Abstract

A new optical element—a quadrolens that is used as part of a shearing speckle interferometer (shearograph) to provide the measurements of stress-strain states of objects simultaneously in two mutually perpendicular directions, has been proposed. The quadrolens consists of four identical sections cut from the original round lens and spaced from each other. It builds four object images that are shifted relative to the optical axis by a distance that depends on the size of the gaps between the sectors. The phase reconstruction using a single speckle interferogram has been performed by the spatial phase-shifting method based on the Fourier transform. An aperture diaphragm with four holes has been placed in front of the quadrolens sectors to increase the contrast of interference fringes and polarization channel isolation can be used to separate the channels and reduce the influence of cross interference. The experimental results of using a speckle interferometer with quadrolens for the study of microdeformation of a round membrane have been presented.

中文翻译：

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带有四极管的图像剪切斑点图案干涉仪

摘要

已经提出了一种新的光学元件-四极杆，该四极杆用作剪切斑点干涉仪（剪切仪）的一部分，以同时在两个相互垂直的方向上提供对象的应力-应变状态的测量值。四极管由四个相同的部分组成，这些部分从原始的圆形透镜上切下并彼此隔开。它建立了四个物体图像，这些物体图像相对于光轴移动了一个距离，该距离取决于扇区之间间隙的大小。通过基于傅立叶变换的空间相移方法已经执行了使用单个散斑干涉图的相位重建。在四象限扇形区的前面放置了一个带有四个孔的孔径光阑，以增加干涉条纹的对比度，偏振通道隔离可用于分离通道并减少交叉干扰的影响。提出了使用带有四极管的散斑干涉仪来研究圆形膜微变形的实验结果。