专业英语期末翻译.docx

1、专业英语期末翻译光电专业英语期末翻译专业班级 学生姓名 学 号 二0一五年六月目录1. 文献翻译 11.1 英文原文 11.2 中文译文 21.3 文献附录 42. 科技论文摘要 83. 扩写摘要 91. 文献翻译1.1 英文原文Advantages of Holographic Laser Projection Low Speckle Contrast: One of the huge advantages of LBOs technology is the ability to substantially reduce laser speckle, a phenomenon that ma

2、kes the image “sparkle” due to scattering of coherent light from an optically rough projection surface and subsequent interference at the retina. The ability to reduce speckle is important because, not only do users find the artifact very unpleasant, it also severely impacts the perceived image qual

3、ity and effective resolution. Although there have been several demonstrations of speckle reduction in the literature, thus far only LBO has demonstrated the possibility for speckle reduction within the projection optics of a miniature laser projector. As has been shown previously, several methods ca

4、n be combined in the LBO projector in order to reduce speckle. The first results from the method of image generation and display used in the LBO system. Since N phase-independent sub-frames per video frame are shown within the eyes integration period, then the eye acts to add N independent speckle p

5、atterns on an intensity basis, and the contrast of the low-frequency components of the speckle in the field Vxy falls as N1/2. Evidently, some speckle reduction is inherent in LBOs multiple holograms per video frame approach to image display. Additional methods can be combined to further reduce the

6、speckle contrast because N cannot be increased indefinitely. Several methods have been demonstrated to remove speckle, but each require that the operation is performed multiple times per laser dwell period. This is straightforward in LBOs system because the laser modulation frequency is low and all

7、pixels are formed simultaneously. In addition, the intermediate image plane formed between L1 and L2 in Fig. 3 makes it simple to embed a speckle-reduction mechanism in the projector optics. The high laser modulation frequency and lack of an image plane make time-varying speckle reduction techniques

8、 difficult to implement in a scanned-beam system, as experts in the field have noted. These restrictions dictate that speckle in a scanned-beam projector can only be acceptably suppressed by using potentially costly custom diffusing screens, thereby limiting the utility of such systems in CE applica

9、tions.A demonstration of the efficacy of LBOs combined speckle reduction techniques is shown in Fig. 4; note that laser speckle is substantially reduced in the projected image, without significant loss of focal depth or resolution.High Brightness and Efficiency: It has previously been shown that, du

10、e to the phase-modulating approach to image formation, a holographic display can project significantly brighter images than imaging and scanned-beam systems when displaying video and photo content. In addition, because the image pixels are formed using an expanded beam which has an extremely wide pr

11、ojection angle, it is possible to make a holographic laser projection system much brighter than a scanned-beam display for the equivalent laser safety classification.The same combination of laser and phase-modulating hologram provides a highly power-efficient method of projection since, unlike imagi

12、ng displays, no light is blocked in the system. Furthermore, the phase-modulating nature of the microdisplay means that it is not necessary to continuously illuminate the microdisplay; the lasers are modulated in accordance with the frame brightness, thereby only utilizing the power required to illu

13、minate “on” pixels in the same way as a scanned-beam system. Although LBOs projection technology carries the overhead of hologram computation, the overall system efficiency is expected to be comparable to that of scanned-beam systems.This is principally due to the low frequency at which the lasers a

14、re modulated in LBOs system; since gray scale is formed by the hologram and because the phase-modulating microdisplay directs a fixed proportion of light onto the image, it is only necessary to modulate the laser sources with respect to average video-frame brightness.This necessitates a laser modula

15、tion frequency on the order of 1 kHz, allowing efficient digital modulation schemes to be used for each color. This is significantly more efficient than the method typically employed by scanned-beam projectors, where the pixel-by-pixel method of image formation requires the lasers to be switched at

16、high currents and frequencies of tens of MHz using complex and power-hungry circuitry. Furthermore, limitations in green-laser switching speed also necessitate that the laser is inefficiently analog modulated above and below threshold to render gray scale.1.2 中文译文全息激光投影的优点低散斑对比度：LBO技术的巨大优势之一是能够大大减少激

17、光散斑，一种由来自光学粗糙投影面的相干光的散射和随后在视网膜处的干涉而导致的图像闪烁现象。减少散斑的能力是很重要的，因为散斑不仅使得找到假象的用户感到非常不快，也严重影响了接收到的图像质量和有效分辨率。尽管在文献中已经有了几个的散斑抑制的实证，但是到目前为止只有LBO演示了在微型激光投影仪内投影光学系统的散斑抑制的可能性。上面已经提到，有几种方法可以结合LBO 投影仪用以减少散斑。首次结果来自用于LBO系统中图像生成和显示的方法。因为N个相独立子帧的每一视频帧在眼睛里的整合时期显示，然后眼睛行为在一个强度基础上添加 N个独立散斑模式，和散斑在Vxy 领域上降到N1/2 的低频成分对比。显然，一

18、些散斑抑制在LBO多重全息图的每一视频帧达到图像显示时是固有的。可以结合其他方法来进一步减小散斑对比度，因为N不能无限制地增加。有几种方法已证明可以消除散斑，但该操作需要在每个激光停留期间多次执行。这是直接的LBO系统，因为激光的调制频率较低，同时形成的所有像素。另外，如图3所示，中间像平面形成在L1 和 L2之间使得很容易在投影仪光学系统中嵌入一个散斑抑制机制。高的激光调制频率和像平面的缺乏使时变散斑抑制技术在光束扫描系统中很难得到执行，该领域的专家已经注意到这点。这些限制决定了散斑在扫描光束投影中只能通过使用可能代价很高的定制扩散屏幕，因此限制了这类系统在消费电子应用上的实用性。一个LBO

