Multiple optical multiplication device and method for optical fiber gyro optical path
A fiber optic gyroscope and optical path technology, applied in optics, measuring devices, optical components, etc., can solve the problems of low precision and poor stability of the fiber optic gyroscope, and achieve the effects of improving measurement accuracy, simple structure and low cost
Active Publication Date: 2022-04-05
ZHEJIANG UNIV
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Problems solved by technology
[0005] The purpose of the present invention is to overcome the deficiencies of poor stability and low precision of the existing fiber optic gyroscope, and propose a multiple optical multiplication device and method for the optical fiber gyroscope optical path, through the specific placement and coupling of two polarization beam splitters / combiners As well as the modulation of the polarization switching voltage, the incident light signal can be transmitted circularly along the polarization-maintaining optical fiber sensitive coil of the fiber optic gyroscope, and the phase accumulation caused by the angular velocity can be improved without increasing the length of the fiber, and the environmental stability of the fiber optic gyroscope can be realized without reducing the environmental stability of the fiber optic gyroscope. Improve the accuracy of the fiber optic gyroscope while keeping the volume of the fiber optic ring basically unchanged
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[0017] The present invention will be further described below in conjunction with drawings and embodiments.
[0018] Such as figure 1 As shown, the polarization beam splitter / combiner can couple two beams of orthogonally polarized light into one fiber, or split one beam of input light into two beams of orthogonal linearly polarized light for output. Its working principle is: along the polarization maintaining fiber The optical signal transmitted along the slow axis (or fast axis) along the A port can exit from the C port and transmit along the slow axis of the polarization maintaining fiber, and the optical signal transmitted along the slow axis (or fast axis) of the polarization maintaining fiber can be incident on the B port from The optical signal transmitted along the fast axis / slow axis of the polarization maintaining fiber is emitted from port C and transmitted along the fast axis of the polarization maintaining fiber. The light in the polarization-maintaining fiber conn...
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Abstract
The invention discloses a multiple optical multiplication device and method for an optical fiber gyroscope optical path, belonging to the technical field of optical fiber sensing. The invention adopts two polarization beam splitters / combiners and polarization switches in the fiber optic gyroscope, which are respectively located in the forward and reverse optical paths at both ends of the polarization-maintaining optical fiber sensitive coil. The polarization beam splitter / combiner is used to couple two beams of orthogonally polarized light into one optical fiber, or split an input beam into two beams of orthogonally linearly polarized output beams. The polarization switch can make the lines passing through it Polarized light undergoes a 90-degree polarization rotation or remains unchanged. Through the specific placement and coupling of two polarization beam splitters / combiners and the modulation of the polarization switch voltage, the incident optical signal can be transmitted circularly along the sensitive coil of the fiber optic gyroscope polarization maintaining fiber, thereby achieving the effect of optical multiplication. The structure of this scheme The method is simple and low in cost, and can effectively improve the measurement accuracy of the fiber optic gyroscope without increasing the length of the fiber.
Description
technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a multiple optical multiplication device and method for an optical fiber gyroscope optical path. Background technique [0002] The inertial navigation system is an autonomous navigation device that can provide real-time multi-directional information of the carrier, and does not require external information during its working process. As one of the core components of the inertial navigation system, the fiber optic gyroscope has a great influence on the accuracy of the inertial navigation system, and in most cases dominates the overall performance of the inertial navigation system. Therefore, the high-precision inertial navigation system puts forward higher requirements on the accuracy and performance of the fiber optic gyro used. Fiber optic gyroscopes have the advantages of high theoretical accuracy, full solid state, and high reliability. As the first choice for h...
Claims
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IPC IPC(8): G01C19/72G02B27/28
CPCG01C19/721G01C19/72G02B27/283
Inventor 梁璀张登伟周一览陈侃李楠杨建华
Owner ZHEJIANG UNIV