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Analysis of dead zone sources in a closed-loop fiber optic gyroscope
Applied Optics
|February 3, 2016
Summary
This study analyzes fiber optic gyroscope dead zones, identifying electrical cross-coupling and phase modulation drift as key causes. Understanding these factors improves gyroscope accuracy and performance.
Area of Science:
- Optical Engineering
- Inertial Navigation Systems
Background:
- The dead zone in closed-loop fiber optic gyroscopes (FOGs) prevents rotation detection, leading to zero bias.
- Understanding dead zone origins is crucial for enhancing FOG performance and reliability.
Purpose of the Study:
- To analyze the primary sources of dead zone in closed-loop fiber optic gyroscopes.
- To differentiate and model the effects of electrical cross-coupling and phase modulation drift.
Main Methods:
- Simulations were conducted to model dead zone sources.
- Experimental analysis was performed to validate simulation findings.
- Both open-loop and closed-loop FOG modes were analyzed.
Main Results:
- Electrical cross-coupling, caused by modulation voltage and photodetector interference, is a significant dead zone contributor.
- Phase modulation drift, stemming from electrode contamination or substrate effects, also induces dead zone.
- Simulations and experiments clearly identified and analyzed these dead zone sources.
Conclusions:
- Electrical cross-coupling and phase modulation drift are the principal causes of dead zones in FOGs.
- Accurate modeling and analysis of these phenomena are essential for mitigating dead zone effects.
- This research provides a clearer understanding for improving FOG accuracy and operational integrity.
