共查询到20条相似文献,搜索用时 109 毫秒
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全息彩虹字要能达到实用化,必须满足大视角、大面积,制作方便、再现容易的要求。通过研究,本文报导一种简单有效的制作方法,用满足一定要求的两个双光束干涉光路来拍摄,对实心字和空心字分别进行两次曝光,并用线光源在一定条件下进行再现。 相似文献
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全息术是一种用相干光干涉得到物体全部信息的2步成像技术。全息术的发展大约可分同轴全息术、离轴全息术、白光再现全息术、白光全息术等4个阶段。全息术具有三维、不可撕毁、再现像的缩放、信息容量大等特点。全息术是一门正在蓬勃发展的光学分支,近年来已渗透到社会生活的各个领域并被广泛地应用于近代科学研究和工业生产中,特别是在现代测试、生物工程、医学、艺术、商业、保安及现代存储技术等方面已显示出特殊的优势。随着全息技术的快速发展,全息技术的产品正越来越多地走向市场、应用于现代生活中。 相似文献
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全息印刷—21世纪的印刷术 总被引:1,自引:0,他引:1
从特种印刷的角度介绍了近几年才发展起来的新领域-模压全息。模压全息作为低成本、大批量重复复制全息图的一种工业化手段,已在安全印刷、产品促销、包装装璜等领域得到了广泛的应用,文章着重介绍了这一领域的发展概况,全息技术及其应用,工作原理与工艺技术及设备,未来发展前景等几个方面。 相似文献
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一种制作二维全息光栅图象的新方法 总被引:3,自引:0,他引:3
本文介绍了一种新的制作光栅图象的方法,它是利用全息光栅做为象素,由光栅的空间频率决定该象素的颜色,而由光栅的方向决定该象素被观察的范围或角度,并给出了实验中所使用的设计参数和实施方案。 相似文献
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彩色计算全息颜色匹配的研究 总被引:3,自引:2,他引:1
基于色度学原理,研究了彩色计算全息颜色的匹配问题,给出了电子显示色系下颜色量与计算全息物光波振幅之间的等色传递关系.首先,讨论了电子显示色系和彩色计算全息色系之间的颜色传递问题,并且给出了这两个色系下颜色量的转换方法.其次,以彩色全息再现像与原始计算目标颜色一致为目的,分析了彩色计算全息色系下的颜色量和与其对应物光波振幅的关系,并得出了颜色量和物光波振幅间应满足的一般方程.最后,本文选取PAL制式彩色显示色系下的彩色目标为全息图计算物体进行了彩色全息显示实验,结果表明本文所述彩色计算全息颜色匹配方法是有效的.本文的研究工作将为彩色计算全息显示的实用化奠定一定的理论基础和技术依据. 相似文献
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数字全息中的一些基本问题分析 总被引:27,自引:2,他引:25
利用全息理论、傅里叶频谱分析和采样定理,在模拟和数字全息光栅实验基础上,分析了数字全息记录和再现中的一些基本问题。结果表明:在物体和CCD尺寸确定的情况下,记录光路结构参量只取决于对图像采样的要求及CCD的像素尺寸,只要物体到CCD的距离满足采样要求,数字全息图再现光场的三个部分就可以分离;用准直平行光作为记录参考光和模拟再现光,可以得到与物体大小和形状完全一致的再现像;采样条件对再现像的影响大于分离条件,减小参物光的夹角记录适当过采样的数字全息图,有利于提高再现像的质量;另外,在获得高质量再现像方面,根据物体的具体特征,尽可能记录高质量的数字全息图,与满足采样条件和分离条件具有同样重要的意义。 相似文献
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V.G. Kulkarni 《Optics Communications》1981,39(3):132-136
Two simple holographic multiplexing techniques for sequential hologram interferometry of a diffusely illuminated object are described. These techniques enable one to use the frozen-fringe hologram interferometry to study a quasi-continuous change in the object and so regain some of the advantages of real-time hologram interferometry. In the first method of multiplexing with a single reference beam, a small angle prism is used for varying the direction of the reference beam between successive exposures and a double-exposure hologram is recorded at each position of the prism. In the second method of multiplexing with multiple reference beams, a separate reference beam is used for recording each state of the object independently and the interference pattern between any two states is obtained by simultaneous reconstruction of two light fields. The advantage of this method over the previous one is that it is also suitable for dynamic studies. Some reconstructed interferograms of a diffusely illuminated transparent object under different stresses are presented as illustrations. 相似文献
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Ding Wang 《Optics Communications》2006,267(1):79-82
A true color stereoscopic hologram is made with one-wavelength laser. Under illuminating incandescent lamp, a true color stereoscopic image can be seen from the hologram. A diffused reference light and a project object light are used in the recording of the hologram. The three primary color images of natural scenery are encoded on a white-and-black film. With the help of the encoded film, a true color hologram is recorded on a plate by single exposure and a true color stereoscopic by two exposures. The simplification of this method is apparent. Further more, it largely decreases the scattering noise of the hologram and averts the problem of color lack fidelity of the holographic image. 相似文献
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Results of experiments on recording three-dimensional holographic images of extended diffuse objects using an SHG hologram generating the second harmonic are presented. In this case, the object image is formed by the second-harmonic radiation whose wavelength is smaller than the wavelength of object and reference waves recorded on a hologram by a factor of two. Elements of the theory of an SHG hologram are considered. A holographic image of a transparency object illuminated with diffuse light is obtained. It is shown that the resolving power of this image is close to the limit determined by diffraction effects. An experiment on defocusing the reconstructed image showed that it was localized in one spatial plane and, therefore, was three-dimensional. 相似文献
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We describe and demonstrate a volume holographic storage system in which a phase-conjugate object beam is reconstructed by the same reference beam that was used for recording. An intermediate hologram is used as a temporary buffer, recorded with its own reference beam and the data-bearing object beam. Reading this buffer hologram with the phase conjugate of its reference beam reconstructs the phase conjugate of the object beam, which can then be recorded into the desired volume hologram for long-term storage. This method combines the immunity to lens aberrations provided by phase-conjugate readout with the simplicity of using the same multiplexed reference beam for both recording and readout. Only a single pair of phase-conjugate reference beams is required. Experimental results are shown with a single LiNbO(3):Fe crystal used as both buffer and storage holograms and a self-pumped phase-conjugate mirror in BaTiO(3) that provides the pair of phase-conjugate reference beams. 相似文献
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Normally when forming a TIR hologram two interference gratings are stored in the recording medium. The object beam interferes with the incoming and with the reflected reference beam. An appropriate selection of the polarization orientations of the interfering light beams leads to the suppression of one of the grating systems. Even to reconstruct TIR hologram it is not all the same in which orientation the reconstructing laser beam is polarized. With the proper selection of the polarization orientations of the forming and reconstructing laser light the diffraction efficiency for TIR holograms can be optimized. 相似文献
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本文提出一种可以分别再现双脉冲曝光粒子场全息图的两幅图像的技术,记录全息图时,利用电光晶体和偏振分光棱镜,使两个光脉冲的物光波或参考光波沿不同的空间路径到达全息底板,从而通过不同的空间滤波在再现全息图时分别获得对应于不同脉冲时刻的粒子场图像.实验证实了该技术的可行性. 相似文献
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