Resonant Fiber Optic Gyroscope Based on Coherence Effect of Double-Coupled Fiber Ring Resonator

Abstract

The invention belongs to the technical field of fiber optic gyroscopes and especially relates to a double-coupling optical fiber ring resonator coherent effect-based resonant fiber optic gyroscope. The double-coupling optical fiber ring resonator coherent effect-based resonant fiber optic gyroscope solves the problem that the traditional resonant fiber optic gyroscope has low sensitivity and does not satisfy high sensitivity requirements of commercial airplanes, spatial orientation and navigation. The double-coupling optical fiber ring resonator coherent effect-based resonant fiber optic gyroscope comprises a laser, a polarization controller, a lithium niobate phase modulator, a first optical fiber coupler, a first optical fiber ring resonator, a second optical fiber coupler, a second optical fiber ring resonator, a third optical fiber coupler, a detector, and a signal processing and feedback system. The two optical fiber ring resonators prepared respectively from two optical fibers having different length are coupled and produce coherent effects and through measurement of a change of coherent resonant frequency of the two optical fiber ring resonators, a rate of angular motion is obtained. Compared with the traditional resonant fiber optic gyroscope having the same resonant optical fiber length, the double-coupling optical fiber ring resonator coherent effect-based resonant fiber optic gyroscope has sensitivity improved by dozens of times.

Description

technical field [0001] The invention belongs to the technical field of fiber optic gyroscopes, and specifically relates to a dual-coupled fiber optic ring resonator that overcomes the low sensitivity of traditional resonant fiber optic gyroscopes and cannot meet the needs of high-sensitivity occasions such as commercial aircraft, space positioning and navigation. Resonant fiber optic gyroscope with coherent effect. Background technique [0002] In 1976, V.Vali and R.W.Shorthill of the University of Utah in the United States successfully developed the first fiber optic gyroscope. As soon as the fiber optic gyroscope came out, it attracted worldwide attention due to its advantages such as large dynamic range, long life, low power consumption, and small size. Universities and scientific research institutions in many countries have paid attention to it and made rapid progress. At present, a fiber optic ring resonator is used in the traditional resonant fiber optic gyroscope. Wh...

AI Technical Summary

Problems solved by technology

At present, a fiber optic ring resonator is used in the traditional resonant fiber optic gyroscope. When the gyroscope rotates, the resonant frequency of the fiber optic ring resonator will change with the rotational angular velocity, so by detecting the change of the fiber optic ring resonant frequency, we can Measure the rotational angular velocity, but its sensitivity is low, which cannot meet the attitude alignment of commercial aircraft, especially the needs of occasions with high sensitivity requirements such as space positioning and navigation

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