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首页> 外文会议>RIAO/OPTILAS 2004 >Study of techniques speckle interferometry in a photorefractive crystal BGO: Conventional holography and double-aperture
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Study of techniques speckle interferometry in a photorefractive crystal BGO: Conventional holography and double-aperture

机译：光折射晶体BGO中的斑点干涉技术研究：常规全息术和双光圈

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The study of speckle patterns by photography or digitally have been used in a wide variety of events of measures of displacements, vibrations or small deformations, from almost static situations until high speeds. In this work a comparative analysis of experimental arrangements of speckle techniques is presented: a conventional holography and double aperture, for micro displacements of objects, in both cases, the speckle is modulated by Young strips, of such form that the first case makes reference to a modulation to high frequency, and in the second case show a low frequency, also it is had in the two techniques it is made double- exposure, one for the starting point of the object and the other for the object displacement. The registration and the reading are carried out in almost-real time in holographic arrangements using a photorefractive crystal; the information in these crystals is codified like one variation local of refraction index. In the two cases it is considered the nature in volume by registers of the speckle. The contrast of the interference fringes is analyzed in terms of the diffraction efficiency of the readout beam and of the registration parameters. The results are presented for each configuration.
机译：通过摄影或数字方式研究斑点图案已用于从几乎静止的情况到高速的各种位移，振动或小变形量度的事件。在这项工作中，我们对斑点技术的实验布置进行了比较分析：常规的全息术和双光圈，用于物体的微位移，在两种情况下，斑点均由杨氏条调制，这种形式首先涉及到调制为高频，在第二种情况下显示为低频，在两种技术中也都进行了两次曝光，一种是物体的起点，另一种是物体位移。配准和读取是使用光折变晶体以全息方式几乎实时进行的；这些晶体中的信息像折射率的一个变化局部一样被编码。在两种情况下，通过斑点的斑点将其视为体积的性质。根据读出光束的衍射效率和配准参数来分析干涉条纹的对比度。显示了每种配置的结果。

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