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31 March 1998 Quantitative and qualitative applications of conjugate-wave holographic interferometry
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Abstract
Conjugate wave holographic interferometry (CWHI) is a non- contact method for measuring deformation and strain on ordinary surfaces. It has not been widely used, however. In this paper three experiments are performed: the measurement of displacement in a simply supported beam, the measurement of the crack mouth opening displacement in a notched specimen, and a qualitative study of thermal expansion in a simply supported beam. The experimental results agreed well with the values predicted by theory. Additionally, the thermal expansion study indicated that CWHI can show the interaction of various parts of the test apparatus which can aid in interpreting experimental results. Overall, it can be concluded that CWHI is a useful method of isolating and quantitatively determining in-plane deformations with submicron precision. Based on these results, it appears that CWHI would be useful for certain nondestructive evaluation applications on components where displacements and/or strain would provide critical information. Although CWHI has only been demonstrated in a laboratory setting, its potential for nondestructive evaluation of structural composites and materials appears promising. One such example is its use for examining the behavior of graded composite materials under mechanical or thermal load. This is presently being investigated. In general, the method would be appropriate for applications where Moire interferometry could not be used.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Paul J. Gloeckner and Warren H. Stevenson "Quantitative and qualitative applications of conjugate-wave holographic interferometry", Proc. SPIE 3396, Nondestructive Evaluation of Materials and Composites II, (31 March 1998); https://doi.org/10.1117/12.301527
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