Novel double-end-polarization-state-detection-based fiber gyroscope structure with mode coupling tolerance
A technology of fiber optic gyroscope and mode coupling, which is applied to Sagnac effect gyroscopes, gyroscopes/steering sensing equipment, measuring devices, etc., can solve problems such as insignificant benefits, rising costs, and harsh polarization-maintaining fiber rings, and achieve The effect of reducing zero drift and improving detection accuracy
Active Publication Date: 2019-11-26
NANJING HENGGAO OPTO ELECTRONICS RES INST CORP
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Problems solved by technology
At present, in order to improve the accuracy of the polarization-maintaining fiber optic gyroscope and reduce the zero-point drift, feedback technology, resonance technology and various compensation technologies have been adopted, which can be said to have been achieved to the extreme, and the requirements for the polarization-maintaining fiber optic Coupling and stress must be strictly screened, which leads to increased costs, and the benefits in exchange are not obvious
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[0042] Below in conjunction with specific embodiment, further illustrate the present invention. These examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "equipped with" and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or Integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.
[0043] Now in conjunction with the accompanying drawings, the structural features of the present invention will be described in detail. ...
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The invention relates to the technical field of optical fiber sensing, in particular to a novel double-end-polarization-state-detection-based fiber gyroscope structure with the mode coupling tolerance. The novel fiber gyroscope structure comprises a light source. The output terminal of a light source is connected to the input terminal of a polarization controller by a fiber; the output terminal ofthe polarization controller is connected to a first port of a circulator by a fiber; a second port of the circular is connected to the input terminal of a Sagnac interferometer formed by an optical coupler and an optical fiber ring; a third port of the circular is connected to a second fiber beam splitter PBS2; and the output terminal of the Sagnac interferometer is connected to a first fiber beam splitter PBS1. Output terminals of two polarization beam splitters are respectively connected to a digital acquisition card with a light detector; and the digital acquisition card is connected witha microcomputer electrically by a signal line. Therefore, the output signals of two polarization beam splitters are detected and the angular velocity of the fiber gyroscope is calculated under the condition of fiber mode coupling tolerance, so t hat the accuracy of the fiber gyroscope is further improved and the zero drift is reduced.
Description
technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a novel structure of an optical fiber gyroscope based on dual-end polarization state detection that tolerates the presence of mode coupling. 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. 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, an...
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IPC IPC(8): G01C19/72
CPCG01C19/725
Inventor 吴重庆
Owner NANJING HENGGAO OPTO ELECTRONICS RES INST CORP