激光数字光学平面玻璃表面检测系统技术研究

干涉波面数字化和测量分析处理方法是激光数字平面检测系统中的核心技术,只有掌握了此核心技术的关键内容,才能够真正实现对光学平面的快速高精度检测。对光学干涉波面的拟合函数系的选择、拟合算法、系统像差以及被测表面平面误差类型进行了理论分析和算法优化,并进行了实验测试,完成了系统的构建。发现了Zernike多项式阶选择法则,提出被测光学表面误差类型的判别标准以及一种全新的在“Zernike像差空间”确定激光数字光学平面检测系统精度的理论和方法,为实现检测自动化奠定了理论基础。     

Infrared particle detection for battery electrode foils

Failures of electrochemical cells caused by internal shorts still are an important issue to be faced by the cell manufacturers and their customers. A major cause for internal shorts are contaminated electrode foils. These contaminations have to be detected securely via a non-destructive inspection technique integrated into the electrode manufacturing process. While optical detection already is state of the art, infrared detection of particles finds a new field of application in the battery electrode manufacturing process. This work presents two approaches focusing on electrode inspection by electromagnetic radiation (visible and infrared). Copper foils with a carbon based coating were intentionally contaminated by slivers of aluminum and copper as well as by abraded coating particles. Optical excitation by a flash and a luminescent lamp was applied at different angles in order to detect the reflected visible radiation. A laser impulse was used to heat up the specimen for infrared inspection. Both approaches resulted in setups providing a high contrast between contaminations and the coated electrode foil. It is shown that infrared detection offers a higher security thanks to its reliance on absorbance and emissivity instead of reflectivity as it is used for optical detection. Infrared Detection offers a potential since it is hardly influenced by the particle’s shape and orientation and the electrode’s waviness.     

Pickup lens inspection on the 5th order aberration using shearing interference by grating with curve fitting algorithm

An optical system based on shearing interference using diffraction grating was applied, to carry out the aberration inspection process of the pickup lens of a digital versatile disc (DVD) at high speed. An algorithm was devised that processes points allocated on certain lines on a fringe and fits relations between the distance from basis point to the measurement points, and phase data of the fringe at these points to an equation of higher degree as curve fitting. Aberration was numerically estimated as the size of a certain coefficient. Simulation showed that this algorithm could detect all 5th order aberrations independently. An inspection system developed based on this optical system and algorithm detected aberration as accurately as a conventional interferometer that has been used as the standard, attaining an inspection time of 1/10-1/20. In comparison with the spot method, this system has 5th order aberration detecting ability and 1/3 the inspection time.     

Defect enhancement in periodic masks using 1/2-Talbot effect

In this paper, we present a simple system for defect enhancement in periodic masks, enabling in this way their rapid localization. The system uses the fact that periodic structures under coherent illumination generate replicas of itself displaced half period at certain distances (1/2-Talbot’s length). Projecting back this displaced self-image onto the mask creates a suppression of the periodic structure. If the mask presents defects, the cancellation of the periodic structure allows their detection since the self-imaging phenomenon occurs only for the periodic structure. The technique may be applied to transmission masks like semiconductor wafers, photomasks for integrated circuits or LCD panels.     

基于Hash算法的分布式状态检测技术

为了克服IP数据报独立选择路由带来的，在拥有多个接入点的分布式网络模式下传统的状态检测技术无法进行有效的安全检测的缺陷，提出了一种应用于网络层的分布式Hash算法，将源和目的地址相同的IP数据报定向到同一个接入点上进行处理，使得在该点上可以完整地重组会话，从而实现分布式状态检测．为增加该算法的鲁棒性，进一步提出了一种应用于传输层的、具有回迁策略的负载平衡算法，选择任务最少的邻居节点协同处理本地过多的负载，转为轻载状态后迁回迁移出去的任务．仿真实验证明该算法具有较好的可行性、稳定性．     

某住宅楼质量问题鉴定与加固

对某小区7号住宅楼存在的工程质量问题作全面的检测，分析了混凝土强度低劣的原因，并提出了加固处理措施．     

Asymptotic analysis of stochastic block replacement policies for multicomponent systems in a Markov environment

An asymptotic analysis of stochastic block replacement policies for a multicomponent system with fast Markov switches is provided. It is proved that this system can be approximated by a simpler system with exponential failures and averaged failure rates. The optimality of the long-run cost function is studied, as well.     

记数抽样检查方案设计与分析软件研制

利用VisualC++6.0Windows开发设计了抽样方案分析与设计软件。软件集成多种功能于一窗口,直观性强,操作方便,计算速度快,不仅可对现行抽样方案检索与分析,而且还可对一次、二次、五次和序贯抽样方案进行设计与分析,并作计算机模拟,可供抽样检查和抽样方案设计人员使用。     

一种快速检测圆心的抗噪声亚像素算法

在印刷电路板的自动光学检测中，被检对象的空间对准是一个关键步骤，而传统的图像匹配技术由于其只能在像素级定位，而无法适应印刷电路板精确对准的要求。本文利用圆的几何对称性，提出一种在亚像素精度快速定位圆心的算法。