Pseudo-stokes vector correlation from complex signal representation of a speckle pattern and its applications to micro-displacement measurement

W. Wang, R. Ishijima, A. Matsuda, S. G. Hanson, M. Takeda

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

As an improvement of the intensity correlation used widely in conventional electronic speckle photography, we propose a new technique for displacement measurement based on correlating Stokes-like parameters derivatives for transformed speckle patterns. The method is based on a Riesz transform of the intensity speckle pattern, which converts the original real-valued signal into a complex signal. In closest analogy to the polarisation of a vector wave, the Stokes-like vector constructed from the spatial derivative of the generated complex signal has been applied for correlation. Experimental results are presented that demonstrate the validity and advantage of the proposed pseudo-Stokes vector correlation technique over conventional intensity correlation technique. © 2010 Blackwell Publishing Ltd.

Original languageEnglish
Pages (from-to)12-18
Number of pages7
JournalStrain
Volume46
Issue number1
DOIs
Publication statusPublished - Feb 2010

Keywords

  • Complex signal representation
  • Displacement and strain measurement
  • Pseudo-Stokes vector correlation
  • Riesz transform
  • Speckle photography

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