| Improvement of measurement error for modified coherent gradient sensing | |
| Yao, XF ; Xu, W ; Yeh, HY | |
| 2010-05-07 ; 2010-05-07 | |
| 关键词 | modified coherent gradient sensing fringe order crack interference measurement error CGS VISUALIZATION CURVATURE Engineering, Multidisciplinary Instruments & Instrumentation |
| 中文摘要 | Recently, a novel optical method, coherent gradient sensing (CGS), has been widely used in the study of deformation near crack tips under quasi-static and dynamic conditions, which can produce high contrast fringes and provide some degree of control on the sensitivity of measurement during experiment. It involves a simple optical set-up and is relatively insensitive to vibrations and rigid body motions. Like other interferometries, such as electronic speckle pattern interferometry, moire method, etc, the accuracy of the fringe order in the CGS interference image will deeply influence the precision of experimental study. But because of the different optical principle, the fringe order of CGS cannot be obtained through the phase-shift technology. In this paper, a modified CGS method is introduced and analysed, which can accurately obtain the fringe order of a random position in the CGS interference image. The modified CGS method needs two original CGS optical set-ups, and can be used in static and dynamic conditions, which requires no complicated image processing techniques. Static fracture experiments on mode-I crack in homogeneous materials show that this modified method can evidently improve the measurement precision of the CGS method. |
| 语种 | 英语 ; 英语 |
| 出版者 | IOP PUBLISHING LTD ; BRISTOL ; DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND |
| 内容类型 | 期刊论文 |
| 源URL | [http://hdl.handle.net/123456789/16242]  |
| 专题 | 清华大学 |
| 推荐引用方式 GB/T 7714 | Yao, XF,Xu, W,Yeh, HY. Improvement of measurement error for modified coherent gradient sensing[J],2010, 2010. |
| APA | Yao, XF,Xu, W,&Yeh, HY.(2010).Improvement of measurement error for modified coherent gradient sensing.. |
| MLA | Yao, XF,et al."Improvement of measurement error for modified coherent gradient sensing".(2010). |
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