玻璃光盘基片

本文对制备光盘的各种材料的性能做了比较,叙述了采用白冕平板玻璃研制直径为133.35mm可擦除光盘基片的工艺过程,以及产品达到的性能指标。     

制作光盘和光纤的塑料及其发展动向

简要叙述光盘的结构原理、分类、光盘材料及其特性,并指出了材料的发展动向。对光纤的材料、塑料光纤的制备方法和特点以及发展方向与技术关键亦作了简要介绍。     

一种简便的光盘光栅常量测定方法

把光盘作为反射光栅，讨论了测量光栅常量的原理，并用激光器和刻度尺测量了光盘的光栅常量．     

光盘上的折射 衍射 偏振实验

介绍了在光盘上完成光的折射、衍射、偏振实验的方法.测量了光盘基板折射率、光道间距等数据,比较了空白和非空白光盘对于偏振实验的影响.     

光盘信息符散斑图的统计特性研究

提出了一种用激光散斑测量光盘信息符统计特性的方法.利用散斑统计理论中衍射散斑场的平均对比度与散射屏表面粗糙度近似成线性关系,把光盘等效为弱散射屏,对未刻录、刻录及存在缺陷的CD-R光盘不同区域形成的衍射散斑图进行了对比研究.实验结果表明,该方法具有可量化、全场测量的优点,能够表征光盘信息符的某些统计特性,这为测量光盘刻录质量提供了一种新的方法和途径.     

新一代高密度数字多用光盘(HD-DVD)研究进展

文章综述了新一代高密度数字多用光盘的研究进展，介绍了多种新型蓝绿光高密度可录和可擦重写光盘存储材料，讨论了高密度数字多用光盘所面临的问题以及其解决方法，最后提出了中国超高密度光盘存储技术发展的研究思路。     

GeSbTe直接重写相变光盘动态写擦特性研究

ＧｅＳｂＴｅ体系是目前最适用于可重写相变光盘记录的材料，本文利用自己研制成功的相变光盘动态测试装置对本所研制的ＧｅＳｂＴｅ相变光盘进行了光盘动态写实验和材料性能研究，并实现了直接重写，取得了较大的进展。实验中发现脉冲擦除比直流擦除有较好的擦除效果和较多的重写次数。     

原子力显微镜与表面形貌观察

简要介绍原子力显微镜观察材料表面形貌的原理。运用原子力显微镜,观察CD,VCD,DVD和可擦写的VCD光盘的刻录划痕,分析各类光盘的刻录特征,指出原子力显微镜在观察材料表面微米至纳米尺度形貌是非常有效的。     

磁光盘反射率测试方法研究

磁光盘反射率是一个重要的参数，在磁光盘的研制和生产过程中必须进行测试。本文首先介绍了反射率测试的典型方法，然后结合磁光盘磁光特性伺服测试系统提出了一种测试磁光盘反射率的实用有效的方法，使磁光盘磁光特性测试仪既能测试克尔角又能测试反射率。最后对该方法测试反射率的误差进行了评估，并给出了测试实例。     

光盘盘基应力双折射的研究

从理论和实验讨论了光盘盘基在不同入射角江束通过时所产生的相位延迟值的改变。用起偏器－调制器－补偿器－样品－检偏器结构形式的偏振相位调制方法对玻璃和聚碳酸酯两种材料光盘盘基进行测量，结果表明聚碳酸酯盘基的双折射远大于玻璃盘基的双折射。     

颗粒介质中声衰减的浓悬浮粒子理论及其应用

本文扼要介绍了作者建立的颗粒介质中的浓悬浮粒子理论,并将数值计算与已发表的有关实验比较,得到了满意的一致性。关于海洋沉积物的声衰减系数与频率的关系,因为不同的作者在不同的频段得到不同的关系,即高频段(几千赫以上)近似为线性关系,低频段(1千赫以下)高于一次方关系,曾产生长时期的争执,而根据本文的理论,这一争执可以得到统一。本文对颗粒参数的声学测量进行了探索,强烈地认为,除了测量颗粒介质的平均粒径之外,还要测量其第二粒径参数(如方差)才能完整描写颗粒介质的性质。本文可以作为新型颗粒参数测量仪的理论基础 关键词：     

薄片激光介质分区域主动冷却方法

针对高功率、大口径薄片激光器,提出了采用半导体制冷片阵列对薄片激光介质进行分区域主动冷却的方法,通过调节各单元半导体制冷片的工作电压,改变阵列的冷却效率分布,实现了对薄片激光介质的局部温度的控制,进而使得薄片介质的横向温度分布均匀,降低了热效应的影响,为薄片激光器的冷却设计提供了新思路,并通过实验验证了该方法的可行性。     

