Sensing optical cable and manufacturing process thereof

Abstract

The invention relates to the technical field of optical fiber sensing monitoring, in particular to a sensing optical cable and a manufacturing process thereof. The sensing optical cable comprises a first sensing optical fiber, a second sensing optical fiber, two reinforcing layers and a protective layer. Wherein the second sensing optical fiber and the first sensing optical fiber are arranged at an interval; the two reinforcing layers wrap the first sensing optical fiber and the second sensing optical fiber in a one-to-one correspondence manner, the first sensing optical fiber is in transition fit with the corresponding reinforcing layer, and the second sensing optical fiber is in clearance fit with the corresponding reinforcing layer; and the protective layer is coated outside the two reinforcing layers. According to the sensing optical cable, the defect that the sensing optical cable in the prior art is poor in strain resistance and temperature change resistance is overcome, the sensing optical cable with the high strain resistance and temperature change resistance is achieved, and therefore the performance of the sensing optical cable is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber sensing and monitoring technology, and in particular to a sensing optical cable and a manufacturing process thereof. Background Art

[0002] Fiber optic sensing monitoring technology is a technology that uses optical fiber as a sensing medium to obtain information about the object being measured by measuring changes in the optical fiber itself or the surrounding environment. This technology has the advantages of anti-electromagnetic interference, corrosion resistance, high precision, and long-distance transmission, and is widely used in monitoring in various fields. Among them, strain and temperature are two very important monitoring parameters, which are of great significance to ensure the safety and stability of the structure. The existing sensor optical cables have poor resistance to strain and temperature changes, which greatly affects the performance of the sensor optical cables. Summary of the invention

[0003] The present invention provides a sensing optical cable and a manufacturing process thereof, which are used to solve the defects of the sensing optical cable in the prior art in that the sensing optical cable has poor strain resistance and temperature change resistance, and realize a sensing optical cable with strong strain resistance and temperature change resistance, thereby greatly improving the performance of the sensing optical cable.

[0004] The present invention provides a sensing optical cable, comprising: A first sensing optical fiber; A second sensing optical fiber is spaced apart from the first sensing optical fiber; Two reinforcement layers are coated on the outside of the first sensing optical fiber and the second sensing optical fiber in a one-to-one correspondence, the first sensing optical fiber is transitionally matched with the corresponding reinforcement layer, and the second sensing optical fiber is gap-matched with the corresponding reinforcement layer; The protective layer is coated on the outside of the two reinforcement layers.

[0005] According to a sensor optical cable provided by the present invention, the reinforcement layer comprises: An inner sheath, wherein the first sensing optical fiber and the second sensing optical fiber are arranged inside the corresponding inner sheath; A stainless steel armor tube is coaxially arranged with the inner sheath and covers the outer part of the inner sheath; The metal braided layer is coaxially arranged with the stainless steel armored tube and coated on the outside of the stainless steel armored tube. The protective layer is coated on the outside of the two metal braided layers, and the protective layer and the stainless steel armored tube are transitionally matched with the metal braided layer.

[0006] According to a sensing optical cable provided by the present invention, when the inner sheath is covered on the outside of the first sensing optical fiber, the corresponding stainless steel armor tube and the inner sheath are fixedly connected; When the inner sheath is covered on the second sensing optical fiber, the corresponding stainless steel armor tube and the inner sheath are gap-matched.

[0007] According to a sensing optical cable provided by the present invention, the protective layer is assembled by stacking and pressing a plurality of protective sheets in sequence.

[0008] According to a sensing optical cable provided by the present invention, the protective layer includes a polyimide protective layer.

[0009] According to a sensing optical cable provided by the present invention, the inner sheath comprises a polyimide inner sheath.

[0010] According to a sensing optical cable provided by the present invention, the first sensing optical fiber includes a single-mode modified polyimide optical fiber.

[0011] According to a sensing optical cable provided by the present invention, the second sensing optical fiber includes a multi-mode modified polyimide optical fiber.

