响应波段外激光辐照PC HgCdTe 探测器系统实验研究

文中对多元多光谱红外探测器系统响应波段外激光的辐照效应进行了深入的实验研 究并对实验结果进行了分析。以1. 06μm 激光辐照三元光导型碲镉汞探测器系统的实验为例,说明了系统响应波段外激光辐照效应的实验规律。实验结果发现:探测器对系统响应波段以外的激光仍有响应信号,但响应规律与对波段内激光的响应不同,出现新的现象。研究表明: Ge 窗口被激光加热是导致探测器输出信号的根本原因,信号输出曲线由探测器的电阻～温度特性决定。     

波段外CW CO2激光辐照HgCdTe探测器热效应研究

报道了用波段外连续波CO2 激光辐照HgCdTe探测器 (PC ,PV)时 ,观察到的一些与波段内激光辐照探测器时大不相同的实验现象。研究表明 ,波段内激光辐照探测器时 ,探测器的主要响应机制是光效应 ,而波段外激光辐照探测器时 ,热效应起主要作用     

激光辐照对光导型探测器性能的影响

对比研究了光导型探测器在激光辐照前后对信号的输出响应特性,发现在受到较高功率但低于永久损伤阈值的激光辐照之后,探测器系统对相同信号的输出响应有了较大程度的改变。分析表明：在使用较高功率密度激光对探测器进行处理后,探测器系统的散热性能有了改善。根据缺陷的退杂化模型对探测器预处理前后性能的改变进行了分析,对实验现象进行了解...     

波段内激光辐照光电探测器的光热效应实验研究

以1.06μm激光为例,使用PC型HgCdTe探测器,从实验的角度全面给出探测器各种可能的激光响应结果;同时给出响应波段内激光辐照探测器时光、热各自作用及光热综合作用的实验曲线,并结合此结果以清晰直观的图像分析了波段内激光辐照光电探测器时各种响应结果的成因.研究表明:激光辐照过程中,探测器信号响应曲线是光、热综合作用的竞争结果;激光停照后,信号曲线仅反映探测器的热恢复过程;光电导探测器的光响应和热响应随工作温度的变化均存在峰值响应.探测器的工作温度、激光功率密度和辐照时间是影响探测器信号响应曲线行为的关键参数.     

线阵碲镉汞探测器对纳秒脉冲激光的反常响应规律及机理

利用纳秒激光辐照PV型线阵HgCdTe探测器的局部光敏元,获得了该类器件损伤前被辐照和未被辐照像元输出信号随激光能量密度变化的全部响应规律,指出基底信号二阶段响应和光信号六阶段响应的规律特点,同时给出不同响应阶段激光能量密度阈值范围;发现了基底信号整体跃变的零压输出、光响应信号输出凹陷-回升-凸起等反常响应现象;并从探测器读出电路和热生电动势的角度揭示了反常响应现象的产生机理,希望能加强对阵列型HgCdTe探测器光响应特性的深刻认识,为该类器件的技术创新提供启示。     

强激光辐照PC型探测器的动态响应

基于载流子输运和强激光辐照会产生热效应造成探测器的温升,建立了描述光导(PC)型半导体探测器对激光辐照动态响应的动力学模型及非线性耦合方程组。通过进行数值模拟计算,得到了激光辐照PC型半导体探测器的动态响应情况,数值模拟结果与实验结果相吻合。该模型能适用于任何强度的激光辐照,弱激光辐照时结果与传统模型一致,强激光辐照时能描述探测器的信号饱和效应。     

基于CTIA的PV-HgCdTe线阵近红外激光响应特性

使用超连续谱激光辐照PV 型线阵HgCdTe 探测器,探测到了线阵器件输出信号随光照强度变化的全过程,发现了被辐照单元过饱和降压、低压稳定输出的反常响应规律;同时,未被辐照单元也存在响应。在总结实验响应规律的基础上,给出了各不同响应阶段功率阈值范围,并分别对辐照单元出现的过饱和降压、低压稳定输出等异常现象及未被辐照单元存在的整体降压反常响应现象进行了深入研究。研究认为采用CDS 相关双采样电路使器件的基底信号在强光下存在光响应是造成辐照单元异常响应的主要原因;而器件内部公共P 级结构、电路共用Vref 电压结构是导致未被辐照单元反常响应输出的主要因素。     

激光停照后探测器继续升温现象的实验研究

文章针对探测器组件,研究了响应波段内、外激光辐照停止后,组件内探测器的热恢复过程.实验发现激光辐照停止后,组件内探测器存在继续升温的新现象.研究表明,此现象是器件整体结构所致,Ge窗口或滤光片对激光能量的吸收是导致温升的直接原因.实验还测量了不同激光功率、不同辐照时间下探测器继续升温的时间,结果表明继续升温时间随辐照时间的加长而减小,随激光功率的提高而增大.     

