A fiber optic gyroscope and its method based on a magneto-optical switch to achieve multi-turn around
A fiber optic gyroscope and fiber optic technology, applied in Sagnac effect gyroscopes, gyroscopes/steering sensing equipment, instruments, etc., can solve problems such as large parasitic phase noise and susceptibility to interference from the external environment, and achieve noise suppression , reduce cost, reduce the effect of length
Active Publication Date: 2021-04-20
ZHEJIANG UNIV
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Problems solved by technology
In this structure, the fiber optic ring usually adopts the four-pole symmetrical winding method or the bipolar symmetrical winding method, which can reduce the influence of external temperature and vibration. Larger parasitic phase noise, easy to be interfered by the external environment
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[0021] Such as figure 1 As shown, a schematic diagram of a fiber optic gyroscope based on a magneto-optical switch to achieve multi-turn around, including a broadband light source 1, a coupler 2, a Y waveguide 3, a first polarization beam splitter 4, a Faraday rotator 5, a second Two polarization beam splitters 6, optical fiber sensing rings 7, photodetectors 8;
[0022] The output end of described wide-spectrum light source 1 and the receiving end of photodetector 8 are connected with two port optical fibers on the same side of coupler 2 respectively, and a port on the other side of coupler 2 is connected with Y waveguide 3 input port optical fibers; The first output port 3-1 of the waveguide and the second output port 3-2 of the Y waveguide are respectively connected with the fourth port 4-4 of the first polarization beam splitter and the fourth port 6-4 of the second polarization beam splitter by optical fibers; A Faraday rotator 5 is arranged between the polarization beam...
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The invention discloses an optical fiber gyroscope based on a magneto-optic switch to realize multi-circle and a method thereof. The light emitted by the light source enters the Y waveguide through the coupler, and under the polarizing effect of the Y waveguide, the s-polarized light passes through the polarization beam splitter and reaches the Faraday rotator. According to the magnetic field generated by the current coil, the arriving s-polarized light is rotated by 90 degrees and turned into p-polarized light. Due to the birefringence effect, the two beams of p-polarized light returning to the polarization beam splitter will not return to the Y waveguide along the original optical path, but will enter the fiber ring and circle around the fiber ring. The current of the magnetic field is controlled to maintain the light around the fiber ring. After that, the current is turned off, so that the two beams of forward and reverse p-polarized light circulate in the optical fiber sensing ring; after multiple circles, the current magnetic field is added, so that the two beams of p-polarized light pass through the Faraday rotator to become S polarized light, the s light returns to the Y waveguide through the polarization beam splitter. The invention realizes the multi-turn circulation of the light in the optical fiber ring, and can obtain the optical fiber gyroscope with higher sensitivity.
Description
technical field [0001] The invention relates to an optical fiber gyroscope, in particular to an optical fiber gyroscope and a method thereof based on a magneto-optical switch for realizing multi-turn winding. Background technique [0002] Gyroscopes are the mainstream devices in the inertial field. The most popular one is the fiber optic gyroscope based on the Sagnac effect. Compared with traditional mechanical gyroscopes, it has the characteristics of simple structure, long life and high precision. Today, the design technology of fiber optic gyroscopes has matured, and improvements will be made in terms of improving accuracy, sensitivity, and stability. [0003] In the traditional interferometric fiber optic gyroscope, the two beams of light output from the Y waveguide propagate into the fiber optic ring clockwise and counterclockwise respectively, and the rotational angular velocity is calculated by calculating the Sagnac phase shift. In this structure, the fiber optic ri...
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IPC IPC(8): G01C19/72
CPCG01C19/721
Inventor 周柯江李亚旭吴巍然冼拓华吕呈辉
Owner ZHEJIANG UNIV