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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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A 3D Optical Surface Profilometer Using a Dual-Frequency Liquid Crystal-Based Dynamic Fringe Pattern Generator.

Kyung-Il Joo1, Mugeon Kim2, Min-Kyu Park3

  • 1School of Electronics Engineering, Kyungpook National University, Daegu 41566, Korea. kijoo@knu.ac.kr.

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|November 2, 2016
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Summary
This summary is machine-generated.

This study introduces a liquid crystal (LC)-based 3D optical surface profilometer. It uses dynamic fringe patterns to improve 3D depth extraction, overcoming phase ambiguity for enhanced surface profiling.

Keywords:
dynamic fringe pattern generatorinterferenceliquid crystaloptical surface profilometryphase modulation

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Area of Science:

  • Optics
  • Materials Science
  • Metrology

Background:

  • 3D optical surface profilometry is crucial for quality control and research.
  • Existing methods can suffer from optical phase ambiguity and limited resolution.
  • Dynamic fringe pattern generation offers potential for enhanced profilometry.

Purpose of the Study:

  • To develop a liquid crystal (LC)-based 3D optical surface profilometer.
  • To enhance 3D surface depth profile extraction by minimizing optical phase ambiguity.
  • To improve the speed and accuracy of 3D surface reconstruction.

Main Methods:

  • A dynamic fringe pattern generator (DFPG) utilizing liquid crystal modes (ECB and twisted nematic) was designed.
  • 16 interference patterns were generated using four-step phase shifting and spatial frequency variation.
  • Dual-frequency modulation of the driving waveform minimized DFPG switching time.
  • Depth profiles were reconstructed using discrete Fourier transform and geometric optical parameters.

Main Results:

  • The proposed LC-based DFPG successfully generated multiple fringe patterns for enhanced 3D profilometry.
  • Optical phase ambiguity was effectively avoided, leading to improved 3D depth extraction.
  • The system demonstrated efficient reconstruction of 3D object depth profiles.

Conclusions:

  • The liquid crystal-based 3D optical surface profilometer offers a viable solution for accurate and efficient 3D surface measurement.
  • The dynamic fringe pattern generation technique significantly enhances depth extraction capabilities.
  • This technology has potential applications in various fields requiring precise surface analysis.