多元红外探测器元内均匀性测试路径规划方法

针对多元红外探测器测试,提出了一种基于单元响应信号强度分布带中心线探测的元内均匀性自动测试扫描路径规划方法.利用精密六自由度移动台带动探测器敏感面,使红外小光点对其 做二维扫描,可得到有标记元的输出信号强度二维带状分布图,该分布带的中心线方向即为被测元的长度分布方向.结合探测器敏感面的设计尺寸和元间几何拓扑关系.可实现各个元内均匀性自动测试扫描路径的规划,从而有效提高多元红外探测器元内均匀性测试的效率和准确性.     

红外小光点扫描测试系统

介绍了中波和长波“红外小光点扫描测试系统”。该系统由红外聚焦光学子系统，六维精密扫描工件台及数据采集子系统构成。可用于红外焦平面器件重要性能参数如串音、响应均匀性、转移效率的测量，也可用于单元红外探测器有效响应面积和响应均匀性等参数的测量。     

多元红外探测器综合性能参数自动测试系统

针对多元红外探测器过程质量控制和批量检测需求,研究开发了一套多元红外探测器综合性能参数自动测试系统,系统整体噪声水平<2mV,通道增益一致性优于1.60%,实现了动态阻抗、探测率、电压/电流响应率、I-V曲线、启动时间、续冷时间、元间均匀性等参数的全自动测试.针对某型号探测器的测量实验表明,该测试系统具有较好的测量精度和稳定性.     

不同结构长波红外探测器组件的MTF分析

红外探测器组件作为目标探测和成像系统的核心器件,其空间分辨能力直接影响着探测系统的成像质量.评估探测器组件空间分辨能力时,常使用调制传递函数(MTF),而不同的探测器组件结构与其MTF直接相关.介绍了一套弥散斑直径为30μm的红外小光点测试系统,采用扫描狭缝法测试不同结构红外探测器组件的MTF.测试结果表明叠层电极结构侧面存在的光响应会导致线扩散函数(LSF)展宽和次峰等现象,从而造成探测器组件MTF下降,同时0.17 mm和0.30 mm两种芯片和滤光片间距对于探测器组件MTF的影响甚微,该结果为红外探测器组件杂光抑制设计提供了参考.     

红外小光点测试仪

随着红外技术的发展,大视场、高分辨率、高灵敏度的红外系统越来越广泛地采用多元探测器,而随着元数的增加,探测器的面积要求越来越小。多元探测器的性能测试要求有一个光能稳定,光点小于单个探测器面积一定值的测试系统。根据以往的经验,我们认为要实现小光点(可见光点≤50μm)系统必须采取以下两方面措施:1.光学加工总有一定象差,而f_数越小则加工越困难,要保证光加工具有尽可能小的象差,f_数必须足够大。2.根据测量和被测(或发射和接收)两个系统的放大倍率关系式:     

VXI在红外探测器有效面积测试中的应用

介绍基于VXI总线的红外小光点自动测试系统,这套系统能够精确测试红外探测器 有效面积,还可以用于测试红外探测器的空间响应及串音测试。     

HgCdTe红外焦平面阵列像素内灵敏度函数仿真

对于<2的欠采样成像红外搜索和追踪系统,点目标能量集中在单像素内。由于焦平面阵列像素内灵敏度（IPS：Intra-Pixel Sensitivity）存在空间非均匀性,会降低目标的能量和质心测量精度。传统的光点扫描实验测试和数值仿真方法可有效表征和分析IPS,但系统和模型复杂度高、效率低,且实验测试无法分析IPS空间非均匀性与探测器参数的关系。针对上述问题,提出基于蒙特卡洛方法的HgCdTe红外焦平面阵列IPS仿真模型,分析了IPS空间非均匀性的影响因素。结果表明,减小像素中心距或增大吸收层厚度,IPS的空间非均匀性减小;随波长增大,IPS的空间非均匀性增大。该仿真和分析对高能量集中点目标测量精度的提升具有重要参考意义。     

多元探测器芯片测试系统设计

多元探测器芯片测试系统用于多元红外探测器晶片、芯片测试筛选.该设备主要检测晶片、芯片的背景电流、漏电流、动态阻抗和C-V特性等参数,使之满足探测器要求.该设备是各种焦平面阵列红外探测器研制生产的必需设备.论文设计了一套基于Agilent VEE开发环境的多元探测器芯片测试系统.实验表明,设备具有较好的测量精度,达到了预期的设计目标.     

红外长线列探测器位置错位校正方法

红外长线列探测器在扫描成像系统中正得到越来越多的广泛应用,相应的遥感图像预处理工作的重要性也日渐突出,红外长线列探测器位置校正是遥感图像预处理的重要组成部分,对其方法的研究有着重要的实用价值.针对多元红外长线列探测器模块内像元错位和模块闻位置错位,提出并用FPGA实现了一种红外长线列探测器位置错位实时校正方法.实验结果表明该方法效果良好,可以有效的消除图像错位畸变,提高图像质量.     

红外点元探测器扫描成像方法研究

针对传统红外面阵探测器成像存在分辨率低、视场范围窄、非均匀性的问题,提出一种基于红外点元探测器的扫描成像方法。该方法首先利用微型电机驱动扫描镜依次获取物体表面的红外热斑,经光学镜头聚焦到红外点元探测器,进行光电转换;然后经信号处理板采集、处理后生成红外灰度图像;最后利用多阈值分割的伪彩色映射模型,将灰度图像转换成伪彩色图像。实验结果表明：红外点元探测器扫描成像方法能够实现红外场景的大视场、高分辨率成像,且点元探测器加工制造简单,价格低廉,有效突破了传统大面阵成像的高昂成本限制,更加有利于红外成像技术的推广和应用。     

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.