基于DDS技术的发动机地面起动系统检查仪

介绍了发动机起动系统电路检查仪原理,该测试仪采用的微处理器是W77E58,通过DDS模块产生正弦信号,模拟空气发生器转速信号。采用LED实时监控发动机控制盒状态。经过试用,该检查仪测试性能可靠,使用方便,操作简捷。     

PXI在发动机测试中的应用

发动机被称为飞机的“心脏”,其重要性是不言而喻的。发动机试车台是试验全尺寸发动机的设备,它的主要任务是为新机研究、试验型号进行批准试车,批生产机种的排故、改进和延寿等进行试验。数据采集系统是现代试车台的重要组成部分,它的任务是获取发动机的各种试验数据及     

PXI在发动机测试中的应用

发动机被称为飞机的“心脏”,其重要性是不言而喻的。发动机试车台是试验全尺寸发动机的设备,它的主要任务是为新机研究、试验型号进行批准试车,批生产机种的排故、改进和延寿等进行试验。数据采集系统是现代试车台的重要组成部分,它的任务是获取发动机     

基于PC104的某型航空相机综合检测系统

针对某新型航空相机系统的特点,提出基于PC104单板机的综合检测系统,介绍检测系统的总体结构与组成,描述系统硬件及软件设计。该系统利用嵌入式工控机技术、数据采集技术、总线数据仿真技术以及虚拟仪器技术,实现对相机机身、操纵器的单独测试;相机的联试以及飞机导航数据的仿真等功能,能够辅助机务人员快速地进行通电检测,并给出排故建议。经实验证明,该综合检测系统可按维护规程要求实现对相机系统性能的全面检查,满足设计要求。     

NXPP89LPC901单片机汽车起动保护控制器设计

在汽车发动机起动时,若发动机起动后起动机不能及时断电,将会烧毁起动机或损坏飞轮齿环;若变速器不在空档位置起动,则起动机的瞬间动力将使汽车位移,还可能引起交通事故和人身安全.为此介绍一种利用NXP P89LPC901单片机控制的汽车起动保护控制器,通过检测汽车起动开关、变速箱档位、发动机转速,实现对汽车发动机起动过程检测和保护.起动保护控制器在发动机起动过程中通过采用逐个关闭打开负载系统,解决汽车发动机过程中因起动电流大而对汽车电源的冲击影响,延长了电瓶寿命.     

航空发动机电气附件绝缘故障分析与性能测试

绝缘性能是航空发动机运行及维护中的一项重要指标,关系到飞机的飞行安全。针对航空发动机电气附件两类关键的绝缘故障进行了仿真分析,明确了绝缘电阻值与绝缘性能间的关系。在此基础上,设计航空发动机电气附件绝缘性自动测试系统。系统采用硬件设备与上位机软件控制相结合的模式。硬件系统包括高阻测量模块、控制模块、动态组合切换模块及转接线缆等。软件系统采用基于不同型号发动机数据库的组件化程序设计思路,实现硬件模块间的通信控制、测量逻辑控制、绝缘性测量回路建立、人机交互及数据报表生成与存储等功能。该系统可一机多用,配合相应的转接线缆,可实现全部型号发动机的绝缘性自动测试需求,测试精度与测试速度得到大幅提高。     

体系化的飞机/悬挂物电气连接系统技术研究

针对国内各类飞机平台与大中型、小型及微型等武器类悬挂物在设计集成时飞机/悬挂物电气接口通用化水平亟需提高的问题提出了一种系统化的解决方案.首先,阐述了国内外飞机/悬挂物电气连接系统相关技术的发展趋势及相关标准的发展情况;然后,分析了飞机/悬挂物电气连接系统标准簇的组成及其信号组的演变情况;最后,提出了飞机/悬挂物电气连接系统标准体系化贯彻的思路和方法,并简要说明了其应用前景.     

便携式发控装置电气调试系统设计

为了模拟飞机、两型发射架及导弹的电气信号特征,实现凉性发射装置及其配套发控盒研制过程中调试、系统联试功能一体化,设计开发了某型便捷式发控装置电气调试系统;介绍了该系统的总体设计、硬件配置、适配器的设计、软件工作流程等;经测试,该系统安全、可靠,完全满足设计要求。     

基于虚拟仪器的机载电源在线检测系统

介绍一种机载电源在线检测系统。该系统基于虚拟仪器技术，上住机软件采用LabWindows／CVI6．0开发，硬件电路的主控芯片采用AT89C51单片机。系统实现了飞机检修过程中机工电源的动态检测和故障定位，具有检测结果实时、故障诊断准确等特点。     

火箭发动机包覆层表面缺陷检测系统研究

固体火箭发动机包覆层质量直接影响到发动机的工作性能,对包覆层表面缺陷检测系统的研究具有重要的实际意义.针对某型号固体火箭发动机,提出了包覆层表面缺陷检测系统的设计与实现方案,包括硬件和软件的组成和部署;采用了电气自动化和图像模式匹配等技术,实现了包覆层表面的自动拍照、缺陷检测及缺陷信息的保存;依据图片的几何学特征和光学...     

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.     

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 rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks