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 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 the particle measurement method based on laser Fraunhofer diffraction theory, the principle is measured by a laser particle will appear Fraunhofer diffraction, diffraction different size distribution of particles produced with different angles, 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. Platinum plate method: When the sensing immersed in the liquid under test, the platinum plate around the corner would be the role of the surface tension of the water droplet contact angle of repair, the surface tension of the liquid will try to pull down the platinum plate. When the liquid surface tension force and other related counterbalance equilibrium angle of water droplets, sensing platinum plate will stop inside the liquid immersion. At this time, the instrument will measure the balance sensor immersion depth, and converts it to the surface tension of the liquid. Platinum loop method: As is widely used du Nouy Tensiometer, this method is also known du Nouy method, and consequent easy operation is widely used. Platinum Tour de France said the law is the result of this test section between the liquid sample obtained will form a ring. JK99 Series Automatic tension meter for measuring regular table / interfacial tension, because its simple (one-button automatic), high speed (3 seconds), good repeatability and high measurement accuracy, is currently the most widely used tension meter. The disadvantage is that not measure ultra-low interfacial tension (such as oil and crude oil interfacial tension between the drive should be 10-5mN / m, can not be measured with a series JK99). JK99 Series Automatic tension meter imported sensors, although costs than domestic water droplets are much higher torsion wire angle sensor manufacturers, but to ensure that the measurement accuracy. While using a dual temperature control technology, built-in electric heating or external temperature bath temperature control options. JK99B type must be connected to a computer to use, JK99C type as one of the dual-use machine drops angle tension test, built-in LCD digital display and a small printer that can single stand-alone operation, but also can be connected to a computer to control the dynamic changes observed tension curve. Other parameters such as exactly the same two models of precision. Angular contact angle of water droplets maintenance | ShengDing (certified) | Meizhou droplets angle provided by the Dongguan Sheng Ding Precision Instrument Company. Dongguan Sheng Ding Precision Instrument Co., Ltd. (www.dgshengding.com) is Dongguan, Guangdong, dedicated instrumentation leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Sheng Ding instrument in leadership with the staff warmly welcome all inquiries negotiations to create ShengDing instrument a better future.