Abstract:Two gradient-based optimization schemes were investigated for continuous wave near infrared optical tomography. The reason of slow convergence rate and low spatial resolution for conventional optimization schemes was analyzed. A spatial location weighted gradient-based optimization scheme was adopted to reduce the computation burden and increase the reconstruction precision. The reconstruction results confirm that the spatial location weighted optimization method offers a more efficient approach to the continuous wave optical imaging problem than conventional methods.

Abstract:An image fusion method was proposed based on the filter banks for merging a high-resolution panchromatic image with a low-resolution multispectral image. The panchromatic image was first decomposed into sub-images by using analysis filters and then the low-frequency sub-image of the panchromatic image was directly substituted by the multispectral image to merge a high-resolution panchromatic image with a low-resolution multispectral image. Finally, the fused image was reconstructed by using the synthesis filters. Experimental results indicate that the proposed approach can obtain the better trade-off between the spectral information of low- resolution multispectral sensor and the spatial properties of high-resolution panchromatic sensor by adjusting the channel number.

Abstract:Laser echo array detection technology has the characteristics of high speed and low-power-consumption, which has been paid more and more attention. Arraying the single component and array component are the main applied technology. The method to choose the parameters of such system was introduced. A prototype system was designed. And some important questions about such application were discussed.

Abstract:研究了1MeV电子辐照对中波碲镉汞光导器件的影响．通过测试辐照前后光导器件的室温和低温体电阻、响应光谱、电流响应率和探测率等性能参数，结果发现经过电子辐照，器件的峰值和截止波长在辐照后向短波方向移动．在辐照剂量大于10^15／cm^2时，器件的室温电阻和响应率明显下降．探测率由于噪声的影响无明显变化趋势．

Abstract:Crystalline ZnO nano-particles were synthesized on Si substrate with and without Au catalyst through chemical vapor deposition(CVD) method with ZnS as the source material for the first time. The growth morphology of ZnO particles is strongly affected by the flow rate, the temperature of the Si substrate and the catalyst. Without Au catalyst, the nano-particles are round in shape with the average sizes in the range of 30-200nm and the density of 10 4-10 9cm -2. In the presence of Au catalyst, ZnO particles grow into hexagonal shape. The average particle sizes are smaller, in the range of 10-100nm, while the particle density becomes larger, in the order of 10 8-10 10cm -2, than those of the ZnO particles grown without Au. Strong and relatively weak photoluminescence peaks around 497nm and 376nm are found for the as-synthesized ZnO nano-particles.

Abstract:采用磁控溅射方法在石英玻璃上制备了PbZrxTi1-xO3(PZT)(x=0．52)非晶薄膜，并测量了200～1100nm的紫外．可见．近红外透射光谱．基于薄膜的结构和多层结构的透射关系，发展了仅有6个拟合参数的光学常数计算模型．利用该模型，可以同时获得薄膜在宽波段范围内的光学常数和厚度，得到折射率的最大值为2．68，消光系数的最大值为0．562，拟合薄膜厚度为318．1nm．根据Tauc′s法则，得到PZT非晶薄膜的直接禁带宽度为3．75eV．最后，利用单电子振荡模型成功地解释了薄膜的折射率色散关系．

Abstract:阐述了利用Rugate膜系理论设计宽角度减反射薄膜的方法，从理论上分析了在宽角度的情况下，偏振产生透过率不同的原因，模拟设计了光谱区在1500-1600nm波段，入射角从0度到80度宽角度减反射薄膜，探索出了一条新型膜系设计的途径，其优化结果是较为理想的．这一研究方法如能在太阳能、光纤通信、航天、激光等领域应用，将大大地提高光能的利用率，具有重要的应用价值．

Abstract:The original image was properly divided into unoverlapped blocks according to the small change of texture in local areas of the remote senses image, each of which associated with a uniform texture. Then texture feature of each block was formed by calculating the mean and variance of Gabor filtered image. Rotation normalization was realized by circular shift of the feature elements to get the invariant texture feature vector. The classification of image blocks was also completed by using a simple unsupervised clustering algorithm. The experiments of the real images show that the method is effective.

Abstract:首次报道了集成中波 1/中波 2 (MW1/MW2 )的HgCdTe红外双色探测器的材料生长、器件制备及其性能 .采用分子束外延 (MBE)技术 ,生长了p p P N型Hg1-xCdxTe多层异质结材料 .通过B+ 注入、台面腐蚀、爬坡金属化、台面侧向钝化及互连等工艺 ,得到了 80元的原理型HgCdTe红外双色探测器 .纵向上背靠背的 2个光电二极管分别有电极输出 ,确保了空间上同步和时间上同时的探测 ,并能独立地选择最佳工作偏压 .它适于常规的背照射工作方式 ,且有大的空间填充因子 .在液氮温度下 ,2个波段的光电二极管截止波长λc 分别为 3.0 4 μm和 5 .74 μm ,对应的R0 A值为 3.85× 10 5Ωcm2 和 3.0 2× 10 2 Ωcm2 .测得MW1、MW2的峰值探测率Dλp 分别为 1.5 7× 10 11cmHz1/2 /W和 5 .6 3×10 10 cmHz1/2 /W .得到 2个波段的光谱响应 ,且MW2光电二极管的光谱串音为 0 .4 6 % ,MW1光电二极管的光谱串音为 6 .34% .

