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Digital holographic moiré for the direct and simultaneous estimation of strain and slope fields.

Authors
  • Kulkarni, Rishikesh
  • Rastogi, Pramod
Type
Published Article
Journal
Optics Express
Publisher
The Optical Society
Publication Date
Sep 22, 2014
Volume
22
Issue
19
Pages
23192–23201
Identifiers
DOI: 10.1364/OE.22.023192
PMID: 25321788
Source
Medline
License
Unknown

Abstract

A novel method is proposed for the direct and simultaneous estimation of multiple phase derivatives corresponding to strain and slope fields from a single moiré fringe pattern in digital holographic moiré. The interference field in a given row/column is a multicomponent complex exponential signal and is represented as a spatially-varying autoregressive (SVAR) process. The spatially-varying coefficients of the SVAR model are computed by approximating them as the linear combination of linearly independent basis functions. Further, the spatially varying poles of the transfer function corresponding to the SVAR model are computed which provide the accurate estimation of the multiple phase derivatives. The simulation and experimental results are provided to substantiate the effectiveness of the proposed method.

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