[0012] According to a sensing optical cable provided by the present invention, when the inner sheath is coated on the outside of the first sensing optical fiber, the corresponding stainless steel armor tube and the inner sheath are intermittently connected by glue or glass welding.

[0013] A sensing optical cable provided according to the present invention comprises: The inner sheath is coated on the outside of the first sensing optical fiber and the second sensing optical fiber to form a corresponding coating body; Sleeve the stainless steel armored tube on the outside of the corresponding sheath; A metal braid is woven on the outside of the stainless steel armor tube; Wrap the protective layer over the outside of the two metal braid layers.

[0014] The sensing optical cable provided by the present invention provides good mechanical support by closely contacting the first sensing optical fiber with the reinforcement layer, thereby reducing deformation caused by external pressure or stretching. The clearance fit allows the second sensing optical fiber to have a certain movement space in the reinforcement layer. When the temperature changes and causes the material to expand and contract, such a design can alleviate the internal stress generated thereby and prevent the optical fiber from being damaged due to excessive constraints.

[0015] The application of the protective layer further enhances the overall protection of the optical cable, not only providing a barrier to external physical damage, but also helping to maintain the stability of the internal structure of the optical cable, and maintaining good performance even under temperature fluctuations. Therefore, overall, this design of sensor optical cable has stronger adaptability and stability when facing strain and temperature changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of the sensor optical cable provided by the present invention.

[0018] Reference numerals: 100: first sensing optical fiber; 200: second sensing optical fiber; 300: reinforcement layer; 310: inner sheath; 320: stainless steel armor tube; 330: metal braided layer; 400: protective layer. DETAILED DESCRIPTION

[0019] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0021] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0022] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0024] Combine the following Figure 1 Various embodiments of the invention are described.

[0025] Reference Figure 1 The present invention provides a sensing optical cable comprising a first sensing optical fiber 100, a second sensing optical fiber 200, two reinforcement layers 300 and a protective layer 400. The second sensing optical fiber 200 is spaced apart from the first sensing optical fiber 100; the two reinforcement layers 300 are coated on the outside of the first sensing optical fiber 100 and the second sensing optical fiber 200 in a one-to-one correspondence, the first sensing optical fiber 100 is transitionally matched with the corresponding reinforcement layer 300, and the second sensing optical fiber 200 is gap-matched with the corresponding reinforcement layer 300; the protective layer 400 is coated on the outside of the two reinforcement layers 300. The protective layer 400 comprises a polyimide protective layer 400. The first sensing optical fiber 100 comprises a single-mode modified polyimide optical fiber, specifically, the first sensing optical fiber 100 can be a 9 / 125 single-mode modified polyimide optical fiber (i.e., the core diameter of the first sensing optical fiber 100 is 9 microns (μm), and the cladding diameter is 125 μm). The second sensing optical fiber 200 includes a multi-mode modified polyimide optical fiber. Specifically, the second sensing optical fiber 200 may be a 50 / 125 or 62.5 / 125 multi-mode modified polyimide optical fiber that is resistant to high and low temperatures.

[0026] In the above structure, the first sensing optical fiber 100 and the second sensing optical fiber are arranged at a certain interval to ensure their respective working independence. A reinforcement layer 300 is arranged around each sensing optical fiber, wherein the first sensing optical fiber 100 and the reinforcement layer 300 outside it are transitionally matched, while the second sensing optical fiber and the corresponding reinforcement layer 300 are gap matched. This design allows the two sensing optical fibers to cope with the differences in stress distribution under different conditions, thereby optimizing their respective mechanical stability. In addition, in order to provide additional protection and integrate the entire structure, a protective layer 400 is arranged outside the two reinforcement layers 300 to wrap them up uniformly. This structure not only enhances the physical protection of the sensing optical cable, but also helps to improve its ability to resist changes in the external environment.

[0027] Specifically, the transition fit can ensure that under normal working conditions, the first sensing optical fiber 100 and the reinforcement layer 300 are in close contact, thereby providing good mechanical support and reducing deformation caused by external pressure or stretching. The clearance fit allows the second sensing optical fiber to have a certain amount of movement space in the reinforcement layer 300. When temperature changes cause the material to expand and contract, such a design can alleviate the resulting internal stress and prevent optical fiber damage caused by excessive constraints.

