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High-speed phase imaging by parallel phase-shifting digital holography.

Takashi Kakue1, Ryosuke Yonesaka, Tatsuki Tahara

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Area of Science:

  • Optical Engineering
  • Fluid Dynamics
  • Holography

Background:

  • Phase-shifting interferometry is crucial for 3D measurements.
  • High-speed imaging of dynamic fluid phenomena remains challenging.

Purpose of the Study:

  • To demonstrate high-speed parallel phase-shifting digital holography.
  • To visualize dynamic phase variations in compressed gas flow.

Main Methods:

  • Utilized space-division multiplexing for parallel hologram acquisition.
  • Employed high-speed parallel phase-shifting digital holography.
  • Reconstructed 3D information from recorded holograms.

Main Results:

  • Successfully captured phase variations of air from a compressed gas jet.
  • Observed and documented periodic phase distributions within the gas flow.
  • Achieved high-speed imaging at 20,000 and 180,000 frames per second.

Conclusions:

  • High-speed parallel phase-shifting digital holography enables accurate 3D analysis of dynamic events.
  • The technique revealed novel insights into gas flow dynamics, including periodic structures.