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Proceedings Paper

Archival Properties Of Holograms
Author(s): Ralph E. Jacobson; Kevin C. Brown
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Paper Abstract

A general review is given on the archival permanence of high resolution images and holograms recorded in silver halide emulsions, together with the influences of expected degradations on the image quality that may occur in stored holograms. Emphasis is placed on silver image absorption (amplitude) holograms which have been subjected to incubation experiments to simulate and accelerate ageing conditions, employing an elevated temperature of 600C and 70% relative humidity for periods of upto 30 days, in the presence of varying amounts of residual thiosulphate ion. Degradations in image quality have been quantified in terms of signal-to-noise ratio and resolution changes. Changes in morphology of the image have been demonstrated by changes in optical density and spectral density. The effects of oxidizing gases have also been investigated using extreme conditions to simulate microspot or redox blemishes, employing 500 ppm of hydrogen peroxide at 50°C. and 80% relative humidity for periods of upto 7 days. Image quality has also been quantified for. these conditions in terms of signal-to-noise and resolution changes. The archival limits for residual thiosulphate ion are discussed and some preliminary recommendations are made for minimising problems of image deterioration in stored holograms.

Paper Details

Date Published: 25 May 1989
PDF: 8 pages
Proc. SPIE 1051, Practical Holography III, (25 May 1989); doi: 10.1117/12.951458
Show Author Affiliations
Ralph E. Jacobson, Polytechnic of Central London (England)
Kevin C. Brown, Polytechnic of Central London (England)


Published in SPIE Proceedings Vol. 1051:
Practical Holography III
Stephen A. Benton, Editor(s)

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