NISCAIR Online Periodicals Repository

Research Journals >
Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.42 [2004] >
IJPAP Vol.42(11) [November 2004] >

Title: Interferometry based security hologram readable with an encoded key hologram
Authors: Aggarwal, A K
Kaura, Sushil K
Sharma, Amit K
Kumar, Raj
Chhachhia, D P
Keywords: Security holograms
Optical security
Issue Date: Nov-2004
Publisher: CSIR
IPC CodeG 02B 5/32
Abstract: A simple and cost-effective method for making security holograms has been presented, which incorporates holographic interferometry as verification feature in addition to spatially separated sharp focus spots. When the security hologram is illuminated with decoding reconstructing beam generated from an encoded key hologram, two spatially separated sharp focus spots emerge at the predefined positions and can be read through a photoelectric detector array. In addition, these focused spots upon divergence in longitudinal direction further generate specific kind of interferometric fringe patterns of random profile contained in them, which are suitable for further visual inspection. These machine-readable and visual verifiable features can be used for better counterfeit-resistant security codes in embossed holograms. Recording schemes for the formation of such security holograms and typical experimental results have been presented.
Page(s): 816-819
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.42(11) [November 2004]

Files in This Item:

File Description SizeFormat
IJPAP 42(11) 816-819.pdf131.97 kBAdobe PDFView/Open
 Current Page Visits: 107 
Recommend this item


Online Submission of Articles |  NISCAIR Website |  National Knowledge Resources Consortium |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2015 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 134890 since 01-Sep-2015  Last updated on 27-May-2016Webmaster: