射孔器枪内压力测试系统研究及壳体防护

油气井井下环空压力不能直观反映射孔过程,测取射孔/压裂过程中射孔器枪内压力对优化油气井射孔工艺及评估射孔弹威力有着直接联系,射孔器枪内环境和被测信号的特殊性对测压仪器的外壳及内部测试电路具有严格的要求。并结合实际使用的反馈效果对原有仪器壳体进行了弹塑性分析,针对由射孔弹轰爆导致的壳体形变做了进一步的防护措施。     

基于单片机的微型存储式电子测压器设计

针对现有膛压测试仪体积较大,不能满足中小口径火炮膛压测试需求的问题,本文采用存储测试技术、低功耗技术和微型化技术设计了体积为22cm3的电子测压器。该仪器充分利用单片机的片内资源,解决了系统微型化的关键问题,采用先进的电源管理技术实现了系统低功耗。它能够在发射现场实时记录膛压曲线,具有体积小、能承受600MPa高压、功耗低、无引线等优点。靶场实测结果表明设计的微型电子测压器的可靠性和测试精度满足膛压测试要求,准确可靠的测试数据能为兵器的研制和验收提供依据。     

壳体电容式电子测压器动态校准系统的合理性研究

针对微型电子测压器在实测过程中受到环境因素影响比较大,且将测压器置于实炮内进行实测校准的理想校准方法成本高、周期长等问题,提出了一种电容式电子测压器的动态校准方法。该方法采用模拟膛压发生器对微型电子测压器进行准动态校准,分析动态校准系统组成和工作原理,通过对标准传感器的特性和环境相似性的分析表明,对电容式电子测压器进行应用环境下校准的测试系统是满足要求的,这种校准方法也能有效用于动态高压的测量。     

微小型放入式电子测压器的研究

为满足多种火炮、弹箭内弹道压力参数测试需求,研制微小型放入式电子测压器。介绍研制微小型放入式电子测压器的现实背景和意义,阐述测试系统的工作原理,详细分析整个系统工作状态设计及实现．并给出该系统的典型应用。该测压器功耗低、体积小、能够承受600MPa压力,可在现场实时实况地记录被测弹体射击过程膛压变化状况,并能够在系统掉电的情况下保持测试所得的数据,便于回收上电后准确的回放所记录的数据以供分析。     

微小型放入式电子测压器的研究

为满足多种火炮、弹箭内弹道压力参数测试需求,研制微小型放入式电子测压器.介绍研制微小型放入式电子测压器的现实背景和意义,阐述测试系统的工作原理,详细分析整个系统工作状态设计及实现,并给出该系统的典型应用.该测压器功耗低、体积小、能够承受600 MPa压力,可在现场实时实况地记录被测弹体射击过程膛压变化状况,并能够在系统掉电的情况下保持测试所得的数据,便于回收上电后准确的回放所记录的数据以供分析.     

井下压力测试系统的低功耗设计

测取射孔瞬间的动态参数对评价射孔过程具有十分重要的意义,是研究、勘测油田不可缺少的技术。为获得射孔过程中井下的动态压力数据,研制了一种油井测压器。该测压器采用存储测试技术,实时记录射孔及压裂时井下环空压力的变化。测试系统依靠自带电源来保证整个测试过程供电,由于测试系统受到体积的限制,电池体积和容量也较小。针对实测环境对石油井下测试系统进行了低功耗设计,其总体功耗计算和实测结果表明,该测试系统满足井下压力测试方法的要求,从而验证了低功耗设计的有效性。     

基于LabVIEW的假脚位移载荷特性测试仪设计

使用目前测控领域新型的虚拟仪器技术及LabVIEW7.0软件开发平台,结合测试系统功能要求,分别利用拉压式压力传感器SDEF和光栅传感器采集压力和位移信号,阐述了基于LabVIEW的假脚位移载荷测试仪的设计,给出了系统硬件和软件设计思路.该测试仪能够测试出假脚材料的压力与位移等力学特性,为开发精密、舒适的假脚产品提供参考依据.     

4G发牌引领测试需求全面提升

正中国目前在电子工业领域已经成为全球最大的基地,在移动通信、军工、元器件、汽车电子以及教育领域,都会出现新的要求和市场,对于测试测量方面主要是两个方面的趋势,一个是通用类仪器的低成本和功能化测试,另一个方面是用于高端认证研发领域的需求,具体体现在被测设备的动态性能指标的测试,甚至是在真实的或模拟真实环境条件下的性能测试,再有就是综合性的指标参数的测试。     

物镜鉴别率对比测试研究

本文介绍了自行设计研制的目视鉴别率测试仪及其光路图和鉴别率图案,着重介绍用该仪器与在光具座和传递函数仪上的对比测试,被测试的物镜,在３种仪器上被测时偏心较大,然后该物镜进行重新装配,校正中心,又一一测试数据,最后给出初测和复测对比测试数据,用３种方法测出的物镜的数据,在判定物镜优劣性能时甚为一致。     

S参数测量中针对夹具或探头的新一代去嵌方法

1S参数测量中何时需要去嵌?对于相当多的被测试产品,如接插件、使用插槽的电路板等,都需要使用专门的夹具才能进行S参数测试。这是因为这些被测件的接口通常是非SMA或者BNC等通用接口类型的,而S参数测试仪器如SPARQ、VNA等仪器的连接接口通常都是SMA或者BNC等标准类型的,因此,被测件和测试仪器的连接需要辅助夹具。如图1所示,它们是一些需要夹具才能够进行S参数测试的被测件(图1左下脚图片为Teledyne LeCroy(力科)的信号完整性S参数测试仪)。     

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.     

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.