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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 reconstruction. Fringes caused by in-plane rigid body motion can be compensated for, and local displacements evaluated. It is shown that an inplane 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: 20 May 1980
PDF: 5 pages
Proc. SPIE 0210, 2nd European Congress on Optics Applied to Metrology, (20 May 1980); doi: 10.1117/12.958325
Show Author Affiliations
Hans Bjelkhagen, Royal Institute of Technology (Sweden)

Published in SPIE Proceedings Vol. 0210:
2nd European Congress on Optics Applied to Metrology
Michel H. Grosmann; Patrick Meyrueis, Editor(s)

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