Polarization nonreciprocal error elimination method of dual-polarization fiber-optic gyroscope and dual-polarization fiber-optic gyroscope
A fiber optic gyro and error elimination technology, applied in the field of gyroscopes, to achieve the effect of reducing non-reciprocal errors
Active Publication Date: 2018-09-14
PEKING UNIV
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The difference between this fiber optic gyroscope and the traditional fiber optic gyroscope is that the optical compensation effect of the two polarization states in the fiber optic ring is used for measurement. Polarization state, there will be a large polarization cross-coupling. Therefore, the polarization non-reciprocity error in the dual-polarization fiber optic gyro is much larger than that of the traditional single-polarization minimum reciprocity structure fiber optic gyroscope. How to reduce the polarization non-reciprocity has become a dual-polarization fiber optic gyroscope. One of the main challenges of the gyroscope
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[0037] In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that these embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.
[0038] Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0039] image 3 is a schematic diagram of the structure used in the present invention. Such as image 3 As shown, the structure used in the present invention includes: two broad-spectrum light sources (preferably wide-spectrum depolarized light sources) with good consistency (such as having the same or close power, center wavelength and spectral width) of two incoherent, two A circulator, two high extinction ratio Y-waveguid...
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The invention discloses a polarization nonreciprocal error elimination method of a dual-polarization fiber-optic gyroscope and the dual-polarization fiber-optic gyroscope. The method comprises the following steps: inputting a light source into two Y waveguides through a circulator respectively; inputting a signal modulated through the Y waveguides into a polarization beam splitting end of each oftwo polarization beam splitting and beam combining devices through two output ends of each Y waveguide respectively; connecting polarization beam splitting and beam combining ends of the two polarization beam splitting and beam combining devices through a polarization-maintaining fiber-optic ring; connecting each circulator with a photoelectric detector to acquire interference signals output by the Y waveguides, wherein phases of modulation signals applied to the Y waveguides are opposite; demodulating the interference signals acquired by the two photoelectric detector by adopting a harmonic demodulation method in an open-loop gyroscope. According to the polarization nonreciprocal error elimination method disclosed by the invention, nonreciprocal errors caused by polarization cross coupling are reduced to the great extent based on an existing structure of the dual-polarization fiber-optic gyroscope, so that two polarization states of the dual-polarization fiber-optic gyroscope are used.
Description
technical field [0001] The invention belongs to the technical field of gyroscopes, and in particular relates to a method for eliminating polarization non-reciprocal errors in a dual-polarization optical fiber gyroscope. 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 aircraft and weapons, precision measurement in industry and military, and other fields. The early gyroscopes were mechanical gyroscopes. Mechanical gyroscopes are directional devices manufactured using the physical principle that the rotating shaft of a high-speed rotating body has a tendency to maintain its direction. Since the mechanical gyroscope contains moving parts (such as a high-speed rotor), its structure is complex, its process requirements are high, and its accuracy is restricted in many ways. [0003] In the 1960s, with the advent of lasers, the resea...
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Login to View More IPC IPC(8): G01C25/00
CPCG01C25/005
Inventor 邓圣李玉林罗荣亚何动贲放陈方源伍洋君刘孝男操玉文彭超李正斌
Owner PEKING UNIV