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Analysis of the synchronous phase-shifting method in a white-light spectral interferometer
Applied Optics
|May 14, 2020
Summary
Synchronous phase-shifting in white-light spectral interferometry offers accurate, low-noise measurements for high-speed applications. This study demonstrates its effectiveness for precise absolute distance determination.
Area of Science:
- Optics and Photonics
- Metrology
- Interferometry
Background:
- Traditional white-light spectral interferometry often uses Fourier transform or temporal phase-shifting methods for phase retrieval.
- These methods can be limited in accuracy and susceptible to noise, hindering real-time applications.
Purpose of the Study:
- To develop and evaluate a white-light spectral interferometer utilizing synchronous phase shifting for enhanced measurement accuracy.
- To investigate the feasibility of this system for online and ultrahigh-speed measurement applications in precision industries.
Main Methods:
- Construction of a white-light spectral interferometer based on polarization interference.
- Implementation of a two-step phase-shifting algorithm for synchronous phase information retrieval.
- Simulation of spectral interferometric signals to analyze the impact of intensity, envelope shape, noise, and phase-shift errors on distance measurements.
Main Results:
- Simulations demonstrated the influence of signal variations and errors on absolute distance measurement accuracy.
- Experimental measurements confirmed the high accuracy of the developed synchronous phase-shifting system.
- The system proved suitable for precise absolute distance determination.
Conclusions:
- Synchronous phase-shifting provides a robust method for accurate phase retrieval in white-light spectral interferometry.
- The developed system shows significant potential for online and high-speed metrology in precision engineering.
- This technique advances the capabilities of spectral interferometry for demanding industrial applications.
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