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Double-sided W-shaped long-period fiber grating and application thereof in strain and temperature sensing

A fiber grating and long-period technology, which is applied in cladding optical fiber, optical waveguide light guide, optics, etc., can solve the problems of susceptibility to interference and poor precision, and achieve the effect of high sensitivity and high sensing accuracy

Active Publication Date: 2021-07-23
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the present invention provides a double-sided W-shaped long-period fiber grating and its related applications, which are used to solve the problem of poor accuracy or susceptibility to interference when the fiber grating senses strain in the current technology

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  • Double-sided W-shaped long-period fiber grating and application thereof in strain and temperature sensing
  • Double-sided W-shaped long-period fiber grating and application thereof in strain and temperature sensing
  • Double-sided W-shaped long-period fiber grating and application thereof in strain and temperature sensing

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Embodiment Construction

[0040] Embodiments of the present invention are described in detail below, and examples of the illustrated embodiments are illustrated in the drawings, wherein like or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0041] (1) Fiber Bragg grating structure:

[0042] Such as Figure 1 to Figure 3 In the shown double-sided W-shaped long-period fiber grating, a groove section is respectively etched on opposite sides of the fiber surface, and the two groove sections are symmetrical to each other, and each groove section contains n W-shaped grooves, The W-shaped grooves are arranged at equal intervals along the fiber axis; the depth of the bottom ends on both sides of the W-shaped grooves (the vertical distance from p...

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Abstract

The invention provides a double-sided W-shaped long-period fiber grating, which is characterized in that groove sections are symmetrically etched on two sides of the surface of an optical fiber respectively, each groove section is formed by arranging a plurality of W-shaped grooves at equal intervals along the axial direction, the depth d1 of the bottom ends of two sides of each W-shaped groove is 25 microns, the depth d2 of a bulge in the middle of each W-shaped groove is 20 microns, the length w of each W-shaped groove is 250 microns, the number n of the W-shaped grooves in each groove section is 21, and the period f of the grating is 550 microns. According to the invention, the transmission spectrum of the grating fiber has two harmonic peaks, the wavelengths of the two harmonic peaks are in good linear relation with the axial strain and the temperature respectively, the grating fiber can be used for sensing the strain and the temperature, the measurement precision is high, the grating fiber can be used for strain-temperature cross sensing, and then interference of the temperature to a strain measurement result is eliminated.

Description

technical field [0001] The invention belongs to the technical field of optical fiber gratings, and in particular relates to a double-sided W-shaped long-period optical fiber grating and its application. Background technique [0002] Optical fiber is a fiber-like material used for light transmission, and fiber grating is a diffraction grating based on optical fiber, through which the refractive index of the fiber core is modulated axially and periodically by a certain method. The emergence of fiber grating technology has not only profoundly changed the communication industry, but also had a great impact on the field of sensing technology. [0003] In the prior art, the corresponding strain sensors based on fiber gratings still have disadvantages such as low precision or susceptibility to interference. Therefore, further research and exploration on the use of fiber gratings for strain sensing is still needed. Contents of the invention [0004] Aiming at the deficiencies in ...

Claims

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Application Information

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IPC IPC(8): G02B6/02G01D21/02
CPCG02B6/02095G01D21/02
Inventor 印杰克
Owner JIANGSU UNIV
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