29 September 1998 Beyond the upper limit of holographic and speckle interferometry
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Proceedings Volume 3407, International Conference on Applied Optical Metrology; (1998) https://doi.org/10.1117/12.323325
Event: International Conference on Applied Optical Metrology, 1998, Balatonfured, Hungary
Abstract
Holographic interferometry has the advantage of high sensitivity but at practical loads, the fringe systems get soon too dense to be observed conveniently. One special way of overcoming this problem is provided by the comparative methods. In the present paper, comparisons of deformations up to the millimeter region will be reported in difference holographic interferometry and an extension possibility to electronic speckle pattern interferometry will be demonstrated, too. The most direct approach would be to magnify the image to the required great extent and then build up the complete fringe system from the observed tiny parts. A practical method will be suggested here which alleviates this cumbersome procedure. In addition, if the very dense fringes are already washed away by the speckles -- some integration along the fringes proves to be of real help.
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Ferenc Gyimesi, Ferenc Gyimesi, Zoltan Fuzessy, Zoltan Fuzessy, Bela Raczkevi, Bela Raczkevi, Arpad Pikethy, Arpad Pikethy, Szabolcs Balogh, Szabolcs Balogh, Jozsef Gallai, Jozsef Gallai, } "Beyond the upper limit of holographic and speckle interferometry", Proc. SPIE 3407, International Conference on Applied Optical Metrology, (29 September 1998); doi: 10.1117/12.323325; https://doi.org/10.1117/12.323325
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