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Lippmann OVD Hans I. Bjelkhagen

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Presentation on theme: "Lippmann OVD Hans I. Bjelkhagen"— Presentation transcript:

1 Lippmann OVD Hans I. Bjelkhagen
Hansholo Consulting Ltd Lippmann January 2004

2 Recording Materials Panchromatic isochromatic materials required
Low light-scattering emulsions needed Ultra-high-resolution materials Possible materials: Silver halide emulsions Photopolymer materials Lippmann January 2004

3 Lippmann OVD Passport Tests
DuPont photopolymer material was used Laminated to sputtered silver foil Recorded passport samples Lippmann January 2004

4 Dark slide with photopolymer film laminated to reflecting sputtered silver foil
Lippmann January 2004

5 Optical Security for Documents
Iridescence – the fluctuation of colours in otherwise colourless matter – has become a cornerstone of optical document security Iridescent phenomena comprising: Interference Diffraction Thin films Multilayers Gratings Holograms Lippmann photographs Various optical security devices are now common on different types of documents such as banknotes, passports, driving licenses, credit cards, etc. Such devices are commonly referred to as Optical Variable Devices (OVDs) R. L. van Renesse, Ed., Optical document security, 2nd ed. Artech House, Boston, London (1998) Lippmann January 2004

6 OVD on Austrian Banknote
Lippmann January 2004

7 OVDs on Credit Cards VISA, MasterCard, American Express and many other cards have embossed holograms attached as OVDs Lippmann January 2004

8 The Lippmann OVD The Lippmann photograph represents a new type of OVD
It belongs to the : Interference Security Image Structures (ISISs) Lippmann January 2004

9 The Lippmann OVD for Enhanced Document Security
Lippmann photograph attached to a security document Lippmann OVD Security document Perpendicular observation Oblique observation Lippmann January 2004

10 Old Swedish passport tests Original Lippmann OVD
Lippmann January 2004

11 Lippmann OVD Details Lippmann January 2004

12 Swedish Passport Lippmann OVD Negative OVD Tilted OVD
Lippmann January 2004

13 The Latent Intaglio Print Image “SVERIGE” (Sweden) on the top of the Swedish Passport: Revealed when obliquely observed (upper right) Also recorded in the Lippmann OVD (lower right) Lippmann January 2004

14 US Passport sample with Lippmann OVD
Lippmann January 2004

15 US Passport with Lippmann OVD Switching between a Positive and Negative Image
Lippmann January 2004

16 Lippmann OVD Display Device
Passport sample with a Lippmann OVD attached in the upper left corner. Light from a diffuser above the passport makes it easy to inspect the Lippmann OVD laminated to the passport. Lippmann January 2004

17 Cards for military personnel, police officers, custom inspectors, etc.
The Lippmann OVD is only of interest for documents individually issued, such as: Identification cards, e.g., corporate ID cards (air pilot’s ID cards, nuclear power plant employees) Cards for military personnel, police officers, custom inspectors, etc. Travel documents (e.g. Shengen visa) Driving licences Passports Credit cards Lippmann January 2004

18 Advantages over embossed holograms
A Lippmann OVD can be individually made A unique label for each document The issuer of the document can produce them in-house The Lippmann OVD has a very high archival stability The Lippmann OVD is Bragg sensitive The Lippmann OVD can record latent images The Lippmann OVD cannot be copied by conventional colour photography, colour scanners or colour copy machines Lippmann January 2004

19 Publications on Lippmann Photography applied in the field of document security:
H. I. Bjelkhagen, “New optical security device based on one-hundred year old photographic technique,” Opt. Eng. 38, (1999) H. I. Bjelkhagen, “A new OVD based on interferential photography recorded in holographic materials,” in Proc. SPIE 3638, (1999) H. I. Bjelkhagen, “Lippmann Photography: A highly innovative OVD based on existing photographic techniques,” Keesing's Journal of Documents 1, Issue 2, (2003) Lippmann January 2004

20 Contact Details Dr Hans I. Bjelkhagen
Lippmann January 2004

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