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Proceedings Paper

Holographic interferometry of high spatial resolution for the study of relative displacements of small grains in natural stones
Author(s): Claudia Hoelscher; Klaus D. Hinsch; Gerd Guelker
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Paper Abstract

Subject of the investigation are time dependent processes that cause small particles in rough surfaces to displace or deform. These small particles must be identified in a region several cm2 in size. The method proposed is a simultaneous application of electronic speckle pattern interferometry (ESPI) and a holographic double exposure technique using suited carrier fringe systems. The time dependence of the process is observed by ESPI indicating suitable states of the process to be compared by the double exposure technique. Detection of displacement and identification of the particles takes place in the reconstruction real image of the double exposure hologram. The real image was chosen because of the better accessibility of the finely spaced carrier fringes. The resolution obtainable with this method is subject of discussion. The power of the method is illustrated experimentally.

Paper Details

Date Published: 1 January 1992
PDF: 10 pages
Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); doi: 10.1117/12.135321
Show Author Affiliations
Claudia Hoelscher, Carl-von-Ossietzky Univ. Oldenburg (Germany)
Klaus D. Hinsch, Carl-von-Ossietzky Univ. Oldenburg (Germany)
Gerd Guelker, Carl-von-Ossietzky Univ. Oldenburg (Germany)

Published in SPIE Proceedings Vol. 1553:
Laser Interferometry IV: Computer-Aided Interferometry
Ryszard J. Pryputniewicz, Editor(s)

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