A distributed fiber temperature measurement sensing optical cable

Abstract

This utility model relates to a distributed optical fiber temperature sensing cable, comprising a temperature sensing cable and further comprising: a sensing fiber core, a thermosensitive layer, a tight-packing layer, a reinforcement structure, a first buffer layer, a second buffer layer, and an outer jacket layer. A thermosensitive layer is fixedly disposed on the outer wall of the sensing fiber core, and a tight-packing layer is fixedly disposed on the outer wall of the thermosensitive layer. The reinforcement layer of this application is armored with a stainless steel spiral tube, with a reinforcing rod supported within the reinforcement layer, which further enhances the compressive strength of the inner sensing fiber core, effectively increasing the compressive and bending strength of the temperature sensing cable and preventing breakage of the inner sensing fiber core due to excessive bending or external pressure. The buffer layer is made of thermoplastic polyester elastomer, which effectively prevents fiber breakage or signal distortion and can effectively resist construction traction and dynamic deformation.

Description

Technical Field

[0001] This utility model relates to the field of optical fiber sensing technology, specifically to a distributed optical fiber temperature sensing cable. Background Technology

[0002] Fiber optic temperature measurement is a technology that uses fiber optic sensors to transmit temperature information via optical signals. Its core principles include Raman scattering, fluorescence decay time, and fluorescence lifetime. Fiber optic temperature measurement technology has many advantages, such as high precision, long-distance monitoring, and resistance to electromagnetic interference, making it widely used in industries such as industry, energy, transportation, and construction.

[0003] In distributed fiber optic temperature sensing cables, optical fibers not only serve as the transmission medium but also as the sensing element, enabling real-time and continuous monitoring of temperature information at various points along the cable. However, conventional temperature sensing cables lack sufficient mechanical strength, and the optical fibers inside are prone to breakage due to excessive bending or external pressure, making their use and deployment inconvenient. Utility Model Content

[0004] This utility model addresses the technical problems existing in the prior art by providing a distributed optical fiber temperature sensing cable.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: it includes a temperature sensing optical cable, and further includes: the temperature sensing optical cable is composed of a sensing fiber core, a thermosensitive layer, a tight-closing layer, a reinforcement structure, a first buffer layer, a second buffer layer and an outer jacket layer. A thermosensitive layer is fixedly disposed on the outer side wall of the sensing fiber core, a tight-closing layer is fixedly disposed on the outer side wall of the thermosensitive layer, a reinforcement structure is disposed on the outer side wall of the tight-closing layer, a first buffer layer is disposed on the inner side of the reinforcement structure, a second buffer layer is disposed on the outer side of the reinforcement structure, and an outer jacket layer is disposed on the outer side of the second buffer layer.

[0006] The beneficial effects of this utility model are as follows: The stainless steel spiral tube of this application has good compressive and bending resistance. The reinforcing layer is armored with a stainless steel spiral tube, which enhances the compressive and bending resistance of the inner sensing fiber core. The reinforcing rod is supported within the reinforcing layer, which can further enhance the compressive resistance of the inner sensing fiber core. This facilitates better enhancement of the compressive and bending strength of the temperature sensing optical cable, preventing the inner sensing fiber core from breaking due to excessive bending or external pressure. The thermoplastic polyester elastomer has excellent bending fatigue resistance, excellent impact resistance, and high resilience. The buffer layer is made of thermoplastic polyester elastomer, which can absorb the micro-stress generated by external pressure and bending, effectively preventing fiber breakage or signal distortion, and can effectively resist construction traction and dynamic deformation.

[0007] Preferably, the thermosensitive layer is made of polyimide coating. Polyimide coating is a high-performance coating using polyimide resin as the film-forming material, possessing excellent heat resistance, electrical insulation, mechanical properties, and chemical stability. Polyimide-coated optical fibers can operate stably for extended periods within a temperature range of -190℃ to 300℃ and can withstand short-term high temperatures up to 400℃. Its coefficient of thermal expansion is well-matched with the cladding of quartz optical fibers. Using a polyimide coating for the thermosensitive layer effectively reduces fiber micro-bending loss caused by temperature changes, ensuring signal transmission stability.

[0008] Preferably, the tight-closing layer is made of polyurethane. Polyurethane, also known as polyurethane, has urethane groups (-NHCOO-) in its main molecular chain. As a polymer material, it combines the properties of both plastics and rubber. Polyurethane has high flexibility and good wear and oil resistance. Using polyurethane for the tight-closing layer provides good physical protection for the internal sensing fiber core. The stainless steel spiral tube has good compressive and bending resistance, and can withstand significant pressure and tension.

