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High-stability PGC demodulation technique with an additional sinusoidal modulation based on an auxiliary reference

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|October 14, 2022

Summary

This summary is machine-generated.

This study introduces an improved phase-generated carrier (PGC) technique using an auxiliary reference interferometer and ellipse fitting algorithm (EFA). This method enhances demodulation accuracy by compensating for optical path length differences and phase modulation shifts.

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Area of Science:

Optical Physics
Interferometry
Signal Processing

Background:

Reference interferometer demodulation schemes face challenges with identical optical path length differences (OPD) across interferometers.
Disparities in OPD lead to varying phase modulation depths, impacting demodulation accuracy.
Random shifts in phase modulation depth further degrade the reliability of demodulation results.

Purpose of the Study:

To propose an improved phase-generated carrier (PGC) technique for reference interferometer demodulation.
To address and overcome the limitations caused by differing OPDs and phase modulation depth shifts.
To enhance the accuracy and reliability of demodulation in optical interferometry.

Main Methods:

An auxiliary reference interferometer was integrated into the demodulation scheme.
The ellipse fitting algorithm (EFA) was employed for phase demodulation.
A sinusoidal signal was introduced as additional phase modulation to ensure accurate EFA fitting for small signals.

Main Results:

The proposed method effectively eliminates the impact of differing phase modulation depths caused by OPD variations.
Non-linear distortions arising from phase modulation depth shifts were successfully mitigated.
Experimental results confirmed the theoretical analysis, demonstrating improved demodulation accuracy.

Conclusions:

The combined reference interferometer and EFA approach enhances demodulation accuracy in optical interferometry.
The technique is robust against variations in optical path length difference and phase modulation depth.
This method expands the applicability of the ellipse fitting algorithm in reference interferometer phase demodulation.