Single-mode strain optical fiber

Abstract

The invention relates to the technical field of optical fibers, in particular to a single-mode strain optical fiber which comprises a flame-retardant sheath, a PE inner sheath, a steel-plastic composite belt, water-blocking yarn, optical fiber bodies, a metal reinforcing piece and fiber paste, a compression-resistant assembly is further arranged in the water-blocking yarn, multiple strands of steel wires are arranged in the compression-resistant assembly, the multiple strands of steel wires are circumferentially and evenly distributed on the outer sides of the multiple strands of optical fiber bodies, and the metal reinforcing piece is arranged on the outer side of the fiber paste. When the single-mode strain optical fiber is subjected to large bending stress, the compression-resistant assembly uniformly disperses the large bending stress or tensile stress through the multiple strands of steel wires, so that irreversible deformation of each protective layer of the single-mode strain optical fiber is avoided when the single-mode strain optical fiber deals with some mine hole environments with large bending stress or tensile stress; therefore, the durability and the service life of the single-mode strain optical fiber are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of optical fibers, in particular to a single-mode strain optical fiber. Background Art

[0002] Single-mode strain fiber is a type of optical fiber specially designed for sensing and measuring physical strain (such as mechanical deformation, vibration, temperature change, etc.); it is based on the principle of single-mode optical fiber, and infers the strain by using the optical properties of optical fiber to monitor the influence of external strain on optical signals; single-mode strain fiber is widely used in scenarios such as structural health monitoring, earthquake monitoring and environmental monitoring, aerospace, machinery and manufacturing industries, smart grids and energy management; for mine environments, single-mode strain fiber is immune to electromagnetic interference (unlike traditional cables that are interfered by electromagnetic waves), can work stably in these harsh environments, and also has low loss characteristics, suitable for data transmission and strain monitoring at greater depths in mines. Single-mode strain fiber can also provide high-precision strain measurement, which plays an important role in warning potential crises in mines (such as landslides, crack expansion, etc.), but when existing single-mode strain fiber is used in mines, it squeezes or pulls the optical cable excessively due to external factors, causing the optical fiber inside the cable to be squeezed, so that the optical fiber is damaged under long-term squeezing.

[0003] In view of the above problems, the prior art has proposed some solutions. For example, Chinese patent application number: CN202321441991.8 discloses a communication optical cable with anti-electromagnetic self-protection function. This solution sets a steel wire sleeve and a rubber tube. When the communication optical cable is used, due to the complexity of the interior of the mine cave, the setting of the steel wire sleeve can increase the compression resistance of the optical cable when the ore falls. The optical fiber inside is wrapped by the rubber tube to achieve a protective effect, and a fiber paste is set inside. The fiber paste allows the optical fiber to be in a free low-stress state in the rubber tube at all times, thereby minimizing The micro-bending loss of the optical fiber and the corrosion of the optical fiber under stress, moisture and humidity are reduced, thereby enhancing the resistance of the entire optical cable. Although the above scheme solves the extrusion stress on the optical cable caused by external factors in the mine, which causes the optical fiber inside the optical cable to be squeezed, so that the optical fiber is damaged under long-term squeezing, when the optical fiber collapses locally in the mine and needs to cope with some large bending or tensile stress, the various protective layers set on the optical cable of the above scheme will undergo irreversible deformation, which will lead to the problem of damage to the single-mode strained optical fiber. At the same time, the damaged optical fiber needs to be replaced as a whole, which will lead to the problem of increased investment cost.

[0004] To this end, a single-mode strained optical fiber is proposed to address the problem that when the single-mode strained optical fiber is subjected to some mine environments with large bending or tensile stress, the protective layers arranged on the optical cable of the above scheme will undergo irreversible deformation, thereby causing damage to the single-mode strained optical fiber. Summary of the invention

