共查询到19条相似文献,搜索用时 93 毫秒
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空间遥感器两维扫描指向镜的轻量化设计及应用 总被引:1,自引:0,他引:1
论述了空间遥感器中两维扫描指向镜的轻量化设计应注意的主要问题,并给出了扫描指向镜的轻量化设计的应用实例,利用有限元软件,结合设计指标,对其进行了光、机、热综合分析. 相似文献
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几种双面对准原理的分析与比较 总被引:3,自引:0,他引:3
高仰月 《电子工业专用设备》2000,29(4):35-38
根据国内外双面对准曝光机中双面对准曝光技术及工艺的发展 ,系统地对目前国内外典型的几种双面对准原理进行了比较与分析。 相似文献
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Rattier M. Benisty H. Smith C.J.M. Bernaud A. Cassagne D. Jouanin C. Krauss T.F. Weisbuch C. 《Quantum Electronics, IEEE Journal of》2001,37(2):237-243
As a step toward the use of photonic crystals in optoelectronic devices, we present a thorough study of 2-D photonic-crystal mirrors etched into a GaAs-AlGaAs planar waveguide. Fabry-Perot resonators are fabricated to deduce the reflectivity, transmission, losses, as well as the penetration lengths of these mirrors. The guided photoluminescence of InAs quantum dots embedded in GaAs is used to obtain the transmission spectra of these cavities. The varying thickness between the mirrors allows a scan across the whole bandgap spectral range. Quality factors (up to 200) and peak transmissions (up to 0.3) are measured showing that mirrors of four rows of holes have 88% reflectivity, 6% transmission and 6% losses. Losses are also related to a two-dimensional transfer matrix method calculation including a recently introduced scheme to account for losses 相似文献
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用于高能激光系统的高速扫描转镜 总被引:1,自引:0,他引:1
介绍两种用于大能量激光系统中的扫描转镜,这两种转镜都用空气透平驱动.一种是用空气静压轴承支承;另一种是无芯轴地支承在三托轮中.本文叙述了转镜的设计、制作和实验结果. 相似文献
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A two-grid polarization rapid scan interferometer for the measurement of Electron Cyclotron Emission from the LT-4 Tokamak is described. The instrument incorporates two scanning mirrors, and a back e.m.f. derived mirror position monitor 相似文献
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大口径主反射镜的轻量化方案设计 总被引:1,自引:0,他引:1
随着空间探测技术的不断发展,对光学系统中大口径主镜的需求越来越迫切。本文针对大口径主镜所面临的技术难题,通过有限元的方法研究了不同减轻方式对其结构稳定性的影响,并从中选出了最优方案,为今后的实际工程应用打下了坚实的基础。 相似文献
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Toland B. Barlevy A.S. Hughes W.M. Johnson D.R. 《Antennas and Propagation, IEEE Transactions on》1997,45(6):982-988
A novel three-axis beam waveguide that has been developed for millimeter-wave satellite link applications is described. A breadboard model has been fabricated and RF measurements at 60 GHz have been performed. The breadboard model was equipped with adjustable mirrors and feeds to simulate component misalignments due to fabrication errors and the space environment. The effects of misalignments on system performance have been measured and results are reported and comparisons with theory are made 相似文献
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Chun-da Liao Jui-che Tsai 《Industrial Electronics, IEEE Transactions on》2009,56(4):1057-1065
Due to the advancement of microoptoelectromechanical systems and microelectromechanical systems (MEMS) technologies, novel display architectures have emerged. One of the most successful and well-known examples is the Digital Micromirror Device from Texas Instruments, a 2-D array of bistable MEMS mirrors, which function as spatial light modulators for the projection display. This concept of employing an array of modulators is also seen in the grating light valve and the interferometric modulator display, where the modulation mechanism is based on optical diffraction and interference, respectively. Along with this trend comes the laser scanning display, which requires a single scanning device with a large scan angle and a high scan frequency. A special example in this category is the retinal scanning display, which is a head-up wearable module that laser-scans the image directly onto the retina. MEMS technologies are also found in other display-related research, such as stereoscopic (3-D) displays and plastic thin-film displays. 相似文献
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Jian Zhang Sei-ichiro Kamata 《Journal of Visual Communication and Image Representation》2012,23(3):418-425
The Hilbert curve is a one-to-one mapping between multidimensional space and one-dimensional (1-D) space. Due to the advantage of preserving high correlation of multidimensional points, it receives much attention in many areas. Especially in image processing, Hilbert curve is studied actively as a scan technique (Hilbert scan). Currently there have been several Hilbert scan algorithms, but they usually have strict implementation conditions. For example, they use recursive functions to generate scans, which makes the algorithms complex and difficult to implement in real-time systems. Moreover the length of each side in a scanned region should be same and equal to the power of two, which limits the application of Hilbert scan greatly. In this paper, to remove the constraints and improve the Hilbert scan for a general application, an effective generalized three-dimensional (3-D) Hilbert scan algorithm is proposed. The proposed algorithm uses two simple look-up tables instead of recursive functions to generate a scan, which greatly reduces the computational complexity and saves storage memory. Furthermore, the experimental results show that the proposed generalized Hilbert scan can also take advantage of the high correlation between neighboring lattice points in an arbitrarily-sized cuboid region, and give competitive performance in comparison with some common scan techniques. 相似文献