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Four-step spatial phase-shifting shearing interferometry from moiré configuration by triple gratings
Yang Song1, Yunyun Chen, Jia Wang
1Department of Information Physics & Engineering, Nanking University of Science & Technology, Nanking 210094, China. sy0204@mail.njust.edu.cn
Optics Letters
|June 5, 2012
Summary
A novel spatial phase-shifting shearing interferometry using three Ronchi gratings is introduced. This method simultaneously captures four phase-shifted shearing interferograms for accurate phase extraction, demonstrated on a propane flame.
Area of Science:
- Optical Engineering
- Interferometry
- Phase Measurement
Background:
- Traditional interferometry methods can be complex.
- Accurate phase extraction is crucial for optical metrology.
- Shearing interferometry offers advantages in simplicity.
Purpose of the Study:
- To present a new spatial phase-shifting shearing interferometry.
- To demonstrate its capability for phase extraction.
- To analyze its performance and potential errors.
Main Methods:
- Utilizing a simple optical setup with three Ronchi gratings.
- Simultaneously acquiring four phase-shifted shearing interferograms.
- Applying a four-step spatial phase-shifting algorithm for phase retrieval.
Main Results:
- Successful extraction of phase projection from a propane flame.
- Explicit intensity distributions of shearing interferograms were derived.
- Mathematical error analysis was performed.
Conclusions:
- The proposed spatial phase-shifting shearing interferometry is simple and effective.
- It enables simultaneous acquisition of phase-shifted data.
- The method is suitable for analyzing dynamic phase objects like flames.
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