[0005] The purpose of the present invention is to provide a single-mode strain optical fiber to solve the problem that when the single-mode strain optical fiber is used in a mine environment with large bending or tensile stress, the protective layers arranged on the optical cable of the above scheme will undergo irreversible deformation, thereby causing damage to the single-mode strain optical fiber.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A single-mode strain optical fiber comprises a flame-retardant sheath, a PE inner sheath, a steel-plastic composite tape, a water-blocking yarn, an optical fiber body, a metal reinforcement and a fiber paste, wherein the PE inner sheath, the steel-plastic composite tape and the water-blocking yarn are sequentially sleeved in the flame-retardant sheath, a plurality of optical fiber bodies are circumferentially uniformly distributed in the water-blocking yarn, the metal reinforcement is arranged between the plurality of optical fiber bodies, the fiber paste is arranged between the water-blocking yarn, the plurality of optical fiber bodies and the metal reinforcement, a pressure-resistant component is further arranged in the water-blocking yarn, a plurality of steel wires are arranged in the pressure-resistant component, and the plurality of steel wires are circumferentially uniformly distributed outside the plurality of optical fiber bodies, when the single-mode strain optical fiber is subjected to large bending stress, the pressure-resistant component evenly disperses the large bending stress or tensile stress subjected to the pressure through the plurality of steel wires, thereby avoiding the problem that when the single-mode strain optical fiber is subjected to some mine cave environments with large bending or tensile stress, each protective layer of the single-mode strain optical fiber is irreversibly deformed, thereby causing damage to the single-mode strain optical fiber, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0008] Preferably, the pressure-resistant component includes a pressure-resistant sleeve, a pressure-applying sleeve and a support block, the pressure-resistant sleeve is sleeved on a metal reinforcement, a plurality of pressure-applying sleeves are respectively sleeved on a plurality of steel wires, a plurality of support blocks are respectively installed between the pressure-resistant sleeve and a plurality of pressure-applying sleeves, a plurality of support blocks cooperate with the pressure-resistant sleeve and a plurality of pressure-applying sleeves to form an I-shape, support surfaces are provided on both sides of the I-shape, a plurality of support surfaces are arc-shaped, and a plurality of support surfaces are respectively coaxial with a plurality of optical fiber bodies, the large bending stress or tensile stress to which the plurality of steel wires are subjected is uniformly dispersed through the pressure-resistant sleeve, the pressure-applying sleeve and the support block, thereby avoiding the problem that when the single-mode strain optical fiber copes with some mine environments with large bending or tensile stress, the protective layers of the single-mode strain optical fiber are irreversibly deformed, thereby causing damage to the single-mode strain optical fiber, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0009] Preferably, the water-blocking yarn is also circumferentially evenly distributed with a plurality of anti-compression plates, and the plurality of anti-compression plates are all arched, and a pressure-resistant surface is provided on the side close to the water-blocking yarn, and a plurality of pressure-dividing surfaces are provided on both side edges of the plurality of anti-compression plates, and the plurality of pressure-dividing surfaces are in contact with the outer ring of the pressure-resistant sleeve, and a buffer groove is provided between the plurality of anti-compression plates, so as to avoid the problem that when the single-mode strain optical fiber copes with some mine environments with large bending or tensile stress, excessive stress directly contacts the optical fiber body, thereby causing damage to the single-mode strain optical fiber, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0010] Preferably, an installation cavity is provided between the plurality of anti-compression sheets and the pressure-resistant sleeves, and the plurality of optical fiber bodies are respectively installed in the plurality of installation cavities, and the plurality of optical fiber bodies are separated from the inner walls of the plurality of installation cavities by fiber paste, and the side of the plurality of fiber pastes close to the anti-compression sheets is set as the pressure-resistant area, and the side of the plurality of fiber pastes close to the pressure-resistant sleeves and the supporting surface is set as the supporting area. This avoids the problem of excessive stress directly contacting the optical fiber body when the single-mode strain optical fiber copes with some mine environments with large bending or tensile stress, thereby causing damage to the single-mode strain optical fiber, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0011] Preferably, a buffer sleeve is provided between the water-blocking yarn and the multiple compression-resistant