[0009] Preferably, the reinforcement structure includes a reinforcing layer and reinforcing rods. Reinforcing rods are fixedly connected to the inner wall of the reinforcing layer, and the reinforcing rods are connected end-to-end on the inner wall of the reinforcing layer. The reinforcing rods, supported within the reinforcing layer, further enhance the compressive strength of the inner sensing fiber core.

[0010] Preferably, the reinforcing rods are evenly distributed along the tight-pack layer. This enhances the compressive strength of the reinforcing rods while also giving the temperature sensing optical cable a certain degree of flexibility.

[0011] Preferably, the inclination angle of the reinforcing rod is set to 45 degrees, which ensures that the reinforcing rod provides more uniform support to the reinforcing layer.

[0012] Preferably, the reinforcing layer is armored with a stainless steel spiral tube. The stainless steel spiral tube armor is a structure combining a stainless steel spiral tube and a metal armor layer. Using a stainless steel spiral tube armor for the reinforcing layer enhances the inner core of the sensing fiber's resistance to pressure and bending, while maintaining flexibility and optical performance.

[0013] Preferably, the waterproof layer is made of water-resistant grease, which fills the gaps between the reinforcing layer and the tight-fitting layer. Water-resistant grease is a viscous semi-solid material primarily used to prevent moisture or dampness from seeping in through internal gaps. Filling all gaps between the reinforcing layer and the tight-fitting layer, the grease forms a physical barrier to prevent moisture and dampness from invading the optical fiber. This avoids moisture causing the expansion of microcracks on the fiber surface, reducing strength, and triggering hydrogen chemical reactions that lead to hydrogen loss, significantly increasing transmission loss. Simultaneously, the grease contains water-swelling particles that can rapidly expand and block gaps when the sheath is damaged, preventing further water penetration.

[0014] Preferably, the buffer layer is made of thermoplastic polyester elastomer. Thermoplastic polyester elastomer, also known as polyester rubber, is a type of linear block copolymer containing PBT (polybutylene terephthalate) hard polyester segments and aliphatic polyester or polyether soft segments. Thermoplastic polyester elastomers possess excellent resistance to flexural fatigue, excellent impact resistance, and high resilience. Using thermoplastic polyester elastomer in the buffer layer can absorb micro-stress generated by external extrusion and bending, preventing fiber optic breakage or signal distortion. Its high resilience effectively resists construction traction and dynamic deformation.

[0015] Preferably, the outer jacket is made of Kevlar fiber. Kevlar fiber has properties such as heat resistance, flame retardancy, high tensile strength, high strength, and high abrasion resistance. Using Kevlar fiber for the outer jacket provides effective flame retardant and tensile protection for the internal optical fibers. Attached Figure Description

[0016] Figure 1 This is a structural view of the entire front of this utility model;

[0017] Figure 2 This is a diagram showing the overall internal structure of this utility model;

[0018] Figure 3 This is a side view of the internal structure of the present invention.

[0019] The attached diagram lists the components represented by each number as follows:

[0020] 1. Temperature sensing optical cable; 101. Sensing fiber core; 102. Thermistor layer; 103. Tight-packing layer; 104. Reinforcing structure; 1041. Strengthening layer; 1042. Strengthening rod; 105. Waterproof layer; 106. Buffer layer; 107. Outer jacket layer. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0024] In the description of this application, spatial relation terms such as "below," "under," "below," "below," "above," "over," etc., are used herein to describe the relationship between one element or feature shown in the figures and other elements or features. It should be understood that, in addition to the orientation shown in the figures, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figures is flipped, an element or feature described as "below" or "under" or "below" of other elements or features will be oriented "above" other elements or features. Therefore, the exemplary terms "below" and "under" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein are interpreted accordingly.

[0025] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0026] like Figure 1-3As shown, this embodiment provides a distributed optical fiber temperature sensing cable, including a temperature sensing cable 1, and further comprising: a sensing fiber core 101, a thermosensitive layer 102, a tight-packing layer 103, a reinforcement structure 104, a buffer layer 106-1, a buffer layer 106-2, and an outer jacket 107. The thermosensitive layer 102 is fixedly disposed on the outer wall of the sensing fiber core 101, the tight-packing layer 103 is fixedly disposed on the outer wall of the thermosensitive layer 102, the reinforcement structure 104 is disposed on the outer wall of the tight-packing layer 103, a buffer layer 106-1 is disposed on the inner side of the reinforcement structure 104, a buffer layer 106-2 is disposed on the outer layer of the reinforcement structure 104, and an outer jacket 107 is disposed on the outer side of the buffer layer 106-2.

