INCIDENCE (static light scattering) in the static light scattering particle size analysis method, when the particle size large light wavelength, g of Fraunhofer diffraction measurement before the forward scattered light intensity distribution of the small angle region to determine the particle size. When the particle size is similar to the wavelength of light, use a meter to correct the contact angle scattering theory plant sales and use 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 original contact angle measurement method was first proposed based on Fraunhofer diffraction theory of laser particle, the principle is measured by a laser particle will appear Fraunhofer diffraction, diffraction of particles of different size distributions produced with angle different, diffraction by the diffraction energy distribution and the response of the particles after the laser can be calculated based on 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. Electric ultrasonic particle size analysis point ultrasound analysis is the latest in particle size analysis method, the particle size measurement range is 5 ?? m ~ 100 ?? m. It analyzes the principle of the contact angle is more complex retail, simply put, when the sound waves within the sample conductive contact angle, the instrument can analyze the sound wave attenuation over a wide frequency range of ultrasonic attenuation spectra obtained by measuring sound waves can calculate book attenuation values ??and granularity. Analysis required density of the particles and the liquid, the viscosity of the liquid, the mass fraction of the particles and other parameters of the emulsion or colloid particles in a flexible, but also the thermal expansion parameters of particles (including the particle size, ξ electric potential, etc.), no dilution, Avoid the laser particle size analysis method can not analyze the dispersion of high concentration of defect size and high precision, a wider range of particle size analysis. The contact angle where the good | Gaozhou contact angle | ShengDing instruments 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!