sheets, and the multiple buffer sheets are evenly distributed on the inner circumference of the buffer sleeve, and the outer ends of the multiple buffer sheets are connected to the buffer sleeve, and the multiple buffer sheets are respectively embedded in multiple buffer grooves, thereby avoiding the problem of excessive stress directly contacting the optical fiber body when the single-mode strain optical fiber copes with some mine environments with large bending or tensile stress, thereby causing damage to the single-mode strain optical fiber, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0012] Preferably, buffer surfaces are provided on both side edges of the multiple buffer sheets, and the multiple buffer surfaces are serrated. Serrated pressure grooves are provided on both side walls of the multiple buffer grooves, and the multiple buffer surfaces are respectively embedded in the multiple pressure grooves, thereby avoiding the problem of excessive stress directly contacting the optical fiber body when the single-mode strain optical fiber copes with some mine environments with large bending or tensile stress, thereby causing damage to the single-mode strain optical fiber, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0013] Preferably, a plurality of compensation rings are provided between the steel wire and the pressure sleeve, and the plurality of compensation rings are evenly distributed on the outer surface of the steel wire along the axis of the steel wire, and the inner and outer rings of the plurality of compensation rings are respectively connected to the steel wire and the inner ring of the pressure sleeve, and the compensation rings are made of rubber material, and a compensation cavity is provided between the plurality of compensation rings, thereby avoiding the problem that when the single-mode strain optical fiber copes with some mine environments with large bending or tensile stress, multiple strands of steel wire slide in the pressure sleeve, thereby causing the steel wire's ability to cope with bending stress to decrease, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0014] Preferably, the compression sleeve, pressure sleeve, support block and compression sheet are all made of at least one material including high-strength polytetrafluoroethylene, polyester or nylon, thereby avoiding the problem of excessive stress directly contacting the optical fiber body when the single-mode strain optical fiber is dealing with some mine environments with large bending or tensile stress, thereby causing damage to the single-mode strain optical fiber, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention further provides a pressure-resistant component in the water-blocking yarn, wherein a plurality of steel wires are provided in the pressure-resistant component, and the plurality of steel wires are evenly distributed on the outside of the plurality of optical fiber bodies. When the single-mode strain optical fiber is subjected to large bending stress, the pressure-resistant component evenly disperses the large bending stress or tensile stress through the plurality of steel wires, thereby avoiding the problem that when the single-mode strain optical fiber is subjected to some mine environments with large bending or tensile stress, the protective layers of the single-mode strain optical fiber are irreversibly deformed, thereby causing damage to the single-mode strain optical fiber, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0017] 2. The present invention has a plurality of anti-compression sheets evenly distributed circumferentially inside the water-blocking yarn, and the plurality of anti-compression sheets are all arched, and a pressure-resistant surface is provided on one side of the plurality of anti-compression sheets close to the water-blocking yarn, and a plurality of pressure-dividing surfaces are provided on both sides of the plurality of anti-compression sheets, and the plurality of pressure-dividing surfaces are in contact with the outer ring of the pressure-resistant sleeve, and a buffer groove is provided between the plurality of anti-compression sheets. This avoids the problem that when the single-mode strain optical fiber is in a mine environment with large bending or tensile stress, excessive stress directly contacts the optical fiber body, thereby causing damage to the single-mode strain optical fiber, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0018] 3. The present invention provides a buffer sleeve between the water-blocking yarn and a plurality of compression-resistant sheets, wherein a plurality of buffer sheets are evenly distributed on the inner circumference of the buffer sleeve, and the outer ends of the plurality of buffer sheets are connected to the buffer sleeve, and the plurality of buffer sheets are respectively embedded in a plurality of buffer grooves. This avoids the problem that when the single-mode strain optical fiber is subjected to some mine environments with large bending or tensile stress, excessive stress directly contacts the optical fiber body, thereby causing damage to the single-mode strain optical fiber, thereby ensuring the durability and service life of the single-mode strain optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the single-mode strain optical fiber of the present invention;

