共查询到20条相似文献,搜索用时 46 毫秒
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详细分析了光盘机定位系统的构成,给出了具体的参数指标和执行机构的测试特性曲线,对定位的跟踪(包括道跟踪和聚焦)伺服控制进行了详细的讨论,给出跟踪伺服系统的设计。另外,还讨论了数字伺服控制DSP实现的问题,给出了实现结果,使道跟踪误差在±0.07μm之内,小于要求的±0.1μm。 相似文献
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介绍了在光盘驱动器中,ZCAV,CAV和CLV的工作方式和特点,检测了符合ISO标准的磁光盘预格式信息和非标准的ZCAV方式工作的相变光盘预格式信息。 相似文献
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分析了检定光学经纬仪“一测回水平方向标准偏差”的误差来源,并确定了它的合成标准不确定度和扩展不确定度。 相似文献
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Yong-Gu Lee Kevin W. Lyons Thomas W. LeBrun 《Journal of research of the National Institute of Standards and Technology》2003,108(4):275-287
In this paper, virtual reality techniques are used to define an intuitive interface to a nanoscale manipulation device. This device utilizes optical methods to focus laser light to trap and reposition nano-to-microscopic particles. The underlying physics are simulated by the use of Lagrange mechanics. A unique control method for the manipulation of the particles is also provided. The user can naturally grab and steer the particles. Behind the scene, a complex computation is performed to find the new location of the potential field induced by the laser beam that would move the particles accordingly. Haptic feedback is used to constrain the steering motion within the physical capability of the potential field. 相似文献
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Carbon fibre reinforced ceramic matrix composites (CMC), originally developed for lightweight heat shields of spacecraft, are used for high performance brake discs in sports cars from different manufacturers. In contrast to the CMC materials for space applications, based on woven fabrics and costly manufacturing methods, these low cost friction materials are produced by liquid silicon infiltration of porous Carbon/Carbon (C/C) preforms, based on short fibre reinforced CFRP green bodies manufactured via warm press technique. In this work, different manufacturing methods for ventilated CMC brake discs are compared to each other, and the development of a new technology for the manufacture of single piece C/C‐SiC brake discs in net shape technique is presented. 相似文献
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The Optical Fiber Tip: An Inherently Light‐Coupled Microscopic Platform for Micro‐ and Nanotechnologies 下载免费PDF全文
Gorgi Kostovski Paul R. Stoddart Arnan Mitchell 《Advanced materials (Deerfield Beach, Fla.)》2014,26(23):3798-3820
The flat tip of an optical fiber is a unique and unconventional platform for micro and nanotechnologies. The small cross‐section and large aspect ratio of the fiber provide an inherently light‐coupled substrate that is uniquely suited to remote, in vivo and in situ applications. However, these same characteristics challenge established fabrication technologies, which are best suited to large planar substrates. This review presents a broad overview of strategies for patterning the flat tip of an optical fiber. Techniques discussed include self‐assembly, numerous lithographies, through‐fiber patterning, hybrid techniques, and strategies for mass manufacture, while the diverse applications are discussed in context throughout. 相似文献
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和电信号的引出不同,光信号的引出存在着分路器的分光比损耗太大、引出光信号太弱、与引出光信号的位置有关等问题,使得在光通讯工程实际测试过程中,经常不稳定或不能满足测试需求而失败。本文提出了一种全光有源分路方法,充分发挥了光放大器的作用,可用于光通讯测试时光信号的引出。除了满足测试信号对原信号没有影响的基本要求之外,并且具有插入损耗小、引出信号强、成本较低和与测试光信号格式无关等特点。 相似文献
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相移干涉显微镜的研制和光盘预刻槽形的测量 总被引:6,自引:0,他引:6
作对原有的Mirau型相移干涉显微镜的干涉仪布局、参考板结构和位相探测技术中的有关算法作了改进,从而成功地将其运用于光盘预刻槽形的测量。中对新采用的光路布局、参考板制作方法、干涉图预处理技术以及光强轮廓线定位法都作了详细论述,并给出了光盘槽刻槽形的测量结果。 相似文献
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针对干涉型光纤传感器信号传感的原理特点,本文提出了一种光正交外差解调技术.该方法使用可调光纤延时线进行传感光信号延迟的精确调整以实现正交外差解调,从而减少了光电探测器的低频噪声影响.与常规的外差解调技术相比,提出的解调结构方案消除了电子移相元件所带来的额外电子噪声与环境温度变换引起的相位漂移.通过压电陶瓷环谐振特性测量实验,表明了提出的基于光正交外差的干涉型光纤传感器解调技术可以有效地进行干涉振动信号的解调,实验取得的最小可探测相移量可达到9.2× 10-5 rad. 相似文献
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简述研制磁光盘机械特性测试仪的必要性,介绍径向测试可供选择的几种方案,并进一步提出光栅定标过道信号的测试方法。 相似文献