LED远场光强分布测试平台设计

提出并设计了以LED作为光源进行远场光强测试的平台,包括光路与电路两大部分,详细描述了远场测量的实现方法、光电转换与信号处理过程、电路设计原理.运用MATLAB进行数据处理,拟合出远场光强分布曲线,分析了距离、辐射角度与光源强度的关系.经测试,在远场空间某一定点的光强值只与光源强度相关,在辐射角内可以直接体现光源稳定性.     

基于地球模拟器LED光源反光碗的设计

结合恒星模拟器的需要,使用LED光源,设计特定光强的照明系统。要求达到需要的光强分布。以此模拟色温为7000K的恒星,用于敏感器的标定。本文结合非成像光学理论,设计反光碗,对LED组进行配光整形,合成需要的配光曲线。使用4个LED光源芯片,反光碗口径为600mm。应用lighttools软件,建模仿真,得到仪器的配光曲线,与参考曲线进行对比,误差小于15%。     

基于MSP430的太阳光源跟踪控制系统设计

为了提高太阳能电池板的能量转换效率,提出了一种基于MSP430的太阳光源跟踪控制系统。系统设计原理采用光强比较法,硬件部分设计了光强信号采集电路、以MSP430为核心的主控制器、步进电机驱动电路等;软件部分采用模块化编程,加入数字滤波和控制算法。系统实现了刘信号采集与处理、电机驱动等模块的控制,能够快速准确跟踪太阳光源。运行实验结果表明,系统运行稳定,控制灵活,达到预期的设计目标。     

基于LabVIEW的虚拟实验仪器设计研究

介绍虚拟仪器的基本原理．叙述虚拟仪器开发平台LabVIEW的特点,并提出虚拟实验仪器系统的软件设计方案。以音频信号分析系统设计为例,验证虚拟实验仪器的实用性和优越性。利用麦克风采集被测对象生成的音频信号,再通过计算机的声卡转换为数字信号,最后由自制音频分析虚拟仪器实现音频信号的时域分析、频域分析及数据存储等功能。     

同步辐射装置主信号源的扩展方法研究

主信号源是同步辐射装置的关键组成部分之一,它不仅用于产生同步辐射光源各子系统所需的稳定度极高的参考信号,还用于生成整个装置的控制系统所需的高精度工作时钟。一般使用射频信号源作为主信号源,而商业射频信号源一般只配备单输出通道,远远不能满足同步辐射装置的需要,使用传统功分器对主信号通道进行扩展又存在幅度衰减、精度下降且相位不一致的问题。为解决上述问题,利用射频芯片AD9361,研究了对主信号源的单路输出进行扩展的方法。该方法可根据用户需求完成相应数量的信号通道扩展,设计了AD9361芯片和FPGA主控模块相结合的硬件架构。搭建实验平台,开展了射频信号源在C波段扩展的实验研究,对所提出的扩展方法进行实验验证。实验结果表明,该方法能保证扩展信号的幅度、频率与相位与主信号保持高度一致。     

基于Matlab GUI的太阳辐射定标数据处理平台设计

太阳辐射监测仪(SIM)是某卫星上监测太阳辐射的有效载荷,其地面太阳辐射定标结果是在轨数据处理的重要依据;定标中3台仪器共8个通道产生大量的数据,各通道数据的处理方法不同,为了方便大量数据的快速处理和分析,设计了基于Matlab GUI的数据处理平台,该平台面向矩阵操作,具有强大的图像绘制能力,程序修改简单,实现了多角度跟踪测量数据的快速处理和图像输出,给出了卫星在轨标定曲线及方程,在轨标定结果表明该平台工作可靠,数据处理准确。     

一种高绝缘油静电荷密度测试仪

本文介绍了一种新型的高绝缘油流电荷密度测试仪。首先介绍BSO晶体传感器的原理,结构,然后详细阐述测试仪的结构及消除光源光强漂移引起的测量误差的方法。由于这种测试仪采用光信号,对测试仪器和被测物起到了很好的隔离作用,适用于电力系统及石化系统高绝缘油静电荷量测试。     

锡膏激光扫描三维测量系统光强自适应调节技术

根据锡膏激光扫描三维测量系统在测量PCB电路板时底板和锡膏对激光光强的散射效果不同,设计并研制了一套光强自适应调节光源。该光源以程控电源为基础,分析光条中心提取效果与激光光强的关系,应用小波分解与频带能量比相结合的光强自适应调节算法实现测量系统光强自适应调节功能。进行了相关实验,实验结果表明该光源能够很好地实现锡膏激光扫描三维测量系统的激光光强自适应调节,并能选出最适合测量的激光光强,具有很好的适用性。     

实时荧光定量PCR仪中荧光检测装置的设计

设计了基于LED光源的积分球式聚合酶链式反应(PCR)荧光检测装置。系统采用单色LED作为光源,经过积分球的均匀辐射后,减少光源对样品的影响,再通过光电倍增管与后续电路,得到PCR循环中的实时荧光光强,这有效地减小了荧光检测装置的体积,提高了仪器的性价比。实验通过装置和iCycler-iQ5实时荧光PCR仪的检测数据进行比对,仪器偏差分别为9.44%和25.98%,发现装置具有更高的精确度,更好的稳定性和重复性。     

可调谐激光二极管吸收光谱残余光强调制补偿技术研究

分析了可调谐激光二极管吸收光谱仪器中残余光强幅度调制对谐波探测和全数字化信号处理的影响;搭建了基于电压可调谐光强衰减器(MEMS VOA)的光强残余幅度调制的补偿实验系统平台;实验结果表明,本补偿装置可以把残余光强调制降低到补偿前的1/20,并将其带来的二次谐波线型畸变降低60 %以上;初步证实了利用本方法消除二次谐波畸变并实现全数字化处理的可行性.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.