【作者】 严博；

【导师】 刘缠牢；

【作者基本信息】 西安工业大学 ， 光学工程， 2012， 硕士

【摘要】 微粒粒径是材料学科中一项重要的参数指标,其直观的反应了工业产品的质量。因此,对微粒粒度进行分析是优化产品质量的一个有效的、可靠的途径。目前有很多粒度测量方法,其中激光散射法以其具有测量范围宽、适用材料广泛、精度高等优点得到广泛应用。激光粒度仪目前提高探测精度和范围的方法主要通过扩大光电探测器面积实现的。利用小面积新型探测器作为光靶器件,提高测量精度、范围成为优化激光粒度测量方案的目标。针对这种情况,本文提出了基于图像传感器的激光粒度测量优化方案,并完成了相关理论推导、仿真模拟、程序设计、电路设计和实验验证工作。首先,介绍颗粒粒度分布的概念,研究基于光散射理论的激光粒度测试系统工作原理。通过分析单个颗粒和颗粒群的米氏散射光强分布,结合粒度测量系统工作原理建立微粒的光散射数学模型,并使用Matlab进行仿真模拟。其次,通过分析图像传感器的特性入手,结合激光粒度测试系统对光电探测器的要求,讨论当使用图像传感器作为光靶器件时对测试系统的影响,提出基于图像传感器的激光粒度测试系统优化方案。对激光粒度测试系统中光学系统中主要器件参数进行讨论,研究当使用图像传感器作为光靶器件时对光学系统的影响。使用C#语言编写激光粒度测试系统辅助设计软件,并完成调试。第三,优化激光粒度控制系统。根据以嵌入式控制系统为核心,以PC机为操作平台的设计方案,完成芯片选型、硬件电路设计、PCB板绘制。完成基于嵌入式操作系统AvrX的下位机软件设计,并在Visual Studio 2005开发平台下使用C#设计编写上位机控制软件。最后,本文完成了米氏散射模型仿真结果的分析,通过对激光粒度仪控制系统硬件电路、下位机软件和上位机软件的调试验证,完成了对粒度测试时测量过程的控制。本课题提出的粒度测量方案实现了图像传感器在激光粒度测试中的应用,为进一步研究基于图像传感器的粒度测试技术提供了参考。设计的控制系统实现了激光粒度仪的计算机控制技术,提高了仪器的自动化程度。为下一步仪器的智能化、网络化和小型化打下基础。更多还原

【Abstract】 The particle size is an important parameter index in materials science, which response to the quality of industrial products intuitively. Therefore, the particle size analysis is an effective and reliable way to optimize products quality. There are a lot of particle size measurement methods, in which laser light scattering method are proverbially used for it’s advantages as far-ranging measurement, widely materials application, high precision and so on. The way to improve detection accuracy and scope of laser particle size analyzer is expand the area of the photodetector. Use small area of new detector device as light target to improve measurement accuracy and the scope is the goal to optimize the laser particle size measurement program.In this situation, this article proposed the image sensor-based laser particle size optimize program, and completed the related theoretical analysis, simulation, program design, circuit design and experiment validation.First of all, introduce the concept of particle size distribution, study the working principle of laser particle measure system that based on light scattering theory. Establish the mathematical model of light scattering through the analysis of single particle and particles distribution of Mie scattering light intensity distribution combined with the particle size measurement system theory, and using Matlab to make simulation.Secondly, by analyzing the characteristics of the image sensor, combined with the requirement that laser particle test system remand photoelectric detectors, discuss the effect to the test system when use image sensor as light target. Proposed optimize program of laser particle size test system that based on image sensor. Discuss the main device parameters in the optical system of the laser particle test system, study of the influence to the optical system when using the image sensor device as a light target. Using C# language compile the aided design software of laser particle test system, and complete debugging.Thirdly, optimize the laser particle size control system. According to the requirements of design which core is embedded system and operating platform is PC. complete the chip selection, hardware circuit design, PCB board drawing. Completed software design based on embedded operating system AvrX and writed PC control software using C# in Visual Studio 2005 development platform.Finally, this paper completes the analysis of Mie scattering model simulation results. Accomplish the control of the test process in the particle size measurement through debug and verify the hardware circuit, the computer software, the PC software of laser particle analyzer control system.The particle size measurement project this topic proposed achieved image sensor used in laser particle size test, and provided a reference for further study of particle test techniques that based on image sensor. The control system designs achieve a computer-controlled technique of laser particle size analyzer, improve the automation of instrument. Lay the foundation for the intelligent, networklization and miniaturization of instruments.更多还原