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Single-shot deflectometry for dynamic 3D surface profile measurement by modified spatial-carrier frequency

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We introduce single-shot deflectometry for rapid 3D surface profiling using a single pattern. This method accurately measures surface shapes in real-time, even with vibrations.

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Area of Science:

  • Optical Metrology
  • Surface Profilometry
  • 3D Measurement Techniques

Background:

  • Traditional deflectometry methods often require multiple images, limiting real-time applications.
  • Accurate phase retrieval from single-frame patterns is challenging due to variations in lighting and surface properties.

Purpose of the Study:

  • To develop a novel single-shot deflectometry technique for real-time 3D surface profile measurement.
  • To enhance phase extraction accuracy from a single composite pattern for improved measurement precision.

Main Methods:

  • A single composite pattern is employed for deflectometry.
  • Fourier Transform (FT) and spatial carrier-frequency phase-shifting (SCPS) techniques are adapted for single-frame phase retrieval.
  • Lissajous figure and ellipse fitting are used to correct phase extraction errors caused by background and modulation variations.

Main Results:

  • The proposed single-shot deflectometry technique achieves real-time 3D surface profiling.
  • Measurement results show a maximum difference of less than 30 nm RMS compared to traditional phase-shifting deflectometry.
  • The technique demonstrates robustness to vibrations and capability for dynamic object measurement.

Conclusions:

  • The developed single-shot deflectometry offers a viable solution for fast and accurate 3D surface measurements.
  • The adapted FT and SCPS methods, combined with ellipse fitting, effectively improve phase extraction accuracy.
  • This technique holds potential for applications requiring real-time surface inspection and analysis.