Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Fringe pattern demodulation with a two-frame digital phase-locked loop algorithm.

Munther A Gdeisat1, David R Burton, Michael J Lalor

  • 1Coherent and Electro-Optics Research Group, School of Engineering, Liverpool John Moores University, United Kingdom. gdeisat@hotmail.com

Applied Optics
|September 13, 2002
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

The use of abrasive polishing and laser processing for developing polyurethane surfaces for controlling fibroblast cell behaviour.

Materials science & engineering. C, Materials for biological applications·2016
Same author

The effects of acoustic vibration on fibroblast cell migration.

Materials science & engineering. C, Materials for biological applications·2016
Same author

A Robust and Simple Measure for Quality-Guided 2D Phase Unwrapping Algorithms.

IEEE transactions on image processing : a publication of the IEEE Signal Processing Society·2016
Same author

Aiding phase unwrapping by increasing the number of residues in two-dimensional wrapped-phase distributions.

Applied optics·2016
Same author

Analysis of dynamic cantilever behavior in tapping mode atomic force microscopy.

Microscopy research and technique·2015
Same author

Actin bundling and polymerisation properties of eukaryotic elongation factor 1 alpha (eEF1A), histone H2A-H2B and lysozyme in vitro.

Journal of structural biology·2011
Same journal

Multifunctional reconfigurable terahertz metasurface based on vanadium dioxide phase transition: achieving broadband absorption and efficient polarization conversion.

Applied optics·2026
Same journal

High-Q-factor electromagnetically induced transparency utilizing quasi-bound states in the continuum in an all-dielectric terahertz metasurface.

Applied optics·2026
Same journal

Automated stitching interferometry for high-precision metrology of X-ray mirrors.

Applied optics·2026
Same journal

Experimental demonstration of an approach to designing a metal-dielectric DBR resonant cavity structure.

Applied optics·2026
Same journal

High-precision wavefront reconstruction from a single-shot interferogram using a physics-driven hybrid feature calibration network.

Applied optics·2026
Same journal

Ultra-high-Q Fano resonance based on coupled topological corner states in Kagome photonic crystals.

Applied optics·2026
See all related articles

A new digital phase-locked loop technique accurately demodulates fringe patterns for noncontact measurements. This method excels with rapidly changing surfaces, surpassing Fourier fringe analysis despite producing noisier phase maps.

Area of Science:

  • Optical Metrology
  • Image Processing
  • Phase Measurement

Background:

  • Fringe pattern analysis is crucial for noncontact measurements.
  • Existing methods like Fourier fringe analysis have limitations with dynamic surfaces.

Purpose of the Study:

  • To introduce a novel two-frame digital phase-locked loop (DPLL) technique for fringe pattern demodulation.
  • To evaluate the DPLL technique's performance against Fourier fringe analysis for dynamic object measurement.

Main Methods:

  • Acquiring two fringe patterns of an object at different spatial carrier frequencies.
  • Employing a DPLL algorithm to track and demodulate phase differences using wrapped phase components as reference.
  • Extracting desired phase information from the demodulated phase difference.

Related Experiment Videos

Main Results:

  • Experimental validation using real fringe patterns confirmed the technique's feasibility.
  • The DPLL method demonstrated superior performance for objects with rapid surface variations compared to Fourier fringe analysis.
  • Phase maps generated by the DPLL technique exhibited higher noise levels than those from Fourier fringe analysis.

Conclusions:

  • The two-frame DPLL technique is a viable method for fringe pattern demodulation.
  • This technique is particularly suitable for noncontact measurement of objects exhibiting rapid surface changes.
  • While effective for dynamic measurements, the trade-off involves increased noise in the resulting phase maps.