共查询到20条相似文献,搜索用时 62 毫秒
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构造了三区振幅型和相位型滤波器,用矢量衍射理论分析了两种滤波器对固体浸没透镜显微系统透射场的优化作用.从光斑大小、聚焦强度(Strehl比)和边瓣强度等方面比较了两种滤波器的超分辨特性.数值结果指出,振幅型滤波器具有边瓣强度小,边界参数容限大的优点.相位型滤波器的超分辨效果比振幅滤波器的好,它的聚焦强度比振幅型的大.但是它的边瓣强度比振幅型的大. 相似文献
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在宽带/窄带兼容的数字接收机中,匹配滤波器一般需要前置级联积分梳状(CIC)滤波器。在高性能要求的系统中,还需要对CIC进行补偿。传统的方法是将CIC补偿滤波器和匹配滤波器分开设计,而本文提出了一种将两者合并,使用一个滤波器来实现两种功能的方法。在不增加滤波器阶数的情况下,这种方法可以得到更好的滤波器性能,同时又节约了硬件资源。 相似文献
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对于光学相关识别畸变问题常用到的两种综合鉴别函数,即等相关峰综合鉴别函数(ECPSDF)和最小平均相关能量综合鉴别函数(MACESDF)进行了原理论述,并利用振幅补偿编码方法制作匹配滤波器.为了比较两种综合鉴别函数的识别效果,在光学匹配滤波相关器上进行了实验.实验结果表明,ECPSDF的平均峰值以及平均峰值尖锐度要优于MACESDP,但其波动性较差. 相似文献
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针对传统的二元纯位相匹配滤波器进行光电混合景象匹配时存在信息丢失量大、识别困难的问题,提出了三值振幅-位相匹配滤波器算法.对红外景象匹配过程进行了计算机仿真实验,并与BPOF和ACMF匹配算法的相关结果进行对比.实验表明,三值振幅-位相匹配滤波算法提高了相关面的信噪比、相关峰锐度,增强了系统的抗噪声能力,进而有效地提高了景象匹配概率. 相似文献
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红外景象匹配是自动目标识别领域的一个重要方向,如何在复杂的天气条件下提高红外景象匹配概率是研究的难点.在研究不同天气条件下的红外成像和传统匹配滤波器性能的基础上,提出了三值振幅-位相匹配滤波算法(TAPF),该算法结合了二值振幅信息与二值相位信息进行编码.对比灰度相关、二元纯位相匹配滤波和三值振幅-位相匹配滤波三种相关算法在不同天气下的结果,实验表明,提出的TAPF算法在相关面上的相关峰特性参数均优于其他两种算法,对恶劣的天气条件具有较强的适应性,是一种有效的红外景象匹配滤波算法. 相似文献
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主要介绍了一种基于二元振幅补偿滤波的优化综合鉴别函数算法。这种算法制作的综合鉴别滤波器既有二元振幅补偿滤波相关峰值高、相关峰尖锐的特点,又降低了对输入图像的噪声敏感度,而且能识别旋转图像。计算机模拟结果表明,它在信噪比、Horner效率、相关峰尖锐度和鉴别能力等性能上都有一定提高。 相似文献
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根据UNPOF算法和ECPSDF算法的特性分析,综合得出了基于上述两种算法的复合匹配滤波器算法.模拟和试验结果表明该算法能实现UNPOF和ECPSDF算法的相互补偿,进一步改善匹配滤波器畸变容限. 相似文献
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Michael Reilly 《半导体技术》2004,29(12)
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. 相似文献
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Thomas M.Trexler 《半导体技术》2004,29(5)
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. 相似文献
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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. 相似文献
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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. 相似文献
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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. 相似文献
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Qi-jiang Ran Pei-de Han Yu-jun Quan Li-peng Gao Fan-ping Zeng Chun-hua Zhao 《光电子快报》2008,4(4):239-242
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. 相似文献
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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. 相似文献
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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. 相似文献
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《中国通信》2014,(7)
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 相似文献
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《中国通信》2014,(8)
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 相似文献