低红外发射率材料研究进展

低红外发射率材料是目前公认的可实现飞行器红外隐身的特种功能材料。现已报道了纳米复合薄膜、单层(多层)膜结构材料、树脂/金属复合涂层、树脂/半导体复合涂层、核壳结构材料等多种类型的低红外发射率材料。介绍了上述低红外发射率材料的优缺点及最新研究进展,指出低红外发射率涂层的理论研究、红外与激光兼容隐身材料、树脂/半导体复合涂层及红外光谱选择性低发射率涂层是未来的重点研究方向。     

影响低发射率涂层与超材料吸波体兼容的关键因素探究

为了实现8~14μm波段低反射率涂层与超材料吸波体的兼容隐身,探究了影响低发射率涂层与超材料兼容性能的关键因素。采用IR-2型发射率测试仪测定涂层在8~14μm波段的发射率,用弓形法测量了超材料涂覆涂层前后的反射损耗曲线,并采用矢量网络分析仪测试了涂层电磁参数。结果表明,涂覆低发射率涂层后,可将超材料吸波体的红外发射率降至0.126,但是其对超材料吸波体原有吸波特性影响较大,平均反射损耗以及吸收带宽都有所减小。在涂层4个电磁参数中,介电常数实部为影响低发射率涂层与超材料兼容的关键因素,低发射率涂层的介电常数实部较高,导致本征阻抗较小,与自由空间的阻抗不匹配,对雷达波的反射较多,涂覆后对超材料吸波体原有反射损耗特性影响大。     

红外隐身涂层的制备及其与雷达吸波涂料的兼容性研究

采用双层涂覆的方法制备了雷达.红外隐身兼容涂层,研究了红外隐身涂层的填料种类、含量以及涂层厚度对雷达隐身涂层吸波性能的影响,通过优化条件得到对雷达吸波性能影响最小的红外隐身涂层.实验结果表明,用双层涂覆的方法,以特殊形态片状微米级铝粉作为顶层红外隐身涂层的填料,填充量为40%,且涂层厚度达到20μm时,涂层的红外发射率可达0.15左右,其对底层雷达吸波层吸波性能的影响较小.     

聚氨酯涂料红外发射率性能研究

文中主要通过对聚氨酯作为成膜物质时其红外性能和物理化学性能研究,通过加入纳米改性填料和改变涂装工艺的方法来降低其红外发射率,同时涂膜具有优良的物理化学性能.通过研究,用聚氨酯作为成膜物质,纳米NiO包覆片状铝粉和SiO2粉等为填料,得到了浅绿色涂层的红外发射率仅为0.39,具有一定的红外隐身与可见光隐身、雷达隐身相兼容效果,同时发现涂层的电导率、磁导率对涂层的红外发射率的影响也很大.     

红外隐身材料的研究现状与进展

红外探测系统的快速发展促进了对红外隐身材料的广泛研究。红外隐身材料主要是对目标的红外辐射能进行调控,主要措施是控制目标表面红外发射率和目标表面温度,使目标与背景环境的辐射能相融合,进而达到隐身的目的。概述了红外隐身的基本原理,综述了低发射率涂层材料、控温涂层材料和智能隐身材料等红外隐身材料近几年的国内外研究现状,并展望了红外隐身材料的未来。     

国内外红外隐身材料研究进展

从红外探测系统的探测方法和Stefan-Boltzmann定律两个方面分析红外隐身材料的隐身原理,得出红外隐身的主要措施有降低目标表面红外发射率和控制目标表面温度。综述了低发射率涂层材料、控温涂层材料、智能隐身材料和生物仿生隐身材料等四种红外隐身材料近几年的国内外研究现状。指出了目前红外隐身材料研究存在的问题,在此基础上,展望了红外隐身材料未来的发展方向。     

红外/雷达兼容隐身材料的研究现状与进展

随着各种新型探测雷达、先进红外探测器和精确制导武器的相继问世,红外/雷达兼容隐身材料已经成为了目前隐身技术研究的重点。综述了传统和新型红外/雷达兼容隐身材料的隐身原理和研究现状,并对未来红外/雷达兼容隐身材料的发展方向进行了总结与展望。     

红外隐身涂层光谱发射率测量定标研究

受涂覆工艺、物理特性和气动应力等因素影响,飞机红外隐身涂层容易产生裂纹、剥落等损伤.监控涂层光谱发射率是红外隐身涂层状态监控的一种有效手段.光谱发射率监控设备的定标直接影响涂层光谱发射率测量结果的可信度,进而影响飞机红外隐身特性的评估结果.针对光谱发射率测量定标需求,研究了积分球定向积分反射比测量系统定标方法,并开展红...     

兼容性隐身材料的研究进展

随着军事探测技术的逐渐成熟,各种隐身材料都面临着巨大的挑战,尤其是单一隐身材料,所以兼容复合隐身材料就成了研究重点。本文从材料的角度上介绍了雷达、红外、激光及兼容隐身原理,揭示了兼容隐身的方法,对现有雷达红外、激光红外、激光雷达和雷达红外激光兼容隐身材料的研究现状与原理做了简述,并对未来兼容隐身材料的发展方向做了总结与展望,并指出质轻、料薄、智能、宽波带、强吸收是未来隐身材料发展的趋势。     

红外雷达复合隐身技术探讨

简要介绍了目前红外、雷达隐身技术的现状和存在的问题,并对国外目前研究的掺杂氧化物半导体材料、导电聚合物、视黄基席大碱盐、涂覆金属空心导电微珠和纳米吸波材料等新型红外雷达兼容隐身材料进行了详细探讨,最后沦述了红外雷达复合隐身涂层技术的隐身机理和发展现状.     

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.     

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     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.