[0020] Figure 2 is a cross-sectional view of a single-mode strained optical fiber of the present invention;

[0021] Figure 3 It is a local force analysis diagram when the compression-resistant sheet in the single-mode strain optical fiber of the present invention is subjected to local collapse;

[0022] Figure 4 This is a force analysis diagram of the compression-resistant sheet and the buffer sheet in the single-mode strain optical fiber of the present invention;

[0023] Figure 5 It is a force analysis diagram of the compression-resistant sheet, the compression-resistant sleeve and the support block in the single-mode strain optical fiber of the present invention;

[0024] Figure 6 It is a schematic structural diagram of the pressure sleeve, compensation ring and steel wire in the single-mode strain optical fiber of the present invention.

[0025] In the figure: 1. flame retardant sheath; 2. PE inner sheath; 3. steel-plastic composite tape; 4. water-blocking yarn; 5. optical fiber body; 6. metal reinforcement; 7. fiber paste; 801. steel wire; 802. pressure-resistant sleeve; 803. pressure-applying sleeve; 804. support block; 805. support surface; 806. pressure-resistant sheet; 807. pressure-resistant surface; 808. pressure-dividing surface; 809. buffer groove; 901. installation cavity; 902. pressure-resistant area; 903. support area; 904. buffer sleeve; 905. buffer sheet; 906. buffer surface; 907. pressure groove; 908. compensation ring; 909. compensation cavity. DETAILED DESCRIPTION

[0026] See also Figures 1 to 6 The present invention provides a single-mode strain optical fiber, and the technical solution is as follows:

[0027] A single-mode strain optical fiber comprises a flame-retardant sheath 1, a PE inner sheath 2, a steel-plastic composite tape 3, a water-blocking yarn 4, an optical fiber body 5, a metal reinforcement 6 and a fiber paste 7. The PE inner sheath 2, the steel-plastic composite tape 3 and the water-blocking yarn 4 are sequentially sleeved in the flame-retardant sheath 1. The multi-strand optical fiber body 5 is evenly distributed in the water-blocking yarn 4. The metal reinforcement 6 is arranged between the multi-strand optical fiber body 5. The fiber paste 7 is arranged between the water-blocking yarn 4, the multi-strand optical fiber body 5 and the metal reinforcement 6. A pressure-resistant component is also arranged in the water-blocking yarn 4. The pressure-resistant component is provided with a multi-strand steel wire 801. The multi-strand steel wire 801 is evenly distributed on the outside of the multi-strand optical fiber body 5. When the single-mode strain optical fiber is used in a mine cave environment, the flame-retardant sheath 1 can block the mine cave. The burning flame during the explosion of internal combustible gas, the PE inner sheath 2 can ensure the service life of the single-mode strain fiber through its own wear-resistant characteristics, the water-blocking yarn 4 can block the intrusion of moisture in the mine, and when the single-mode strain fiber is affected by local collapse in the mine, the stress point on the single-mode strain fiber is set to F, and the compression component disperses the F stress evenly through multiple strands of steel wire 801, and decomposes the remaining F stress through the fiber paste 7, avoiding the problem of irreversible deformation of the protective layers of the single-mode strain fiber when the single-mode strain fiber copes with some mine environments with large bending or tensile stress, thereby causing damage to the single-mode strain fiber, thereby ensuring the durability and service life of the single-mode strain fiber.

