A Closed-loop Control System of Small Fiber Optic Gyroscope

A fiber optic gyroscope and closed-loop control technology, which is applied in Sagnac effect gyroscopes, gyroscopes/steering sensing devices, instruments, etc., can solve the problems of reducing the volume of closed-loop control systems, unable to use small fiber optic gyroscopes, etc., to reduce complexity high degree of stability, strong anti-common mode interference, the effect of reducing the volume

Active Publication Date: 2022-06-17
HEBEI HANGUANG HEAVY IND
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Problems solved by technology

[0012] In view of this, the present invention provides a closed-loop control system for a small fiber optic gyroscope, which can reduce the volume of the closed-loop control system and overcome the shortcomings that traditional closed-loop control systems cannot be applied to small fiber optic gyroscopes.

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  • A Closed-loop Control System of Small Fiber Optic Gyroscope
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  • A Closed-loop Control System of Small Fiber Optic Gyroscope

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Embodiment Construction

[0038] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0039] The invention provides a closed-loop control system of a small fiber optic gyro. , D / A converter B these two devices.

[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. like figure 2 As shown, the present invention includes an optical fiber ring, a Y-wave guide, a coupler, a detector, two differential filtering and amplifying circuits, an A / D converter, a microcontroller, and a D / A converter. The microcontroller may employ an FPGA (Programmable Gate Array) but is not limited to the FPGA. The microcontroller is divided into demodulation module, control correction module, step wave generation module, addition module, ±(π / 2) phase difference modulation module according to the realization functions. The microcontroller also includes reset error accumulation module, 2π rese...

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PUM

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Abstract

The invention discloses a closed-loop control system of a small optical fiber gyroscope, which includes an optical fiber ring, a Y waveguide, a coupler and a detector connected in sequence through an optical fiber, the detector, a first filtering and amplifying circuit, an A / D converter, and a microcontroller , D / A converter and the second filter amplifier circuit are electrically connected successively, and the output end of the second filter amplifier circuit is connected to the phase control end of the Y waveguide; The microcontroller includes a demodulation module, a control correction module, and a ladder wave generation Module, addition module, ±(π / 2) phase difference modulation module; microcontroller also includes reset error accumulation module, 2π reset voltage correction module; described reset error accumulation module, 2π reset voltage correction module and ladder wave generation module Constitute the second closed-loop control loop. This scheme can reduce the volume of the closed-loop control system, and overcome the shortcomings that the traditional closed-loop control system cannot be applied to small fiber optic gyroscopes.

Description

technical field [0001] The invention relates to the technical field of closed-loop control of an optical fiber gyro, in particular to a closed-loop control system of a small optical fiber gyro. Background technique [0002] Fiber optic gyroscope is an angular velocity sensor based on the Sagnae effect. When the fiber optic gyroscope rotates relative to the inertial space, the two beams of light transmitted in the clockwise and counterclockwise directions along the inner fiber ring of the fiber optic gyroscope have a phase difference due to the Sagnac effect, and the angular velocity of the fiber optic gyroscope is calculated according to the phase difference. [0003] The measurement of the phase difference between the two beams of light can only be measured by detecting the interference light intensity signal of the two beams of light. There is a cosine relationship between the light intensity signal and the phase difference. The sensitivity of detecting the phase differen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C19/72
CPCG01C19/721
Inventor 朱福祥可伟赵欣
Owner HEBEI HANGUANG HEAVY IND
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