How Fiber Optic Gyro Finds True North!

Discover how Fiber Optic Gyros (FOG) and Ring Laser Gyros (RLG) sense Earth’s rotation to find True North. Learn the Sagnac effect, gyrocompass basics, and why FOG rules offshore surveys. This video explains the working principles of fiber optic gyroscopes (FOG) and ring laser gyroscopes (RLG). It illustrates how these devices measure angular velocity and determine heading using diagrams of Earth's rotation and optical components. The presenter concludes that FOGs are superior for offshore hydrographic surveys due to their excellent heading, reliability, and lower cost compared to RLGs, leveraging the principles of physics and angular momentum. We’ll explore the Sagnac effect, the difference between phase shift and frequency shift, and why FOG has become the industry standard for offshore surveys — no lock‑in, no moving parts, and perfect integration with INS, DP, Multibeam, and USBL systems. #FiberOpticGyro #RingLaserGyro #Gyrocompass #SagnacEffect #MarineSurvey #Hydrography #NavigationScience #TrueNorth #InertialNavigation #OceanSurvey #FOGvsRLG #EngineeringExplained #SurveyingTech #AvijitExplains #ScienceSimplified Chapters in this video: 0:00 – Introduction 0:23 – What is a Fiber Optic Gyro (FOG)? 1:37– The Sagnac Effect Explained 2:25 – Finding True North 4:14 – FOG vs RLG 4:56 – The Lock‑In Problem 6:49 – Why FOG Wins Offshore 7:33 – Conclusion & Next Video Support my channel → https://buymeacoffee.com/jaom Join this channel to get access to exclusive offshore survey videos: https://www.youtube.com/channel/UCPOK6Z0d2YRd46aqcrXxupA/join