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Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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Related Experiment Video

Updated: Jul 6, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Spatial versus temporal phase shifting in electronic speckle-pattern interferometry: noise comparison in phase maps.

J Burke1, H Helmers

  • 1Fachbereich 8-Physik, Carl von Ossietzky Universität Oldenburg, Postfach 2503, D-26111 Oldenburg, Germany.

Applied Optics
|March 20, 2008
PubMed
Summary

This study compares temporal and spatial phase shifting in electronic speckle-pattern interferometry, defining a figure of merit to quantify deformation phase map quality under varying conditions.

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Last Updated: Jul 6, 2026

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Area of Science:

  • Optical Metrology
  • Interferometry
  • Materials Science

Background:

  • Electronic speckle-pattern interferometry (ESPI) is crucial for measuring surface deformation.
  • Phase shifting techniques enhance the accuracy of deformation measurements in ESPI.
  • Quantitative comparison of temporal and spatial phase shifting methods in ESPI is needed.

Purpose of the Study:

  • To quantitatively compare temporal and spatial phase shifting methods in ESPI.
  • To define and measure a figure of merit for deformation phase map quality.
  • To explore the characteristic behaviors of both phase shifting methods under various experimental parameters.

Main Methods:

  • Utilized electronic speckle-pattern interferometry (ESPI) with both temporal and spatial phase shifting.
  • Analyzed noise in sawtooth fringes to develop a figure of merit.
  • Measured the figure of merit for different in-plane and out-of-plane sensitive ESPI configurations.
  • Varied object illumination intensity, beam ratio, speckle size/shape, and fringe density.

Main Results:

  • Established a quantitative figure of merit for assessing deformation phase map quality in ESPI.
  • Demonstrated characteristic behaviors of temporal and spatial phase shifting methods.
  • Identified the influence of parameters like illumination intensity and fringe density on phase map quality.

Conclusions:

  • The study provides a quantitative framework for evaluating phase shifting methods in ESPI.
  • Understanding the impact of experimental parameters is key to optimizing deformation measurements.
  • This research contributes to improved accuracy and reliability in optical metrology applications.