日间恒星实时探测的视频图像处理

为了解决船载光学测量设备日间测星数量偏少的问题,研究了暗小目标电视探测技术,以保证惯导系统全天时不间断航向校准。在视频图像处理中,采用中值滤波方法提高信噪比,同时采用基于模糊理论的最大模糊熵阈值分割方法自行构建隶属度函数,自适应求取阈值,实现了星体目标检测与识别。实验结果表明：在原光学设备光学系统不变的情况下,日间可探测的恒星由大于等于3.0星等、小于等于5颗,提高到了大于等于4.5星等,大于等于250颗,满足了惯导系统全天时不间断航向校准的要求。该成果可以推广应用于电视弱小目标探测领域。     

基于ARM9的激光烟雾透过率测量系统

分析了烟雾透过率的测量方法，并根据此方法提出了基于ARM9的激光烟雾透过率远程测量系统的原理及结构，详细介绍了系统硬件和软件设计。经实验检测，该系统可实时显示激光通过烟箱前后的光强对应的电压曲线，经少量计算即可得到烟雾透过率，满足工作人员在浏览器端远程控制系统运行及测量烟雾透过率。     

基于Polytec激光测振仪的光存储设备振动测试分析系统

针对光存储设备振动频率高的特点,采用Polytec激光测振仪拾取振动信号,并给出了基于Polytec激光测振仪的光存储设备振动测试分析系统。可用于硬盘盘片、磁头滑块、折臂组件、光盘盘片等振动测试,为光存储设备动态特性的测试和分析建立了良好的实验基础。     

Micromagnetic study of effect of tip-coating microstructure on the resolution of magnetic force microscopy

The properties of a magnetic force microscopy (MFM) tip are very important for high-resolution magnetic imaging. In this work, micromagnetic models of tips are set up to study the effect of tip-coating microstructure, especially the randomness of anisotropy on tip edge and tip end, on the resolution of MFM. The effective coating height and the resolution potential of tips with various microstructures and magnetic properties have been characterized by investigating the obtained signals from high-density continuous granular thin film disk media with a bit size of 8×16 nm² and bit-patterned media with a pattern period p of 50 nm. The magnetic moment distribution at the tip end should be perpendicular to the sample to realize a ‘magnetically sharp’ tip, which explains further the improved resolution in the recent experimental reports. Tips with well-controlled grain structure and magnetic anisotropy of coating materials can be applied to both high-density thin film disk media and bit-patterned media.     

Digital image processing for evaluating the characteristics of the microstructure of a holographic plate

A system of evaluating the microstructure of a holographic plate (for example; a light sensitive plate in dichromated gelatin (DCG) or photoresist emulsion) with economical measuring equipment is described. We observe the holographic plate with a microscope and CCD camera with a PC 586 computer. With the information from grey levels of the scanning image we obtain four film quality characteristics. We can scan the full size of the plate to obtain the macro-pattern. We can also select other magnifications of the local pattern. The apparatus has particular use in the detection of micro-particles of a microstructure.     

Towards fly- and lubricant-contact recording

Reducing the spacing between the magnetic head and the magnetic media is of crucial importance in enabling future high-density magnetic data storage. The magnetic spacing has been reduced to a level that we have to explore new schemes for the further reduction of the spacing. This paper reports authors’ efforts towards fly- and lubricant-contact recording scheme. The targeted objective is to minimize the mean-plane spacing between the slider and disk surfaces and to allow the further reduction of the overcoat thickness. The slider will still fly over the disk surface. The read/write head part of the slider will be protruded to contact lubricant—to minimize the mean-plane mechanical spacing. The key factors for achieving such a mechanism include super-smooth slider and disk surfaces, advanced slider air-bearing design to significantly reduce flying height modulation caused by disk waviness and flatness, nano-actuator design, position feedback control scheme to control the contact depth, and so on. The preliminary experimental data confirm the feasibility of such a lubricant-contact scheme. The slider air-bearing design presented in this work also indicates the feasibility of high-performance slider design, which can well follow the disk waviness. A parameter, anti-modulation factor, is introduced for the evaluation of slider's performance in reducing flying height modulation caused by disk waviness.     

Using diffractograms to evaluate optical systems with coherent illumination

A new approach to measuring aberrations of an optical system with coherent illumination is introduced. The optical system is evaluated by use of a so-called weak phase object and by digital image recording and processing. Based on the contrast transfer function theory for coherent systems, the main aberrations of the optical system can be determined. This is a convenient approach to evaluating and measuring complex optical systems with numerous optical elements after assembly and can serve as a simple performance test of an optical instrument in the field.