Holographic systems having reference beam coded holograms

Details Holographic systems having reference beam coded holograms Holographic systems having reference beam coded holograms

1977-01-14

1977-04-19

Stern, Ronald J.

G03H 112, G03H 126

Patent

active

040185036

ABSTRACT:
This invention is concerned with methods and apparatus for recording multiple exposure holograms on a film record and displaying reconstructed images of the separately recorded subjects. Means are provided, by the use of simultaneous application of multiple different reference beams, to reconstruct a plurality of images, each of which can be separately controlled in intensity or other random parameter. Also, the recording of the separate subjects can be controlled in a predetermined timed sequence, and the corresponding reconstruction of the plurality of images can be controlled in the same or different timing sequence. Means are provided for recording the separate subjects by keeping the subject and reference beam in fixed directions and rotating the plane of the recording film sheet or strip.
Encoding of the hologram record is accomplished by means of a beam scrambler which introduces random parameters, e.g. intensity variations or random path length differences, in either the reference or object beam during the formation of the hologram. The same or identical random parameter means is used during reconstruction of the hologram to decode the identifying indicia.

REFERENCES:
patent: 3296594 (1967-01-01), Van Heerden
patent: 3501216 (1970-03-01), Kogelnik
patent: 3560071 (1971-02-01), Silverman et al.
patent: 3560072 (1971-02-01), Silverman
patent: 3647275 (1972-03-01), Ward
patent: 3711177 (1973-01-01), Ward
El-Sum, Science & Technology, Nov. 1967, pp. 50-59.
La Macchia et al., Applied Optics, vol. 7, No. 1, Jan. 1968 pp. 91-94.

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