Device and method for twisting detection and untwisting of panda-type polarization-maintaining optical fiber

A polarization-maintaining optical fiber and panda-type technology, which is applied in the field of panda-type polarization-maintaining optical fiber rings, can solve problems such as difficult and effective compensation, and reduce the magnetic field sensitivity of fiber optic gyroscopes, so as to realize automation, reduce radial magnetic field sensitivity, reduce The effect of a small amount of twist

Inactive Publication Date: 2015-05-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the randomness of the fiber torsion, the influence of the radial magnetic field on the output of the polarization-maintaining fiber optic gyroscope is also random, making it difficult to effectively compensate
In an ideal situation where there is no torsion, the PM fiber loop is insensitive to radial magnetic fields, which significantly reduces the magnetic field sensitivity of fiber optic gyroscopes

Method used

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  • Device and method for twisting detection and untwisting of panda-type polarization-maintaining optical fiber
  • Device and method for twisting detection and untwisting of panda-type polarization-maintaining optical fiber
  • Device and method for twisting detection and untwisting of panda-type polarization-maintaining optical fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Take the untwisted optical fiber loop wound by the commonly used panda-type polarization maintaining fiber for untwisting. The fiber coating diameter is 250 μm, the cladding diameter is 125 μm, the refractive index is 1.4573, the fiber core diameter is 6 μm, and the refractive index is 1.46878. The diameter of the stress zone is 26 μm, the refractive index is 1.44388, the distance between the center of the cat’s eye stress zone and the fiber core is 21 μm, and the collected light intensity distribution is as follows Image 6 As shown, its calibration curve is collected at an angular interval of 1°, such as Figure 7 shown. Identify the azimuth angle θ of the fast axis at the initial moment of fiber winding 0 is 45°, the image sensor collects the light intensity distribution at a time interval of 1s, and recognizes that L is 4500μm at 100s, finds the L value corresponding to 49° on the calibration curve as 4450μm, and the L value corresponding to 50° is 4520μm, use Lin...

Embodiment 2

[0054] In Example 1, the initially recognized fast axis position is 5°, and the L value is recognized as 3000 μm at the 100th second, and the L value corresponding to 24° is found to be 2900 μm, and the L value corresponding to 25° is found to be 3020 μm on the calibration curve. Use linear interpolation to calculate the corresponding θ value when L=3000μm:

[0055]

[0056] And it is recognized that L1>L2, that is, the azimuth angle at this time is -24.83°. Then the torsion angle is: Δθ=-24.83°-5°=-29.83°.

[0057] The computer 7 sends the angle information to the controller 8, and the controller 8 controls the back-twist table 2 to rotate clockwise by 29.83° to reduce the twist angle.

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Abstract

The invention discloses a device and a method for twisting detection and untwisting for a panda-type polarization-maintaining optical fiber. The device comprises optical fiber deploying equipment, optical fiber retracting equipment, an untwisting rotating table, a light source, an optical lens, an image senor, a computer and a controller. The method comprises the following steps: the side-view lens effect of the optical fiber is utilized, and the light source perpendicularly illuminates a side surface of the optical fiber, so that light distribution, being reflected by the optical fiber, contains twisting angle information of the optical fiber; the light distribution is acquired by the image sensor; the twisting angle information is extracted through data processing of the computer; according to the twisting angle information, the controller controls the untwisting rotating table to rotate for untwisting of the optical fiber. Through the adoption of the method, optical fiber twisting detection can be combined with optical fiber untwisting, that is, the optical fiber can be coiled while being untwisted. Therefore, a polarization-maintaining optical fiber coil with a low twisting angle can be prepared, and the requirement for manufacturing an optical fiber top which is low in magnetic sensitivity can be met.

Description

technical field [0001] The invention relates to a device and method for measuring the torsion degree of a panda-shaped polarization-maintaining optical fiber and winding a panda-shaped polarization-maintaining optical fiber ring with anti-twist. Background technique [0002] High-precision fiber optic gyroscopes mainly use polarization-maintaining fibers to wind fiber optic rings, and panda-type polarization-maintaining fibers are one of the most commonly used types of polarization-maintaining fibers. The magnetic field sensitivity of polarization-maintaining fiber optic gyroscope is closely related to the torsion degree of polarization-maintaining fiber when the fiber is wrapped around. The greater the degree of torsion, the more sensitive the fiber optic gyroscope is to the radial magnetic field. [0003] Due to the randomness of the fiber torsion, the influence of the radial magnetic field on the output of the polarization-maintaining fiber optic gyroscope is also random,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/26G01C19/72
Inventor 刘梦楠张彩妮罗天舒晓武刘承
Owner ZHEJIANG UNIV
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