A non-interference optical gyroscope and rotation sensing method based on a polarization sensing technique

Abstract

A non-interference optical gyroscope and rotation sensing method based on a polarization sensing technique are disclosed. The method includes splitting a polarization input beam into a first beam anda second beam, coupling the first and second beams to an input/output ports of an optical loop rotated, with the propagation directions of the first beam and the second beam being contrary; combiningthe first and second beams into a combined beam; detecting polarization information of light output; providing closed feedback loop control by adopting the light output of the optical loop as a feedback so as to generate a feedback control signal; modulating the phase of at least one of the first and second beams into the optical loop by utilizing a phase modulator in a closed feedback loop; applying the feedback control signal to the phase modulator to allow a phase difference between opposite propagation signals in the optical loop to be zero or a difference between the phase difference andzero to be smaller than a preset value; and determining rotation the optical loop had undergone according to the polarization information of light output.

Description

technical field [0001] This patent application belongs to the field of optical fiber information technology, and in particular relates to a method and an optical device for measuring angular rotation information using optical fiber sensing technology. Background technique [0002] Sensing of rotation has a wide range of applications such as navigation, motion sensing, but also stability control and motion control of objects, game console controllers, and smartphone handheld devices. Typically optical gyroscopes can be designed to measure rotation by measuring the change in the optical interference pattern of two counterpropagating beams. Many optical gyroscopes employ optical Sagnac interferometer configurations of various interferometric fiber optic gyroscopes (IFOGs). This optical gyroscope can be designed without moving parts, thereby eliminating the influence of other gyroscopes (such as mechanical gyroscopes) on accuracy and life due to wear and damage of vibrating mas...

AI Technical Summary

Problems solved by technology

[0004] Due to the high production cost and large size of the traditional interferometric fiber optic gyroscope, which limits its application in the market, it is currently only used in some special fields (such as military fields, etc.), and it is rarely used in the more common civilian fields.

There are many reasons why the cost of interferometric fiber optic gyroscopes cannot be reduced. On the one hand, the interferometric principle has high requirements for devices, and high performance is required for light sources and modulators, so the cost of devices remains high.

On the other hand, the interferometric cost also has high requirements for the assembly accuracy of the gyroscope, which greatly increases the manufacturing cost, and the yield rate is often relatively low, which is not conducive to automatic mechanical assembly.

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