A particle size measurement method based on micro-vision technology to improve the measuring precision is proposed in this paper. Firstly, the center point of the shape is determined by a single regular geometric boundary, and a corresponding spatial coordinate system is established. Secondly, by establishing a geometric shape size calibration model, the pixel size of basic parameters such as length, width, and cross-sectional area of the geometric shape is determined. Then, using autonomous motion calibration method, the pixel equivalent at the current image magnification is calibrated to reflect the correspondence between the pixel size of the image and the actual size, thereby expressing the actual size of the geometric shape. Finally, principal component analysis was used to compare, classify, and statistically analyze the measured geometric dimensions, eliminate duplicate values, reduce misidentification rates, and achieve accurate determination of geometric dimensions. In order to verify the validity of the method, repeat 5 times to measure the particle size of 100 nm, the experimental results show that the mean value ± standard deviation is consistent with the theoretical value. Therefore, this method reveals the possibility of high-precision measurement of particle size through computer micro-vision, and makes it be a much better option to be employed for further micro-nano structures analysis applications.
In modern manufacturing, the in-process measurement of complex surface of cylindrical gear is critical and challenging, and is directly associated with subsequent assembly and terminal gear quality. 3D geometric measurements of gear are ones of the crucial fundamental quantities to ensure their conformity to design specifications serving a range of industries, from shipping, automotive and aerospace industries to house applications. In this paper, an automated sampling path planning model is designed in order to obtain a loss cost sampling path by consider of the complex surface of cylinder gear. The high-precision full information model of tooth flank is also being established, which depends on the measurement procedure and the measurement uncertainty. A series of experiment on several typical cylindrical gears were carried out to demonstrate this automated path planning technique and the final geometric measurement accuracy. On the other hand, an commercial 3D geometric measuring system was also introduced, which has two degrees of laser scanner. Those scanning paths generation have been proven to be amenable for practical purposes through many tests so that it might be applicable to achieve 3D geometric measurements of large gear.
In modern intelligent living, Carbon dots exhibit the great potential by virtue of their unique structure and attractive optical performance serving a range of monitoring and management, from biochemical analysis, biological imaging and environmental monitoring. In this paper, a sub-micro line spacing standard shape was designed based on phosphorescence carbon dots. This spacing standard not only has an unequally spacing line widths, but also shows that the particle size distribution of Carbon dots range from 1.0nm to 10nm. On the other hand, in order to exhibit the potential of our designed shape, a series of experiments were preformed to demonstrate the relationship between fluorescence intensity and special effects. Those results have been proven to be amenable for practical purposes through many tests so that it might be applicable to achieve lighting illumination in different scenes.
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