3D shape measurement using deterministic phase retrieval and a partially developed speckle field

Percival F. Almoro, Laura Waller, Mostafa Agour, Claas Falldorf, Giancarlo Pedrini, Wolfgang Osten, Steen Grüner Hanson

Research output: Contribution to journalConference articlepeer-review

Abstract

For deterministic phase retrieval, the problem of insignificant axial intensity variations upon defocus of a smooth object wavefront is addressed. Our proposed solution is based on the use of a phase diffuser facilitating the formation of a partially-developed speckle field (i.e., a field with both scattered-wave and unperturbed-wave components). The smooth test wavefront impinges first on the phase diffuser producing the speckle field. Then two speckle patterns with different defocus are recorded at the output plane of a 4f-optical filtering setup with a spatial light modulator (SLM) in the common Fourier domain. The local variations of the recorded speckle patterns and the defocus distance approximate the axial intensity derivative which, in turn, is required to recover the wavefront phase via the transport of intensity equation (TIE). The SLM setup reduces the speckle recording time and the TIE allows direct (i.e., non-iterative) calculation of the phase. The pre-requisite partially-developed speckle field in our technique facilitates high image contrast and significant axial intensity variation. Wavefront reconstruction for the 3D refractive test object used demonstrates the effectiveness of the technique.
Original languageEnglish
JournalProceedings of SPIE, the International Society for Optical Engineering
Volume8384
Pages (from-to)83840Q
ISSN0277-786X
DOIs
Publication statusPublished - 2012
EventSPIE Defense, Security, and Sensing : Three-Dimensional Imaging, Visualization, and Display 2012 - Baltimore, MD, United States
Duration: 24 Apr 201225 Apr 2012
http://spie.org/app/program/index.cfm?fuseaction=conferencedetail&conference=8384

Conference

ConferenceSPIE Defense, Security, and Sensing : Three-Dimensional Imaging, Visualization, and Display 2012
Country/TerritoryUnited States
CityBaltimore, MD
Period24/04/201225/04/2012
Internet address

Keywords

  • Wavefront reconstruction
  • Phase retrieval
  • Digital holography
  • Speckle
  • Wave propagation
  • Diffraction
  • Diffuser
  • Phase
  • Spatial light modulator
  • Transport of intensity equation

Fingerprint

Dive into the research topics of '3D shape measurement using deterministic phase retrieval and a partially developed speckle field'. Together they form a unique fingerprint.

Cite this