A Digital Closed-Loop Fiber Optic Gyroscope with Dual Interferometer System

Abstract

The invention discloses a digital closed loop optical fiber gyroscope with a double-interferometer system. The digital closed loop optical fiber gyroscope comprises a light source driver, a light source, a third beam splitter, a first angular speed sensing module, a second angular speed sensing module, an optical fiber ring and a logic circuit, wherein light emitted by the light source is divided into two beams of incident light after passing through the third beam splitter, and the two beams of incident light respectively enter the first angular speed sensing module and the second angular speed sensing module; the two modules uses the same optical fiber ring, so that two different interferometers are formed in the polarization maintaining optical fiber ring and respectively output signals; the logic circuit receives the signals and performs differential calculation to obtain speed information sensed by the interferometers. The digital closed loop optical fiber gyroscope disclosed by the invention controls a polarization state through a polarization beam splitting / combing device through the same polarization maintaining optical fiber ring, so that the two interferometers in different polarization states are formed in the optical fiber ring; the two polarization states are separated, so that the light-based double-polarization double-interferometer system is implemented, and the precision of the digital closed loop optical fiber gyroscope can be obviously improved, and the intensity noise of the light source is suppressed.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a digital closed-loop fiber optic gyroscope with a double interferometer system. Background technique [0002] Fiber optic gyroscope is a new type of solid-state inertial instrument combined with inertial technology, optoelectronic technology and modern manufacturing technology. It is currently the only silent gyroscope that can cover high, medium and low precision. Fiber optic gyroscope is a new generation of angular rate and angular displacement sensors, used for navigation and attitude control in satellites, aircraft, missiles, ships, vehicles, surveying and exploration, robots and other fields. It is the third generation of gyroscopes after electromechanical gyroscopes and laser gyroscopes . It has the characteristics of simple structure, low cost, quick start (zero start can be realized), high reliability, strong shock and vibration resistance, and long service life...

AI Technical Summary

Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a digital closed-loop fiber optic gyroscope with a dual interferometer system to solve the problems of insufficient precision or relatively large errors in existing fiber optic gyroscopes

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