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Depth-resolved phase imaging

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journal contribution
posted on 13.02.2015, 16:41 authored by Jonathan Huntley, Pablo RuizPablo Ruiz
Traditional full-field interferometric techniques (speckle, moiré, holography etc) encode the surface deformation state of the object under test in the form of 2-D phase images. Over the past 10 years, a family of related techniques (Wavelength Scanning Interferometry, Phase Contrast Spectral Optical Coherence Tomography (OCT), Tilt Scanning Interferometry and Hyperspectral Interferometry) has emerged that allows one to measure the volume deformation state within weakly-scattering objects. The techniques can be thought of as combining the phase-sensing capabilities of Phase Shifting Interferometry and the depth-sensing capabilities of OCT. This paper provides an overview of the techniques, and describes a theoretical framework based on the Ewald sphere construction that allows key parameters such as depth resolution and displacement sensitivity to be calculated straightforwardly for any given optical geometry and wavelength scan range. Finally, the related issue of robust phase unwrapping of noisy 3-D wrapped phase volumes is also described.

Funding

The work was supported in part by the Engineering and Physical Sciences Research Council, and by the Royal Society.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

IUTAM SYMPOSIUM ON FULL-FIELD MEASUREMENTS AND IDENTIFICATION IN SOLID MECHANICS, 2011

Volume

4

Pages

82 - 91 (10)

Citation

HUNTLEY, J.M. and RUIZ, P.D., 2012. Depth-resolved phase imaging. Procedia IUTAM, 4 pp. 82 - 91.

Publisher

© Elsevier B.V.

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 Unported (CC BY-NC-ND 3.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by-nc-nd/3.0/

Publication date

2012

Notes

This is an article from a special issue of the serial, Procedia IUTAM with papers from the IUTAM Symposium on Full-field Measurements and Identification in Solid Mechanics. The issue is published by Elsevier as open access under a CC-BY-NC-ND 3.0 licence.

ISSN

2210-9838

Language

en

Editor(s)

Espinosa, H.D.;Hild, F.

Location

Cachan, FRANCE