spectrum) of scattered light. According to the stability of the energy spectrum, it is divided into static light scattering particle size analyzer and dynamic light scattering laser particle size analyzer
Static light scattering laser particle size analyzer
The energy spectrum is a stable spatial distribution. It is mainly suitable for the testing of micron-sized particles, and the lower limit of measurement can be extended to tens of nanometers after improvement.
Laser particle size analyzer based on dynamic light scattering principle
According to the speed of Brownian motion of the particles, the size of the nanoparticles is analyzed by detecting the dynamic light scattering signal of one or two scattering angles, and the energy spectrum changes at high speed with time. The particle size analyzer based on the principle of dynamic light scattering is only suitable for the testing of nano-sized particles.
Translucent sedimentation analyzer is not a laser particle size analyzer
Generally speaking, the laser particle size analyzer refers to the particle size analyzer of the principle of diffraction and scattering, and the light transmission sedimentation analyzer, which is based on the Stokes sedimentation law rather than the laser diffraction / scattering principle, so this type of instrument cannot be called a laser particle size analyzer .
How to obtain the scattered light energy spectrum distribution of particles by laser particle size analyzer
Laser particle size analyzer is a special instrument that uses the principle of scattering to determine the particle size distribution of particle groups by detecting the scattering spectrum of particles. The schematic diagram of the basic optical path for obtaining the particle scattering spectrum is shown in Figure 1. The laser light emitted by the laser is filtered and expanded to the sample window through the Fourier lens. When there is no particle in the sample window, the laser will converge on the center of the probe. The scattered light is detected by the probe and converted into an electrical signal, and the computer calculates the particle distribution based on the scattered signal. The calculation result is displayed on the liquid crystal display or printed out by the micro printer. The probe is generally a semi-circular photodetector array (see Figure 2), each ring is an independent detection unit, representing a specific spatial frequency interval, from which the detector can obtain the scattering spectrum of the measured particle group, According to the scattering spectrum, the particle size distribution of the particle group can be analyzed.
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