[0027] The thermal layer 102 is made of polyimide coating.

[0028] Polyimide coating is a high-performance coating using polyimide resin as the film-forming material. It possesses excellent heat resistance, electrical insulation, mechanical properties, and chemical stability. Polyimide-coated optical fibers can operate stably for extended periods within a temperature range of -190℃ to 300℃ and can withstand short-term high temperatures up to 400℃. Its coefficient of thermal expansion is well-matched with the cladding of silica optical fibers. The thermistor layer 102, made with a polyimide coating, effectively reduces fiber micro-bending loss caused by temperature changes, ensuring signal transmission stability.

[0029] The tight-fitting layer 103 is made of polyurethane.

[0030] Polyurethane, short for polyurethane, contains urethane groups (-NHCOO-) in its main molecular chain. As a polymer material, it combines the properties of both plastics and rubber. Polyurethane has high flexibility, good wear and oil resistance, and the tight-fitting layer 103 is made of polyurethane, providing good physical protection for the internal sensing fiber core 101. The stainless steel spiral tube has good compressive and bending resistance, and can withstand significant pressure and tension.

[0031] The reinforcing structure 104 includes a reinforcing layer 1041 and a reinforcing rod 1042. The reinforcing rod 1042 is fixedly connected to the inner wall of the reinforcing layer 1041, and the reinforcing rod 1042 is connected end to end on the inner wall of the reinforcing layer 1041.

[0032] The reinforcing rod 1042 is supported within the reinforcing layer 1041, which can further enhance the compressive strength of the inner core 101 of the inner sensing fiber.

[0033] The reinforcing rods 1042 are distributed at equal intervals along the tight-fitting layer 103.

[0034] This enhances the compressive strength of the reinforcing rod 1042 while also giving the temperature sensing optical cable 1 a certain degree of flexibility.

[0035] The inclination angle of the reinforcing rod 1042 is set to 45 degrees.

[0036] This ensures that the reinforcing rod 1042 provides relatively uniform support to the reinforcing layer 1041.

[0037] The reinforcing layer 1041 is armored with a stainless steel spiral tube.

[0038] The stainless steel spiral tube armor is a structure that combines a stainless steel spiral tube with a metal armor layer. The reinforcing layer 1041 is set with stainless steel spiral tube armor to enhance the pressure resistance and bending resistance of the inner sensing fiber core 101, while maintaining flexibility and optical performance.

[0039] The waterproof layer 105 is made of water-resistant grease and fills the gap between the reinforcing layer 1041 and the tight-fitting layer 103.

[0040] Water-blocking grease is a viscous semi-solid material mainly used to prevent moisture or humidity from seeping in through internal gaps. The water-blocking grease fills all gaps between the reinforcing layer 1041 and the tight-closing layer 103, forming a physical barrier to prevent moisture and humidity from invading the optical fiber. This avoids moisture from causing the expansion of microcracks on the surface of the optical fiber, reducing its strength, and triggering hydrogen chemical reactions that lead to hydrogen loss, significantly increasing transmission loss. At the same time, the water-blocking grease contains water-swelling particles that can quickly expand and block gaps when the sheath is damaged, preventing further water penetration.

[0041] The buffer layer 106 is made of thermoplastic polyester elastomer.

[0042] Plastic polyester elastomers, also known as polyester rubber, are linear block copolymers containing PBT (polybutylene terephthalate) hard polyester segments and aliphatic polyester or polyether soft segments. Thermoplastic polyester elastomers possess excellent resistance to flexural fatigue, excellent impact resistance, and high resilience. The buffer layer 106, made of thermoplastic polyester elastomer, can absorb micro-stress generated by external extrusion and bending, preventing fiber optic breakage or signal distortion. Its high resilience effectively resists construction traction and dynamic deformation.

[0043] The outer layer 107 is made of Kevlar fiber.

[0044] Kevlar fiber has properties such as heat resistance, flame retardancy, high tensile strength, high strength, and high abrasion resistance. The outer layer 107 is made of Kevlar fiber, which can provide good flame retardant and tensile protection for the internal optical fibers.

