scholarly journals GA-based laser speckle pattern digital image correlation method for surface strain measurements

2020 ◽  
Vol 8 (3) ◽  
pp. 252-269
Author(s):  
Arka Das ◽  
Eduardo Divo ◽  
Faisal Moslehy ◽  
Alain Kassab
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Speckle Pattern ◽  
Correlation Method ◽  
Laser Speckle ◽  
Surface Strain ◽  
Image Correlation ◽  
Digital Image Correlation Method ◽  
Strain Measurements

Development of the Auto Mesh Generation Program for a Digital Image Correlation Method

2011 ◽  
Vol 462-463 ◽  
pp. 112-117
Author(s):  
Koji Tomita ◽  
Kenji Machida ◽  
Zu Guang Zhang
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Mesh Generation ◽  
Speckle Pattern ◽  
Correlation Method ◽  
Image Correlation ◽  
The Finite Element Method ◽  
Matching Method ◽  
Digital Image Correlation Method ◽  
Complicated Configuration

Since the method of performing displacement measurement and stress assessment of material by non-contact comes to capture the spotlight, study of the digital image correlation method which adopted the pattern-matching method for asking for displacement by deformation of a surface speckle pattern has been advanced. When the configuration for an analysis was settled in the rectangle and the square region, the whole-field mesh generation was also possible, but when it became a complicated configuration, the background etc. entered and mesh generation was affected. In order to solve such a problem, even if the object for an analysis was a complicated configuration, it aimed at generating a mesh automatically and obtaining appropriate analysis output in the displacement analysis and stress analysis using the generated mesh. In addition, the validity of the result was verified by the comparison with the finite element method. By this study, the convenience and availability of the digital image correlation method was improved remarkably, and it became clear to become a leading tool in health monitoring.

Digital Speckle Projection for Vibration Measurement by Applying Digital Image Correlation Method

2006 ◽  
Vol 326-328 ◽  
pp. 99-102 ◽  
Author(s):  
Fu Jun Yang ◽  
Xiao Yuan He
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
High Speed ◽  
Speckle Pattern ◽  
Plane Deformation ◽  
Correlation Method ◽  
Image Correlation ◽  
Vibration Measurement ◽  
Digital Image Correlation Method ◽  
Digital Speckle

Digital image correlation method (DICM) is described as a robust in-plane deformation measuring method due to its simple optical setup and the insensitivity against ambient noise. Based on DICM, digital speckle projection has been developed for shape measurement. This paper explores the possibilities for vibration analysis using digital speckle projection together with DICM. A digital speckle pattern, generated by computer, is projected on an object surface using an LCD projector. Then the dynamic deformation modulated speckle images are captured by a high-speed CCD camera and saved in the computer. By using the self-developed temporal sequence digital images correlation algorithm, the deformation and vibration mode can be analyzed quantitatively. The proposed method avoids using stroboscopic or laser illumination and simplifies the experimental setup for vibration measurement, while it is time-consuming thanks to calculating a large amount of correlation coefficients. The experimental performance on a harmonic-vibrating cantilever beam well demonstrates the validity of the new method.

Evaluation of the quality of a speckle pattern in the digital image correlation method by mean subset fluctuation

2011 ◽  
Vol 43 (1) ◽  
pp. 9-13 ◽  
Author(s):  
Tao Hua ◽  
Huimin Xie ◽  
Simon Wang ◽  
Zhenxing Hu ◽  
Pengwan Chen ◽  
...  
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Speckle Pattern ◽  
Correlation Method ◽  
Image Correlation ◽  
Digital Image Correlation Method
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