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Related Experiment Video

Updated: Nov 23, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Absolute phase retrieval for colored objects based on three phase-shifting amount codes.

Han Yuan, HongRu Li, GuoYing Feng

|December 31, 2020

Summary

This summary is machine-generated.

This study introduces three phase-shifting amount codes (3-PSA-codes) for absolute phase retrieval. This novel method effectively measures colored objects using just one additional pattern, enhancing accuracy.

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Area of Science:

Optical Metrology
Phase Measurement Techniques

Background:

Absolute phase retrieval is crucial for 3D surface profiling.
Colored objects pose challenges for traditional phase retrieval methods due to surface reflectivity variations.
Existing temporal methods often require multiple patterns, increasing complexity and time.

Purpose of the Study:

To develop a robust absolute phase retrieval method for colored objects.
To reduce the number of patterns required for accurate phase measurement.
To overcome the limitations of surface color effects in phase retrieval.

Main Methods:

Introduction of three phase-shifting amount codes (3-PSA-codes) based on 3-digit-code concepts.
Embedding code elements into the phase-shifting amount (PSA) domain for retrieval from phase differences.
Utilizing fringe patterns of wrapped phase for efficient code element determination.
Employing a single additional pattern for absolute phase retrieval.

Main Results:

Successfully retrieved absolute phase information from colored objects with a single additional pattern.
Demonstrated the effectiveness of 3-PSA-codes in overcoming surface color interference.
Experimental results confirmed the robustness of the proposed method.

Conclusions:

The proposed 3-PSA-codes offer a significant advancement in absolute phase retrieval for challenging surfaces.
This method simplifies the measurement process by reducing pattern requirements.
The technique shows strong potential for applications involving colored object metrology.