Optical cable capable of being remotely inspected and detection method thereof

Abstract

The invention discloses an optical cable capable of being remotely inspected and a detection method thereof, and belongs to the technical field of optical cable preparation, the optical cable comprises an optical unit and an outer sheath arranged on the periphery of the optical unit, and an induction electric unit is further arranged between the optical unit and the outer sheath and can make contact with the external environment when the outer sheath is damaged. According to the optical cable capable of being remotely inspected, the induction electric unit is arranged in the outer sheath of the optical cable, when the outer sheath of the wire of the induction electric unit is damaged and exposed to the outside, a pulse signal is input into the wire through a TDR instrument, and other undamaged parts form an insulating section under the protection of the outer sheath, so that the wire is not damaged; the damaged part of the wire is in direct contact with air to form a conducting state, so that the property change of an insulating medium of the induction electric unit is caused, the propagation speed and the reflection waveform of a pulse signal at the damaged part are further influenced, and a worker can quickly obtain the damaged part of the optical cable through the change position of the reflection waveform; and the inspection time of the damaged part of the optical cable is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of optical cable preparation, and in particular relates to an optical cable capable of remote inspection and a detection method thereof. Background Art

[0002] With the continuous development of fiber-optic communication technology, people have put forward higher and higher requirements for the transmission efficiency and stability of information. With the gradual strengthening of environmental protection awareness, the domestic ecological environment has also been greatly improved. In outdoor environments, more and more rats and birds are biting cables, which can easily cause communication interruptions.

[0003] In the manufacturing and design of existing optical cables, the sheath of the optical cable is usually designed with armor to prevent the optical cable from being bitten. When the sheath of the optical cable is bitten, it is usually not discovered in time, and it can only be discovered after the optical fiber is bitten off and the signal is interrupted. The interruption of communication caused by the fiber biting off will cause great losses, and a lot of manpower and material resources will be spent in the inspection of tens of kilometers to determine the damaged part of the optical cable, and then repair and remedy it, which greatly prolongs the recovery time and recovery cost of communication. Summary of the invention

[0004] In view of one or more of the above defects or improvement needs in the prior art, the present invention provides a remotely inspectable optical cable to solve the problem that the damaged part of the existing optical cable cannot be discovered in time after the sheath is bitten through.

[0005] To achieve the above object, the present invention provides a remotely inspectable optical cable, comprising:

[0006] An optical unit, an inductive electric unit and an outer sheath, wherein the optical unit and the inductive electric unit are both arranged in the outer sheath, and the inductive electric unit contacts with the external environment when the outer sheath is damaged.

[0007] As a further improvement of the present invention, the induction electrical unit includes a bare wire, the outer periphery of the bare wire is coated with an insulating layer, and the insulating layer can be dissolved in an alkaline solution after being exposed to light for a set time.

[0008] As a further improvement of the present invention, the insulating layer is filled with 2,1,5-sulfonyl chloride and sodium hydroxide powder.

[0009] As a further improvement of the present invention, the insulating layer is filled with 2,1,5-sulfonyl chloride, and the space between the outer sheath and the induction unit is filled with sodium hydroxide powder.

[0010] As a further improvement of the present invention, it also includes:

[0011] Strengthen the core;

[0012] There are multiple optical units, and the multiple optical units are twisted and wound around the outer periphery of the reinforcing core;

[0013] The inductive electric unit is twisted and wound around the outer circumferences of the plurality of optical units.

[0014] As a further improvement of the present invention, the conductive wires of the induction electric unit do not contact each other along the axis of the reinforcing core.

[0015] As a further improvement of the present invention, it also includes:

[0016] Strengthen the core;

[0017] There are a plurality of optical units, and the inductive electrical unit is twisted together with the plurality of optical units and arranged on the outer periphery of the reinforcing core.

[0018] As a further improvement of the present invention, the optical unit includes at least one optical fiber, the outer periphery of the optical fiber is covered with a sleeve, and the DuPont hardness value of the sleeve is 30-85.

