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Updated: Jun 1, 2026

Methods for Measuring the Orientation and Rotation Rate of 3D-printed Particles in Turbulence
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3D shape measurement technique for multiple rapidly moving objects.

Yajun Wang1, Song Zhang, James H Oliver

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

Optics Express
|June 7, 2011
PubMed
Summary
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This study introduces a novel phase unwrapping strategy for ultrafast 3D shape measurement. It enables simultaneous measurement of multiple, rapidly moving objects by combining spatial unwrapping with gray codes.

Area of Science:

  • Optics and Photonics
  • Metrology
  • Computer Vision

Background:

  • Binary defocusing techniques enable ultrafast 3D shape measurement but are typically limited to single objects.
  • Simultaneous multi-object measurement requires advanced phase unwrapping, challenged by rapid motion and gray code precision.

Purpose of the Study:

  • To develop a new phase unwrapping strategy for simultaneous 3D shape measurement of multiple, rapidly moving objects.
  • To overcome motion-related challenges in gray code-based phase unwrapping.

Main Methods:

  • A novel phase unwrapping strategy combining conventional spatial phase unwrapping with gray codes.
  • Development of a high-speed (5,000 Hz) 3D shape measurement system.

Main Results:

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Related Experiment Videos

Last Updated: Jun 1, 2026

Methods for Measuring the Orientation and Rotation Rate of 3D-printed Particles in Turbulence
12:34

Methods for Measuring the Orientation and Rotation Rate of 3D-printed Particles in Turbulence

Published on: June 24, 2016

A Protocol for Real-time 3D Single Particle Tracking
10:16

A Protocol for Real-time 3D Single Particle Tracking

Published on: January 3, 2018

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
11:34

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

Published on: December 3, 2013

  • Successfully resolved motion-related phase unwrapping problems in high-speed scenarios.
  • Demonstrated the capability for simultaneous 3D shape measurement of multiple objects.

Conclusions:

  • The proposed technique effectively addresses limitations of existing binary defocusing methods for dynamic multi-object 3D measurement.
  • The developed system validates the performance of the novel phase unwrapping strategy at high speeds.