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Keywords: digital image correlation, dynamic three-dimensional digital image correlation, prism.

Summary

The three-dimensional measurements of objects are very important information for manufacturing processes in mechanical engineering as well as detecting and monitoring of civil engineering applications. Particularly, the application of laser scanning technology can achieve comprehensive measurements for the monitoring of large civil engineering projects. But, the laser scanning technology cannot be applied to dynamic measurements.

Digital cameras have been widely used all over the world. Traditionally, more than one camera is widely applied for three-dimensional image processes. In this study, the practicability of the technology developed in this research using a single camera to detect three-dimensional images for analyzing the surface geometry or three-dimensional motion of an object was verified.

The digital image correlation method (DIC) is a non-contact measurement technology which can provide the displacement field as well as strain field of the object to be inspected. Presently, the three-dimensional digital image correlation method using more than two video capture devices is also equipped with the high accuracy of the DIC method and a three-dimensional measurement capability. However, the two cameras cannot ensure the synchronization of the circumstances, hence the error in a dynamic environment is serious. This paper introduces an innovative three-dimensional DIC developed by the DIC research team, Taiwan, which uses a digital camera and a specially shaped prism. Because of the use of a single image capturing device, so there is no drive time asynchronous problem. The principles of this proposed technology and its verification results are given in this study.

The research proposed a three-dimensional DIC with very good mobility. The only one hardware required is a spine-type prism and eventually a green light filter. In many cases, the green-light filter can be left out, because the digital camera can filter out the red and blue light itself. The test results indicate that the proposed method can fully overcome the synchronization problem of the traditional method.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 96 PROCEEDINGS OF THE THIRTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: B.H.V. Topping and Y. Tsompanakis Paper 114 Innovative Three Dimensional Digital Image Correlation Technology for Dynamical Measurement M.H. Shih¹, S.H. Tung² and W.P. Sung³ ¹Department of Civil Engineering, National Chi Nan University, Nantou, Taiwan ²Department of Civil and Environmental Engineering, National University of Kaohsiung, Taiwan ³Department of Landscape Architecture, National Chin-Yi University of Technology, Taichung, Taiwan doi:10.4203/ccp.96.114 purchase the full-text of this paper Full Bibliographic Reference for this paper M.H. Shih, S.H. Tung, W.P. Sung, "Innovative Three Dimensional Digital Image Correlation Technology for Dynamical Measurement", in B.H.V. Topping, Y. Tsompanakis, (Editors), "Proceedings of the Thirteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 114, 2011. doi:10.4203/ccp.96.114 Keywords: digital image correlation, dynamic three-dimensional digital image correlation, prism. Summary The three-dimensional measurements of objects are very important information for manufacturing processes in mechanical engineering as well as detecting and monitoring of civil engineering applications. Particularly, the application of laser scanning technology can achieve comprehensive measurements for the monitoring of large civil engineering projects. But, the laser scanning technology cannot be applied to dynamic measurements. Digital cameras have been widely used all over the world. Traditionally, more than one camera is widely applied for three-dimensional image processes. In this study, the practicability of the technology developed in this research using a single camera to detect three-dimensional images for analyzing the surface geometry or three-dimensional motion of an object was verified. The digital image correlation method (DIC) is a non-contact measurement technology which can provide the displacement field as well as strain field of the object to be inspected. Presently, the three-dimensional digital image correlation method using more than two video capture devices is also equipped with the high accuracy of the DIC method and a three-dimensional measurement capability. However, the two cameras cannot ensure the synchronization of the circumstances, hence the error in a dynamic environment is serious. This paper introduces an innovative three-dimensional DIC developed by the DIC research team, Taiwan, which uses a digital camera and a specially shaped prism. Because of the use of a single image capturing device, so there is no drive time asynchronous problem. The principles of this proposed technology and its verification results are given in this study. The research proposed a three-dimensional DIC with very good mobility. The only one hardware required is a spine-type prism and eventually a green light filter. In many cases, the green-light filter can be left out, because the digital camera can filter out the red and blue light itself. The test results indicate that the proposed method can fully overcome the synchronization problem of the traditional method. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £130 +P&P)
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