[0028] In addition, the application of the protective layer 400 further enhances the overall protection of the optical cable, not only providing a barrier to external physical damage, but also helping to maintain the stability of the internal structure of the optical cable, and maintaining good performance even under temperature fluctuations. Therefore, overall, the sensor optical cable of this design has stronger adaptability and stability when facing strain and temperature changes.

[0029] In some possible embodiments, in order to further improve the performance of the sensor optical cable protective layer 400, the design of the protective layer 400 should consider multiple aspects such as material selection, structural optimization, and function enhancement to ensure its durability, stability, and functionality in complex and extreme environments.

[0030] First, in terms of material selection, the protective layer 400 should use composite materials with excellent mechanical properties, chemical corrosion resistance, UV radiation resistance and wide temperature range adaptability as the basic material. For example, polyimide should be one of the ideal choices due to its excellent thermal stability, electrical insulation and chemical inertness. In addition, self-healing material technology should be introduced into the protective layer 400 so that the protective layer 400 can automatically repair surface cracks or scratches when slightly damaged, thereby extending the service life of the optical cable. At the same time, environmentally friendly materials should be given priority to ensure low pollution emissions during the production process, and the products should be easy to recycle and reuse, in line with the requirements of modern society for sustainable development.

[0031] In terms of structural optimization, the protective layer 400 should adopt a multi-layer composite structure design, and each layer should select materials with different characteristics according to its specific function. The innermost layer should be a bonding layer with good adhesion to ensure close bonding with the internal reinforcement layer 300; the middle layer should be a hard shell that provides the main physical protection, using high-strength, high-modulus materials; the outermost layer should be a functional layer with special protective properties (such as moisture-proof and corrosion-resistant). This layered design can maximize the external protection effect without affecting the internal optical fiber performance. In order to meet the needs of curved laying while maintaining the necessary mechanical strength, an appropriate amount of flexible fillers or fiber-reinforced materials should be added to the protective layer 400 to achieve the best balance between flexibility and rigidity, which is convenient for installation and operation, and will not affect the overall performance of the optical cable due to excessive hardening.

[0032] In addition, in order to further enhance the function of the protective layer 400, electromagnetic shielding characteristics should be integrated into the design. Considering the strong electromagnetic interference problem that may exist in some application scenarios, elements such as metal mesh or conductive coatings should be added to the protective layer 400 to form an effective electromagnetic shielding layer to protect the internal electronic components from the influence of external electromagnetic waves and ensure the accuracy and reliability of data transmission. In addition, phase change materials (PCM) or other forms of thermal management mechanisms should be integrated inside the protective layer 400 to enable the optical cable to maintain a relatively constant temperature within a wide operating temperature range and avoid performance fluctuations caused by drastic temperature differences. PCM absorbs or releases heat during the heat absorption and heat release process, plays a buffering role, and reduces the impact of temperature changes on the performance of the optical cable.

[0033] In terms of manufacturing process, the preparation of the protective layer 400 should adopt precision extrusion molding technology, using advanced extrusion equipment and technology to accurately control the fluidity and solidification rate of the material in the molten state, to ensure that each layer of protective material is evenly covered and tightly fitted. Especially for multi-layer composite structures, it should be ensured that there are no gaps or bubbles between the layers to avoid affecting the overall protective effectiveness. A highly automated production line should be established to achieve unmanned operation from raw material preparation to final finished product inspection. This should not only improve production efficiency, but also ensure the consistency and stability of product quality. For example, in the application link of the metal braided layer 330, the robot arm should be programmed to complete the precise winding task; and in the final sheath covering stage, an intelligent extrusion device should be used to adjust the mold shape and control the cross-sectional size.

