Study light scattering method light scattering method (light scattering) is divided into two kinds of static and dynamic and static light scattering (ie, the time-averaged scattering) measurement of scattered light distribution space, dynamic light scattering study law in the scattered light at a fixed spatial location The variation of intensity with time. Mature light scattering theory mainly Fraunhofer (Fraunhofer) diffraction theory, Fresnel (Fresnel) diffraction theory, m (Mie) and Rayleigh scattering theory (Royleigh) scattering theory. Laser particle size analysis is the most major nanomaterials system size analysis methods. When a bundle of laser irradiation wavelength λ in a certain small particle size spherical particles of high temperature and contact angle, diffraction and scattering two phenomena will occur, when the particle size is usually greater than 10λ, mainly to the phenomenon of diffraction; diffraction phenomenon when Master; the contact angle is less than the factory when the particle size 10λ, places scattering based. General contact angle, sample analysis laser diffraction particle size analyzer only at 5 ?? m or more accurately; and dynamic light scattering particle size analyzer in the nanometer particle size 5 ?? m or less, submicron particles accurate sample analysis. In addition, the theoretical model of laser particle size analysis is based on the particle shape for the autumn, on monodisperse condition, but actually measured particles were more irregular shape and polydispersity. Therefore, the particle shape, particle size distribution characteristics on the final result of the larger particle size analysis, and the more irregular particle shape, particle size distribution is wide, the greater the results of error analysis. INCIDENCE (static light scattering) in the static light scattering particle size analysis method, when the particle size large contact angle of the wavelength of light, g before use Fraunhofer diffraction measurement to the small angle region of scattered light intensity to determine the particle size distribution. When the particle size is similar to the wavelength of light, use Mie theory is corrected using spectroscopy. Laser particle size analysis based on both theoretical principles have been applied in actual production. Fresnel diffraction theory as the guiding principle to achieve particle size measurement is in the near field (relative to the Fraunhofer diffraction) of the diffracted light detection parameters and calculate the particle size distribution, the method has the theoretical feasibility for laser particle size analyzer to achieve miniaturization is a good solution. Mature laser diffraction particle size analysis is based on Fraunhofer diffraction theory developed. 1976, first proposed measurement method based on laser particle Fraunhofer diffraction theory, the principle is measured by a laser particle will appear Fraunhofer diffraction, diffraction of different size particles produced with the distribution of angles and different, diffracted by the diffraction energy distribution and the response of the particles after the laser can be calculated according to the particle size distribution of the particles of the sample. Subsequently, a number of countries have developed based on this principle of laser particle size analyzer. According to Fraunhofer diffraction theory designed laser particle size analyzer measurement range of 3 ~ 1000? M. High temperature contact angle _ _ ShengDing contact angle instrument provided by the Dongguan Sheng Ding Precision Instrument Company. Dongguan Sheng 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 improving innovative ideas will lead ShengDing instrument and you hand into the brilliant, for a better future!