Electronic speckle techniques in noisy environments

Research output: Contribution to journalConference articlepeer-review

Abstract

The main sources of noise that lead to speckle phase distortion and decorrelation are identified and methods to overcome these are suggested. An automated continuous reference updating technique is shown able to avoid speckle decorrelation induced by object drift or low frequency vibrations. A second improvement using the introduction of phase shift and the addition of surface information during every image acquisition, is demonstrated to insure fringe pattern stability even in the presence of relatively high frequency noise due to thermal currents or air flow. Furthermore, phase modulation is used to reduce the speckle effect by removing the speckle phase term. The application of these techniques to the task of nondestructive detection of structural defects in aluminum plates is demonstrated in a very noisy environment.

Original languageEnglish (US)
Pages (from-to)171-178
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume2003
DOIs
StatePublished - Dec 10 1993
EventInterferometry VI: Techniques and Analysis 1993 - San Diego, United States
Duration: Jul 11 1993Jul 16 1993

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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