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Proceedings Paper

Dimensional Measurements From An Object's Hologram
Author(s): J. Gryzagoridis; L. P. Adams
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Paper Abstract

The paper presents a feasibility study of obtaining reliable space measurements of dimension on a small object, from the three-dimensional virtual image of the object's hologram. Associated with the main objective of this paper as described above, detailed information is presented on the actual technique of obtaining a hologram, the type of holographic film used, exposure tines, and developing and bleaching procedures. Using the transmission holographic technique, good quality holograms of small objects were obtained. These holograms, when viewed in a reconstructed reference beam set-up, produced a good quality virtual or orthoscopic image. In a set-up involving the holographic reference beam, reproduced around a reflex metrograph, orthogonal co-ordinates of various points on the virtual image were obtained. Four sets of measurements were obtained, averaged and the results were compared with a set of measurements obtained from the actual object when using a reflex microscope. By rotating the axis frames of the two instruments into a common reference axis set, direct comparison of the co-ordinates and dimensions of the object, obtained by the two methods, was effected. Since the maximum error obtained in the comparison of any co-ordinate was of the order of 1.0%, it was concluded that mensuration of dimensions from the virtual holographic image of an object is possible.

Paper Details

Date Published: 1 September 1987
PDF: 16 pages
Proc. SPIE 0674, 17th Intl Congress on High Speed Photography and Photonics, (1 September 1987); doi: 10.1117/12.975559
Show Author Affiliations
J. Gryzagoridis, University of Cape Town (South Africa)
L. P. Adams, University of Cape Town (South Africa)

Published in SPIE Proceedings Vol. 0674:
17th Intl Congress on High Speed Photography and Photonics
Donald Hollingworth; Maurice W. McDowell, Editor(s)

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