A Differential Fiber Optic Gyroscope Based on Dual-Core Optical Fiber Suppressing Temperature Drift
A technology of temperature drift and dual-core optical fiber, applied in Sagnac effect gyroscopes, gyroscopes/steering sensing equipment, instruments, etc., can solve problems such as mutual interference and affecting gyroscope performance, achieve performance improvement, and suppress temperature effects Effect
Active Publication Date: 2022-05-27
ZHEJIANG UNIV
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Problems solved by technology
However, for beams of different wavelengths, if the wavelength difference is small, mutual interference may occur in the optical path, and when the wavelength difference is large, it is difficult to transmit the two kinds of light with high quality at the same time because the optical devices have their own specific operating wavelengths. Finally affected the improvement of gyroscope performance
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[0014] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments, to the premise of the technical solution of the present invention, but the scope of protection of the present invention is not limited to the following embodiments.
[0015] as Figure 1 A differential optical fiber gyroscope based on the characteristics of two-core optical fiber suppression temperature drift, specifically comprising a first light source with a wavelength of 1530 nm 1, a second light source with a wavelength of 1560 nm 2, a first optocoupler 3, a second optocoupler 4, a first Y-type multifunctional integrated optics 5, a second Y-type multifunctional integrated optics 6, a first in-fan-out module 7, a second-sector in-fan-out module 8, a dual-core fiber ring 9, a first light detector 10, a second light detector 11, and a digital signal acquisition and processing circuit board 12.
[0016] The optical path connection method and beam trans...
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The invention discloses a differential optical fiber gyroscope based on the temperature drift suppression characteristic of a double-core optical fiber. The main structure includes two light sources with different wavelengths, two optical couplers, two Y-shaped multifunctional integrated optical devices, two fan-in and fan-out modules, a double-core optical fiber ring, two optical detectors, and a digital signal acquisition Handle the circuit board. The light emitted by the two light sources passes through the optical coupler and Y-shaped multifunctional integrated optical device in their respective optical paths, and is guided by the fan-in and fan-out module to two different cores in the double-core fiber ring, and finally interferes independently , which is equivalent to realizing two fiber optic gyroscopes with the same time-varying temperature disturbance, and the environmental noise can be effectively suppressed by synchronous detection and differential processing of the interference signal. The invention can significantly suppress the influence of environmental disturbance on the precision of the fiber optic gyroscope, basically eliminate errors caused by temperature effects and the like, and obtain accurate angular velocity information of the carrier.
Description
Technical field [0001] The present invention relates to the field of optical fiber gyroscope technology, specifically a differential optical fiber gyroscope based on the characteristics of two-core optical fiber suppression temperature drift. Background [0002] Fiber optic gyroscope is one of the most important achievements in the field of optical fiber sensing, because it has the advantages of small size, light weight, large dynamic range and high sensitivity, and plays an important role in inertial navigation systems. In addition to its own accuracy, the performance of the fiber optic gyroscope is also affected by the surrounding environment such as radiation, magnetic field, vibration, temperature, etc., which will lead to the deterioration of measurement accuracy. [0003] Usually the temperature effect has the greatest impact on the gyroscope. In order to improve the sensitivity of the optical fiber gyroscope in engineering applications, hundreds of meters to several kilome...
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IPC IPC(8): G01C19/72
CPCG01C19/721
Inventor 缪立军石锦闫景涛黄腾超车双良舒晓武
Owner ZHEJIANG UNIV