[0019] As a further improvement of the present invention, the wire is made of one of gold, silver, copper or aluminum.

[0020] The present application also includes a detection method for a remotely inspectable optical cable, which is used to detect damage to the remotely inspectable optical cable, and comprises:

[0021] A TDR instrument is used to input a pulse signal to the induction electrical unit;

[0022] Obtain the propagation time and reflection waveform of the pulse signal in the cable;

[0023] Whether the optical cable can be remotely inspected is determined based on the reflected waveform, and the damaged position of the optical cable can be remotely inspected is determined based on the propagation time.

[0024] The present application also includes a method for preparing an optical cable capable of remote inspection, which comprises the following steps:

[0025] S1, obtaining light units and induction electrical units;

[0026] S2, pulling the reinforcing core, twisting a plurality of optical units and arranging them on the periphery of the reinforcing core, and twisting the induction electric units and arranging them on the periphery of a plurality of reinforcing cores;

[0027] S3. Extrude an outer sheath around the reinforcing core.

[0028] As a further improvement of the present invention, the induction electric unit preparation process is as follows:

[0029] Dissolving 2,1,5-sulfonyl chloride and phenolic resin in anhydrous ethanol to form a coating solution;

[0030] Selecting a conductor and dipping the conductor into a coating solution;

[0031] The wire is dried by a hot air device to obtain an induction electric unit with an insulating layer.

[0032] As a further improvement of the present invention, the step S2 further includes: spraying sodium hydroxide powder on the periphery of the twisted induction electric unit.

[0033] As a further improvement of the present invention, the mass ratio of the 2,1,5-sulfonyl chloride to the phenolic resin is 1:2-5; and the sodium hydroxide powder accounts for 3%-10% of the total mass ratio of the insulating layer.

[0034] As a further improvement of the present invention, the induction electric unit preparation process is as follows:

[0035] Traction wire;

[0036] High-density polyethylene is used as a base material, and 2,1,5-sulfonyl chloride and sodium hydroxide powder are added to the base material to form a casing material;

[0037] Extruding a sleeve around the outer periphery of the conductor;

[0038] The sleeve is cooled and shaped by air cooling.

[0039] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0040] In general, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

[0041] (1) The remotely inspectable optical cable of the present invention is provided with an induction unit in the outer sheath of the optical cable. When the conductor of the induction unit is damaged and in contact with the outside, a pulse signal is input into the conductor through a TDR instrument. Since the other undamaged parts form an insulation section under the protection of the outer sheath, and the damaged part of the conductor is in direct contact with the air to form a conductive state, it will cause the insulating medium properties at the damaged part to change, that is, the relative dielectric constant changes, which in turn affects the propagation speed and reflection waveform of the pulse signal at the damaged position. The staff can quickly obtain the damaged part of the optical cable through the change position of the reflection waveform, which greatly reduces the inspection time of the damaged part of the optical cable and improves the recovery efficiency of communication. At the same time, when the communication is not interrupted, the exposed wire can also detect the damaged part of the optical cable, so that the damaged part of the optical cable can be repaired in advance, avoiding the situation that the damaged position of the traditional optical cable can only be known when the communication is interrupted.

[0042] (2) The remotely inspectable optical cable of the present invention twists the inductive electric unit with the optical unit, or twists the inductive electric unit and arranges it on the periphery of the optical unit, so that no matter where the optical cable is damaged, the inductive electric unit will be exposed to the outside corresponding to the damage, causing the properties of the insulating medium at the damaged part to change, ensuring that when the optical cable is damaged, the damaged part can be detected accordingly, thereby achieving efficient and accurate detection of the damaged part of the optical cable.

[0043] (3) The remotely inspectable optical cable of the present invention controls the twisting pitch of the inductive electrical unit so that the conductors of the inductive electrical unit do not contact each other along the axial direction of the reinforcing core, thereby avoiding contact between the outer circumferences of the conductors and affecting the reflected waveform, thereby ensuring the accuracy of detecting damaged parts of the optical cable.

