Multichannel feedback based Brillouin gyroscope

A technology of gyroscope and multi-mode optical fiber, which is applied in the field of Brillouin gyroscope, can solve the problem of insufficient sensitivity and achieve the effect of improving sensitivity, increasing the number, and increasing the free spectral range

Inactive Publication Date: 2013-04-17
PEKING UNIV +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the insufficient sensitivity of the measurement, the current Brillouin gyroscope usually has a deadlock phenomenon in which the frequency difference between the two directions suddenly becomes zero at low rotational speeds.

Method used

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  • Multichannel feedback based Brillouin gyroscope
  • Multichannel feedback based Brillouin gyroscope
  • Multichannel feedback based Brillouin gyroscope

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Embodiment Construction

[0029] Before describing the embodiments according to the present invention with reference to the accompanying drawings, the basic principle of the present invention will be introduced first.

[0030] For a single-channel resonator, such as a single-mode fiber ring, its free spectral range is Therefore, the line width of the resonant peak is related to the return loss of the resonant cavity. However, for a multi-channel resonant cavity, such as a multimode optical fiber, it can be considered that there are multiple resonant cavities, and the multiple resonant cavities jointly determine the output resonance point and the linewidth of the resonance peak. Suppose the loop length of each resonator is L 1 , L 2 , L 3 ,...,L k , then the multicavity free spectral range is where L' is L 1 , L 2 , L 3 ,...,L k least common multiple of .

[0031] Assuming that the number of modes that can effectively propagate in the resonator is m, when two sections of "single-mode fiber-m...

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Abstract

The invention provides a multichannel feedback based Brillouin gyroscope, comprising a narrow line width laser source, an erbium-doped optical fiber amplifier, a first opto-isolator, a second opto-isolator, a 50: 50 coupler, a 90: 10 coupler, a multistage single mode optical fiber, a multimode optical fiber, a Perot filter and a photoelectric converter. The output terminal of the narrow line width laser source is connected with the input terminal of the erbium-doped optical fiber amplifier via the first opto-isolator, the output terminal of the erbium-doped optical fiber amplifier is connected with the input port of the 50: 50 coupler via the second opto-isolator, the two output ports of the 50: 50 coupler are respectively connected with the two coupling ports of the 90: 10 coupler by virtue of an optical fiber, the two through ports of the 90: 10 coupler are connected with the multistage single mode optical fiber and the multimode optical fiber, thus forming a resonant ring, the other output port of the 50: 50 coupler is connected with the input terminal of the Perot filter via an optical fiber, and the output terminal of the Perot filter is connected with the input terminal of the photoelectric converter.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically, relates to a Brillouin gyroscope based on multi-channel feedback. Background technique [0002] A gyroscope is a rotational sensor used to measure the rotational angular velocity of the carrier on which it is mounted. Gyroscopes are widely used in the guidance of various aircraft and weapons, and various precision measurements in industry and military. There are three types of common gyroscopes: mechanical gyroscopes, laser gyroscopes, and fiber-optic gyroscopes (Fiber-optic gyroscope, FOG). The latter two are optical gyroscopes. Optical gyroscopes have the characteristics of compact structure and high sensitivity, but their stability is not as good as some modern mechanical gyroscopes. Due to the needs of the application, the new gyroscope should have high sensitivity and stability, low cost and power consumption, and small size. [0003] The principle of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C19/72G02B6/255
Inventor 贾雷张振荣王玉杰李正斌蒋云朱立新
Owner PEKING UNIV
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