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Three-dimensional phase step profilometry with a multicore optical fiber.

Ari Novack1, David D'Annunzio, Ekin Doğuş Cubuk

  • 1Department of Engineering, Swarthmore College, Swarthmore, Pennsylvania 19081, USA. arinovack@gmail.com

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Area of Science:

  • Optical engineering
  • Metrology
  • Image processing

Background:

  • Accurate depth profile measurement is crucial in various scientific and industrial fields.
  • Traditional methods like 2D Fourier transform profilometry can be computationally intensive.
  • Existing techniques may struggle with objects exhibiting high-frequency spatial variations.

Purpose of the Study:

  • To demonstrate a feasible method for calculating an object's depth profile.
  • To utilize phase stepping and multicore optical fiber technology for enhanced 3D surface measurement.
  • To offer a computationally efficient and accurate alternative for profilometry.

Main Methods:

  • Projecting an interference pattern onto an object using a multicore optical fiber.
  • Capturing the distorted interference pattern with a CCD camera.
  • Processing the captured pattern using the phase step interferometry method.

Main Results:

  • Successfully calculated the depth profile of an object.
  • The phase step method proved less computationally intensive than 2D Fourier transform profilometry.
  • Achieved higher accuracy in measuring objects with high-frequency spatial variations.

Conclusions:

  • Phase stepping combined with multicore optical fiber technology is a viable approach for depth profile calculation.
  • This method offers a practical and accurate solution for 3D surface metrology.
  • The technique is particularly advantageous for complex surfaces requiring high-resolution measurements.