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The difference between fiber optic gyroscope and laser gyroscope
Sep 05,2025
The core difference between fiber optic gyroscope and laser gyroscope lies in their working principle, core structure, and performance characteristics, which are suitable for different precision requirements and application scenarios.
Working principle and structural differences
Fiber Optic Gyroscope (FOG)
Based on the principle of passive ring interferometer, the Sagnac effect is enhanced using multi turn fiber optic coils, and the angular velocity is calculated by detecting the phase difference between two backward propagating light beams.
Main components: fiber optic coil (several hundred meters to several kilometers), broadband light source (such as SLD), coupler, and photodetector.
Laser Gyroscope (RLG)
Based on the principle of active ring laser resonant cavity, the laser is excited by gas discharge, and the angular velocity is measured using the frequency difference (Sagnac shift) between two backward propagating light beams.
Main components: annular laser cavity (including high reflection mirror), gas discharge tube, and frequency detection system, requiring mechanical jitter compensation for blocking effect.
Core performance comparison
Accuracy: Laser gyroscopes have higher accuracy (strategic navigation), while fiber optic gyroscopes are suitable for tactical to navigation levels.
Start time: Fiber optic gyroscope starts instantly, laser gyroscope needs to be preheated for 1-5 minutes.
Impact resistance: The all solid state structure of fiber optic gyroscope has excellent impact resistance, while laser gyroscope is susceptible to vibration due to the sensitivity of the reflection mirror.
Cost and lifespan: Fiber optic gyroscopes have low cost (mass production advantage) and long lifespan (>100000 hours), while laser gyroscopes have high processing costs and may have aging gas packaging.
Differences in application scenarios
Fiber optic gyroscope: medium precision demand scenarios such as drones, automotive ADAS, robot navigation, industrial stabilization platforms, etc.
Laser gyroscope: high-precision scenarios such as aerospace inertial navigation and strategic weapon guidance.
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