[0044] (4) The remote inspection optical cable of the present invention is made by filling 2,1,5-sulfonyl chloride and sodium hydroxide powder in the insulating layer of the inductive electrical unit, or filling 2,1,5-sulfonyl chloride in the insulating layer and filling sodium hydroxide powder in the space between the outer sheath and the inductive electrical unit. When the outer sheath of the optical cable is damaged, the 2,1,5-sulfonyl chloride in the insulating layer reacts to form eneketone under light, and the sodium hydroxide powder absorbs moisture in the air to form weak alkaline water. The eneketone and water form indene carboxylic acid and dissolve in the weak alkaline water, causing the insulation layer of the wire at the corresponding part to disappear, thereby causing the property of the insulating medium at the part to change, so that it can be sensed by the TDR instrument, and then the damaged part of the optical cable is obtained. At the same time, the insulating layer on the periphery of the inductive electrical unit can completely prevent the inductive electrical unit from contacting along the reinforcing core axis, and prevent the inductive electrical unit surrounding the periphery of the optical unit from contacting during the contraction of the optical cable, thereby ensuring the accuracy of the TDR instrument detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a schematic diagram of the structure of an optical cable capable of remote inspection in an embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of the structure of an optical cable capable of remote inspection in an embodiment of the present invention;

[0047] Figure 3 It is a schematic diagram of the structure of an optical cable capable of remote inspection according to an embodiment of the present invention.

[0048] In all the drawings, the same reference numerals represent the same technical features, specifically: 1. optical fiber; 2. casing; 3. reinforcing core; 4. induction electric unit; 5. outer sheath. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a 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, a first feature being "above", "above" or "above" a 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. A first feature being "below", "below" or "below" a 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.

[0054] Example:

[0055] See also Figures 1 to 3 The remotely inspectable optical cable in the preferred embodiment of the present invention includes an optical unit and an outer sheath 5 arranged on the outer periphery of the optical unit. An inductive electric unit 4 is also arranged between the optical unit and the outer sheath 5. The wire of the inductive electric unit 4 will directly contact the external environment when the outer sheath 5 is damaged.

[0056] The remotely inspectable optical cable of the present invention arranges an induction unit 4 in the outer sheath 5 of the optical cable. When the wire of the induction unit 4 is damaged and exposed to the outside, a pulse signal is input into the wire through a TDR instrument. Since other undamaged parts form an insulating section under the protection of the outer sheath 5, and the damaged part of the wire is in direct contact with the air to form a conductive state, it will cause the properties of the insulating medium at the damaged part to change, thereby affecting the propagation speed and reflection waveform of the pulse signal at the damaged position. The staff can quickly obtain the damaged part of the optical cable through the changed position of the reflection waveform, which greatly reduces the inspection time of the damaged part of the optical cable and improves the recovery efficiency of communication.

[0057] Preferably, the inductive electrical unit 4 in the present application can be a bare wire, which can be buried in the outer sheath 5, or placed in the outer sheath 5 together with the optical unit; optionally, the outer periphery of the wire can also be coated with a protective layer, which needs to be quickly removed when the optical cable is damaged to ensure that the wire is in contact with the outside air, resulting in changes in the properties of the insulating medium.

[0058] Furthermore, the inductive electric unit 4 in the present application contacts the external environment when the outer sheath 5 is damaged, which means that after the outer sheath 5 is damaged, the inductive electric unit 4 is exposed to the external environment, such as contact with the external air, moisture in the external air, external rainwater, etc.

