Differential fiber-optic gyroscope based on temperature drift suppression characteristic of double-core optical fiber
A temperature drift, dual-core fiber technology, applied in Sagnac effect gyroscopes, gyroscopes/steering sensing devices, measurement devices, etc., can solve problems such as mutual interference and affecting gyroscope performance
Active Publication Date: 2021-05-14
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 will be described in detail below in conjunction with the accompanying drawings and specific embodiments, and implemented on the premise of the technical solution of the present invention, but the protection scope of the present invention is not limited to the following embodiments.
[0015] Such as figure 1 , a differential fiber optic gyro based on dual-core optical fiber suppression temperature drift characteristics, specifically including a first light source 1 with a wavelength of 1530nm, a second light source 2 with a wavelength of 1560nm, a first optical coupler 3, a second optical coupler 4, The first Y-shaped multifunctional integrated optical device 5, the second Y-shaped multifunctional integrated optical device 6, the first fan-in and fan-out module 7, the second fan-in and fan-out module 8, the double-core optical fiber ring 9, the first light detection device 10, a second photodetector 11, and a digital signal acquisition and processi...
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Abstract
The invention discloses a differential fiber-optic gyroscope based on a temperature drift suppression characteristic of a double-core optical fiber. The main structure comprises 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 and processing circuit board. Light emitted by the two light sources passes through the optical couplers and the Y-shaped multifunctional integrated optical device in respective optical paths, is guided into two different fiber cores in the double-core optical fiber ring by the fan-in and fan-out module respectively and finally independently interferes, so that the realization of two fiber-optic gyroscopes with the same time-varying temperature disturbance is equivalent. Environment noise can be effectively suppressed by performing synchronous detection and differential processing on interference signals. The gyroscope can significantly inhibit the influence of environmental disturbance on the precision of the fiber-optic gyroscope, basically eliminate errors caused by temperature effect and the like, and obtain the accurate angular velocity information of the carrier.
Description
technical field [0001] The invention relates to the technical field of fiber optic gyroscopes, in particular to a differential fiber optic gyroscope based on the temperature drift suppression characteristic of dual-core optical fibers. Background technique [0002] Fiber optic gyroscope is one of the most important achievements in the field of fiber optic sensing. Due to its advantages of small size, light weight, large dynamic range and high sensitivity, it 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. These factors will lead to the deterioration of measurement accuracy. [0003] Usually the temperature effect has the greatest influence on the gyroscope. In engineering applications, in order to improve the sensitivity of fiber optic gyroscopes, hundreds of meters to several ki...
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Login to View More 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