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Powder industry is a people live, work-related businesses, the human in powder production and processing has a very long period of historical time, people in life are also inseparable from the fruit powder technology and convenience [8 ]. Powder word first appeared in the 20th century, in the early 1950s, and for the application of powder began in the Stone Age, the ancient cavemen have Beijing Zhoukoudian decorative use of hematite stone beads, as time goes by, people raw clay in pottery quartz powder is added to improve the performance of heat-resistant CML pottery, Yangshao period, people with hematite, manganese and other black pigment powder for making pottery, Ming Sung book \Kai, \With the continuous development of powder technology, people Powders deepening measurements on powder particles, characterization become a research focus, while the powder particles mainly for the measurement of particle size on the specific surface area, particle surface morphology and the true density of the powder. The powder industry, the true density is one of the basic properties of various powders, have different powders having different densities, the density of the powder size and molecular structure are closely related, affects the density of the surface properties. In industrial production, but also by measuring the true density of the product do its purity analysis. True density of the main attributes is mineral, it is not only one of the identifying characteristics of important minerals, or quantitative structure determines the crystal structure and crystal defects in the number of the important criterion of the degree of crystallization, not only that, the performance of the material with micro-macro characteristics of the particles are closely related, so the true density of this indicator is widely used in materials science and other related fields of science. With the powder industry, from the beginning can barely produce particle size between 0.1-10μm fine powder, to be able to easily produce a particle size of 0.001-0.1μm between nanoscale powder materials, thanks powder technology in constant development, progress, followed by how the powder for efficient detection and characterization become an increasingly important research topic, the measurement of the powder particles, powder characterization is body production process control means and methods of traditional means of detection accuracy is low, not high degree of automation, information processing speed is low, the test results can not be timely and effective feedback delay cause the control to adjust the production process and other shortcomings, to a certain extent limit the powder industry to a higher precision and advanced development [8]. Along with e-science, the rapid development of computer technology, measurement and control instrumentation automation is becoming more intelligent, will make the development of all walks of life to break through the bottleneck. True density test based on traditional methods of some shortcomings, in order to meet the modern powder powder industry for measuring and characterization of real efficiency needs, this use of electronic science and technology, computer technology, combined with the sensor principle, automatic control theory, C8051F020 MCU As microprocessor, microcontroller-based control system proposed automatic true density tester design, in order to achieve a fully automated rapid test, analyze the true density of solid material, the test results than the traditional method pycnometer better repeatability, accuracy, and more high.
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