[0059] Specifically, as an optional embodiment of the present invention, the remotely inspectable optical cable in the present application also includes a reinforcing core 3, the above-mentioned optical units are multiple, and the multiple optical units are twisted and arranged on the periphery of the reinforcing core 3, and the inductive electric unit 4 is also twisted and arranged on the periphery of the optical unit. The reinforcing core 3 is used to strengthen the tensile strength of the optical cable, reduce the axial contraction excess length of the optical cable, and avoid the inductive electric unit 4 from axially telescoping contact, which causes the TDR instrument to be unable to accurately sense the change of the reflected waveform. At the same time, the inductive electric unit 4 twisted and arranged on the periphery of the optical unit serves as the outer layer structure of the optical unit. When the optical unit is damaged, the inductive electric unit 4 is also inevitably damaged, and the TDR instrument can quickly detect the damaged part.

[0060] Furthermore, the present application controls the twisting pitch of the induction electric unit 4 so that the wires of the induction electric unit 4 do not contact each other along the axial direction of the reinforcing core 3. When the induction electric unit 4 is a bare wire, once the outer sheath 5 is damaged, the wire can directly contact the outside air, resulting in a change in the properties of the insulating medium, thereby ensuring that the TDR instrument accurately perceives the damaged part. However, correspondingly, when the wire is completely exposed, due to the change in the axial expansion and contraction excess length of the optical cable, the wires may contact each other in the axial direction of the reinforcing core 3, resulting in inaccurate reflection waveforms detected by the TDR instrument, affecting the detection of damaged parts of the optical cable. Therefore, it is necessary to control the twisting pitch of the induction electric unit 4 to ensure that the wires of the induction electric unit 4 do not contact each other along the axial direction of the reinforcing core 3.

[0061] As another optional embodiment of the present invention, the remotely inspectable optical cable in the present application includes a reinforcing core 3, and the optical unit and the inductive electric unit 4 are twisted together and arranged on the outer periphery of the reinforcing core 3. The inductive electric unit 4 is arranged in a form similar to a filling rope and is twisted together with the optical unit. Since the inductive electric unit 4 is twisted and arranged in a surrounding manner, when any part of the outer sheath 5 of the optical cable is damaged in any circumferential direction, the inductive electric unit 4 is damaged and exposed at the corresponding part, thereby realizing accurate perception of the damaged part.

[0062] Further, as a preferred embodiment of the present invention, the induction electric unit 4 in the present application includes a bare wire, and the outer periphery of the bare wire is coated with an insulating layer, and the insulating layer is soluble in an alkaline solution after a set light exposure time. When the outer sheath 5 of the optical cable is damaged, the damage is mainly sensed by the induction electric unit 4. Therefore, it is not appropriate to set a protective layer around the wire to avoid the problem that the protective layer is not damaged after the outer sheath 5 is damaged, resulting in the problem that the damaged part cannot be detected. The exposed wire will cause the surrounding wires to contact each other, causing TDR perception errors. Therefore, the present application coats an insulating layer on the outer periphery of the bare wire and controls the composition of the insulating layer so that the insulating layer dissolves quickly when it comes into contact with the outside, thereby ensuring the accurate perception of the wire to the external air. Preferably, the illumination in the present application includes ultraviolet light in the 220-500nm band. Preferably, the set time in the present application is adjustable according to the thickness of the insulating layer, and can be selected as 2h, 3h or 4h, etc. Preferably, when the illumination time is 4h or more, the insulating layer in the illuminated area is basically completely dissolved in the alkaline solution, so that the damage of the inductive electrical unit can be detected.

[0063] Optionally, the alkaline solution in the present application is mainly formed by filling alkaline substances such as soda lime, calcium oxide, calcium hydroxide, sodium oxide, sodium hydroxide, potassium oxide, potassium hydroxide, lithium oxide or lithium hydroxide in the sheath or in the insulating layer, or substances that become alkaline after absorbing water, and absorbing water in the air to form an alkaline solution. Specifically, soda lime is a mixture, which includes about 75% calcium oxide, about 3% sodium hydroxide, and about 1% potassium hydroxide. In the remotely inspectable optical cable in the present application, the sodium hydroxide powder added inside the optical cable can be replaced by the above-mentioned alkaline substances or substances that become alkaline after absorbing water.

