Single-shot depth-resolved displacement field measurement using phase-contrast polychromatic speckle interferometry

Pablo D. Ruiz; Manuel de la Torre-Ibarra; Jonathan M. Huntley

doi:10.1117/12.695305

15 September 2006 Single-shot depth-resolved displacement field measurement using phase-contrast polychromatic speckle interferometry

Pablo D. Ruiz, Manuel de la Torre-Ibarra, Jonathan M. Huntley

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Proceedings Volume 6341, Speckle06: Speckles, From Grains to Flowers; 63410U (2006) https://doi.org/10.1117/12.695305
Event: Speckle06: Speckles, From Grains to Flowers, 2006, Nimes, France

Abstract

We describe a system for measuring sub-surface displacement fields within a scattering medium using a broadband super-luminescent light emitting diode (SLED) source and spectral imaging. The use of phase information in the backscattered speckle pattern offers displacement sensitivity in the range of a few tens of nm, some two to three orders of magnitude better than the depth resolution of state-of-the-art Optical Coherence Tomography systems. The system is based on low cost components and has no moving parts. It provides displacement maps within a 2-D slice extending into the sample, and the fact that all the data for a given deformation state are acquired in a single shot is a highly attractive feature for in-vivo investigations in the biological sciences. The theoretical basis for the system is presented along with experimental results from a simple well-controlled geometry consisting of independently-tilting glass sheets. Results are validated using standard two-beam interferometry. Scattering samples were also studied and we show a wrapped phase map through the thickness of a pig ex-vivo cornea. The phase change was due to viscoelastic creep in the cornea after a change in the intraocular pressure.

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Pablo D. Ruiz, Manuel de la Torre-Ibarra, and Jonathan M. Huntley "Single-shot depth-resolved displacement field measurement using phase-contrast polychromatic speckle interferometry", Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 63410U (15 September 2006); https://doi.org/10.1117/12.695305

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KEYWORDS

Interferometry

Optical coherence tomography

Phase measurement

Remote sensing

Scattering

Beam splitters

Cornea

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