Differential dual-interference type closed loop fiber optic gyroscope based on birefringence modulation of wide frequency light source

Abstract

The invention discloses a differential dual-interference type closed loop fiber optic gyroscope based on birefringence modulation of a wide frequency light source. The differential dual-interference type closed loop fiber optic gyroscope comprises the light source, a first coupler, a second coupler, a first polarization beam splitter, a first modulator, a second modulator, a second polarization beam splitter, a fiber optic loop, a third polarization beam splitter, a first detector and a second detector. The differential dual-interference type closed loop fiber optic gyroscope has the advantages that closed loop control of the differential dual-interference type fiber optic gyroscope is realized; as the wide frequency light source with a very weak coherence characteristic is adopted, strong noise brought by various stray wave interference caused by a strong coherence characteristic of a laser light source is avoided; a SAGNAC effect is doubled; and the differential dual-interference type closed loop fiber optic gyroscope has a mature technical foundation and can satisfy a relatively high precision requirement.

Description

technical field [0001] The invention relates to a closed-loop differential double-interference optical fiber gyroscope which realizes SAGNAC effect multiplication and closed-loop control under the condition that the area of ​​the optical fiber ring and the length of the optical fiber are constant, and belongs to the technical field of optical fiber gyroscopes. Background technique [0002] As a new type of inertial angular velocity sensor that is developing extremely rapidly, fiber optic gyroscope has its unique technical and performance advantages, such as all-solid-state structure, high reliability, long life; fast start-up speed, short response time; large measurement range and wide dynamic range ; Anti-shock, vibration, chemical corrosion resistance; small size, light weight, low cost; suitable for mass production, etc., have been widely used in various fields. [0003] The commonly used form of fiber optic gyroscope in the world is the single interference type, that is,...

AI Technical Summary

Problems solved by technology

At present, the differential dual-interference fiber optic gyroscope adopts an open-loop scheme, and the phase difference between the light waves output by each interferometer is very large, so it is necessary to use a laser with good coherence characteristics as a light source to achieve the interference between these light waves. But this leads to interference between various spurious waves, so the open-loop differential dual-interferometric fiber optic gyroscope is noisy and difficult to suppress

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