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Measuring system of fibre-optical residual stress

A technology of residual stress and measurement system, applied in optical radiation measurement, force/torque/work measuring instrument, measuring force, etc., can solve problems such as difficult to accurately measure optical fiber

Inactive Publication Date: 2004-05-19
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to accurately measure the residual stress and its distribution in optical fibers, especially in optical fibers with asymmetric circular stress distribution or with regularly spaced air holes along the fiber armor (called photonic crystal fiber)

Method used

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  • Measuring system of fibre-optical residual stress
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  • Measuring system of fibre-optical residual stress

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Embodiment Construction

[0036] First, the present invention is based on the following technical principles.

[0037] In order to measure the stress of an optical fiber having an asymmetric stress distribution, according to the technique of the present invention, the stress is measured along various directions ranging from 0° to 180°. When the stress is measured at a certain angle á, the difference between the phase shifts of each axis caused by the residual stress can be given as the following equation 1:

[0038] Formula 1

[0039] δ α (t)=2π / λ∫[n z (t,s)-n t (t, s)]ds where, ё represents the wavelength of the incident beam, n z and n t denotes the refractive index relative to the fiber reference axis, and s denotes the distance traveled by the beam. Equation 1 represents the difference in phase shift along two directions, ie, along the z-axis and the x-axis. The difference between the phase shifts given by Equation 1 enables the two-dimensional axial residual stress distribution to be obtain...

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Abstract

Disclosed is a residual stress measuring system for measuring the residual stress in an optical fiber. The residual stress measuring system comprises a light source for generating light used to measure the residual stress, a lens system for converting the generated light into a plane wave, a polarimeter for transforming the converted light to an input polarized light, which is incident on the optical fiber, a rotational measuring section for rotating the optical fiber so as to enable the polarized light to transmit through the optical fiber in various directions, and a detector for detecting the residual stress from a phase shift of the transmitted light.

Description

technical field [0001] The present invention relates to an optical fiber residual stress measurement system, and more particularly, to a measurement system for measuring residual stress held in an optical fiber and having an asymmetrical circular stress distribution. Background technique [0002] Generally speaking, residual stress from the drawing fiber fabrication stage remains in the fiber. This residual stress causes an undesirable change in the refractive index of the fiber and thus increases the optical loss in the fiber due to photoelastic effects. Likewise, the residual stress and its distribution in the fiber must be accurately measured and then adjusted accordingly. [0003] The photoelastic effect is usually used to measure the residual stress in the optical fiber. The so-called photoelastic effect is the phenomenon that the refractive index of the optical fiber changes along the direction of the residual stress in the transparent solid medium, such as the optica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/00G01J4/00G01L1/24G01L5/00G01M11/00G01M11/02G01M11/08G01N21/00G02B6/00
CPCG01L5/0047G01L1/00
Inventor 卢成仁金现哲朴用雨
Owner SAMSUNG ELECTRONICS CO LTD