一种可调线阵CCD信号采集处理系统

在线阵CCD信号采集系统中,实时更改CCD芯片的驱动脉冲频率和光积分时间可以提高整个系统的测量精度,为此设计了一种基于FPGA的线阵CCD信号采集处理系统,此系统可以灵活地调节CCD驱动波形,并可以根据CCD的输出信号调整FIR数字滤波单元的截止频率.系统通过USB2.0接口接收PC机的设定参数对CCD驱动单元和FIR数字滤波单元进行配置,然后将处理数据上传至PC机.实验结果表明:系统控制灵活、集成度高,能够满足线阵CCD信号采集系统多种应用场合的需要.     

掌形仪数据采集系统的设计

人体掌形识别对掌形数据的准确性要求很高,这对数据采集电路的低噪声和准确性提出了更高要求.根据CCD图像传感器需复杂驱动时序和空间采样离散模拟信号输出的特点,采用FPGA做CCD时序驱动电路、用前置电路对CCD输出信号做后级处理.由DSP对CCD数据进行A/D采集后存储到外扩大容量SDRAM存储器中.由实际硬件电路测出的实验结果表明,系统的可靠性、稳定性很好.为掌形识别系统提供了准确的数据保证.     

一种高速光栅图像采集系统的设计

为了解决光栅测试复杂和测试设备昂贵的问题,设计了一种从采集到显示的光栅图像高速采集系统。该采集系统基于ARM微控制器STM32F103、USB2.0和线阵CCD芯片TCD1209D。通过ARM芯片的GPIO模拟CCD工作时序,用软件编程的方式配合辅助电路实现了其驱动时序。然后利用STM32F103的片内AD和USB2.0控制器,实现了CCD信号的采集和USB传输,在PC端编写了图像显示软件。结果表明,CCD输出带明暗条纹的光栅图像信号,通过USB传输,PC上的图像采集软件中能正确显示出该光栅图像信号的图像。     

基于LPC2148的步进电机调速和测速系统设计

为了能够快速精确地控制步进电机,采用LPC2148和L298型驱动器精确控制频率输出,实现对电机进行简单有效地调速和基于闭环反馈的转速测量.给出硬件设计的总体框图,详细叙述了调速和测速系统的设计原理与软件实现方法,对L298型步进电机驱动电路进行分析,给出LPC2148与L298的硬件连接电路.以及电源模块和通信接口的设计方案.经过试验验证:该系统电机转速误差控制在±0.2 m/s以内,简化了外围电路设计,提高了系统性价比.     

基于线阵CCD的尺寸测量装置数据采集系统设计

电荷耦合器件(CCD)作为一种新型的光电器件被广泛地应用于非接触测量物体尺寸。CCD通过必要的光学系统和适合的驱动电路完成光电转换,将物体在空间域分布的光学图像转换成一列按时间域分布的电脉冲信号。以线阵CCD图像传感器TCD1251UD为例,设计了视频信号预处理电路,并采用可编程逻辑器件FPGA实现积分时间和频率同时可调的CCD驱动程序,完成了对CCD输出信号的数据采集。实验结果证明时序脉冲能够驱动CCD完成光电转换功能,数据采集电路能够采集到需要的信号数据。     

基于FPGA的高速长线阵CCD驱动电路

高速长线阵CCD相机主要用于航天推扫系统等高速图像数据的采集。本文以DALSA公司生产的IL-P4线阵CCD为例,研究了一种基于FPGA的高速线阵CCD驱动电路的设计方法,首先,分析了线阵CCD的基本结构和工作原理,并阐述了IL-P4驱动信号的时序要求。在ISE 13.4开发系统上,运用Verilog描述的分频器,设计了基于Xilinx公司的Spartan 3E平台的驱动电路。最后,采用ISIM软件进行仿真,并用示波器测试出FPGA输出的驱动脉冲。仿真和实验结果表明,FPGA输出结果完全符合IL-P4的高速驱动信号时序要求。本研究对长线阵高速CCD驱动电路的设计与实现具有较好的参考价值。     

机载紫外DOAS成像光谱仪CCD成像电路的设计及实施

机载紫外DOAS成像光谱仪通过获取大气与地表的折射或散射的紫外光辐射,监测大气痕量气体的分布与变化,其电子学部件的重要组成部分为CCD成像电路。采用帧转移型面阵CCD-47-20为图像传感器,以现场可编辑门阵列（FPGA）为核心控制器的成像电路模块,设计并实现了一套完整的机载紫外光谱仪成像系统。CCD成像电路完成包括CCD驱动时序电路、CCD数据采集电路,接收CCD模拟图像信号产生数字图像信号,将数字图像信号通过差分芯片驱动以低压差分信号（LVDS）传输给机载通讯系统等功能。讨论了机载紫外成像光谱仪的设计过程,并重点讨论了CCD成像电路的设计过程。设计的机载紫外DOAS成像光谱仪系统成像分辨率为0.286。实验证明满足大气污染气体的观测需求。     

