New OVD based on interferential photography recorded in holographic materials

Hans I. Bjelkhagen

doi:10.1117/12.342808

23 March 1999 New OVD based on interferential photography recorded in holographic materials

Hans I. Bjelkhagen

Proceedings Volume 3638, Holographic Materials V; (1999) https://doi.org/10.1117/12.342808
Event: Electronic Imaging '99, 1999, San Jose, CA, United States

Abstract

A new Optical Variable Device (OVD) based on an old color photographic technique (Lippmann photography, invented in 1891) is presented. Today, this type of photography can be applied as a unique security device on security documents, such as, e.g., identification cards, passports, credit cards, and other documents where a high degree of security is needed. A Lippmann photograph is very similar to holograms, currently used in this field; a unique recording of each document can be made to achieve a degree of security higher than that with mass-produced holograms. The recording of Lippmann photographs requires a special type of photosensitive medium in contact with a reflecting layer. Panchromatic silver-halide or photopolymer materials can be used and, after being recorded and processed, laminated to security documents. A special type of recording equipment is required. Lippmann photographs are virtually impossible to copy and, certainly, cannot be copied by conventional photography or color copying machines.

Citation Download Citation

Hans I. Bjelkhagen "New OVD based on interferential photography recorded in holographic materials", Proc. SPIE 3638, Holographic Materials V, (23 March 1999); https://doi.org/10.1117/12.342808

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KEYWORDS

Photography

Information security

Holograms

Photopolymers

Manufacturing

Silver

Cameras

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