[0034] Reference Figure 1In some embodiments of the present invention, the reinforcement layer 300 includes an inner sheath 310, a stainless steel armor tube 320 and a metal braided layer 330. The first sensing optical fiber 100 and the second sensing optical fiber 200 are arranged inside the corresponding inner sheath 310; the stainless steel armor tube 320 is coaxially arranged with the inner sheath 310 and coated on the outside of the inner sheath 310; the metal braided layer 330 is coaxially arranged with the stainless steel armor tube 320 and coated on the outside of the stainless steel armor tube 320, and the protective layer 400 is coated on the outside of the two metal braided layers 330, and the protective layer 400 and the stainless steel armor tube 320 are transitionally matched with the metal braided layer 330. When the inner sheath 310 is coated on the outside of the first sensing optical fiber 100, the corresponding stainless steel armor tube 320 and the inner sheath 310 are intermittently connected by glue or glass welding. The inner sheath 310 includes a polyimide inner sheath 310.

[0035] In the above structure, the first sensing optical fiber 100 and the second sensing optical fiber are respectively arranged inside the corresponding inner sheath 310, ensuring that the two optical fibers work in their own independent and protected environments. The inner sheath 310 not only provides preliminary physical protection, but also enhances the strain transmission efficiency and reduces the influence of external stress on the optical fiber by closely fitting with the optical fiber (transition fit for the first sensing optical fiber 100 and clearance fit for the second sensing optical fiber).

[0036] The stainless steel armor tube 320 is coaxially arranged with the inner sheath 310 and is coated on the outside of the inner sheath 310, forming a second layer of protection. The existence of the stainless steel armor tube 320 greatly increases the overall tensile, bending and torsion resistance of the optical cable. At the same time, the close contact between it and the inner sheath 310 ensures the effective transmission of force, so that the sensing optical fiber can more accurately reflect the strain applied by the outside. In addition, the stainless steel armor tube 320 is connected to the inner sheath 310 of the first sensing optical fiber 100 through high and low temperature resistant glue or low temperature glass welding technology, ensuring the stability and sealing of the connection, while the inner sheath 310 of the second sensing optical fiber can move freely inside the stainless steel armor tube 320, reducing the influence of temperature changes on external stress measurement.

[0037] Furthermore, the metal braided layer 330 is coaxially arranged with the stainless steel armor tube 320 and is coated on the outside of the stainless steel armor tube 320, forming a third layer of protection. The metal braided layer 330 not only enhances the tensile strength of the optical cable, but also improves the flexibility and shear resistance of the optical cable through its unique mesh structure. The metal braided layer 330, the stainless steel armor tube 320 and the protective layer 400 achieve a transition fit, ensuring that the layers are both tight and do not interfere with each other, thereby effectively dispersing external forces and maintaining the integrity of the overall structure. This design helps to protect internal components from external mechanical damage while maintaining the necessary flexibility of the optical cable for easy installation and laying.

[0038] Combined with the structural design of the above-mentioned sensing optical cable, the application of high and low temperature resistant glue and low temperature glass welding technology provides significant advantages for the connection between the stainless steel armor tube 320 and the first inner sheath 310 of the first sensing optical fiber 100. In the present invention, in order to ensure the stability and durability of the entire composite optical cable under extreme temperature conditions, the selection of these two technologies is based on their reliable performance in a wide temperature range and their adaptability to complex environments.

[0039] In this embodiment, for the first sensing optical fiber 100, the inner sheath 310 and the stainless steel armor tube 320 are connected by high and low temperature resistant glue or low temperature glass welding technology. High and low temperature resistant glue can maintain its bonding strength and elasticity in the range of extremely low temperature to high temperature. This characteristic enables good mechanical properties to be maintained even under extreme temperature conditions. Due to its excellent chemical stability, high and low temperature resistant glue is not easily corroded by solvents, acids, alkalis and other chemical substances, thereby ensuring reliability in long-term use. At the same time, the glue has appropriate flexibility, which can avoid brittle cracking caused by temperature changes in low temperature environments, which provides additional protection for the optical cable and ensures its working performance in complex environments.