[0028] The pressure-resistant assembly includes a pressure-resistant sleeve 802, a pressure sleeve 803 and a support block 804. The pressure-resistant sleeve 802 is sleeved on the metal reinforcement 6. The multiple pressure sleeves 803 are sleeved on the multiple strands of steel wire 801 respectively. The multiple support blocks 804 are respectively installed between the pressure-resistant sleeve 802 and the multiple pressure sleeves 803. The multiple support blocks 804 cooperate with the pressure-resistant sleeve 802 and the multiple pressure sleeves 803 to form an I-shape. Support surfaces 805 are provided on both sides of the I-shape. The multiple support surfaces 805 are all arc-shaped, and the multiple support surfaces 805 are coaxial with the multiple strands of optical fiber body 5 respectively. In the single-mode application When the strain optical fiber is affected by local collapse in the mine, F stress is applied to the flame retardant sheath 1, and the single-mode strain optical fiber will bend. At this time, the compression sleeve 802, the pressure sleeve 803 and the support block 804 will transfer the bending stress to the multiple steel wires 801, and the bending stress will be decomposed by the multiple steel wires 801, thereby avoiding the problem that the protective layers of the single-mode strain optical fiber are irreversibly deformed when the single-mode strain optical fiber copes with some mine environments with large bending or tensile stress, thereby causing damage to the single-mode strain optical fiber, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0029] It is worth noting that there are multiple anti-compression plates 806 evenly distributed on the circumference of the water-blocking yarn 4, and the multiple anti-compression plates 806 are all arched. The multiple anti-compression plates 806 are provided with anti-compression surfaces 807 on the side close to the water-blocking yarn 4, and the multiple anti-compression plates 806 are provided with pressure dividing surfaces 808 on both sides. The multiple pressure dividing surfaces 808 are in contact with the outer circle of the pressure-resistant sleeve 802, and buffer grooves 809 are provided between the multiple anti-compression plates 806. When F stress is applied to the anti-compression plate 806, the anti-compression plate 806 disperses the F stress to the multiple pressure sleeves 803 through the arched structure. The pressure sleeve 803 decomposes the F stress through the steel wire 801, thereby avoiding the problem that the single-mode strain optical fiber is damaged due to excessive stress directly contacting the optical fiber body 5 when dealing with some mine environments with large bending or tensile stress, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0030] It is also worth noting that a mounting cavity 901 is provided between the plurality of anti-compression sheets 806 and the anti-compression sleeve 802, and the plurality of optical fiber bodies 5 are respectively installed in the plurality of mounting cavities 901, and the plurality of optical fiber bodies 5 are separated from the inner walls of the plurality of mounting cavities 901 by the fiber paste 7, and the side of the plurality of fiber pastes 7 close to the anti-compression sheet 806 is set as the anti-compression area 902, and the side of the plurality of fiber pastes 7 close to the anti-compression sleeve 802 and the support surface 805 is set as the support area 903, when the F stress is applied to the anti-compression sheet 806, the anti-compression sheet 806 is provided with an arch structure. The F stress is dispersed to multiple pressure sleeves 803, and the anti-compression sheet 806 will bend at this time. In order to prevent the bent anti-compression sheet 806 from affecting the optical fiber body 5, the optical fiber body 5 will disperse the stress through the anti-compression area 902 and the support area 903 in the installation cavity 901, thereby avoiding the problem that excessive stress directly contacts the optical fiber body 5 when the single-mode strain optical fiber is in a mine environment with large bending or tensile stress, thereby causing damage to the single-mode strain optical fiber, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0031] A buffer sleeve 904 is provided between the water-blocking yarn 4 and the plurality of anti-compression sheets 806, and a plurality of buffer sheets 905 are evenly distributed on the inner circumference of the buffer sleeve 904, and the outer ends of the plurality of buffer sheets 905 are connected to the buffer sleeve 904, and the plurality of buffer sheets 905 are respectively embedded in the plurality of buffer grooves 809. When the anti-compression sheet 806 is compressed and bent, the side of the anti-compression sheet 806 close to the buffer sheet 905 decomposes the F stress and applies it to the buffer sheet 905. At this time, the buffer sheet 905 will buffer the anti-compression sheet 806, thereby avoiding the problem that when the single-mode strain optical fiber copes with some mine environments with large bending or tensile stress, excessive stress directly contacts the optical fiber body 5, thereby causing damage to the single-mode strain optical fiber, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0032] Buffer surfaces 906 are also provided on both side edges of the plurality of buffer sheets 905, and the plurality of buffer surfaces 906 are serrated. Serrated pressure grooves 907 are provided on both side walls of the plurality of buffer grooves 809, and the plurality of buffer surfaces 906 are respectively embedded in the plurality of pressure grooves 907. By arranging the serrated buffer surfaces 906 and the buffer grooves 809 in the buffer grooves 809, when the buffer sheet 905 buffers the F on the anti-compression sheet 806, the buffer surfaces 906 and the pressure grooves 907 that cooperate with each other increase the pressure area of ​​the components of force on both sides when the anti-compression sheet 806 is under pressure through the serrated connection, thereby reducing stress concentration, avoiding the problem that when the single-mode strain optical fiber is in response to some mine environments with large bending or tensile stress, excessive stress directly contacts the optical fiber body 5, thereby causing damage to the single-mode strain optical fiber, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0033] A plurality of compensation rings 908 are arranged between the steel wire 801 and the pressure sleeve 803. The plurality of compensation rings 908 are evenly distributed on the outer surface of the steel wire 801 along the axis of the steel wire 801, and the inner and outer rings of the plurality of compensation rings 908 are respectively connected to the steel wire 801 and the inner ring of the pressure sleeve 803. The compensation rings 908 are made of rubber material, and a compensation cavity 909 is arranged between the plurality of compensation rings 908. The large bending stress on the single-mode strain optical fiber can be transferred to the steel wire 801 through the compensation rings 908. When the single-mode strain optical fiber is subjected to large bending stress, the stress applied to the pressure sleeve 803 will be applied to the steel wire 801 through the compensation rings 908. When multiple steel wires 801 are compressed and bent at the same time, in order to prevent the single-mode strain optical fiber from being directly restricted in bending angle by the steel wires 801, thereby affecting the detection accuracy of the single-mode strain optical fiber, multiple steel wires 801 will be connected through a compensation ring 908 and slide in the pressure sleeve 803. The compensation ring 908 provides additional support for the steel wires 801 here, thereby preventing the single-mode strain optical fiber from sliding in the pressure sleeve 803 when dealing with some mine environments with large bending or tensile stress, thereby reducing the ability of the steel wires 801 to cope with bending stress, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0034] The compression sleeve 802, the pressure sleeve 803, the support block 804 and the compression sheet 806 are all made of high-strength polytetrafluoroethylene. When dealing with large stress, the high-strength polytetrafluoroethylene can help the optical fiber body 5 to better withstand the stress, thereby improving its durability and stability. This avoids the problem that when the single-mode strain optical fiber is dealing with some mine environments with large bending or tensile stress, excessive stress directly contacts the optical fiber body 5, thereby causing damage to the single-mode strain optical fiber, thereby ensuring the durability and service life of the single-mode strain optical fiber.