Abstract:Several important factors, including Gaussian blurring,finite imaging region, and discrete computation, were considered to study the stability of moment invariants in practical application. The effect and rules of each factor to the moment invariants were investigated. The stability of moment invariant on the discrete data case was analyzed. The experiments show that it is possible to recognize the blurred and rotated images accurately by the suggested invariants. All these researches will provide important theoretical and experimental foundations for practical imaging recognition systems.

Abstract:对在SiC衬底上采用MOCVD方法制备的GaN和GaN：Mg薄膜进行X射线衍射(XRD)、扫描电镜(SEM)和拉曼散射光谱的对比研究发现：两种样品均处于张力作用之下，但是GaN：Mg样品却由于Mg的掺杂会在样品中引入更多的缺陷和位错加剧薄膜的无序化程度，致使薄膜质量变差；其次因为Mg原子半径比Ga原子半径大，所以当Mg替代Ga以后会引发压力应力，从而使薄膜张力减小，最后通过计算说明对于GaN：Mg样品而言，除了载流子以外，薄膜质量同样也会对A1(LO)模式产生影响．

Abstract:报道了光存储效应在一种特殊设计的光存储单元Ⅰ-Ⅴ特性上的响应．当单元偏置在光存储模式下，越过禁带的光激发会产生一个台阶状的电流阶跃．利用瞬态光电流测试装置测量电流阶跃处的瞬态响应，验证了“开→关”光电流下降沿主要反映了光照消失后原先被存储起来的电子、空穴的衰变过程．其时间常数是光存储时间的一种度量，而光照下所出现的台阶状电流阶跃则是光子存储效应在Ⅰ-Ⅴ特性的反映．

Abstract:An organizational coevolutionary classification algorithm was proposed for recognition based on 1-D images of radar targets. It is different from available EA-based techniques mainly in that its evolutionary operations are performed on the examples directly, but not on the rules. It uses a bottom-up search mechanism, that is, it makes groups of examples evolved, and then rules are extracted from these groups of examples at the end of evolution. This method can avoid generating meaningless rules during the evolutionary process. The proposed method needs not extract the features and reduces the dimensions for high dimensional data previously. It has not complicated computations, with high training and recognition speeds result. Experimental results on the data of 3 airplanes obtained in a microwave anechoic chamber show that the proposed method has a stable performance and outperforms the methods based on SVMs and wavelet kernels. Its predictive accuracy is higher than 96%. In addition, its ability in resisting the noise is also tested, and a good result is obtained.

Abstract:利用傅立叶变化红外(FT-IR)二维样本和波数相关光谱研究了水溶液中牛血清白蛋白(Bovine serum albumin)的热动力学过程．二维样本相关分析的结果给出了牛血清白蛋白随温度变化的趋势，表明牛血清白蛋白剧烈的结构变化开始于66℃；而二维波数相关分析提供了在升温过程中牛血清白蛋白结构上变化和各结构变化次序的细节．研究显示了二维相关光谱在蛋白质热变性分析中的重大作用．

Abstract:对梯度折射率半透明介质内辐射热平衡温度场进行了计算，考察了黑壁面及镜反射半透明界面时，线性和正弦两种不同折射率分布对温度分布的影响．当介质层边界为黑壁面，辐射能从光密介质向光疏介质传递时发生全反射导致某个热源在换热中的作用增大．当介质层具有镜反射半透明边界，除上述作用外，界面处的辐射换热也对介质内温度场产生影响．

Abstract:Based on the theory of electromagnetic field, the emissivity of 3mm coating stealth material was deduced.Then the radiometer antenna temperature of coating stealth material was modeled.This model proposes the quantitative relations among the antenna temperature, material thickness, material relative permittivity and material relative permeability. The results of numerical calculation agree well with the measured results. So this model is effective.

Abstract:制作了2种形式的铟凸点：即直接蒸发沉积的铟柱和将铟柱回流得到的铟球。同时对比了铟柱和铟球2种凸点的剪切强度，测试结果表明铟球剪切强度为5.6MPa，铟柱的剪切强度为1.9MPa，前者约为后者的2.9倍。对铟凸点微观结构的X光衍射分析发现：铟柱剪切强度低是织构弱化所致；铟球剪切强度高是由于回流破坏了铟柱的理想（101）丝织构模式，从而提高了铟球的剪切强度。

Abstract:A theoretical analysis of nonlinear optical absorption in thick nonlinear media was given by slicing a thick media into a stack of thin media. And the result is also suitable for the strongly nonlinear regime. The comprehensive analysis for near field case was given, It is very valuable for the design of optical limiters and analysis of Z-scan experiments.

Abstract:To segment targets under complicated background from infrared images of natural scenes, an infrared image segmentation algorithm based on mathematical morphology was presented. First, the noise and small interferential regions are removed with morphological filters. Second, a multiscale algorithm for computing morphological gradient images is proposed and the gradients are derived. Third, the images are segmented by improved watersheds and the problem of over-segmentation regions is settled well by an effective region merging method. The experiment results show that the approach performs well in target segmentation in infrared images.

Abstract:Image Super-resolution technique is the process of obtaining an image at a resolution higher than that afforded by the physical sensor. For optical images, a novel super-resolution method based on delaminating idea was proposed. To implement the new algorithm easily, an ally-template algorithm was suggested. Experiment results indicate the efficiency and feasibility of the novel method.