[0064] Further, as an optional embodiment of the present invention, the insulating layer in the present application is filled with 2,1,5-sulfonyl chloride and sodium hydroxide powder. When the outer sheath 5 of the optical cable is damaged, the 2,1,5-sulfonyl chloride in the insulating layer reacts under light to form ketene, and the sodium hydroxide powder absorbs moisture in the air to form weak alkaline water. Ketene reacts with water to form indene carboxylic acid that dissolves in weak alkaline water, causing the insulation layer of the wire at the corresponding part to disappear, thereby causing the property of the insulating medium at that part to change, so that it can be sensed by the TDR instrument, and then the damaged part of the optical cable is obtained.

[0065] Further, as an optional embodiment of the present invention, the insulating layer is filled with 2,1,5-sulfonyl chloride, and the space between the outer sheath 5 and the inductive electric unit 4 is filled with sodium hydroxide powder. The insulating layer is only filled with 2,1,5-sulfonyl chloride, and then the sodium hydroxide powder between the outer sheath 5 and the inductive electric unit 4 absorbs water to form weak alkaline water to dissolve the insulating layer, so that the wire is directly exposed.

[0066] Further, as an optional embodiment of the present invention, the induction unit 4 is also a bare wire, but the outer periphery of the bare wire is coated with a mesh insulation layer. Here, the mesh insulation layer has a certain thickness, which can prevent the adjacent bare wires from directly contacting each other, and allow some bare wires to directly contact the outside air after the outer sheath 5 is damaged. Optionally, the mesh insulation layer can be a foam material.

[0067] As an optional embodiment of the present invention, the remotely inspectable optical cable in the present application may be a stranded cable, a skeleton cable, a central tube cable or an air-blown micro cable.

[0068] Further preferably, the optical unit in the present application includes at least one optical fiber 1, the outer periphery of the optical fiber 1 is coated with a sleeve 2, and the Duerhardness value of the sleeve 2 is between 30 and 85. Since the bare wire itself is relatively thin, in order to prevent the sleeve 2 from being directly cut by the bare wire, a sleeve 2 with a Duerhardness between 30 and 85 is used to effectively protect the optical fiber 1 inside it. Optionally, the sleeve 2 in the present application can be prepared by one of PP, PBT, TPEE or PET, and can also be prepared by blending PBT or PET, as long as the sleeve 2 prepared by the above materials meets the hardness requirements.

[0069] Further, as a preferred embodiment of the present invention, the wire in the present application can be made of one or more materials selected from copper, gold, silver, aluminum, semiconductor or superconductor. The wire in the present application only needs to be in a conducting state when detected by a TDR instrument.

[0070] Based on the above-mentioned remotely inspectable optical cable, the present application also includes a method for preparing a remotely inspectable optical cable, which comprises the following steps:

[0071] S1, obtaining light unit and induction electric unit 4;

[0072] S2, pulling the reinforcing core 3, twisting a plurality of optical units and arranging them on the periphery of the reinforcing core 3, and twisting the induction electric units 4 and arranging them on the periphery of the plurality of reinforcing cores 3;

[0073] S3. Extruding an outer sheath 5 on the outer periphery of the reinforcing core 3.

[0074] Furthermore, the preparation process of the above-mentioned induction electric unit 4 is as follows:

[0075] Dissolving 2,1,5-sulfonyl chloride and phenolic resin in anhydrous ethanol to form a coating solution;

[0076] Selecting a conductor and immersing the conductor in a coating solution;

[0077] The wire is dried by a hot air device to obtain an induction electric unit 4 with an insulating layer.

[0078] When the wire is dried by the hot air device, the anhydrous ethanol is volatilized, and the phenolic resin containing 2,1,5-sulfonyl chloride is coated on the outer periphery of the wire to form an induction unit 4 with an insulating layer.