[0035] While working, see Figures 1 to 6When the single-mode strain optical fiber is used in a mine environment, the flame-retardant sheath 1 can block the burning flame when the combustible gas explodes in the mine. The PE inner sheath 2 can ensure the service life of the single-mode strain optical fiber through its own wear-resistant characteristics. The water-blocking yarn 4 can block the intrusion of moisture in the mine. When the single-mode strain optical fiber is subjected to tensile stress, the steel wire 801 resists the tensile stress. When the single-mode strain optical fiber is subjected to large bending stress or lateral pressure, the PE inner sheath 2 can reduce a part of the F stress. The F stress is applied to the buffer sleeve 904 after passing through the PE inner sheath 2, and is applied to the compression surface 807 of the compression sheet 806 after being buffered by the buffer sleeve 904. After the compression surface 807 is compressed, the F stress is transmitted through the arch. The pressure is transferred to the pressure-dividing surface 808. At the same time, when the anti-pressure sheet 806 is deformed under pressure, the buffer groove 809 will also shrink. At this time, the buffer sheet 905 will buffer the pressure of the anti-pressure sheet 806. The stress on the pressure-dividing surface 808 is applied to the pressure sleeve 803 and transmitted to the support block 804 through the pressure sleeve 803. The support block 804 applies the stress to the pressure-resistant sleeve 802. In this process, multiple support blocks 804 cooperate with the pressure-resistant sleeve 802 and multiple pressure sleeves 803 to form an I-shaped structure to decompose the stress. At this time, the optical fiber body 5 in the installation cavity 901 is subjected to only sensible stress due to the existence of the anti-pressure area 902 and the support area 903 of the fiber paste 7.

[0036] It is worth noting that when the single-mode strain optical fiber is subjected to large bending stress, the stress applied to the pressure sleeve 803 will be applied to the steel wire 801 through the compensation ring 908. At this time, multiple steel wires 801 are compressed and bent at the same time. In order to avoid the single-mode strain optical fiber being directly restricted in bending angle by the steel wire 801, thereby affecting the detection accuracy of the single-mode strain optical fiber, multiple steel wires 801 will be connected by the compensation ring 908 and slide in the pressure sleeve 803. The compensation ring 908 provides additional support for the steel wire 801 here.

[0037] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A single-mode strain optical fiber, characterized in that: The invention comprises a flame retardant sheath (1), a PE inner sheath (2), a steel-plastic composite tape (3), a water-blocking yarn (4), an optical fiber body (5), a metal reinforcement member (6) and a fiber paste (7). The PE inner sheath (2), the steel-plastic composite tape (3) and the water-blocking yarn (4) are sequentially sleeved in the flame retardant sheath (1). A plurality of optical fiber bodies (5) are circumferentially evenly distributed in the water-blocking yarn (4). The metal reinforcement member (6) is arranged between the plurality of optical fiber bodies (5). The fiber paste (7) is arranged between the water-blocking yarn (4), the plurality of optical fiber bodies (5) and the metal reinforcement member (6). A pressure-resistant component is also arranged in the water-blocking yarn (4). A plurality of steel wires (801) are arranged in the pressure-resistant component. The plurality of steel wires (801) are circumferentially evenly distributed outside the plurality of optical fiber bodies (5). When the single-mode strain optical fiber is subjected to large bending stress, the pressure-resistant component evenly disperses the large bending stress or tensile stress through the plurality of steel wires (801).

