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20 May 1980 Measurement Of Three-Dimensional Displacement By Four Small Holograms
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Proceedings Volume 0210, 2nd European Congress on Optics Applied to Metrology; (1980)
Event: Optics, Photonics, and Iconics Engineering Meeting, 1979, Strasbourg, France
A method is given of measuring the displacement vector components by simultaneously recording four double exposure holograms of 3 x 4 cm2 each that simulate the corners of a large hologram (in the present case 35 x 24 cm2). A very divergent beam of laser light originates from the centre of the simulated large hologram and illuminates the object as well as the four mirrors, two on each side of the object. These mirrors provide the reference beams for four holograms. Through this simple set-up four interferograms are obtained. Three of them suffice to calculate the displacement vector-under the condition of the zero-order fringe being known. Two efficient modes of meeting this condition have been investigated. In case of mechanically caused deformation the surface of both the object and the holographic bench are linked by a streched elastic tape, over which the interference pattern progresses to the zero-order fringe on the bench surface. In case of thermically induced deformation the object is kinematically mounted and a selected point anchored that determines the zero-order fringe. The significant feature of this method is the simplicity of geometry, the minimal number of optical components and the large viewing angles, gained by the interspace between holograms.
© (1980) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. Petkovsek and K. Rankel "Measurement Of Three-Dimensional Displacement By Four Small Holograms", Proc. SPIE 0210, 2nd European Congress on Optics Applied to Metrology, (20 May 1980);

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