Metal spiral armored temperature sensing optical cable

Abstract

The utility model relates to the technical field of special optical cables, in particular to a metal spiral armored temperature sensing optical cable, which comprises an optical fiber. The PBT beam tube is arranged on the outer layer of the optical fiber; the NTE temperature compensation layer has a negative expansion coefficient and is tightly attached to the inner side wall of the PBT beam tube; the stranded steel wire layer is arranged on the outer layer of the PBT beam tube; the wrapping tape layer tightly wraps the outer layer of the stranded steel wire layer; the PE outer sheath layer is arranged on the outer layer of the belting layer; ointment is filled between the optical fibers and the PBT beam tube; a multi-layer composite structure is adopted, so that the cable has relatively high mechanical performance, is resistant to UV aging and waterproof, and is suitable for being laid in manners of burying underground, hanging nets, pipelines and the like; the hardness is moderate, and laying construction is convenient; and the optical fiber is small in loss and suitable for long-distance BOTDR (or BOTDA) optical fiber sensing application.

Description

TECHNICAL FIELD

[0001] The utility model relates to special optical cable technical field, concretely relates to metal spiral armoring temperature sensing optical cable. BACKGROUND

[0002] BOTDR temperature monitoring technology is the temperature monitoring technology based on optical fiber and its scattering effect. Its basic principle is to utilize the characteristics of Raman scattering, emit laser into the optical fiber, and monitor the temperature of specific position on the optical fiber length by detecting the frequency of Raman scattered light. BOTDR temperature monitoring technology can better realize temperature monitoring in tunnel engineering by monitoring the temperature change in the optical fiber, and timely find temperature abnormal conditions.

[0003] The sensing optical cable for strain monitoring and temperature compensation applied to BOTDR (or BOTDA) optical fiber sensing system is widely used in airport, power plant, chemical enterprise, power cable, railway, highway mine area and other areas, and needs to have the performance advantages of high tensile, compression resistance, twist resistance, rat bite resistance, knife cutting resistance, softness and toughness, etc. The existing optical cable structure strength is not enough, and the applicable temperature domain is narrow, and it cannot cope with the long-distance BOTDR (or BOTDA) optical fiber sensing application in various complex use scenarios. UTILITY MODEL CONTENT

[0004] I. Technical problems to be solved

[0005] The utility model aims at providing metal spiral armoring temperature sensing optical cable, which has good mechanical properties, wide applicable temperature domain and can cope with long-distance BOTDR (or BOTDA) optical fiber sensing application.

[0006] II. Technical scheme

[0007] The utility model realizes the following technical scheme:

[0008] The utility model provides metal spiral armoring temperature sensing optical cable, which comprises:

[0009] Optical fiber;

[0010] PBT bundle tube, which is arranged on the outer layer of the optical fiber;

[0011] NTE temperature compensation layer, which has a negative expansion coefficient and is closely attached to the inner side wall of the PBT bundle tube;

[0012] Stranded steel wire layer, which is arranged on the outer layer of the PBT bundle tube;

[0013] Tape layer, which is tightly wrapped on the outer layer of the stranded steel wire layer;

[0014] PE outer sheath layer, which is arranged on the outer layer of the tape layer;

[0015] The oil paste is filled between the optical fiber and the PBT bundle tube.

[0016] Further, the optical fiber is 0.25 mm colored optical fiber, and the optical fiber has 1-5.

[0017] Further, the PE outer sheath layer adopts MDPE material, and has a nominal thickness of 1.0 mm and an outer diameter of 5.0 mm±0.2 mm.

[0018] Further, the twisted steel wire layer is 0.6 mm stainless steel wire.

[0019] Further, the PBT bundle tube is a polybutylene terephthalate bundle tube, and has a diameter of 1.8 mm.

[0020] Further, the TPE tight sleeve layer is uniformly distributed with a plurality of structural reinforcing ribs extending in the axial direction.

[0021] Three, beneficial effects

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] 1, the utility model discloses a multilayer composite structure, has higher mechanical performance, anti-UV aging, waterproof, is suitable for burying, hangs the net, pipeline etc. and lays in the mode of

[0024] 2, through setting NTE temperature compensation layer can through the reverse expansion of itself to offset the influence of other layer deformation to optical fiber, has high precision and high stability, temperature application range is wide, is applied to -40 ℃-+85 ℃ temperature domain.

[0025] 3, through setting structural reinforcing rib, has improved the bending resistance in the axial direction, and the hardness is moderate, and the laying construction is convenient, and the loss is small, and is suitable for long-distance BOTDR (or BOTDA) optical fiber sensing application. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the structure schematic diagram of the utility model;

[0027] 1, PE outer sheath layer, 2, wrapping layer, 3, twisted steel wire layer, 4, TPE tight sleeve layer, 5, structural reinforcing rib, 6, PBT bundle tube, 7, NTE temperature compensation layer, 8, oil paste, 9, optical fiber. DETAILED DESCRIPTION

[0028] In order to make the utility model purposes, technical schemes and advantages more clearly, the following will be further described in detail with the drawings and examples.

