Renseignements généraux

Nº de série

S/O

Nº de partie

1

Nombre total de parties

1

Ou

S/O

Brevets

S/O

Description générale

glass hologram & cover plate/ aluminum frame/ metal hardware

Dimensions

Remarque : Cette information reflète la taille générale pour l’entreposage et ne représente pas nécessairement les véritables dimensions de l’objet.

Longueur

16,4 cm

Largeur

13,8 cm

Hauteur

S/O

Épaisseur

1,0 cm

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Physique

Catégorie

Lumière et radiation électromagnétique

Sous-catégorie

S/O

Fabricant

Ou

Johnston

Pays

Canada

État/province

Québec

Ville

Beauport

Contexte

Pays

Canada

État/province

Ontario

Période

late 1980s

Canada

A Canadian made hologram, collected for the exhibit "Images in Time & Space" mounted by the Associates of Science & Technology (AST) & NMST circa 1988-1989.

Fonction

A medium which presents a three dimensional image, in this case of a china dog.

Technique

An example of an animated hologram, a strip hologram made by using the geometry of regular Fresnel or Fourier transform holography. Moving the object slightly between exposures permits motion to be simulated, as in an animated motion picture. The method uses a 0.5-m W HeNe laser to produce a hologram with a number of slit-shaped exposures displaced along the vertical direction. The reconstructed virtual image is viewed by moving the eyes vertically with respect to the film, thereby looking through different "windows". The hologram retains full horizontal parallax, but the slit aperture reduces the vertical viewing angle of the animated object (Ref. 1). A Fresnel hologram is produced when the object being holographed is near the plate, so that the object beam wavefronts are spherical (Ref. 3). The theory of holography was developed in 1947 by British/Hungarian scientist Dr. Dennis Gabor while working to improve the resolution of electron microscopes. In 1960 the laser was invented and its pure white light was ideal for holography. In 1962 Emmett Leith and Juris Upatnieks of the University of Michigan, combined Gabor's theory with their own work in side-reading radar and applied it to holography, resulting in the off-axis technique of hologram production still in use & the first laser transmission hologram. Also in 1962 Dr. Yuri N. Denisyuk of the U.S.S.R combined holography with Gabriel Lippmann's work in natural colour photography to produce a white-light reflection hologram which, for the first time, could be viewed in light from an ordinary incandescent light bulb. By 1965 Leith, Upatnieks & other U.S. researchers had developed off-axis reflection holograms (Ref. 2).

Notes sur la région

Inconnu

Détails

Marques

black handwritten lettering on back of frame appears to read "NO. 1CNROS"

Manque

appears complete

Fini

colourless transparent glass

Décoration

S/O