基于CPLD与CCD的光谱测量数据采集系统设计

介绍了CCD的工作原理和相关双采样的原理,设计了一种基于CPLD与CCD的数据采集系统。利用Verilog语言编程产生CCD和AD9844的驱动时序,AD9844对CCD输出信号进行相关双采样并进行A/D转换,采集到的数据存储至外部存储器。最后,用单片机实现与计算机的串口通信,完成将存储器中的数据传输至计算机。该系统完成了光谱测量数据的快速采集、存储及数据处理,并进行了实验验证。结果表明,该系统具有电路结构简单、成本低、程序修改方便等特点,在光谱分析领域具有一定的应用价值。     

基于DSP的线阵CCD数据采集系统设计

DSP系统具有高速、小型化、稳定性好、精度高和集成度高等特点.本文设计了一种基于DSP技术的线阵CCD数据采集系统,以TMS320VC5502型DSP和TLV1572型A/D转换器为例,分析了CCD输出数据和A/D转换数据的工作时序,详细介绍对线阵CCD输出视频信号的数据采集过程,并通过MAX232器件把采集结果传给PC机.该系统设计方案电路简单,可靠性好,易于实现,具有一定的通用性.     

基于线阵CCD的降水粒子探测高速数据采集系统

针对线阵CCD图像扫描技术探测降水粒子的情况,设计了一种基于高速模数转换器(ADC)、先进先出缓存器(FIFO)和数字信号处处理器(DSP)的线阵CCD数据采集系统。能实现以该线阵CCD驱动时序最高频率16.6 MHz的数据采集,系统运行稳定;数据存储和处理循环进行,保证信号转换的稳定性和避免数据存储丢失;详细描述前端调理电路、数据采集系统的原理、硬件构成和逻辑控制模块,给出了数据处理算法设计和系统试验结果。     

Technology innovation and process integrations for sub-100nm gate patterning

This paper presents a brief overview of the Applied Centura(R)DPS(R)system,configured with silicon etch DPS Ⅱ chamber, with emphasis on discussing tuning capability for CD uniformity control. It also presents the studies of etch process chemistry and film integration impact for an overall successful gate patterning development. Discussions will focus on resolutions to key issues, such as CD uniformity, line-edge roughness, and multilayer film etching integration.     

White organic light-emitting devices based on fac tris（2- phenylpyridine） iridium sensitized 5,6,11,12-tetraphenylnap -hthacene

We have fabricated the white organic light-emitting devices （WOLEDs） based on 4,4＇ -bis（2,2 -diphenyl vinyl）-1,1＇ - biphenyl （DPVBi） and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene （rubrene）. The device structure is ITO/2T-NATA （20 nm）/NPBX （20 nm）/CBP： x%Ir（ppy）3：0.5% rubrene （8 nm）/NPBX （5 nm）/DPVBi （30 nm）/Alq（30 nm）/LiF（0.5 nm）/A1. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris （2-phenylpyridine） iridium [Ir（ppy）3], acts as a yellow light-emitting layer, and N,N＇ -bis- （1-naphthyl）- N,N＇ -diphenyl -1, 1＇ -biphenyl-4,4＇ -diamine （NPBX） acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir （PPY）3 is 6wt%, the maximum luminance is 24960 cd/m^2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V.     

Complete approach to automatic identification and subpixel center location for ellipse feature

To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. In the method, the feature area is identified automatically based on the edge attribute, and the sub-pixel center location is accomplished with the leastsquare algorithm. It shows that the method is valid, practical, and has high precision by experiment. Meanwhile this method can meet the need of instrumentation of visual inspection because of easy realization and without man-machine interaction.     

小角度扩展相关性近似算法分析

本论文提出一种在多天线MIMO信道相关性建模中小角度扩展近似理论算法,并应用于分析MIMO系统性能。分析中分别对三种不同角能量分布情况下的空间相关性研发快速近似计算法,并同时提出双模(Bi-Modal)角能量分布情况下的近似运算。通过分析这些新方法的近似效率,可以得到计算简单、复杂度低、而且符合实际的MIMO相关信道矩阵,对系统级的快速高效计算法的研究和系统级的评估以及误差分析具有重要的意义。     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

A Versatile Mixed-Signal Pin Approach for Cost-Effective Test of Automotive ICs

Integrated circuits (ICs) intended for increasingly sophisticated automotive applications bring unique test demands. Advanced ICs for applications such as highly integrated automatic braking system (ABS) and airbag controllers combine high voltage digital channels, significant VI demands and precise timing capability. Along with continued missioncritical reliability concerns, the trend toward higher voltage operation and increased device integration requires specialized test capabilities able to extend across the wide operating ranges found in automotive applications. Among these capabilities, automotive test requirements increasingly dictate a need for a cost-effective versatile mixed-signal pin electronics with very high data rates reaching up to 50MHz with a voltage swing of-2 V to +28 V.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.     

Optical vibration and deviation measurement of rotating machine parts

It is of interest to get appropriate information about the dynamic behaviour of rotating machinery parts in service. This paper presents an approach of optical vibration and deviation measurement of such parts. Essential of this method is an image derotator combined with a high speed camera or a laser doppler vibrometer （LDV）.