[0029] Metal spiral armor type temperature sensing optical cable, please refer to Figure 1 , including 1-5, the diameter of 0.25 mm colored fiber 9, the outer layer of fiber 9 is provided with PBT beam tube 6 of polybutylene terephthalate material, the diameter is 1.8 mm, the NTE temperature compensation layer 7 is tightly attached to the inner wall of PBT beam tube 6, the NTE temperature compensation layer 7 is a ceramic powder filled composite material with negative thermal expansion coefficient, which offsets the influence of temperature on fiber 9 by its reverse expansion when the ambient temperature changes;A twisted steel wire layer 3 is arranged on the outer layer of PBT beam tube 6, the twisted steel wire layer 3 is made of 12 0.6 mm stainless steel wires twisted in a spiral shape, forming a spiral armor structure with certain toughness and high strength;The wrapping layer 2 is tightly wrapped outside the twisted steel wire layer 3, and the PE outer sheath layer 1 is arranged outside the wrapping layer 2, wherein the PE outer sheath layer 1 is made of MDPE material, the nominal thickness is 1.0 mm, and the outer diameter is 5.0 mm±0.2 mm. Fiber 9 and PBT beam tube 6 are filled with special oil paste 8 for fiber 9.

[0030] A TPE tight sleeve layer 4 is arranged between the PBT beam tube 6 and the twisted steel wire layer 3, and a plurality of structure reinforcing ribs 5 extending along the axial direction are uniformly distributed in the TPE tight sleeve layer 4, the TPE tight sleeve layer 4 has good flexibility and resilience, and can effectively absorb and disperse stress. The structure reinforcing rib 5 improves the bending resistance of the TPE tight sleeve layer 4 in the axial direction.

[0031] The metal spiral armor type temperature sensing optical cable provided in the utility model has optical attenuation ≤0.40dB / km (1310nm);The short-term allowable tensile force is greater than 1500N, and the long-term is greater than 750N;The allowable flattening force is greater than 3000N / 10cm in the short term and greater than 1000N / 10cm in the long term;The minimum bending radius is static 10D (D is the diameter of the optical cable) and dynamic 20D (D is the diameter of the optical cable);The application temperature is-40℃-+85℃;Therefore, it has high mechanical properties, UV aging resistance, waterproofness, and is suitable for buried, hanging net, pipeline and other laying modes;And the hardness of the optical cable is moderate, and the laying and construction are convenient;The optical cable has small loss and is suitable for long-distance BOTDR (or BOTDA) optical fiber sensing application.

[0032] The above-described embodiments are merely preferred embodiments of the present application, and are not intended to limit the design concept and scope of the present application. Without departing from the design concept of the present application, various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art shall fall within the protection scope of the present application, and the technical content of the present application claimed for protection has been entirely recorded in the claims.

Claims

1. A metal spiral armored temperature sensing optical cable, characterized in that, include: optical fiber; PBT bundle tubes are placed on the outer layer of optical fibers; The NTE temperature compensation layer has a negative coefficient of thermal expansion and is tightly attached to the inner wall of the PBT bundle tube. A stranded steel wire layer is placed on the outer layer of the PBT bundle tube; The wrapping layer is tightly wrapped around the outer layer of stranded steel wire; The PE outer sheath layer is located outside the wrapping layer; The space between the optical fiber and the PBT bundle tube is filled with grease.

2. The metal spiral armored temperature sensing optical cable according to claim 1, characterized in that, The optical fiber is a colored optical fiber with a diameter of 0.25mm, and there are 1-5 optical fibers.

3. The metal spiral armored temperature sensing optical cable according to claim 1, characterized in that, The outer PE sheath is made of MDPE material with a nominal thickness of 1.0mm and an outer diameter of 5.0mm ± 0.2mm.

4. The metal spiral armored temperature sensing optical cable according to claim 1, characterized in that, The stranded steel wire layer is made of 0.6mm stainless steel wire.

5. The metal spiral armored temperature sensing optical cable according to claim 1, characterized in that, The PBT bundle is a polybutylene terephthalate bundle with a diameter of 1.8 mm.

6. The metal spiral armored temperature sensing optical cable according to claim 1, characterized in that, A TPE tight-fitting layer is provided between the PBT bundle tube and the stranded steel wire layer, and multiple structural reinforcing ribs extending axially are evenly distributed in the inner circumference of the TPE tight-fitting layer.

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