共查询到20条相似文献,搜索用时 93 毫秒
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DVD光学头的设计研究 总被引:3,自引:0,他引:3
可读取DVD与CD光盘的光学头的主要差别是数值孔径。本文在分析现有各方案的基础上,提出了一种利用TN液晶盒电子切换的DVD/CD双功能光学头设计方案。 相似文献
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遥感仪器的技术指标在很大程度上受光学遥感器焦面组件光机设计方案的影响。通过在实际中的设计应用,提出一种面向探测器属性的光机设计思路。该设计首先确定主要设计输入,并依此将探测器视为光学件、结构件、电子学件或者热控件,设计次级光机结构模块来满足相关要求,然后在此基础上展开成整个焦面光机设计方案。随后依据该思路,针对四种情况给出了实际样例并加以解析,指出四种方案的优缺点。该设计思路使得设计流程清晰化,可以为其他光学遥感器的焦面设计提供参考。 相似文献
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大气气溶胶光学厚度反演软件系统设计和实现 总被引:1,自引:0,他引:1
为了实现大气气溶胶光学厚度反演的要求,提出一种基于传统暗像元算法为基础的一体化软件系统设计方案,并完成系统的设计和气溶胶光学厚度反演实验。该系统的软件设计主要利用开源GDAL库对MODIS遥感数据进行提取和处理,并通过6S模型建立得出数据查算表。经过应用表明通过该软件系统使反演过程简单化、可视化,同时实现了气溶胶光学厚度反演的一体化的处理。 相似文献
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A new dual-polarized cryogenic Schottky barrier mixer receiver for radio astronomy applications is described. Between 85 and 120 GHz, the double sideband receiver temperature, including all contributions from the polarization diplexing system, telescope coupling optics and dewar window is less than 125°K in either channel. Novel features include a very broadband, fixed tuned mixer design and a compact, low-loss, linear polarization diplexing scheme. 相似文献
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Jahns J. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1994,82(11):1623-1631
Planar optics is an approach to build integrated free-space optical systems on single substrates. Computer-aided design, lithographic fabrication, and micro-bonding techniques are used to package the optics in a compact way. This paper reviews recent work on planar optics. It discusses various aspects of the fabrication, the design, and the application of planar optics as an interconnection technology for optoelectronic computing and switching systems 相似文献
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飞行光学导光系统中的光学理论和设计 总被引:1,自引:0,他引:1
从激光加工的角度出发,以多模激光光束传输和聚焦理论为基础,论述了飞行光学导光系统中光束变换系统的设计方法,光束质量对飞行光学导光系统的设计的影响,提出了飞行光学系统中激光光束在激光加工中的加工范围和有效焦深等新概念。 相似文献
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激光聚光系统中激光光学与几何光学设计参数间的差异研究 总被引:1,自引:1,他引:0
针对一结合激光光学理论设计的激光聚光系统,本文运用矩阵光学理论精确地计算了高斯光束经过该系统变换后的主要设计参数,并与几何光学的设计参数进行了比较。 相似文献
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Ping Liao ZhongHai Yang Tao Huang 《Journal of Infrared, Millimeter and Terahertz Waves》2003,24(11):1853-1860
The basic feature and design method of MMW TWTs electron optics are analyzed in this paper. With the increasing area convergence ratio of the electron gun in TWTs, the initial thermal velocity of electrons at cathode and the non-magnetic shielded effect can no longer be neglected. It brings new challenge for the design and simulation of MMW TWTs electron optics. A method of investigation the beam DC characteristics is described using particle-in-cell (PIC) simulation and incorporate electron beam optics model integrated electron gun with periodic permanent magnetic focusing system. It is valuable for achieving the goal of “first-pass design success” and the electron optics engineering design and optimization. 相似文献
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Jitendra Nath Roy Anup Kumar Maiti Debajyoti Samanta Sourangshu Mukhopadhyay 《Optical Switching and Networking》2007,4(3-4):231-237
In the field of optical interconnecting network the tree architecture has already taken the significant roles. Nonlinear optics has drawn a great interest in all-optical signal processing for its high speed photonic activity. Optical nonlinear materials (ONLM) may provide a major support to optical switching-based all-optical logic and algebraic operations. Here operational speed is extremely high (far above GHz). In this paper, an ONLM-based switching system is extensively used to design tree architecture for developing some arithmetic operational system in an all-optical domain. An alternative scheme of all-optical addition and subtraction and comparison of binary data is also proposed exploiting the above optical tree. 相似文献
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由于能够减小系统自身的热噪声和提高系统信噪比,低温光学是实现高灵敏度红外探测的必要手段。提出了一种将脉冲管制冷机用作冷源的透射式低温光学系统。这种新型低温光学系统可用于体积和重量受限而又需要进行高灵敏度红外探测的场合。从光学设计、光机结构设计和内部热噪声分析等方面说明了透射式低温光学系统的设计过程。搭建了用于对脉冲管制冷机冷却光学系统的可行性进行验证的试验系统,并从系统内部热噪声的角度对低温光学的有效性进行了验证。实验结果表明,经过3 h,透镜温度由300 K降至设计温度150 K,继续降温则可达到最低温度105 K。测试过程中,透镜保持完好,验证了将脉冲管制冷机用作冷源的可行性。用黑体和320×256元碲镉汞探测器对光学系统自身的热噪声进行了测试。结果表明,当光学系统的温度从300 K降至215 K时,其自身热辐射减少了75%。这与理论分析结果一致,验证了低温光学降噪的有效性。 相似文献
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Beam shaping technique for generating flattop beam has long been used in optics, and there are many methods to design flattop-beam shapers in optics. Flattop beam is also important in some applications at millimeter wavelengths such as in the quasi-optical power divider, however, there are few design method for the flattop-beam shaper used at millimeter wave frequencies and the design method of optics are not suitable to the beam shaper at millimeter wave frequencies, so a design method for the flattop-beam shaper at millimeter wave frequencies is presented in this paper. Several flattop-beam shapers in the form of diffractive element have been designed and simulation results are presented. 相似文献