[0040] For application scenarios that require higher connection strength and more stringent sealing requirements, low-temperature glass welding technology can be used between the inner sheath 310 and the stainless steel armor tube 320. By selecting a specific type of glass as an intermediate medium, a permanent connection between metal and non-metallic materials is achieved at a relatively low temperature. This method not only provides a strong mechanical bond, but also ensures the airtightness and waterproofness of the connection. During the low-temperature glass welding process, the selection of glass material should consider good thermal expansion matching with the stainless steel armor tube 320 and the polyimide inner sheath 310 to reduce stress concentration caused by temperature changes. In addition, precise control of the heating temperature and time can ensure that the glass is fully melted and forms a strong metallurgical bond with the contact surface, while avoiding thermal damage to surrounding components.

[0041] These two connection technologies work together between the stainless steel armor tube 320 and the first inner sheath 310 of the first sensing optical fiber 100 to ensure a tight and stable bond. Their advantages are that they can adapt to a wide temperature range, provide reliable mechanical support, and maintain stable performance in long-term use. Whether using high and low temperature resistant glue or low temperature glass welding, it can effectively enhance the overall structural strength of the optical cable, ensure its stability and durability under extreme temperature conditions, and thus provide reliable performance guarantee for the sensing optical cable in complex environments.

[0042] Reference Figure 1In some embodiments of the present invention, when the inner sheath 310 is covered on the outside of the first sensing optical fiber 100, the corresponding stainless steel armor tube 320 and the inner sheath 310 are fixedly connected; when the inner sheath 310 is covered on the second sensing optical fiber 200, the corresponding stainless steel armor tube 320 and the inner sheath 310 are gap-fitted.

[0043] In this embodiment, the first sensing optical fiber 100 is mainly used for strain measurement, so it is necessary to ensure its effective transmission with external stress. By fixedly connecting the stainless steel armor tube 320 with the inner sheath 310 of the first sensing optical fiber 100, close contact between the two can be ensured, thereby achieving effective transmission of force. This fixed connection not only enhances the overall tensile, bending and torsion resistance of the optical cable, but also enables the first sensing optical fiber 100 to more accurately reflect the actual strain conditions borne by the structure. The fixed connection adopts high and low temperature resistant glue or low temperature glass welding technology to ensure that the connection parts still maintain good mechanical properties and sealing under extreme temperature conditions, and prevent the external environment from affecting the internal components.

[0044] The second sensing optical fiber is mainly used for temperature measurement, and it is required to reduce the interference of external mechanical stress on its measurement results. For this reason, a clearance fit design is adopted between the inner sheath 310 of the second sensing optical fiber and the stainless steel armor tube 320. Such a setting allows the second sensing optical fiber to have a certain amount of free movement space in its inner sheath 310. When temperature changes cause the material to expand or contract, the internal stress generated thereby can be effectively alleviated, and fiber damage caused by excessive constraints can be avoided. The clearance fit design ensures that the second sensing optical fiber can work in an environment that is relatively independent and not affected by external mechanical stress, thereby improving the accuracy and reliability of temperature measurement.

[0045] Reference Figure 1 In some embodiments of the present invention, the protective layer 400 is assembled by stacking a plurality of protective sheets in sequence. Specifically, the plurality of protective sheets can be stacked and assembled in the arrangement of fish scales. Such an arrangement can increase the flexibility of the present invention.

[0046] The present invention also provides a manufacturing process of a sensor optical cable, comprising the following steps: S1. Wrap the inner sheath 310 on the outside of the first sensing optical fiber 100 and the second sensing optical fiber 200 to form a corresponding coating. Specifically, firstly, heat and melt the polyimide plastic particles into a plastic fluid through an extrusion device, and place the first sensing optical fiber 100 and the second sensing optical fiber 200 into the corresponding extrusion devices respectively. By controlling the aperture and pressure to change the coupling degree of the sensing optical fiber, an inner sheath 310 with a tight structure and an inner sheath 310 with a loose structure are formed. The inner sheath 310 and the first sensing optical fiber 100, the inner sheath 310 and the second sensing optical fiber 200 form different coatings.

