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7 April 2000 Lippmann OVD for enhanced document security
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A new Optical Variable Device (OVD) technique is presented: the Lippmann OVD, based on interferential color photography. A system is under development where this type of unique photograph can be applied to personal documents as a new security device. For example, passports, travel documents, identification cards, driving licences, credit cards can carry a laminated Lippmann OVD. The Lippmann photograph is similar to the mass-produced embossed holograms, currently used in this field. However, each document can have its unique Lippmann OVD. The recording of the Lippmann OVD requires a special panchromatic photopolymer material as well as a special type of recording equipment. The main advantage of this new OVD is that it can be produced in- house by the document issuer. Lippmann OVDs are virtually impossible to copy and, certainly, cannot be copied by conventional photography or color copying machines. In addition, the authenticity of the Lippmann OVD can be verified by direct visual inspection, without the need for any equipment.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hans I. Bjelkhagen "Lippmann OVD for enhanced document security", Proc. SPIE 3973, Optical Security and Counterfeit Deterrence Techniques III, (7 April 2000);

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