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Special optical fiber sensing cable

A technology of optical fiber sensing and optical cable, which is applied in the direction of fiber mechanical structure, etc., can solve the problems of poor mechanical stability, output waste products, error-prone wiring, etc., and achieve the effect of stable structure and high consistency

Inactive Publication Date: 2016-08-24
杨青
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The disadvantage of these technical solutions is that in the process of laying the optical cable, it is necessary to apply an external force to make the optical cable or optical fiber form an S shape, and the process is complicated, especially if it is done manually, the reliability and consistency are difficult to guarantee; the S-shaped optical cable or optical fiber itself The structure is loose, the mechanical stability is poor, and it is easy to make mistakes when entering the line, resulting in waste products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] figure 1 It is a structural diagram of Embodiment 1 of the present invention.

[0033] The optical fiber 1 has a coating with an outer diameter of 250 microns, the tensile element 2 is a stainless steel tube with an outer diameter of 2.5mm, and the optical fiber 1 is built in and filled with oil; the belt body 3 is made of polyvinyl chloride.

[0034] The belt body 3 has a width of 50 mm and a thickness of 1.0 mm; the tensile element 2 is S-shaped, consisting of arcs and straight segments with a bending radius of 50 mm and a pitch of 180 mm.

[0035] During the manufacturing process of the optical cable, the tensile element 2 with the built-in optical fiber 1 is firstly bent into an S-shape mechanically, and then the tape body 3 is added by a thermoplastic process. In this way, it can be ensured that the tensile element 2 has no prestress and the belt surface is flat.

[0036] It can be seen from the above structure that the strip body 3 has a light and thin structure...

Embodiment 2

[0039] figure 2 It is a structural diagram of Embodiment 2 of the present invention.

[0040] The optical fiber 1 and the tensile element 2 have an S-shaped curve and are arranged inside the belt body 3; on the belt body 3, a stress relief hole 4 and a stress relief groove 5 are opened around the optical fiber 1 and the tensile element 2.

[0041] The S-shaped curve of the optical fiber 1 and the tensile element 2 can be selected from double circular arcs, sinusoidal curves, and B-spline curves, and can be selected according to the width requirements of the S-shaped curve, the allowable minimum bending radius of the optical fiber 1, and the excess length ratio requirements .

[0042] The allowable minimum bending radius of the optical fiber 1 is mainly determined by the bending resistance performance of the optical fiber 1 itself and the total loss requirement. In long-distance (several kilometers to tens of kilometers) detection, the total loss must be strictly controlled....

Embodiment 3

[0062] image 3 It is a structural diagram of Embodiment 3 of the present invention.

[0063] The optical fiber 1 and the tensile element 2 are S-shaped curves and are arranged inside the belt body 3; on the belt body 3, there are stress release holes 4 around the optical fiber 1 and the tensile element 2; Press bump 8.

[0064] It can be seen from the above structure that the anti-compression protrusion 8 can prevent the structure in the middle of the belt body 3 from being stressed, and the stress relief hole 4 arranged between the anti-compression protrusion 8 and the S-shaped curve is beneficial to the optical fiber 1 and the tension-resistant The movement of the element 2, during installation and use, the optical fiber 1 is not subject to tension, torsion or pressure.

[0065] The selection of materials and structures can refer to Example 2.

[0066] Optionally, a reinforcing element 9 is provided within the compression-resistant projection 8 .

[0067] A specific sol...

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Abstract

The invention relates to the field of optical fiber sensing, and provides a special optical fiber sensing cable capable of large-scale production. The special optical fiber sensing cable comprises an S-shaped optical fiber prefabricated therein, and has good tensile property and mechanical stability. The invention discloses a scheme that the special optical fiber sensing cable comprises the optical fiber, a tensile element and a flat belt body, wherein the optical fiber and the tensile element are arranged inside the belt body, advance along the length direction of the belt body and periodically bend in the width direction to form an S shape, and the belt body is made of materials such as thermoplastic plastics, rubber or a plastic rubber compound. The belt shaped optical cable can have very high tension capacity and adjusts strain or stress transmitted to the sensing optical fiber through a mechanical structure of the optical cable, and various kinds of special optical fiber sensing cables with different purposes and specifications can be implemented through differential design.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a special optical cable for optical fiber sensing. Background technique [0002] In the field of optical fiber sensing application technology, it is often necessary to arrange the detection optical fiber or optical cable in an S-shape, that is, periodically bend and travel, for the following reasons: [0003] The detection optical fiber is laid in the outer sheath of the high-voltage single-core cable, or in the pipe wall of a flexible pipe (such as a marine composite flexible pipe); during the loading and installation process, the bending of the cable or flexible pipe will form at the location of the detection optical fiber. 1% to 5% stretch or compression along the length. The excess length of the optical fiber in the cable is generally not more than 0.3%, and the allowable strain of the optical fiber in terms of mechanical strength is not more than 1%. Therefore, if the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/44
Inventor 杨青
Owner 杨青
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