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Four-frequency differential Brillouin optical fiber gyroscope

A four-frequency differential, fiber optic gyroscope technology, applied in the field of fiber optic gyroscopes, can solve problems such as bias frequency instability

Inactive Publication Date: 2007-11-07
HARBIN ENG UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-precision four-frequency differential Brillouin fiber optic gyroscope that can solve the problems of frequency locking and judgment of rotation direction, eliminate the instability of bias frequency

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  • Four-frequency differential Brillouin optical fiber gyroscope
  • Four-frequency differential Brillouin optical fiber gyroscope

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Embodiment Construction

[0016] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0017] 1, the four-frequency differential Brillouin fiber optic gyroscope in this embodiment consists of a narrow linewidth fiber laser 1, a first isolator 2, a first coupler 3, a first pump light 4, a second pump light 5, Adjustable optical attenuator 6, acousto-optic frequency shifter 7, second isolator 8, second coupler 9, third coupler 10, four-frequency differential detection device 11, fiber ring cavity 12, first detector 13 and The closed-loop feedback circuit 14 is composed, the laser light output by the narrow-linewidth fiber laser 1 is connected to the input end of the first isolator 2, and the output end of the first isolator 2 is connected to the first port of the first coupler 3, and the first The coupling ratio of the coupler 3 is 50:50, and the laser light output by the narrow-linewidth fiber laser 1 is equally divided by the first coupler 3 to form...

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Abstract

The invention provides a four-frequency differential Brillouin optical-fiber gyro, comprising narrow-line width optical-fiber laser, first isolator, first coupler, first pumped light, second pumped light, adjustable light attenuator, acousto-optic frequency shifter, second isolator, second coupler, third coupler, four-frequency differential detector, optical-fiber annular cavity, first detector and closed-loop feedback circuit. And it uses the frequency-biasing technique of pumped light to solve the problem of determining frequency locking and rotating directions and uses the four-frequency differential detection technique to eliminate the errors caused by unstable frequency biasing so as to obtain high-accuracy Brillouin optical gyro.

Description

(1) Technical field [0001] The invention relates to a gyroscope device in an optical fiber, in particular to an optical fiber gyroscope based on the principle of stimulated Brillouin scattering and a four-frequency differential detection method. (2) Background technology [0002] The development of fiber optic gyroscope has experienced the first generation of interference fiber optic gyroscope, the second generation of resonant cavity fiber optic gyroscope and the third generation of Brillouin fiber optic gyroscope. At present, interferometric fiber optic gyroscopes with various precisions have been commercialized, and resonant cavity fiber optic gyroscopes are still in the research stage due to some technical difficulties. The new generation of Brillouin fiber optic gyroscope has attracted widespread attention because of its advantages. Brillouin fiber optic gyroscope has some advantages shared by fiber optic gyroscopes: short start-up time, small size, light weight, low p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C19/72
Inventor 吕月兰董永康
Owner HARBIN ENG UNIV
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