Phase-Shifting Interferometry by Amplitude Modulation

Phase-Shifting Interferometry by Amplitude Modulation
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通过调幅进行相移干涉测量

DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
U. Rivera
U. Rivera
中科院分区：
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文献类型：
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作者：
C. Meneses;U. Rivera

文献摘要

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在光学中，两束或多束光在空间任何一点的叠加都会产生干涉条纹。当这些条纹被应用于解决工业中的问题或它们与物理、化学、生物等领域中感兴趣的研究物质的某些性质有关时，对他们的评价是一项十分必要的工作。作为条纹评估的结果，用于相位提取的最常用的方法之一是基于干涉光束之间的相位改变已知值，而它们的振幅保持恒定。它被称为相移干涉测量法，相位采样干涉测量法或相位步进干涉测量法，缩写为“PSI”（Schwider，1990）。在该技术中，创建了一组相位变化的N个干涉图，其由一组N个方程表示，其中每个方程具有称为背景光、调制光和物体相位的三个未知量。在PSI技术的应用期间，这些空间未知数被认为是恒定的。这样就形成了一个3 N偏振系统，因此在3 N偏振时就可以分辨.已经提出了许多引入恒定相位的方法，例如通过改变光频率、波长、折射率、距离、光路;而且还利用光的一些性质或效应，例如偏振、衍射、塞曼效应、多普勒效应（Schwider，1990; Malacara，2007）。在本章中，我们的主要兴趣是提出一种新的方法，根据电场的振幅调制在干涉图中产生相位变化（Meneses-Fabian和Rivera-Ortega，2011）。
In optics, the superposition of two or more light beams at any point over space can produce the apparition of interference fringes. When these fringes are applied to resolve a problem in industry or they are related with some property of an investigation matter of interest in some area of physics, chemistry, biology, etc., the evaluation of them is a very necessary task. One of the most used methods for phase extraction, as a result of fringes evaluation, is based on a phase change between the interference beams by a known value, while their amplitudes are keeping constant. It is called phase-shifting interferometry, phase-sampling interferometry, or phase-stepping interferometry, which are abbreviated by “PSI” (Schwider, 1990). In this technique a set of N interferograms changed in phase are created, which are represented by a set of N equations, where each equation has three unknowns called as background light, modulation light and the object phase. These spatial unknowns are considered constant during the application of the PSI technique. Then a 3 N  system is formed and therefore it can be resolved when 3 N  . Many methods to introduce a constant phase have been proposed as for example by changing the optical frequency, wavelength, index of refraction, distance, optical path, for instance; but also with some properties or effect of the light such as the polarization, diffraction, Zeeman effect, Doppler effect, for instance (Schwider, 1990; Malacara, 2007). In this chapter, our major interest aims to propose a new method to generate a phase change in the interferogram based on the amplitude modulation of the electric field (Meneses-Fabian and Rivera-Ortega, 2011).