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Noise Analysis of a Passive Resonant Laser Gyroscope
Kui Liu1, Fenglei Zhang1, Zongyang Li1
1MOE Key Laboratory of Fundamental Physical Quantities Measurements & Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
Sensors (Basel, Switzerland)
|September 23, 2020
Summary
This study analyzes limitations in passive resonant laser gyroscopes (PRG) for measuring Earth
Area of Science:
- Geophysics
- Optical Engineering
- Metrology
Background:
- Large-scale laser gyroscopes measure Earth's rotation without external references.
- High-accuracy measurement is crucial for determining Earth orientation parameters (EOP).
Purpose of the Study:
- Investigate limitations in a passive resonant laser gyroscope (PRG).
- Identify noise sources to improve measurement accuracy for EOP determination.
Main Methods:
- Derived noise transfer function of the PRG.
- Analyzed frequency-dependent noise contributions.
Main Results:
- Free-spectral-range (FSR) variation due to cavity length drift limits performance below 10⁻² Hz.
- Frequency discrimination noise, including residual amplitude modulation (RAM), limits performance between 10⁻² and 10³ Hz.
- Mach-Zehnder beam combiner noise affects measurements between 0.01 and 2 Hz.
Conclusions:
- Identified key noise sources limiting PRG accuracy.
- Provided insights for future improvements in laser gyroscope technology for geophysics.
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