基于数字粒子图像测速的水雾粒径测量算法及实验

针对利用传统数字粒子图像测速（DPIV）法测量水雾粒径时粒子影像拉长对测试结果的影响,提出了基于DPIV建立的改进图像法（IIM）。设计了水雾粒径测量试验系统,对细水雾进行实时测试,并对比了采用本文算法与直接等效法测试水雾粒径子半径的差异。结果表明：采用本文的IIM得到的测试结果更为准确。通过最小二乘法对粒径分布进行拟合,发现对数正态分布函数和威布尔函数都可以较好地描述粒径分布。     

Defect-induced failure of optical coating filters

Optical filters composed of Ag, Al₂O₃, and ZnSe films were prepared on BK7 substrates by evaporation. By employing spectrophotometer, microscope, scanning electron microscope (SEM), and energy dispersive spectrum (EDS) analysis, the moisture-dependent stability of the samples was tested. The experimental results revealed that filter failure often occurs initially at defect sites. Small sputtering particles and pinhole are found to be two types of defects that induced the optical coating filter failure. The mechanisms of the defect-induced failure of the filters also are discussed in the article.     

一种改进的基于小波变换的图像边缘提取算法

在对现有的基于小波变换的图像边缘提取方法进行简要分析的基础上,提出了图像边缘提取改进算法.该算法主要是对边缘点的判断准则进行了改进,通过将任一点的梯度方向与水平、垂直、45°、135°方向进行比较,将这4个方向中与该点梯度方向最接近的一个方向重新赋给该点的梯度方向,并检验二进小波变换的模在该点是否为新的梯度方向上的局部极大值,若是,该点就是边缘点,否则不是.最后通过模拟实验给出了该方法的实验结果,实验结果有力地证明了该方法的有效性.     

基于单电流传输器双二阶滤波器的研究

提出一种采用电流传输器 CC -结构的电压模式双二阶滤波器 ,其功能经双输入 ,单输出可在输出端得到高通、带通两种二阶滤波功能 ,具有一定的应用价值 .     

psBCK-代数的Boolean滤子与psMV-滤子

在psBCK-代数中引入Boolean滤子和psMV-滤子的概念,研究了这2种滤子的性质及其相互关系．同时,借助psMV-滤子概念,给出psBCK-代数成为psMV-代数的若干充要条件．     

多环芳烃的滤纸基质室温磷光法研究

本文以芘为模型化合物,对滤纸基质室温磷光法的重原子进行选择, 并研究了影响磷光强度的因素. 在通氮气情况下,以十二烷基硫酸铊为重原子, 测定了芘、芴、萘三种多环芳烃的室温磷光.实验结果表 明: 芘、萘、芴的最低检测限分别为 1. 5ng、3. 0ng 和 3. 0ng, 相关系数均大于 0. 995, 相对标准偏差均小于 5%.     

Fuzzy Ordered Filters in Negatively Partially Ordered Semigroups

本文将引入负偏序半群的Ｆｕｚｚｙ序滤子的概念，并研究Ｆｕｚｚｙ序滤子成为序滤子的充要条件及Ｆｕｚｚｙ序滤子的结构性质     

线性相关计算法形成数字剪切散斑相关条纹图

本文提出了用线性相关计算法形成数字剪切散斑干涉条纹的新方法,从理论分析和实验研究均证明,用该方法所获得的数字剪切散斑相关条纹图在图象监视器上易于观看,条纹图象光强无直流分量影响且可见度较减模式要高,该新方法的采用为今后的条纹图象分析奠定了基础。     

A New Imaging Method with a Spatial Filter for Incoherent Stream

A new imaging method using an incoherent-type pupil filter: SFINCS (Spatial Filter for INCoherent Stream) is presented. The new filter divides the imaging beam into several incoherent beams at the pupil plane thereby enlarging the depth-of-focus (DOF). The capabilities of SFINCS are studied by simulations and several ways to realize the method are also discussed. The experimental results show that SFINCS has excellent DOF expanding capabilities for a point-image such as a hole pattern in VLSI lithography, and that 1.7 μm DOF is obtained with a 0.30 μm hole pattern by an i-line projection lens with 0.57 NA (numerical aperture).Presented at the International Commission for Optics Topical Meeting, Kyoto, 1994.     

Estimation of systems with statistically-constrained inputs

This paper discusses the estimation of a class of discrete-time linear stochastic systems with statistically-constrained unknown inputs (UI), which can represent an arbitrary combination of a class of un-modeled dynamics, random UI with unknown covariance matrix and deterministic UI. In filter design, an upper bound filter is explored to compute, recursively and adaptively, the upper bounds of covariance matrices of the state prediction error, innovation and state estimate error. Furthermore, the minimum upper bound filter (MUBF) is obtained via online scalar parameter convex optimization in pursuit of the minimum upper bounds. Two examples, a system with multiple piecewise UIs and a continuous stirred tank reactor (CSTR), are used to illustrate the proposed MUBF scheme and verify its performance.