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Method for enlarging range of high-precision closed loop fiber-optic gyroscope assisted by MEMS (Micro-electromechanical Systems)

A technology of fiber optic gyroscope and fiber optic gyroscope, which is applied in the direction of Sagnac effect gyroscope, etc., to achieve the effect of small size, simple structure and easy installation

Inactive Publication Date: 2014-07-02
HARBIN ENG UNIV
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Problems solved by technology

Although the deviation drift of the MEMS gyroscope is much larger than that of the fiber optic gyroscope, its output accuracy can meet the needs of judging the difference between the high-precision fiber optic gyroscope detection interference series and the real interference series.

Method used

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  • Method for enlarging range of high-precision closed loop fiber-optic gyroscope assisted by MEMS (Micro-electromechanical Systems)
  • Method for enlarging range of high-precision closed loop fiber-optic gyroscope assisted by MEMS (Micro-electromechanical Systems)
  • Method for enlarging range of high-precision closed loop fiber-optic gyroscope assisted by MEMS (Micro-electromechanical Systems)

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Embodiment Construction

[0032] Below in conjunction with accompanying drawing and embodiment the present invention is further described:

[0033] Invention principle:

[0034] The principle of the fiber optic gyroscope to measure the angular velocity is that when two beams of light propagate in opposite directions in the fiber optic ring, if the fiber ring rotates relative to the inertial space, the two beams of light will have a phase difference. This phenomenon is called the Sagnac effect. The mathematical expression is where Φ s is the Sagnac phase shift, l is the length of the fiber ring, r is the radius of the fiber ring, λ is the wavelength of the light source, c 0 is the speed of light, and Ω is the input angular velocity. When the length and radius of the fiber ring are fixed, and the wavelength of the light source and the speed of light are constant, it is not difficult to see that the rotational speed is proportional to the phase shift. Therefore, by detecting the phase shift, the inpu...

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Abstract

The invention relates to a method for enlarging a range of a high-precision closed loop fiber-optic gyroscope assisted by MEMS (Micro-electromechanical Systems), which is particularly suitable for the high-precision closed loop fiber-optic gyroscope working in a large angular speed range and existing under a large-angle acceleration input environment. The method comprises the following steps: coaxially mounting an MEMS gyroscope and the high-precision closed loop fiber-optic gyroscope; sensitively inputting an angular speed; utilizing a closed loop digital phase step wave modulation-demodulation detection method to obtain an output angular speed of the high-precision closed loop fiber-optic gyroscope; collecting the output angular speed of the MEMS gyroscope; revising the high-precision closed loop fiber-optic gyroscope output of the fiber-optic gyroscope. According to the method provided by the invention, an output result of the high-precision closed loop fiber-optic gyroscope is revised according to a difference value so that the high-precision fiber-optic gyroscope can work normally under the condition of high angular speed, the aim of enlarging the range of the closed loop fiber-optic gyroscope is realized and the application of the high-precision fiber-optic gyroscope is expanded.

Description

technical field [0001] The invention relates to a method for increasing the range of a high-precision closed-loop fiber optic gyroscope based on MEMS assistance. Background technique [0002] The fiber optic gyroscope is an angular velocity sensor based on the Sagnac effect. It has the advantages of all-solid-state structure, shock resistance, large dynamic range, wide frequency range, and easy digital realization. High-precision fiber optic gyroscopes are also widely used in various fields such as aviation, aerospace, and navigation. However, as the accuracy of the fiber optic gyroscope increases, its dynamic range will decrease. The fundamental reason is that the closed-loop fiber optic gyroscope works within the angular velocity range corresponding to the first-order interference fringes. When the accuracy increases, the angular velocity corresponding to the first-order interference fringes decreases. , at this time, if the Sagnac phase shift corresponding to the input a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C19/72
CPCG01C19/72
Inventor 张勇刚孙娜李宁郜中星姜见龙王程程黄玉龙
Owner HARBIN ENG UNIV
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