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Phase sensitivity evaluation and its application to phase shifting interferometry.

Shichao Chen1, Yizheng Zhu1

  • 1The Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061, USA.

Methods (San Diego, Calif.)
|January 7, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a method to evaluate the sensitivity of phase shifting interferometry, a key metric in quantitative phase imaging. It provides a framework for comparing different techniques and optimizing system performance under shot noise limitations.

Keywords:
Energy efficiencyPhase shifting interferometrySensitivity evaluationShot noise-limited modelSystem optimization

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Area of Science:

  • Quantitative Phase Imaging
  • Optical Metrology

Background:

  • Sensitivity is crucial for reproducibility in quantitative phase imaging (QPI).
  • Existing theoretical studies on sensitivity constraints and inter-technique comparisons are insufficient.
  • Phase shifting interferometry (PSI) is a major QPI technique requiring robust sensitivity evaluation.

Purpose of the Study:

  • To introduce a comprehensive method for evaluating the sensitivity of phase shifting interferometry.
  • To establish a theoretical framework for comparing different PSI techniques.
  • To guide algorithm optimization and improve energy efficiency in QPI systems.

Main Methods:

  • Development of a three-level evaluation framework for sensitivity.
  • Construction of a complete interference signal model.
  • Application of Cramér-Rao bound analysis for algorithm and system efficiencies, focusing on shot noise-limited conditions.

Main Results:

  • A detailed methodology for sensitivity evaluation in PSI is presented.
  • Theoretical sensitivities are calculated using a shot noise-limited model, enabling performance assessment.
  • Comparisons of common PSI techniques reveal insights into optimization and energy efficiency.

Conclusions:

  • The proposed method provides a standardized approach to assess and compare PSI sensitivity.
  • The study offers practical tools, including a normalized algorithm sensitivity table, for experimentalists.
  • This work facilitates advancements in QPI by addressing theoretical limitations in sensitivity analysis.