中长波红外探测器非线性度分析

线性度作为评价探测器性能参数的一个重要指标,直接影响着用户的使用状况。以中长波两个波段的探测器作为实验器件,分析讨论了以全波段黑体辐照功率与像元响应率线性拟合及以波段辐照功率与输出信号电压进行线性拟合的两种不同的评价方案。全波段黑体辐照功率拟合出的线性度结果较差,非线性度在6 %左右,而采用波段辐照功率拟合出的非线性度均在0.5 %以内。最终确定以波段辐照功率拟合出的线性度有较高的准确性,为直观评价探测器性能的优劣提供了指导依据。     

激光对PV型Hg1-xCdxTe探测器的损伤效应

研究了较大功率激光辐照对PV型Hgl-xCdxTe探测器的损伤效应.测量了损伤前后探测器的饱和信号输出,得出了pn结退化造成其性能下降的结论.根据pn结的并联电阻模型解释了损伤后探测器对背景辐射的响应率下降现象以及损伤前后激光辐照下饱和开路电压几乎相等的现象.研究了其pn结退化造成的探测器响应率、探测率等性能参数的变化,以及由于Hg原子的逃逸和扩散给器件性能带来的影响.     

Technology innovation and process integrations for sub-100nm gate patterning

This paper presents a brief overview of the Applied Centura(R)DPS(R)system,configured with silicon etch DPS Ⅱ chamber, with emphasis on discussing tuning capability for CD uniformity control. It also presents the studies of etch process chemistry and film integration impact for an overall successful gate patterning development. Discussions will focus on resolutions to key issues, such as CD uniformity, line-edge roughness, and multilayer film etching integration.     

White organic light-emitting devices based on fac tris（2- phenylpyridine） iridium sensitized 5,6,11,12-tetraphenylnap -hthacene

We have fabricated the white organic light-emitting devices （WOLEDs） based on 4,4＇ -bis（2,2 -diphenyl vinyl）-1,1＇ - biphenyl （DPVBi） and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene （rubrene）. The device structure is ITO/2T-NATA （20 nm）/NPBX （20 nm）/CBP： x%Ir（ppy）3：0.5% rubrene （8 nm）/NPBX （5 nm）/DPVBi （30 nm）/Alq（30 nm）/LiF（0.5 nm）/A1. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris （2-phenylpyridine） iridium [Ir（ppy）3], acts as a yellow light-emitting layer, and N,N＇ -bis- （1-naphthyl）- N,N＇ -diphenyl -1, 1＇ -biphenyl-4,4＇ -diamine （NPBX） acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir （PPY）3 is 6wt%, the maximum luminance is 24960 cd/m^2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V.     

Complete approach to automatic identification and sub-pixel center location for ellipse feature

To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. In the method, the feature area is identified automatically based on the edge attribute, and the sub-pixel center location is accomplished with the leastsquare algorithm. It shows that the method is valid, practical, and has high precision by experiment. Meanwhile this method can meet the need of instrumentation of visual inspection because of easy realization and without man-machine interaction.     

小角度扩展相关性近似算法分析

本论文提出一种在多天线MIMO信道相关性建模中小角度扩展近似理论算法,并应用于分析MIMO系统性能。分析中分别对三种不同角能量分布情况下的空间相关性研发快速近似计算法,并同时提出双模(Bi-Modal)角能量分布情况下的近似运算。通过分析这些新方法的近似效率,可以得到计算简单、复杂度低、而且符合实际的MIMO相关信道矩阵,对系统级的快速高效计算法的研究和系统级的评估以及误差分析具有重要的意义。     

A Versatile Mixed-Signal Pin Approach for Cost-Effective Test of Automotive ICs

Integrated circuits (ICs) intended for increasingly sophisticated automotive applications bring unique test demands. Advanced ICs for applications such as highly integrated automatic braking system (ABS) and airbag controllers combine high voltage digital channels, significant VI demands and precise timing capability. Along with continued missioncritical reliability concerns, the trend toward higher voltage operation and increased device integration requires specialized test capabilities able to extend across the wide operating ranges found in automotive applications. Among these capabilities, automotive test requirements increasingly dictate a need for a cost-effective versatile mixed-signal pin electronics with very high data rates reaching up to 50MHz with a voltage swing of-2 V to +28 V.     

Optical vibration and deviation measurement of rotating machine parts

It is of interest to get appropriate information about the dynamic behaviour of rotating machinery parts in service. This paper presents an approach of optical vibration and deviation measurement of such parts. Essential of this method is an image derotator combined with a high speed camera or a laser doppler vibrometer （LDV）.     

INTEGRATION OF OPTICAL AND WIRELESS NETWORKS

正For a long time,optical and wireless systems/net-works are developed in separate communities witha few attempts for in-depth convergence.In fact,it prom-ises many advantages to combine the optical and wire-less technologies in the levels of systems and networks.Recently,both academia and industry have made manyefforts to enter a new phase of development to take op-tical and wireless systems as fully integrated networks.To provide high bandwidth and reliable service for bothfixed and mobile users,a well-designed network must     

社长序言（英文）

正Happy New Year!As we step into a new year,we take a look back at the key feature topics covered in China Communications over the past 12 months and set out our expecta-     

云计算专题（英文）

正Cloud computing is a novel computing paradigm that utilizes remote cloud resources to achieve a high-performance computation.Cloud provides infrastructure,platform and software as different on-demand services.China has made remarkable progress in cloudbased products and operating system technology.The government,enterprises and research institutions are all active in the development of cloud computing-related projects.Despite the progress,many important problems     

Call for Papers—Feature Topic,Vol.12,No.3,2015

正Smart Grid Communications The electric power industry is undergoing profound changes as the industry aims to capture the promise of a smart grid for a sustainable energy future.Enabled by the advanced sensing devices such as Phasor Measurement Units(PMUs),increasingly powerful