19、结合散斑抑制技术的效果实例如图4所示，注意，在投影的图像中激光散斑大大减少，焦深或分辨率并没有明显的损失。高亮度和功率：如之前所示，由于相位调制而实现图像形成，当显示视频和照片的内容时全息显示能投影出比成像和扫描光束系统明显更亮的图像。此外，因为图像像素是使用具有极其广阔的投影角的扩大光束束形成的，可能使全息激光投影系统比在相同激光安全等级下的扫描光束显示更亮。激光与相位调制全息图的相同结合提供了一个高功效投影的方法，因为，与影像显示不同，没有光在系统中会被阻塞。此外，微型显示器的相位调制性质意味着它没必要不断地照亮微型显示器；激光与帧的亮度调节到一致，从而用与扫描光束系统同样的方法仅使用照亮

20、“打开”像素的所需功率。LBO投影技术进行的全息图计算开销，整体系统效率预计将和扫描光束系统相媲美。这主要是由于低频率的激光在LBO的系统调制；由于灰度是因为相位调制显示器指示固定比例的光在图像形成的全息图，它对激光源的平均视频帧的亮度是必要的。这就需要对1千赫级激光的调制频率，允许高效的数字调制方案可用于每个颜色。图像形成的逐像素方法要求激光器，在高电流和频率数万MHz使用复杂和耗能电路，这是明显比扫描波束投射器，通常的方法效率更高。此外，在绿色激光开关速度限制也需要激光是低效模拟调制的上方和下方阈值来呈现灰度。1.3 文献附录2. 科技论文摘要全息投影技术的分类及应用XX（汉口学院，湖北

21、武汉 430212）摘 要：全息投影技术是目前较为热门并具有十分广阔应用前景的一种显示技术，本质上是通过在空气或者特殊的立体镜片上形成立体的影像。简述全息投影技术发展的历史阶段，现有的技术实现的三种方法，以及介绍现实生活广泛应用的实例，解释伪全息技术之所以受捧的原因，并分析三种方法的优劣及其发展前景。关键词：全息投影；分类；应用中图分类号： 文献标识码： 文章编号：Classification and Application of Holographic Projection TechnologyXX(Hankou University, Wuhan 430212, China)Abstrac

22、t: Holographic projection technology is one of the most popular and promising display technology, which is formed on the air or special three-dimensional lens. Describes the holographic projection technology development historical stage, existing technology to achieve the three methods, and introduc

23、ed the reality of life widely used examples to explain pseudo holographic technology by holding the reason, and analyzes the advantages and disadvantages of three kinds of methods and its development prospect.Key words: Holographic Projection; Classification; Application3. 扩写摘要全息投影技术是目前较为热门并具有十分广阔应用

24、前景的一种显示技术，本质上是通过在空气或者特殊的立体镜片上形成立体的影像。该技术不仅可以产生立体的空中影像，还可以使影像与表演者产生互动，一起完成表演，产生令人震撼的演出效果。而真正的全息投影技术目前都还处于试验阶段，因此现在大家看到的全息投影影像大部分都是通过3D投影屏幕实现的。全息投影技术无疑满足了人们对未来科幻世界的一切幻想，而这种幻想又将直接推动全息投影技术的发展，人们迫切地希望这种技术成熟的到来。通过阐述全息投影技术的基本原理，回顾其发展阶段，以及介绍全息投影在实际中的应用及其发展方向，从而更为全面地掌握关于全息投影技术的当前发展现状及新问题，并结合各种现有技术的特点，预测其潜在的研

25、究及应用。全息投影技术发展的四个阶段依次为同轴全息术、离轴全息术、白光再现全息术和白光全息术。目前主要有三种技术实现的方法，分别是空气投影和交互技术、激光束投射实体的3D影像和360度全息显示屏，通过分析比较这三种方法的优劣来预测其发展前景。虽然目前全息投影的技术还不成熟，但是它所散发出的魅力已经足以让很多行业蠢蠢欲动，在人们的工作、生活和娱乐等环境中，全息投影将无处不在，这项技术必将会对整个人类的文明历史产生深远的影响。Holographic projection technology is one of the most popular and widely used in the fut

26、ure. It is a kind of display technology, which is formed on the air or special stereoscopic lens. This technique not only can produce stereo aerial images, but also can make the image and the performers interact and complete the performance and produce a stunning performance. And the real holographi

27、c projection technology is still in the experimental stage, so now we see the holographic projection images are mostly achieved through the 3D projection screen. There is no doubt that the holographic projection technology to meet the people on the future world science fiction all the fantasies, and

28、 this kind of fantasy and will contribute directly to the holographic projection technology development, people urgently hope the arrival of the technology is mature. Through the elaboration of the basic principle of holographic projection technology, recalling its development stage, and introduce h

29、olographic projection in the practical application and development direction, and more comprehensive grasp of a holographic projection technology in the current development status and problems, and combined with the characteristics of a variety of existing techniques, its research and application po

30、tential prediction. The four stages of the holographic projection technology development in order to in-line holography, off-axis holography, white light reappearing holography and white light holography. At present, there are mainly three techniques to achieve, are air projection and interaction te

31、chniques, laser beam projected real 3D images and 360 degree holographic display screen, through the pros and cons of the analysis and comparison of these three methods to predict the prospect of its development in the future. Although the holographic projection technology is not mature, but it sends out the charm has been enough to let many industry ready, in peoples work, life and entertainment environment, holographic projection will be everywhere, to the whole of mankind civilization history of this technology will produce far-reaching effect.