Material particle size analysis method to have a lot of water droplets corner, has developed and produced more than 200 kinds of works based on various analytical measurement device, and there are always new particle size measurement methods and instruments developed. Although a variety of methods of particle size analysis, basically can be summarized as the following method. The traditional methods of measuring particle sieving, microscopy, sedimentation, electric induction method, a method developed in recent years with a laser diffraction method, laser light scattering, photon correlation spectroscopy, electron microscopy image analysis method, based on the particle-step Brownian motion of the particle size and mass measurement method. Wherein the laser scattering method and photon correlation spectroscopy method because of high speed, wide measurement range, the data is reliable, reproducible, high degree of automation, ease of on-line measurement, etc. are widely used. (Particle size analysis. Principle sedimentation sedimentation (sedimentation size analysis) is based on the particles in the suspension system, the particles themselves neutral (or suffered centrifugal force), suffered buoyancy and viscous resistance of the three equilibrium angle of water droplets, and the viscous obey the Stokes force measuring principle to implement, in which case the particles in the suspension system at a constant speed subsidence, and the sedimentation rate is proportional to the square of the particle size. It is worth noting that the water droplet angle where cheap, only to satisfy the following conditions Determination of particle size using the sedimentation method; particles want to be close to the spherical shape, and the liquid is completely wet; settling velocity of the particles in the suspension system is slow and constant, but a very short time to achieve the desired constant velocity; the particles in the suspension system Brownian motion does not interfere with its settling velocity; interplay between particles does not affect the determination of particle size of the settlement process of sedimentation into gravity settling into gravity sedimentation and centrifugation two sedimentation, gravity sedimentation method is suitable particle size 2 ~ 100 ?? m particles, and centrifugal sedimentation method is suitable for particle size 10 ?? m ~ 20 ?? m particles due to centrifugal particle analyzer using Stokes principle, it is an analysis of the resulting etc. efficiency particle size, particle size distribution for the equivalent weight average particle size distribution of the autumn general speed centrifugal sedimentation material suitable for Nali size analysis method is now more accepted extinction sedimentation method, due to the different particle settling velocity of the particles in the suspension system Different original droplets angle, the same depth of particle settling time is different, and therefore, the density at different depths in the suspension will exhibit different variations, according to the measuring beam through an optical density of the suspension system can calculate the particle size distribution. Its The advantage is the advantage of measuring the mass distribution is a measure of the mass distribution, strong representative test results contrast with the instrument is good, the price is cheaper drawback is for testing small particles slow speed, poor reproducibility;.. for non-spherical particles in a large error not suitable for mixed materials, the dynamic range is narrower than the laser diffraction angle of water droplets where the good |. droplets corner |. ShengDing instruments provided by the Dongguan Sheng Ding Sheng Precision Instrument Co., Ltd., Dongguan City, Ding Precision Instrument Co., Ltd. (www.dgshengding. com) strong, credible, in Dongguan, Guangdong specialized instrumentation industry has accumulated a large number of loyal customers. The company better work attitude and constantly improve the innovative ideas will lead ShengDing instrument and you hand into the brilliant, better Future!