某型红外热像仪结构改进设计研究

红外热像仪机械环境可靠性是其结构设计最为重要的指标之一.为保证红外热像仪能够经受服役的振动环境,本文以某型红外热像仪故障闭环为契机开展失效机理及结构改进设计研究.基于动态试验结果对红外热像仪有限元模型进行修正.采用有限元数值方法和随机振动疲劳失效理论相结合对故障的产生机理进行了推测.根据分析结果重新对结构改进优化并通过...     

对某型红外热像仪可靠性增长的研究与改进

热像仪的可靠性水平会直接影响使用者任务成功率、维护成本及寿命周期,因此其可靠性设计工作越来越受到关注。同时,就目前国内热像仪研制情况而言,研制样机的可靠性并不能反映小批量生产产品的可靠性水平。因此,为充分反映研制样机的可靠性水平,本文主要研究了某型热像仪在研制过程中的可靠性增长方法,分析了红外热像仪的故障,建立了红外热像仪的任务可靠性模型,提出了相应的改进措施,并采用可靠性增长的办法来验证所提措施的有效性。本文所提改进措施满足装备试验鉴定要求,可实现热像仪的可靠性增长和批量产品可靠性不降低的目标。     

基于红外热像仪的海上油田安防系统设计

海上油田安防系统中的红外热像仪在有雾天气及夜间都可以对海底管缆区域进行有效的监视,具有全天候监视的优势.对基于红外热像仪的海上油田安防系统进行了设计,给出了系统的设备组成.分别对单个红外热像仪系统和红外热像仪与AIS相结合的联合系统进行了设计,并对联合系统的显控软件进行了设计.     

混凝土结构物与植物叶片之红外热像侦测研究

红外热像仪准确量测温度的主要关键为物质的发射率.红外热像仪常用于战区侦测,但战区目标物常以植物绿化达到伪装效果.为此基于能量平衡法则,建立叶片发射率仿真模型,可用以估算叶片发射率.另外以红外热像仪分析±0.5℃微小温差环境中混凝土结构物与植物叶片之红外热影像,实验结果显示两种目标物红外热像平均温度与红外热像仪发射率参数设定值的回归直线相当接近,但两种目标物平均温度标准误差与红外热像仪发射率参数设定值的回归直线明显不同.混凝土与叶片具有不同的红外热像性质,此一发现将有助于提升红外热像仪对微小温差目标区的侦测能力.     

红外热像测温技术及其应用研究

阐述红外热像测温技术的工作原理和红外热像仪的基本组成,综述了红外热像仪测温技术的发展,从技术层面剖析了红外热像仪测温存在的问题,介绍了国内外在红外热像测温技术方面的研究热点,例举了利用红外热像仪进行温度场测量的应用实例,同时展望了未来的发展方向.针对红外测温领域中的理论、仪器及应用进行了较为详细的分析和总结.     

连续变焦红外热像仪结构设计及装调工艺研究

本文研究了连续变焦红外热像仪的结构设计和装调工艺。在设计阶段进行了振动、冲击仿真分析。提出了连续变焦组件的光机装调工艺方法。搭建了小视场与安装基准偏轴度的测量方法。完成了该红外热像仪的光轴一致性检测和光轴稳定性验证试验。检测和试验验证结果表明各项关键机械性能指标优良,证明该红外热像仪的整机系统结构设计满足工程化应用需求。     

一种长焦大变倍连续变焦光机组件结构设计及装调

介绍了一种基于长焦大变倍比连续变焦红外热像仪的结构设计及装调方法。可用于各类红外热像仪的变焦结构设计中,在保证图像清晰的前提下,能够明显改善连续变焦过程中的光轴晃动,提高红外热像仪的光轴一致性和光轴稳定性,控制焦距精度,降低红外热像仪装调难度。该结构采用双导轨配合步进电机组件化设计,相对于其他变焦结构的设计,该结构变焦过程中光轴一致性好,光轴晃动量小,通用性强。     

基于红外热像仪的涂层波段发射率测量

简要介绍了红外热像仪测量涂层发射率的原理,详细介绍了基于红外热像仪的涂层波段发射率测量装置设计与测试方法,实际测试发射率0.708～0.920之间的4个标准样品,误差均不大于2.06%.     

基于NIOS II的红外热像仪系统通讯数据处理研究

针对红外热像仪系统的通讯数据处理模块,详细描述了一种基于NIOS II软核处理器的红外热像仪系统通讯数据处理设计方案,该方案运用SOPC进行硬件设计并通过标准C语言实现通讯数据处理,最后通过Altera公司的EP38SL150F1152I3芯片,对方案进行硬件实施和验证,证明提出的方案可以快速有效地实现红外热像仪系统通讯数据的处理和分类。     

在线自动聚焦红外热像仪系统设计

红外热像仪具有全天候成像、环境适应性强、非接触测温等优点,被广泛应用于国民经济的各个领域.本文设计了一套可组网的自动聚焦红外热像仪系统.系统主要分为3个部分:①红外热像仪成像组件,包括可变焦红外成像光学镜头和非制冷红外焦平面探测器;②自动聚焦闭环控制组件,包括FPGA图像评价单元、电机反馈控制单元和聚焦搜索算法;③红外热像仪网络化监控嵌入式组件,包含视频压缩编码、私有网络控制传输协议、OSD(on-screen display)温度叠加等功能.该系统可广泛应用于港口码头、石油化工、危险品仓储等领域,并将逐步成为这些领域事故预判和报警的重要安全监控设备.     

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.     

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.     

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.     

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.     

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.     

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.