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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Superfast multifrequency phase-shifting technique with optimal pulse width modulation.

Yajun Wang1, Song Zhang

  • 1Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, USA.

Optics Express
|March 30, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces an optimal pulse width modulation (OPWM) technique to generate high-quality sinusoidal fringe patterns for high-speed 3D shape measurement. This enables a multifrequency phase-shifting algorithm for simultaneous measurement of multiple objects.

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Area of Science:

  • Optics and Photonics
  • Computer Vision
  • Metrology

Background:

  • High-speed 3D shape measurement is crucial for various industrial applications.
  • Generating high-quality sinusoidal fringe patterns is essential for accurate phase-shifting algorithms.
  • Existing methods struggle to simultaneously produce sinusoidal patterns with different periods for multifrequency phase-shifting (MFPS).

Purpose of the Study:

  • To propose and validate a novel method for realizing an MFPS algorithm for high-speed 3D shape measurement.
  • To overcome the challenge of simultaneously generating high-quality sinusoidal fringe patterns with different periods.
  • To develop a system capable of simultaneously measuring multiple objects.

Main Methods:

  • Utilizing an optimal pulse width modulation (OPWM) technique to generate sinusoidal fringe patterns.
  • Selectively eliminating high-order harmonics from squared binary patterns.
  • Implementing a three-frequency algorithm for simultaneous multifrequency phase-shifting.

Main Results:

  • Successfully generated high-quality sinusoidal fringe patterns with different periods.
  • Enabled the realization of an MFPS algorithm.
  • Developed a 556 Hz system for simultaneous measurement of multiple objects.

Conclusions:

  • The OPWM technique effectively addresses the limitations of previous methods for generating fringe patterns.
  • The developed system offers a significant advancement in high-speed, multi-object 3D shape measurement.
  • This approach enhances the feasibility and accuracy of MFPS algorithms in practical applications.