Self-heating temperature sensing optical cable

Abstract

The utility model relates to the technical field of special optical cables, in particular to a self-heating temperature-sensing optical cable, which comprises a temperature-sensing optical fiber. The HDPE inner sheath wraps the outside of the temperature sensing optical fiber; the plurality of RV wire cores are circumferentially arranged outside the HDPE inner sheath in a surrounding manner; the HDPE outer sheath is wrapped outside the RV wire core; the plurality of heat transfer assemblies are distributed between the outer surface of the HDPE inner sheath and the outer surface of the HDPE outer sheath; by arranging the RV wire core, the optical cable and the surrounding environment of the optical cable can be kept in a known and stable initial temperature state, the temperature change caused by water seepage can be detected more accurately, the temperature measurement precision reaches + / -1 DEG C, and the accuracy of temperature measurement is ensured; a plurality of layers of thin steel wire meshes and heat transfer ropes are introduced as heat transfer assemblies, so that the heat transfer efficiency inside and outside the optical cable is effectively improved, the temperature-sensitive optical fiber can respond to temperature change more quickly, and the sensitivity of the system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to special optical cable technical field, concretely relates to a self -heating temperature sensing optical cable. BACKGROUND

[0002] In the water conveyance tunnel, the temperature sensing optical cable is arranged on the top and side wall of the tunnel for leakage monitoring, one end of the optical cable is connected with the distributed temperature measuring device and the temperature controller for data acquisition, and finally the two monitoring devices are connected through the communication network to transmit data to the industrial computer for data analysis, so that the temperature change caused by water seepage can be effectively collected; the traditional temperature monitoring method has limitations such as inaccurate measurement, slow response speed and easy interference. The optical fiber temperature measurement technology can overcome these problems and has the advantages of high-precision measurement, real-time monitoring, fast response and strong anti-interference ability, but the existing temperature sensing optical cable has unsatisfactory sensing accuracy, response speed and sensitivity to temperature changes caused by water seepage in the tunnel. SUMMARY

[0003] I. Technical problems to be solved

[0004] The utility model discloses a kind of self-heating temperature sensing optical cables, temperature measuring precision is high, sensing temperature sensitivity is high.

[0005] II. Technical solutions

[0006] The utility model discloses the following technical solutions are realized:

[0007] The utility model provides a kind of self-heating temperature sensing optical cable, comprising:

[0008] Temperature sensing optical fiber;

[0009] HDPE inner sheath, wrapped in temperature sensing optical fiber outside;

[0010] Multiple RV wire cores, circumferentially surround HDPE inner sheath outside;

[0011] HDPE outer sheath, wrapped in RV wire core outside;

[0012] A plurality of heat transfer components are distributed between the outer surface of the HDPE inner sheath and the outer surface of the HDPE outer sheath.

[0013] Further, the heat transfer component includes a plurality of thin steel wire meshes, the HDPE outer sheath is a multi-layer nested structure, and the thin steel wire mesh is tightly covered between adjacent layers of HDPE outer sheaths.

[0014] Further, the heat transfer component includes a plurality of heat transfer ropes arranged along the axial direction.

[0015] Further, the heat transfer rope is arranged in the gap between the RV core, the HDPE outer sheath and the HDPE inner sheath.

[0016] Further, the heat transfer rope is uniformly embedded in the HDPE outer sheath in the circumferential direction and has multiple layers in the radial direction.

[0017] Further, the gap between the HDPE outer sheath and the RV core is tightly arranged with aramid ropes.

[0018] Further, the inside of the HDPE inner sheath is provided with a stainless steel pipe, and the stainless steel pipe is filled with ointment between the temperature sensing optical fiber.

[0019] Three, beneficial effects

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1, the utility model discloses a RV core can keep the optical cable and its surrounding environment in a known and stable initial temperature state, more accurately detect the temperature change caused by water seepage, the temperature measurement accuracy reaches ±1 DEG C, ensures the accuracy of temperature measurement;

[0022] 2, introduce multilayer thin steel wire net and heat transfer rope as heat transfer assembly, effectively improve the heat transfer efficiency inside and outside the optical cable, make the temperature sensing optical fiber can respond to temperature change faster, improve the sensitivity of system. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is one embodiment of the utility model;

[0024] Figure 2 is another embodiment of the utility model;

[0025] 1, temperature sensing optical fiber;2, stainless steel pipe;3, ointment;4, HDPE inner sheath;5, RV core;6, HDPE outer sheath;7, heat transfer assembly;71, thin steel wire net;72, heat transfer rope;8, aramid rope. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the following will be further detailed with the utility model by combining with the drawings and examples.It should be understood that the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0027] A self-heating temperature sensing optical cable, please refer to Figure 1, including temperature sensing fiber 1, HDPE inner sheath 4, multiple RV wire cores 5, HDPE outer sheath 6 and several heat transfer components 7; wherein the thickness of the HDPE outer sheath 6 is 1.7mm, and the outer diameter is 13.2mm; the thickness of the HDPE inner sheath 4 is 0.5mm, and the outer diameter is 3.2mm; the temperature sensing fiber 1 is a 2-core A1b colored fiber, and the temperature measurement accuracy is ±1℃; the RV wire core 5 is a 1.5mm^2, Φ3.2mm wire core, and there are 6 RV wire cores 5, which form two groups of three-item heating lines;

[0028] The HDPE inner sheath 4 is wrapped outside the temperature sensing fiber 1; the multiple RV wire cores 5 are circumferentially surrounded outside the HDPE inner sheath 4; the HDPE outer sheath 6 is wrapped outside the RV wire cores 5; and the heat transfer components 7 are distributed between the outer surface of the HDPE inner sheath 4 and the outer surface of the HDPE outer sheath 6.

