Twin suppression in digital holography by means of speckle reduction

Monaghan, David S. and Kelly, Damien P. and Pandey, Nitesh and Hennelly, Bryan M. (2009) Twin suppression in digital holography by means of speckle reduction. In: CIICT 2009 : proceedings of the China-Ireland information and communications technologies conference. National University of Ireland Maynooth, Ireland, pp. 237-240. ISBN 9780901519672

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A method for numerically removing the twin image in on-axis digital holography, based on multiple digital holograms, is discussed. The digital holograms under examination are captured experimentally using an in-line modified Mach-Zehnder interferometric setup and subsequently reconstructed numerically. The technique is suitable for both transmission and reflection geometry. Each individual hologram is recorded with a statistically independent diffuse illumination field. This is achieved by shifting a glass diffuser in the x-y plane of the object path. By recording the holograms in this manner the twin image, from a numerical reconstruction, appears as speckle. By reducing this speckle pattern the twin image can be effectively removed in the reconstruction plane. A theoretical model is developed and experimental results are presented that validate this model.

Item Type: Book Section
Additional Information: European Community's Seventh Framework Programme FP7/2007-2013 under grant agreement no. 216105. We also aknowledge support from Science Foundation Ireland (SFI).
Keywords: Digital Holography; On- Axis; Speckle; Twin reduction;
Academic Unit: Faculty of Science and Engineering > Computer Science
Item ID: 2471
Depositing User: CS Editor
Date Deposited: 09 Mar 2011 15:37
Publisher: National University of Ireland Maynooth
Refereed: Yes
Funders: European Community Seventh Framework Programme, Science Foundation Ireland

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