2. A single-mode strain optical fiber according to claim 1, characterized in that: The pressure-resistant assembly comprises a pressure-resistant sleeve (802), a pressure-applying sleeve (803) and a support block (804); the pressure-resistant sleeve (802) is sleeved on the metal reinforcement (6); a plurality of pressure-applying sleeves (803) are sleeved on the multiple strands of steel wire (801) respectively; a plurality of support blocks (804) are respectively installed between the pressure-resistant sleeve (802) and the multiple pressure-applying sleeves (803); the multiple support blocks (804) cooperate with the pressure-resistant sleeve (802) and the multiple pressure-applying sleeves (803) to form an I-shape; both sides of the I-shape are provided with support surfaces (805); the multiple support surfaces (805) are all arc-shaped, and the multiple support surfaces (805) are respectively coaxial with the multiple strands of optical fiber body (5).

3. A single-mode strain optical fiber according to claim 2, characterized in that: The water-blocking yarn (4) is also circumferentially evenly distributed with a plurality of anti-compression sheets (806); the plurality of anti-compression sheets (806) are all arched; a plurality of anti-compression sheets (806) are each provided with an anti-compression surface (807) on one side close to the water-blocking yarn (4); a plurality of anti-compression sheets (806) are each provided with a pressure dividing surface (808) on both side edges; the plurality of pressure dividing surfaces (808) are each in contact with the outer ring of the anti-compression sleeve (802); and a buffer groove (809) is provided between the plurality of anti-compression sheets (806).

4. A single-mode strain optical fiber according to claim 3, characterized in that: An installation cavity (901) is provided between the plurality of anti-compression sheets (806) and the anti-compression sleeve (802), and the plurality of optical fiber bodies (5) are respectively installed in the plurality of installation cavities (901), and the plurality of optical fiber bodies (5) are separated from the inner walls of the plurality of installation cavities (901) by fiber paste (7), and the side of the plurality of fiber pastes (7) close to the anti-compression sheets (806) is set as an anti-compression area (902), and the side of the plurality of fiber pastes (7) close to the anti-compression sleeve (802) and the support surface (805) is set as a support area (903).

5. A single-mode strain optical fiber according to claim 4, characterized in that: A buffer sleeve (904) is provided between the water-blocking yarn (4) and the plurality of compression-resistant sheets (806); a plurality of buffer sheets (905) are evenly distributed on the inner circumference of the buffer sleeve (904); and the outer ends of the plurality of buffer sheets (905) are connected to the buffer sleeve (904); and the plurality of buffer sheets (905) are respectively embedded in a plurality of buffer grooves (809).

6. A single-mode strain optical fiber according to claim 5, characterized in that: Buffer surfaces (906) are also provided on both side edges of the plurality of buffer sheets (905), and the plurality of buffer surfaces (906) are serrated. Sawtooth-shaped pressure-bearing grooves (907) are provided on both side walls of the plurality of buffer grooves (809), and the plurality of buffer surfaces (906) are respectively embedded in the plurality of pressure-bearing grooves (907).

7. A single-mode strain optical fiber according to claim 2, characterized in that: A plurality of compensation rings (908) are arranged between the steel wire (801) and the pressure sleeve (803); the plurality of compensation rings (908) are evenly distributed on the outer surface of the steel wire (801) along the axis of the steel wire (801); and the inner and outer rings of the plurality of compensation rings (908) are respectively connected to the steel wire (801) and the inner ring of the pressure sleeve (803); the compensation rings (908) are made of rubber material; and compensation cavities (909) are arranged between the plurality of compensation rings (908).

8. A single-mode strain optical fiber according to claim 3, characterized in that: The anti-compression sleeve (802), the pressure sleeve (803), the support block (804) and the anti-compression sheet (806) are all made of at least any one of high-strength polytetrafluoroethylene, polyester or nylon.

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