Evaluating the effectiveness of correlation digital speckle photography method for non-destructive testing of rough surfaces

1st International Scientific School on Methods of Digital Image Processing in Optics and Photonics

物理学;计算机科学

Gorjunov, A.E.^1 ; Pavlov, P.V.^1 ; Petrov, N.V.^2

Mil. Educ. and Sci. Ctr. AF Air Force Academy Named after Prof. N.E. Zhukovsky and Y.A. Gagarin, Starih Bolshevikov 54-a, Voronezh

394064, Russia^1

Saint Petersburg National Research University of Information Technology, Mechanics and Optics, Kronverkskiy pr 49, Saint-Petersburg

197101, Russia^2

关键词: Correlation analysis;    Digital speckle photography;    Non destructive inspection;    Non destructive testing;    Numerical experiments;    Rough surfaces;    Speckle structure;    Topological charges;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/536/1/012017/pdf
DOI  :  10.1088/1742-6596/536/1/012017

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

The work is devoted to the investigation of the process of reflection of laser beams from rough surfaces with different degrees of roughness. Based on the results of numerical experiments the applicability of the method of correlation analysis of speckle-structures for non-destructive inspection of surfaces with different parameters of roughness was evaluated. The optimal ratios between the parameters of the rough surfaces and parameters of the optical system, which provide the best efficiency of the method, were determined. It was established that in case of the increase of the number of topological charges the sensitivity of the optical system to changes of parameters of surface roughness increases.