Fast and precise single-frame phase demodulation interferometry

Area of Science:

• Optical Metrology
• Interferometry
• Signal Processing

Background:

• Real-time phase detection is critical for dynamic measurements in various scientific and engineering fields.
• Traditional phase-shifting interferometry methods can be time-consuming and computationally intensive.
• Developing efficient single-frame phase demodulation algorithms remains a significant challenge.

Purpose of the Study:

• To present a novel, fast, and precise spatial carrier phase-shifting interferometry method for real-time phase detection.
• To utilize the dynamic mode decomposition strategy for accurate phase measurement from a single interferogram.
• To analyze the performance and robustness of the proposed method under various influencing factors.

Main Methods:

• Generation of phase-shifted sub-interferograms from a spatial carrier interferogram.
• Application of dynamic mode decomposition (DMD), a non-iterative algorithm, for phase extraction.
• Numerical simulations and experimental validation to assess the method's accuracy and efficiency.
• Performance analysis considering factors like noise level, carrier frequency, and direction.

Main Results:

• The proposed method achieves fast and accurate phase demodulation from a single interferogram.
• Dynamic Mode Decomposition effectively extracts phase information without iterative processes.
• The algorithm demonstrates robustness against varying levels of random noise and carrier frequency parameters.
• Experimental results confirm the efficiency and precision of the single-frame phase measurement technique.

Conclusions:

• The developed spatial carrier phase-shifting interferometry combined with DMD offers an efficient and accurate solution for dynamic real-time phase measurement.
• This non-iterative, single-frame approach overcomes limitations of traditional methods.
• The technique provides a valuable tool for applications requiring rapid and precise phase detection.