[0029] The optical cable is laid in the engineering tunnel and surrounded by concrete or other materials. When external water seeps in, the change in environmental temperature will cause a change in the temperature inside the optical fiber. Based on Raman scattering, the intensity of scattered light will change with temperature, affecting the characteristics of scattered light, thereby determining the location of temperature anomalies caused by seepage. The heating temperature of the RV wire core 5 is 40-50℃, and the current is controlled at about 10A during heating. Each heating time is 30 minutes. The RV wire core 5 heating controls the optical cable and its surrounding environment to be in a known, stable initial temperature state, more accurately detecting any temperature changes caused by water seepage.

[0030] In one embodiment, referring to Figure 1 , the heat transfer component 7 includes multiple layers of thin steel wire mesh 71, the HDPE outer sheath 6 has a multi-layer nested structure, and the thin steel wire mesh 71 is tightly wrapped between adjacent layers of the HDPE outer sheath 6. The heat transfer component 7 also includes several heat transfer ropes 72 arranged in the axial direction. The heat transfer rope 72 can be a Φ0.6mm steel wire, and the heat transfer rope 72 is arranged in the gap between the RV wire core 5, the HDPE outer sheath 6 and the HDPE inner sheath 4. By arranging multiple layers of thin steel wire mesh 71 and heat transfer ropes 72, the heat transfer speed inside and outside the optical cable is strengthened, and the response speed and response sensitivity of the temperature sensing fiber 1 to water seepage are accelerated.

[0031] In another embodiment, referring to Figure 2 , the heat transfer component 7 includes several heat transfer ropes 72 arranged in the axial direction. Part of the heat transfer ropes 72 are arranged in the gap between the RV wire core 5, the HDPE outer sheath 6 and the HDPE inner sheath 4; and part of the heat transfer ropes 72 are uniformly embedded in the HDPE outer sheath 6 in the circumferential direction and have multiple layers in the radial direction. The heat transfer capacity of the HDPE outer sheath 6 is strengthened by replacing the thin steel wire mesh 71 with the heat transfer ropes 72.

[0032] In the embodiment, the aramid rope 8 is closely arranged in the gap between the HDPE outer sheath 6 and the RV core 5, so that the flexibility and tensile strength are improved.

[0033] In addition, the Φ2.2mm stainless steel pipe 2 is arranged in the HDPE inner sheath 4, and the oil paste 3 is filled between the stainless steel pipe 2 and the temperature sensing optical fiber 1, so that the temperature sensing optical fiber 1 is protected and the heat transfer capacity is improved.

[0034] The above-described embodiments are only used to describe the preferred embodiments of the present application, and are not used to limit the design concept and scope of the present application. Any modification and improvement of the technical scheme of the present application made by those skilled in the art without departing from the design concept of the present application shall fall into the protection scope of the present application, and the technical content of the present application claimed for protection has been recorded in the claims.

Claims

1. A self-heating temperature-sensing optical cable, characterized by The temperature sensing fiber is wrapped by an HDPE inner sheath, and a plurality of RV cores are circumferentially arranged outside the HDPE inner sheath, and an HDPE outer sheath is arranged outside the RV cores. The heat transfer assembly comprises a plurality of layers of thin steel wire meshes, and the HDPE outer sheath is a multi-layer nested structure, and the thin steel wire meshes are tightly wrapped between adjacent layers of the HDPE outer sheaths. The heat transfer assembly comprises a plurality of heat transfer ropes arranged in the axial direction. The heat transfer ropes are arranged in the gap between the RV cores, the HDPE outer sheath and the HDPE inner sheath. The heat transfer ropes are uniformly embedded in the HDPE outer sheath in the circumferential direction and have a plurality of layers in the radial direction. A para-aramid rope is tightly arranged in the gap between the HDPE outer sheath and the RV cores.

2. A self-heating temperature-sensing optical cable according to claim 1, characterized in that, A stainless steel pipe is arranged inside the HDPE inner sheath, and the stainless steel pipe and the temperature sensing fiber are filled with an ointment.

3. A self-heating temperature-sensing optical cable according to claim 1 or 2, characterized in that ​ 4. A self-heating temperature-sensing optical cable according to claim 3, characterized in that, ​ 5. A self-heating temperature-sensing optical cable according to claim 3, wherein ​ 6. A self-heating temperature-sensing optical cable according to claim 1, wherein ​ 7. A self-heating temperature-sensing optical cable according to claim 1, wherein ​

Images