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|Title:||Combined digital speckle shearing interferometry and digital image correlation for analysing vibrating objects|
|Authors:||Chau, F.S. |
|Source:||Chau, F.S., Zhou, J. (2001). Combined digital speckle shearing interferometry and digital image correlation for analysing vibrating objects. Proceedings of SPIE - The International Society for Optical Engineering 4317 : 380-385. ScholarBank@NUS Repository. https://doi.org/10.1117/12.429606|
|Abstract:||Digital speckle shearing interferometry (DSSI) is an optical method for measuring displacement derivatives directly and has gained wide acceptance for many industrial applications. Although it has a reputation for being insensitivity to vibration, an unfavorable environment may cause severe deterioration of the typical double-eye fringe pattern, making interpretation difficult. Digital image correlation (DIC) has been found to be capable of detecting displacements of points on images of illuminated object surfaces to a high degree of accuracy. This is achieved through a relatively simple set-up. This paper presents a method of compensating for any vibration of the object under study and thus alleviating the adverse effects of vibration on the quality of fringe patterns obtained by DSSI. This is achieved by incorporating DIC into DSSI before the image subtraction phase of the technique. It is shown that good quality fringes can be obtained successfully for specimens vibrating at 25 Hz with amplitudes of u p to 1 mm.|
|Source Title:||Proceedings of SPIE - The International Society for Optical Engineering|
|Appears in Collections:||Staff Publications|
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