[0047] S2. Sleeve the stainless steel armor tube 320 on the outside of the corresponding sheath; specifically, insert the sheath into the corresponding stainless steel armor tube 320 respectively, and implant low-temperature resistant structural adhesive or perform low-temperature glass welding between the inner sheath 310 and the sheath of the first sensing optical fiber 100 and the stainless steel armor tube 320 at intervals of 2m, 3m or 5m.

[0048] S3. Weaving a metal braided layer 330 on the outside of the stainless steel armor tube 320; specifically, using a wire twisting machine to weave the metal braided layer 330 on the outside of the stainless steel armor tube 320, and adjusting the density of the metal braided layer 330 by controlling the forward speed, which is generally controlled at 1 cm-5 cm / s.

[0049] S4, wrap the protective layer 400 on the outside of the two metal braided layers 330. Place two stainless steel armor tubes 320 woven with metal braided layers 330 side by side, and use an extrusion device to cover them with a layer of polyimide protective layer 400. By controlling the shape of the extrusion device mold, the cross-sectional size of the composite optical cable is controlled.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sensor optical cable, characterized in that: include: A first sensing optical fiber (100); A second sensing optical fiber (200) is arranged at a distance from the first sensing optical fiber (100); Two reinforcement layers (300) are coated on the outside of the first sensing optical fiber (100) and the second sensing optical fiber (200) in a one-to-one correspondence, the first sensing optical fiber (100) and the corresponding reinforcement layer (300) are transitionally matched, and the second sensing optical fiber (200) and the corresponding reinforcement layer (300) are gap matched; The protective layer (400) is coated on the outside of the two reinforcement layers (300).

2. The sensor optical cable according to claim 1, characterized in that: The reinforcement layer (300) comprises: An inner sheath (310), wherein the first sensing optical fiber (100) and the second sensing optical fiber (200) are arranged inside the corresponding inner sheath (310); A stainless steel armor tube (320) is coaxially arranged with the inner sheath (310) and covers the outside of the inner sheath (310); The metal braided layer (330) is coaxially arranged with the stainless steel armored tube (320) and is coated on the outside of the stainless steel armored tube (320); the protective layer (400) is coated on the outside of the two metal braided layers (330); and the protective layer (400) and the stainless steel armored tube (320) are both transitionally matched with the metal braided layer (330).

3. The sensing optical cable according to claim 2, characterized in that: When the inner sheath (310) is coated on the outside of the first sensing optical fiber (100), the corresponding stainless steel armor tube (320) and the inner sheath (310) are fixedly connected; When the inner sheath (310) is coated on the second sensing optical fiber (200), the corresponding stainless steel armor tube (320) and the inner sheath (310) are clearance-matched.

4. The sensor optical cable according to any one of claims 1 to 3, characterized in that: The protective layer (400) is assembled by stacking a plurality of protective sheets in sequence.

5. The sensing optical cable according to claim 4, characterized in that: The protective layer (400) comprises a polyimide protective layer.

6. The sensing optical cable according to claim 2, characterized in that: The inner sheath (310) comprises a polyimide inner sheath.

7. The sensing optical cable according to any one of claims 1 to 3, characterized in that: The first sensing optical fiber (100) comprises a single-mode modified polyimide optical fiber.

8. The sensing optical cable according to claim 1, characterized in that: The second sensing optical fiber (200) comprises a multimode modified polyimide optical fiber.

9. The sensing optical cable according to claim 2, characterized in that: When the inner sheath (310) is coated on the outside of the first sensing optical fiber (100), the corresponding stainless steel armor tube (320) and the inner sheath (310) are intermittently connected by glue or glass welding.

10. A manufacturing process for a sensor optical cable, characterized in that: include: The inner sheath (310) is coated on the outside of the first sensing optical fiber (100) and the second sensing optical fiber (200) to form corresponding coatings; Sleeve the stainless steel armor tube (320) on the outside of the corresponding covering body; Weaving a metal braid layer (330) on the outside of the stainless steel armor tube (320); The protective layer (400) is wrapped around the outside of the two metal braided layers (330).

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