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Proceedings Paper

Sandwich Holography For Compensation Of Rigid Body Motion And Reposition Of Large Objects
Author(s): Hans Bjelkhagen
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Paper Abstract

New possibilities for engineering uses of hologram interferometry are shown by two experiments. Sandwich holography has been used for measurements of in-plane displacement of an object. The sign of the displacement is found by tilting the sandwich hologram during re-construction. Fringes caused by in-plane rigid body motion can be compensated for, and local displacements evaluated. It is shown that an in-plane motion of more than 1 mm of the object placed at a distance of about 1 m from the plates can be compensated for and a local tilt of 1.5 x 10-3 degrees evaluated. An object, 1 m long was placed in a fixture and a recording of the object was performed on one of the plates in the sandwich pair. Then the object was removed from the fixture as well as the holographic laboratory and holes were drilled in one wall of the object in a workshop. Then the object was put back in the fixture and the second plate in the sandwich pair was recorded. At reconstruction the influence caused by a slight reposition error was compensated for by tilting the sandwich hologram and then the deformation around the drilled holes could be studied.

Paper Details

Date Published: 14 May 1980
PDF: 7 pages
Proc. SPIE 0215, Recent Advances in Holography, (14 May 1980); doi: 10.1117/12.958424
Show Author Affiliations
Hans Bjelkhagen, Royal Institute of Technology (Sweden)

Published in SPIE Proceedings Vol. 0215:
Recent Advances in Holography
Poohsan N. Tamura; Tzuo-Chang Lee, Editor(s)

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