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An optical fiber sensor and its working method

An optical fiber sensor and optical fiber technology, applied in the direction of instruments, optical devices, measuring devices, etc., can solve the problem that the macrobending loss of optical fiber is not easy to accurately express the width of structural cracks, etc., achieve good use value, simple change process, and simplify changes. conditional effect

Active Publication Date: 2018-11-27
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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  • An optical fiber sensor and its working method
  • An optical fiber sensor and its working method

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, the optical fiber c15 is connected to the optical power meter, the optical fiber b14 is connected to the optical fiber a13 and the optical fiber a13 is fixed on the shaft a2, the diameter of the shaft b3 is 13.48mm, and the diameter of the shaft a2 is 40.44mm. a13 wraps around the 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, the standard coefficient λ of the known sensor is 35.601mm / db, and the housing 1 and the fixed block 8 are fixedly connected to both sides of the structural crack, and the reading R is measured 1 7.34db, reading R 0 It is 6.03db, and D=46.64mm can be obtained when it is brought into the formula. It can be seen that the cracks of the structure are expanded by 46.64mm.

Embodiment 2

[0038] The light source with a wavelength of 1310nm is connected through the optical fiber b14, the optical fiber c15 is connected to the optical power meter, the optical fiber b14 is connected to the optical fiber a13 and the optical fiber a13 is fixed on the shaft a2, the diameter of the shaft b3 is 14.54mm, and the diameter of the shaft a2 is 43.62mm. 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, fix the housing 1 and Block 8 is fixedly connected to both sides of the structural crack, and the reading R is measured 1 7.56db, reading R 0 It is 7.42db, and D=7.16mm can be obtained by putting it into the formula. It can be seen that the cracks of the structure have spread by 7.16mm.

Embodiment 3

[0040] The light source with a wavelength of 1310nm is connected through the optical fiber b14, the optical fiber c15 is connected to the optical power meter, the optical fiber b14 is connected to the optical fiber a13 and the optical fiber a13 is fixed on the shaft a2, the diameter of the shaft b3 is 17.54mm, and the diameter of the shaft a2 is 52.62mm. a13 winds the 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, the standard coefficient λ of the known sensor is 152.631m mm / db, and the housing 1 is fixed with Block 8 is fixedly connected to both sides of the structural crack, and the reading R is measured 1 7.33db, reading R 0 It is 7.55db, and D=-30.58mm can be obtained by putting it into the formula. It can be seen that the cracks of the structure are closed by 30.58mm.

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

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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, and specifically relates to an optical fiber sensor. The invention also relates to a working method of the optical fiber sensor. Background technique [0002] When the optical fiber is bent, the light is transmitted in the bending part. If you want to keep the electromagnetic field of the same phase in the same plane, the plane wavefront of the conducted mode must be centered on the center of curvature of the bent optical fiber. The longitudinal speed 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 conducted mode will become a radiation mode, which will cause the loss of beam power. This loss is called the macrobending loss of the optical fiber. Studies have shown that, within a certain range, when the bend radius of the optical fiber is smaller, tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/02
CPCG01B11/02
Inventor 杨杰李亚明程琳李炎隆马钰明
Owner XIAN UNIV OF TECH