共查询到19条相似文献,搜索用时 109 毫秒
1.
2.
3.
4.
5.
本文根据Namioka全息凹面光栅设计的几何理论,叙述了Seya—型单色器全息凹面光栅设计以及Ⅳ型消象差环面全息光栅设计,并建立了设计程序。经光线追迹计算表明,所得到的全息光栅单色器设计,确实提供了较为理想的象质。 相似文献
6.
7.
用全息透镜实现自参考光全息 总被引:1,自引:0,他引:1
一、引言自参考光全息术是利用物体表面散射光波的一部分形成物体的象,另一部分作为参考光记录象面全息图。这种象面全息图可以用扩展的白光照明再现。这种记录方式的优点是:①可以利用相干光程较短的激光记录,②物体有微小振动不影响参物光束的光程差;③记录高速运动的物体时,因物体运动产生的都卜勒频移没有影响。在文献[1,2]中,已报导了若干自参考光全息的记录光路。这些系统的共同点是利用普通透镜成象,其缺点是参考光弱,不能获得优质的全息图。在文献[2]中虽已提及用全息透镜实现自参考光全息,但它是用近轴全息透镜,参物夹角很小,再现象受照明光的影响。本文提出用离轴角较大的全息透镜记录自参考光象面全息图,克服了上述各种缺点,能获得最佳参、物光束比。这是由于近年来在全息干板处理方面发展了一些新的技术,可以获得所需要的衍射效率,这样用全息透镜实现自参考光全息,就可以根据不同的情况得到最佳的参、物光束比,得到高衍射效率的全息图。 相似文献
8.
9.
全息元件用于图像胶片的全息存贮 总被引:1,自引:0,他引:1
本文提出一种将存贮物镜和散斑随机相移器组合在一起的全息元件,可作为图像胶片一次微缩的高密度全息信息存贮的物体照明元件,并给出了实验结果。 相似文献
10.
11.
本文提出一种结构相当简单的大口径全息平面干涉仪,文中详细介绍了干涉仪的工作原理,并给出了实验结果。这种干涉仪特别适合光学车间使用。 相似文献
12.
二次曝光全息照相干涉仪及其在冲击波观测中的应用 总被引:1,自引:0,他引:1
本文简要阐述了全息照相术的原理及会聚冲击波的特点,在此基础上,设计了一种二次曝光全息照相干涉系统,使用该系统对圆柱形冲击波会聚过程的不稳定性进行了观测,得到了清晰的干涉图像,给出了几个重要结论。 相似文献
13.
14.
Yu. V. Khudyakov V. G. Atavin A. M. Dikhtyaruk V. V. Kuranov N. N. Romanenko 《Instruments and Experimental Techniques》2003,46(2):252-256
Investigations of a pipeline of complex configuration made it possible to analyze the possibilities of laser and holographic interferometry methods in studies of strains of three-dimensional constructions under the effect of vibrational loads. The combined application of the holographic method of induced fringes, the method of recording the amplitude–frequency characteristics of object's vibrations using a laser interferometer, and the method of recording holographic interferograms averaged in time was considered. The most dangerous resonance frequencies and pipeline sections, in which its material is subjected to maximum stresses, were revealed. 相似文献
15.
光路系统元件运动对全息测量的影响研究 总被引:2,自引:1,他引:1
本文研究激光全息三维位移测量中光路系统元件运动对测量的影响。重点分析了干版位移,参考光点光源位移和物光点光源位移对被测物体位移的测量结果的影响,并推导了相关的计算公式,最后给出了实验结果。 相似文献
16.
介绍一种基于单片机实现体全息存储系统中准确寻址的方法 ,利用光栅莫尔条纹作为角度多重体全息存储系统精密移动平台的位移检测 ,有效地削弱该系统寻址的系统误差 ,提高了全息存储系统的数据输入、读出和擦除的准确性。 相似文献
17.
18.
R. W. Smith 《Journal of microscopy》1983,129(1):29-47
Holography can be used to record, on a flat photographic plate, information about a three-dimensional object. In conventional microscopy a thin slice of an object is observed in focus and recorded. By combining microscopy and holography it is possible to encode, on the same flat record, all the depth information in a three-dimensional microscopic object, not just a single infocus section. Any section of the three-dimensional object may be subsequently reconstructed and brought into focus by using a suitable viewing system to decode the hologram. Arrangements for doing this are described. It is shown that in order to achieve the highest resolution imagery of a three-dimensional object, reversed wave reconstruction is necessary. As holograms are made and reconstructed using a coherent laser light source, holographic microscopes are easily adapted for interferometry and an example of this is described. The differences between coherent and conventional imagery are briefly considered. The coherence of the illumination gives rise to the problems of coherent noise and speckle. Coherent noise is due to stray reflections in the optical system and can be reduced by using as few surfaces as possible or by using holographic lenses. A speckle reduction technique employing a new type of holographic optical element is described and its application to the stereomicroscopy of fossil ostracods considered. 相似文献