Holographic interfermetry for security and forensic applications.
Ambadiyil, Sajan; Sreelekshmi, R.C.; Pillai, V.P. Mahadevan; Prabhu, Radhakrishna
V.P. Mahadevan Pillai
Robert James Stokes
Security holograms having unique 3D images are one of the tools for enhancing the security for product and personnel authentication and anti-counterfeiting. Apart from the high technology that is required, the uniqueness of a 3D object presents a significant additional threshold for the counterfeiting of such security holograms. But, due to the development of 3D printing technology, the hurdles are disabled and allow the chances of counterfeiting. In order to overcome this, holographic interferometry is effectively utilized and the object is recorded twice before and after the state of random object change. At the time of reconstruction, two signal waves generated simultaneously interfere each other, resulting in a fringe modulation. This fringe modulation in 3D image hologram with respect to the random object change is exploited to generate a rigid and unique anticounterfeit feature. Though holographic interferometry techniques are being widely used for the non-destructive evaluation, the applicability of this technology for the security and forensic activity is less exploited. This paper describes our efforts to introduce holographic interferometry in 3D image holograms for security and forensic applications.
|Start Date||Sep 26, 2016|
|Publication Date||Oct 24, 2016|
|Publisher||Society of Photo-optical Instrumentation Engineers|
|Series Title||Proceedings of SPIE|
|Institution Citation||AMBADIYIL, S., SREELEKSHMI, R.C., PILLAI, V.P.M. and PRABHU, R. 2016. Holographic interfermetry for security and forensic applications. In Burgess, D., Owen, G., Bouma, H., Carlysle-Davies, F., Stokes, R.J. and Yitzhaky, Y. (eds.) Proceedings of the 12th Optics and photonics for counterterrorims, crime fighting and defence conference 2016: co-located with Society of Photographic Instrumentation Engineers (SPIE) security and defence conference, 26-27 September 2016, Edinburgh, UK. Proceedings of SPIE, 9995. Bellingham: SPIE [online], article ID 999502. Available from: https://doi.org/10.1117/12.2242153|
|Keywords||Holographic interferometry; Holograms; Modulation; Nondestructive evaluation; 3D printing|
AMBADIYIL 2016 Holographic interfermetry for security
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