基于LVDS的高速图像数据存储器的设计与实现

为实现高速图像数据的实时接收存储和有效转发,设计了一种基于Flash的高速大容量固态数据存储器。该存储器以LVDS作为数据传输接口来接收两路高速数字图像数据;用外部FIFO作为图像数据缓存以确保数据接收和存储的并行性;通过FPGA控制整个系统的运行。经实际应用,该系统可成功地完成图像数据的接收、存储和转发功能。     

一种数字图像板测试系统的设计与实现

为了完成对某型号空空导弹中的数字图像板的测试,本文提出了以PCI总线测试计算机为核心的自动测试系统,并完成了软硬件设计。该系统的硬件主要包括PCI总线测试计算机、多块PCI总线接口板卡、基于DSP的通信转接卡、信号发生器、电源调理板卡以及被测图像板。该系统软件部分以Windows XP为开发平台,采用模块化设计思想,实现了图像板各项功能的测试和结果显示。实际的应用表明：该系统具有功能齐全、数据安全可靠、操作方便、人机界面友好等特点,满足了用户需求。     

基于LVDS接口的高速图像数据记录器的设计与实现

为实现高速图像数据的实时接收存储和有效转发,本文设计了一种基于NAND型FLASH的高速大容量固态数据记录器。该记录器以LVDS作为数据传输接口来接收两路独立的高速数字图像数据;用外部FIFO作为图像数据缓存以确保数据接收和存储的并行性;通过FPGA来控制整个系统的运行。经实际应用,该系统可成功的完成图像数据的接收、存储和转发功能。     

基于JPEG压缩图像的数字图像胶囊系统研究

本文研究了基于JPEG压缩图像的数字图像胶囊系统,该数字图像胶囊实现消化道图像采集与无线传送,为消化道疾病诊疗胶囊提供消化道图像信息,实现消化道疾病的诊断,并为体外磁控制提供图像导航信息。该数字图像胶囊系统采用图像压缩芯片CX93510,该芯片能够对通用CMOS图像传感器输出的图像数据进行压缩,其压缩比可配置。本系统选用低功耗CMOS图像传感器OV7740,压缩比为30,极大的减小后端无线传输的数据,降低对无线传输带宽的要求。本文完成数字图像胶囊系统原型样机设计和体外接收系统设计,为消化道诊疗胶囊提供了优异的解决方案。     

极紫外光子计数成像仪图像快显系统设计与实现

为实现极紫外光子计数成像仪数字图像的实时获取,设计图像快显系统,完成数据的实时传输和图像的快速显示。设计了基于USB2.0的数据传输单元完成成像仪与PC工作机之间的数据交互,介绍了数据传输单元的工作原理与组成,采用FPGA+USB控制芯片的结构实现安全、高效的数据传输。对极紫外光子计数成像仪成像原理进行分析,在PC机中进行数据处理,完成图像的快速显示,实现极紫外光子计数成像仪的实时图像测试。经实验验证,本系统可以完成科学数据的实时接收与图像的快速显示功能,满足设备的调试与测试需求。     

基于PCI总线的电视图像处理仿真系统设计

为便于科研人员在电视图像处理系统设计过程中对图像处理的新算法进行评估和测试,降低评估测试板硬件电路的设计复杂性,在此提出了解决方案,并实现了基于PCI总线的电视图像实时仿真系统的设计。该系统首先通过PCI插卡实现对电视图像进行采集、预处理和视频A／D转换,然后选用具有高速特性的PCI总线将数字化后的数字图像信息写入计算机系统内存,最后在计算机终端上,使用高级语言编程,完成图像处理和控制接口软件开发,实现计算机软件对PCI硬件设备的访问,数字图像的实时处理、分割、匹配等算法仿真。     

阵列存储在遥测图像采集系统中的应用

主要研究了阵列存储在遥测图像采集系统中的应用,设计了一种以CPU+FPGA为核心的图像存储转发系统,通过LVDS总线接收数字图像信号,经过阵列存储器缓存编码后,以PCM串行码的形式下传给接收机.阵列存储可以有效缓存图像数据,完成图像数据的缓存和转发功能,实现图像数据的无缝传输.     

多通道数字接收机采集测试系统设计与实现

为了对某雷达接收机的采样信号进行指标测试,设计并实现了一种光接口数据采集测试系统。该系统硬件部分以FPGA为核心完成光接口对8路中频采样模块16位数据的接收,并配备大容量DDR2对数据进行实时存储,以cPCI芯片CY7C09449PV作为数据采集板与上位机的接口,由计算机应用程序进行控制,将采集到的数据传回计算机中进行时域、频域波形显示,以及ADC动态参数、通道参数的计算。经过测试,系统成功实现同时对8通道数据进行接收并且对其中任意4通道数据进行频谱的绘制以及进行指标计算。     

某型导弹飞控系统遥测信息接收装置设计

根据某型导弹飞控系统遥测信息的测试要求,该遥测信息接收装置设计采用全时段、全数据接收的原则。数字遥测信息接收单元以单片机为核心,提高了测试板对数据的自主处理能力;模拟遥测信息接收单元通过信号隔离,减少了设备对产品的影响,高速A/D采集保证了信号测试精度;大容量FIFO实现了数据全时段接收,图谱分析使数据分析及故障甄别更简易准确。     

卫星数据的实时接收与存储

介绍了卫星数据通信中数据的实时接收与存储系统的实现方法。它分为硬件和软件两部分:硬件部分讨论了计算机数据摄入原理和数据摄入卡的设计原理;软件部分给出了数据存储的实现方法,并给出了接收程序流程图。最后,给出了依次原理设计的气象卫星图像接收系统的使用情况。     

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.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

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.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

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.     

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.     

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.