Device and method for improving stability of fiber-optic gyroscope

A fiber optic gyroscope and stability technology, which is applied in measurement devices, Sagnac effect gyroscopes, gyroscopes/steering sensing devices, etc., can solve problems such as large bias errors, and achieve low-noise scale factor stability, Effects of high center wavelength stability, superior scale factor stability

Inactive Publication Date: 2021-05-14
ZHEJIANG UNIV
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Problems solved by technology

Shupe effect will produce large bias error in fiber optic gyroscope and limit its application

Method used

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  • Device and method for improving stability of fiber-optic gyroscope

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Embodiment Construction

[0015] 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.

[0016] Such as figure 1 , a device for improving the stability of a fiber optic gyroscope, comprising a first semiconductor laser 1, a second semiconductor laser 2, a first wavelength division multiplexer 3, an electro-optical phase modulator 4, an amplifier circuit 5, a noise source 6, an optical coupler 7. Y-type multifunctional integrated optical device 8, polarization maintaining fiber ring 9, second wavelength division multiplexer 10, first photodetector 11, second photodetector 12, first analog-to-digital converter 13, second Analog-to-digital converter 14, digital signal processing unit 15, digital-to-analog converter 16;

[0017] The light emitted by the two ...

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Abstract

The invention discloses a device and a method for improving the stability of an optical fiber gyroscope, and belongs to the technical field of optical fiber sensing. After two lasers with different wavelengths are combined, a spectrum is broadened synchronously through an external phase modulation technology, modulated light enters a Y-shaped multifunctional integrated optical device through a coupler and is divided into two beams to be output, the two beams of light are transmitted in a polarization maintaining optical fiber ring in the clockwise direction and the anticlockwise direction respectively, and finally the two beams of light are combined into one beam again and interfere with each other. Two wave crests in interference optical signals are separated, two photoelectric detectors are used for synchronous detection to convert the optical signals into electric signals, a digital signal processing unit demodulates carrier rotation angular velocity information corresponding to the two electric signals, and the carrier rotation angular velocity information is output after the influence of environmental factors is eliminated through differential processing. Compared with a traditional fiber-optic gyroscope using a single wide-spectrum light source, the fiber-optic gyroscope provided by the invention has the advantages that the influence of temperature disturbance and the like on the precision of the gyroscope can be remarkably reduced, the noise is low, the scale factor stability is high, and a high-performance fiber-optic gyroscope can be formed.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a device and method for improving the stability of an optical fiber gyroscope. Background technique [0002] As an important achievement in the field of fiber optic sensing, the fiber optic gyroscope has the characteristics of all solid state, low cost, high theoretical accuracy, and high reliability. Control systems, navigation and land positioning systems, robot attitude control and stabilization devices, etc. With the expansion of the application field of fiber optic gyroscopes, complex environments and long working hours have put forward higher requirements for the performance of fiber optic gyroscopes. [0003] 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. The non-reciprocal phase shift caused by these factors will be included i...

Claims

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Application Information

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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
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