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Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects
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Focus detection criterion for refocusing in multi-wavelength digital holography.

Li Xu1, Mike Mater, Jun Ni

  • 1Department of Mechanical Engineering, University of Michigan—Ann Arbor, 1210 HH Dow, 2300 Hayward Street, Ann Arbor, Michigan 48109, USA. xulium@umich.edu

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A new focus detection method uses phase contrast in multi-wavelength digital holography. This overcomes previous limitations, enabling accurate focus finding for applications like automotive surface inspection.

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Digital Imaging

Background:

  • Traditional focus detection relies heavily on amplitude contrast.
  • Phase contrast methods have been hindered by phase wrapping issues, limiting their use in focus finding.
  • Digital holography offers advanced imaging capabilities but requires robust focus detection.

Purpose of the Study:

  • To develop a novel focus detection criterion utilizing phase contrast.
  • To overcome the limitations of phase wrapping in phase contrast imaging for focus detection.
  • To demonstrate the feasibility of a new phase contrast-based focus detection method.

Main Methods:

  • Implementation of multi-wavelength digital holography.
  • Development of a new focus detection criterion based on phase contrast analysis.
  • Experimental validation of the proposed criterion.

Main Results:

  • The proposed phase contrast criterion effectively detects focus.
  • Experimental results confirm the feasibility and accuracy of the new method.
  • The technique successfully addresses phase wrapping challenges.

Conclusions:

  • A novel, feasible focus detection criterion based on phase contrast has been developed.
  • This method advances focus detection capabilities, particularly in digital holography.
  • Potential applications include high-precision surface inspection in industries like automotive manufacturing.