This paper examines the feasibility of a new hybrid method which combines Digital Image Correlation (DIC) with Laser Speckle based methods, called Digital Laser Speckle Image Correlation (DiLSIC). Consequently, this method does not require any sample preparation and allows for the measurement of displacement of micro structures in addition to large displacements. In this technique, a coherent 30mW-632nm laser beam is expanded with 40X lens and then illuminated on the target surface to produce a fine, homogenous laser speckle pattern. Then, images before and after applying deformation were captured to inspect the response of the sample to any external load based on the DIC method. This technique could measure displacement less than 30-µm with high accuracy when a 120mm × 80mm area of the surface was inspected. [0-10%] strain values were measured by this technique with high accuracy during the whole range. Additionally the sub-surface crack was located successfully, which is a revolutionary achievement in NDT optical methods.
1. J. Perie, S. Calloch, C. Cluzel and F. Hild,2002,” Analysis of a Multiaxial Test on a C/C Composite by Using Digital Image Correlation and a Damage Model”, Vol 42, No 3. Universite Paris 6, Cedex, France.
2. F. Laurin, J.-s. Charrier, D. Leveque, J.-F. Mair, A. Mavel, P. Nunez,2012, “ Determination of the properties of composite materials thanks to digital image correlation measurements”, Procedia IUTAM 4 , Cedex, France.
3. J. Tyson and T. Schmidt, Optical Deformation & Strain Measurement in Biomechanics, GOM mbH.
4. T. C. Chu, W. F. Ranson, M. A. Sutton and W. H. Peters, "APPLICATIONS OF DIGITAL-IMAGE-CORRELATION TECHNIQUES TO EXPERIMENTAL MECHANICS," Experimental Mechanics, vol. 3, no. 25, pp. 232-244, 1985.
5. T. Chu, A. Mahajan and C. T. Liu, "An Economical Vision-Based Method to Obtain Whole-Field Deformation Profiles,," Experimental Techniques, vol. 6, no. 26, pp. 25-28, 2002.
6. J .L. W. Carter, Michael. D. Uchic, Michael J. Mills,” Impact of Speckle Pattern Parameters on DIC Strain Resolution Calculated from in-situ SEM experiments”, The Ohio State University, Columbos, OH.
7. T. A. Berfield, J. K. Patel, R. G. Shimmin and etc, 2007, “Micro and Nanoscale measurement of Surface and Internal Plane via Digital Image Correlation”, Society for experimental Mechanics.
8. Y. Su, X. Xu and Q. Zhang , 2016“Quality assessment of speckle patterns for DIC by consideration of both systematic errors and random errors”, Optics and Lasers in Engineering, University of science and Technology, China.
9. S. Yoshida,Muchair, I. Muhamad, R. Widiastuti and A. Kusnowo, “ Optical Interferometric technique for deformation Analysis”, Research and development center for applied physics, Serpong, Indonasia.
10. J. Gryagoridis, 212, “Laser Based Nondestructive Inspection Technique” , Springer Science+ Business Media, LLC, Department of Mechanical Engineering, Cape Peninsula University of Technology, Cape Town, South Africa.
11. J. Brillaud and F. Lagattu,2002, “Limits and Possibilities of Laser Speckle and White-Light image correlation methods: Theory and experiments”, Optical Society of America.
12. L. M. Richards, S. M. Shams Kazmi, J. L. Davis , A. K. Dunn and K. E. Olin, 2010, “Low-cost Laser Speckle Contrast Imaging of blood flow using a webcam”, Department of Biomedical Engineering, The University of Texas at Austin, Austin, TX.
13. W. Dandach , J. Molimard and P. Picart, ,” Direct Strain And Slope Measurement Using 3D DSPSI”, LTDS, UMR 5513, École Nationale Supérieure des Mines, SMS-EMSE, CNRS, Saint-Étienne, France.
14. P. L. Reu, and B. D. Hansche, “Digital Image Correlation combined with Electronic Speckle Pattern interferometry for 3D Deformation Measurement in Small Samples”, Sandia National Laboratories, PO Box 5800, Albuquerque, NM 87185.
15. H. Taheri, F. Delfanian and J. Du, 2013, “Wireless NDI for Aircraft Inspection”, ASNT 22nd research symposium.
164 Page Views
0 PDF Downloads
0 Facebook Shares