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Optical fiber sensor and working method thereof

An optical fiber sensor and optical fiber technology, which is applied to instruments, optical devices, measuring devices, etc., can solve the problem that the macrobending loss of optical fibers is not easy to accurately represent the width of structural cracks, and achieve good use value, simple change process, and simplified changes. the effect of the condition

Active Publication Date: 2016-09-14
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an optical fiber sensor, which solves the problem that the macrobending loss of the optical fiber is difficult to accurately represent the width of structural cracks due to changes in the bending radius of the optical fiber during the monitoring of structural cracks in the existing optical fiber sensor

Method used

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  • Optical fiber sensor and working method thereof
  • Optical fiber sensor and working method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The light source with a wavelength of 1310nm is connected through the optical fiber b14, and the optical power meter is connected with the optical fiber c15. The optical fiber b14 is connected with the optical fiber a13 and the optical fiber a13 is fixed on the rotating shaft a2. a13 wraps around the rotating shaft a2 once, the diameter of the addendum circle of the driving gear 4 is 54mm, the diameter of the addendum circle of the driven gear 5 is 18mm, and the standard coefficient λ of the known sensor is 35.601mm / db. 8 are connected to both sides of the structural crack respectively, and the measured reading R 1 7.34db, reading R 0 It is 6.03db, which can be brought into the formula to get D=46.64mm, which shows that the cracks of the structure have expanded by 46.64mm.

Embodiment 2

[0038] The light source with a wavelength of 1310nm is connected through the optical fiber b14, and the optical power meter is connected with the optical fiber c15. The optical fiber b14 is connected with the optical fiber a13 and the optical fiber a13 is fixed on the rotating shaft a2. a13 winds the shaft a2 three times, the diameter of the addendum circle of the driving gear 4 is 54mm, the diameter of the addendum circle of the driven gear 5 is 18mm, and the standard coefficient λ of the known sensor is 51.140mm / db. Block 8 is fixed to both sides of the structural crack respectively, and the measured reading R 1 7.56db, reading R 0 It is 7.42db, which can be brought into the formula to get D=7.16mm, which shows that the cracks of the structure have expanded by 7.16mm.

Embodiment 3

[0040] The light source with a wavelength of 1310nm is connected through the optical fiber b14, the optical power meter is connected with the optical fiber c15, the optical fiber b14 is connected with the optical fiber a13 and the optical fiber a13 is fixed on the rotating shaft a2, the diameter of the rotating shaft b3 is 17.54mm, and the diameter of the rotating shaft a2 is 52.62mm. a13 winds around the rotating shaft a2 five times, the diameter of the addendum circle of the driving gear 4 is 60mm, the diameter of the addendum circle of the driven gear 5 is 20mm, and the standard coefficient λ of the known sensor is 152.631m mm / db. Block 8 is fixed to both sides of the structural crack respectively, and the measured reading R 1 7.33db, reading R 0 It is 7.55db, which can be brought into the formula to get D=-30.58mm, which shows that the cracks of the structure are closed by 30.58mm.

[0041] An optical fiber sensor of the present invention fixes the bending radius of the opt...

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Abstract

The invention discloses an optical fiber sensor and a working method thereof. The optical fiber sensor comprises a shell. A rotating shaft a and a rotating shaft b are distributed in the shell. The rotating shaft a is sequentially sleeved with a driving gear and a rolling bearing a from top to bottom. The rotating shaft b is sequentially sleeved with a driven gear and a rolling bearing b from top to bottom. The driven gear is meshed with the driving gear. The driving gear is further meshed with a rack. One end of the rack is sequentially connected with a pushing rod and a fixing block. The pushing rod penetrates through a through hole in the shell to be fixedly connected with the fixing block. The rotating shaft a and the rotating shat b are provided with winding devices. According to the optical fiber sensor, the bending radius of an optical fiber is fixed due to the fact that the rotating shaft a and the rotating shaft b are arranged, the bending radius is kept unchanged in the changing process of the bending length of the optical fiber by means of movement of the rotating shaft a and the rotating shaft b, conditions causing changes of optical fiber macrobending loss are simplified, the changing process of the optical fiber macrobending loss is simpler, and the good using value is obtained.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing equipment, in particular relates to an optical fiber sensor, and also relates to a working method of the optical fiber sensor. Background technique [0002] When the fiber is bent, the light is transmitted in the bent part. To keep the electromagnetic field of the same phase on the same plane, the plane wavefront of the conduction mode must take the center of curvature of the bent fiber as the center of rotation, so the closer it is to the outside, the The longitudinal velocity of the fiber axis must be greater. When a certain critical curvature is exceeded, the phase velocity will be greater than the phase velocity of the cladding plane wave, and the conduction mode will become a radiation mode, causing a loss of beam power. This loss is called the macrobending loss of the fiber. Studies have shown that within a certain range, when the bending radius of the fiber is smaller, that i...

Claims

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Application Information

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IPC IPC(8): G01B11/02
CPCG01B11/02
Inventor 李亚明杨杰马钰明程琳
Owner XIAN UNIV OF TECH