基于LabVIEW和Proteus的单片机数据采集系统设计

为辅助《检测技术与仪表》课程综合实验教学、改善实验教学质量,以单片机数据采集系统为例,提出了基于LabVIEW和Proteus的虚拟数据采集系统设计方法.利用Proteus中的AT89C51单片机作为下位机,实现数据采集、数据显示及向上位机传输数据功能.以LabVIEW软件为平台构建上位机系统,实时采集下位机数据,对采集的数据进行保存和分析处理,按需要回放存储数据.利用Virtual Serial Port Driver 6.0虚拟的一对串口实现上位机与下位机之间的通信.实验结果表明,设计的虚拟数据采集系统与实际系统实验结果一致.     

基于颜色传感器TCS230的氯离子和PH检测仪设计

为了方便对日常用水氯离子和PH精确快速检测,将单片机AT89S52与高分辨率可编程颜色传感器TCS230相结合,提出了一种基于颜色传感器TCS230的氯离子和PH检测的新方法,给出了该仪器的硬件设计电路以及输出检测结果的程序流程。TCS230直接将PH试纸和氯离子试纸的颜色转换成颜色分量,经过单片机处理得到检测结果。     

基于LabVIEW的温度测控系统设计

在一些功能比较复杂的数据采集系统中,通常以PC为上位机,单片机为下位机,由单片机完成数据的采集及对装置的控制,由上位机完成各种复杂的数据处理及对单片机的控制。本文利用LabVIEW图形化编程语言开发设计人机交互界面,STC89C51单片机通过I/O口读取DS18B20的温度数据,上位机通过下位机的全双工串口进行实时通信,完成温度的显示、报警、制表及打印等功能。测试结果表明,该系统性能稳定,界面形象逼真,数据准确、实时性好,具有一定的推广价值。     

基于LabVIEW的多点温度采集实验开发系统设计

文中运用LabVIEW灵活的图形化可视化编程技术,将单片机课程与虚拟仪器技术相结合,设计了基于LabVIEW的多点温度采集处理演示及实验系统.该系统以DS18B20为温度传感器,利用单片机为核心控制器设计了多点温度数据采集下位机系统;利用LabVIEW设计出具有良好界面的多点温度数据采集上位机控制系统.该系统具有实时数据采集、数据显示、数据处理与分析、超限报警以及数据回放等功能.该系统交互性较好,可激发学生的学习兴趣和创新意识.     

基于LabVIEW与USB接口的实时数据采集系统

本文设计了一种基于LabVIEW与STC12C5410AD单片机的数据采集系统。单片机采集到的数据通过CH341T芯片的USB转串口的功能,实现了只用一条USB线就可以把数据传输到LabVIEW中进行显示和分析。从下位机和上位机两个部分阐述了系统的设计。实验证明,系统能实时精确的再现单片机采集的低频信号。     

基于TCS230数字亮度计的设计与应用

TCS230是业界首款带数字兼容接口的RGB彩色光/频率转换器。本文利用其滤光选择功能,并借助单片机设计一种以STC89C51为运算、控制核心,能够同时测量光线中所含的三基色亮度的便携式数字亮度计。实现对颜色数据的采集和处理,并将处理后的数据显示在LCD屏上。简述了利用软件对TCS230的实际颜色测量值进行校正的处理办法,给出了相应的硬件设计电路、软件流程图和测试程序清单。电路具有成本低、测量速度快、精确高、便携等特点,可广泛应用于各种需要对光色成分进行测量、分析与识别的行业。     

基于Lab VIEW的USB数据采集系统的设计与实现

设计采用MC68HC908JB8芯片做为USB通信传输模块的控制核心,利用ATmega16做为数据采集单元的主控单片机。使用LabVIEW软件设计上位机的可视化工作界面,可对接口单元传输的数据进行监测和处理,并可实现对下位机的实时控制。数据采集模块主要采集温度、湿度、电机转速等监测量信息,USB通信传输模块将采集的数据通过USB传输协议传输到上位机,LabVIEW软件对传输到上位机的数据进行显示、分析,并对数据量进行计算,从而控制下位机动作,以达到调节控制的目的。系统硬件工作稳定可靠,软件控制准确,数据采集速度快,实时精度高,并且整机支持热插拔,可应用于工业控制、智能家居等场合。     

基于单片机技术的数据采集系统的设计

介绍了基于单片机技术的数据采集系统的硬件设计和软件设计.该系统以AT89C51单片机为核心,TLC2543作为A/D转换器, 通过RS232通信接口,实现单片机与PC机间的采集数据的传输.该系统分为数据采集传输和数据显示两大模块,数据采集通过单片机控制TLC2543芯片实现A/D转换,并通过RS232实现单片机和PC机间采集数据的传输.数据显示模块,通过在Visual Basic开发环境下,运用VB提供的通信控件MSCOMM来实现上位机对采集数据的收集和显示.     

基于单片机的高精度信号采集系统设计

介绍一种以单片机作为下位机采集数据,并经RS232串口传输到上位机--计算机的数据采集系统的实现方法.在VB开发环境下,运用VB提供的通信控件,实现PC机与89C51单片机之间的串行通信,并对采集的数据进行实时图形化显示、处理,存储等功能并给出硬件结构图和软件流程图.     

基于GPRS的ZigBee协调器网关设计通信

介绍了一种可进行远程监测和控制的数据采集系统.多个测控节点组成ZigBee无线传输网络,利用GPRS模块连接因特网扩展传输范围,与基于LabVIEW的上位机程序进行TCP/IP协议通信,从而实现远程监控.下位机设计了数据帧和采集控制指令;协调器网关可对数据进行选择性接收和处理,并实现断线后自动连接;上位机完成对采集数据的解析、显示以及保存,并能发送控制指令.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.