光学
斑点图案
表面粗糙度
材料科学
散斑噪声
涡流
表面光洁度
旋涡
物理
热力学
复合材料
梁(结构)
作者
M. H. M. Passos,Môsar Lemos,Sandro Rogério de Almeida,W. F. Balthazar,Ladário da Silva,J. A. O. Huguenin
出处
期刊:Applied optics
[The Optical Society]
日期:2017-01-09
卷期号:56 (2): 330-330
被引量:16
摘要
In this work, we report on the analysis of speckle patterns produced by illuminating different rough surfaces with an optical vortex, a first-order (l=1) Laguerre-Gaussian beam. The generated speckle patterns were observed in the normal direction exploring four different planes: the diffraction plane, image plane, focal plane, and exact Fourier transform plane. The digital speckle patterns were analyzed using the Hurst exponent of digital images, an interesting tool used to study surface roughness. We show a proof of principle that the Hurst exponent of a digital speckle pattern is more sensitive with respect to the surface roughness when the speckle pattern is produced by an optical vortex and observed at a focal plane. We also show that Hurst exponents are not so sensitive with respect to the topological charge l. These results open news possibilities of investigation into speckle metrology once we have several techniques that use speckle patterns for different applications.
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