[0045] In practice, polyimide-coated optical fibers can operate stably for a long time in the range of -190℃ to 300℃, and can withstand high temperatures of 400℃ for a short period of time. Its thermal expansion coefficient matches the quartz fiber cladding very well. The thermosensitive layer 102 is made of polyimide coating, which can effectively reduce fiber micro-bending loss caused by temperature changes and ensure signal transmission stability. Polyurethane has high flexibility and good wear and oil resistance. The tight cladding 103 is made of polyurethane, which provides good physical protection for the inner sensing fiber core 101. The stainless steel spiral tube has good compressive and bending resistance and can withstand heavy pressure and tension. The reinforcing layer 1041 is armored with a stainless steel spiral tube to enhance the compressive and bending resistance of the inner sensing fiber core 101, while maintaining flexibility and optical performance. The reinforcing rod 1042 is supported in the reinforcing layer 1041, which can further enhance the compressive resistance of the inner sensing fiber core 101, thereby better enhancing the compressive and bending strength of the temperature sensing optical cable 1 and preventing the inner sensing fiber core 101 from breaking due to excessive bending or external pressure. Water-blocking grease fills all gaps between the reinforcing layer 1041 and the tight-packing layer 103, forming a physical barrier to prevent moisture and humidity from penetrating the optical fiber. This avoids moisture causing micro-cracks to expand on the fiber surface, reducing strength, and triggering hydrogen chemical reactions that lead to hydrogen loss, significantly increasing transmission loss. Simultaneously, the water-blocking grease contains water-swellable particles that rapidly expand and block gaps when the sheath is damaged, preventing further water penetration. Thermoplastic polyester elastomer possesses excellent resistance to bending fatigue, excellent impact resistance, and high resilience. The buffer layer 106, also made of thermoplastic polyester elastomer, absorbs micro-stress generated by external extrusion and bending, preventing fiber breakage or signal distortion. Its high resilience effectively resists construction traction and dynamic deformation. Kevlar fiber exhibits heat resistance, flame retardancy, high tensile strength, high strength, and high abrasion resistance. The outer jacket layer 107, also made of Kevlar fiber, provides effective flame retardant and tensile protection for the internal optical fiber.

[0046] While embodiments or examples of this disclosure have been described with reference to the accompanying drawings, it should be understood that the above embodiments are merely exemplary embodiments or examples, and the scope of this utility model is not limited by these embodiments or examples, but only by the granted claims and their equivalents. Various elements in the embodiments or examples may be omitted or replaced by their equivalents. Furthermore, the steps may be performed in a different order than that described in this disclosure. Further, various elements in the embodiments or examples may be combined in various ways. Importantly, as the technology evolves, many elements described herein can be replaced by equivalents that appear after this disclosure.

Claims

1. A distributed optical fiber temperature sensing cable, comprising a temperature sensing optical cable (1), characterized in that, Also includes: The temperature sensing optical cable (1) is composed of a sensing fiber core (101), a thermal layer (102), a tight-packing layer (103), a reinforcement structure (104), a waterproof layer (105), a buffer layer (106), and an outer jacket layer (107). A thermal layer (102) is fixedly disposed on the outer wall of the sensing fiber core (101). A tight-packing layer (103) is fixedly disposed on the outer wall of the thermal layer (102). A reinforcement structure (104) is disposed on the outer wall of the tight-packing layer (103). A waterproof layer (105) is disposed on the inner side of the reinforcement structure (104). A buffer layer (106) is disposed on the outer layer of the reinforcement structure (104). An outer jacket layer (107) is disposed on the outer side of the buffer layer (106).

2. The distributed optical fiber temperature sensing cable according to claim 1, characterized in that... The thermal layer (102) is made of polyimide coating.

3. The distributed optical fiber temperature sensing cable according to claim 1, characterized in that... The tight-fitting layer (103) is made of polyurethane.

4. The distributed optical fiber temperature sensing cable according to claim 1, characterized in that... The reinforcing structure (104) includes a reinforcing layer (1041) and a reinforcing rod (1042). The reinforcing rod (1042) is fixedly connected to the inner wall of the reinforcing layer (1041), and the reinforcing rod (1042) is connected end to end on the inner wall of the reinforcing layer (1041).

5. The distributed optical fiber temperature sensing cable according to claim 4, characterized in that... The reinforcing rods (1042) are distributed at equal intervals along the tight-fitting layer (103).

6. The distributed optical fiber temperature sensing cable according to claim 4, characterized in that... The inclination angle of the reinforcing rod (1042) is set to 45 degrees.

7. The distributed optical fiber temperature sensing cable according to claim 4, characterized in that... The reinforcing layer (1041) is armored with a stainless steel spiral tube.

8. The distributed optical fiber temperature sensing cable according to claim 1, characterized in that... The waterproof layer (105) is made of water-resistant grease and fills the gap between the reinforcing layer (1041) and the tight-fitting layer (103).

9. The distributed optical fiber temperature sensing cable according to claim 1, characterized in that... The buffer layer (106) is made of thermoplastic polyester elastomer.

10. The distributed optical fiber temperature sensing cable according to claim 1, characterized in that... The outer layer (107) is made of Kevlar fiber.

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