[0079] Furthermore, the insulating layer containing 2,1,5-sulfonyl chloride needs to be dissolved after contacting a weak alkaline solution, so it is also necessary to spray sodium hydroxide powder on the periphery of the twisted induction electric unit 4. It is worth noting that after the sodium hydroxide powder is sprayed on the periphery of the induction electric unit 4, a water-blocking yarn or a water-blocking tape can be used to directly cover the periphery of the sodium hydroxide powder to prevent the sodium hydroxide from absorbing moisture in the air and directly forming a weak alkaline solution.

[0080] Optionally, the inductive electrical unit 4 with an insulating layer in the present application and the twisting with the optical unit are both carried out in a closed space. After the twisting is completed and after the sodium hydroxide powder is sprayed, the water-blocking yarn is twisted and coated at the outlet end of the closed space to block external light and air.

[0081] Further preferably, the mass ratio of the above-mentioned 2,1,5-sulfonyl chloride to the phenolic resin is 1:2-5; the sodium hydroxide powder accounts for 3% to 10% of the total mass ratio of the insulating layer. Specifically, the mass ratio of 2,1,5-sulfonyl chloride to the phenolic resin is 1:2-5. The insulating layer formed under this ratio can make the insulating layer around the conductor basically completely damaged after the reaction of 2,1,5-sulfonyl chloride, which is convenient for the TDR instrument to sense the damage. The sodium hydroxide powder accounts for 3% to 10% of the total mass ratio of the insulating layer, so that when the sodium hydroxide absorbs water to form an alkaline solution, it can ensure that the enone formed by 2,1,5-sulfonyl chloride is dissolved.

[0082] Further, as an optional embodiment of the present invention, the preparation process of the induction electric unit 4 in the present application is as follows:

[0083] Traction wire;

[0084] High-density polyethylene is used as a base material, and 2,1,5-sulfonyl chloride and sodium hydroxide powder are added to the base material to form a sleeve 2 material;

[0085] Extruding a sleeve 2 around the outer periphery of the conductor;

[0086] The sleeve 2 is cooled and shaped by air cooling.

[0087] In addition to the composite structure of phenolic resin and 2,1,5-sulfonyl chloride formed on the periphery of the conductor, a sleeve 2 structure containing 2,1,5-sulfonyl chloride and sodium hydroxide powder can also be directly prepared on the periphery of the conductor.

[0088] Furthermore, the present application also includes a detection method for remotely inspectable optical cables, which is used to detect damage to the remotely inspectable optical cables in the present application, as follows:

[0089] A TDR instrument is used to input a pulse signal to the induction electrical unit 4;

[0090] Obtain the propagation time and reflection waveform of the pulse signal in the cable;

[0091] Whether the optical cable can be remotely inspected is determined based on the reflected waveform, and the damaged position of the optical cable can be remotely inspected is determined based on the propagation time.

[0092] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A remotely inspectable optical cable, characterized in that: include: An optical unit, an inductive electric unit and an outer sheath, wherein the optical unit and the inductive electric unit are both arranged in the outer sheath, and the inductive electric unit contacts with the external environment when the outer sheath is damaged.

2. The remotely inspectable optical cable according to claim 1, characterized in that: The induction electric unit comprises a bare wire, the outer periphery of which is coated with an insulating layer, and the insulating layer can be dissolved in an alkaline solution after being exposed to light for a set time.

3. The remotely inspectable optical cable according to claim 2, characterized in that: The insulating layer is filled with 2,1,5-sulfonyl chloride and sodium hydroxide powder.

4. The remotely inspectable optical cable according to claim 2, characterized in that: The insulating layer is filled with 2,1,5-sulfonyl chloride, and the space between the outer sheath and the induction unit is filled with sodium hydroxide powder.

5. The remotely inspectable optical cable according to any one of claims 1 to 4, characterized in that: Also includes: Strengthen the core; There are multiple optical units, and the multiple optical units are twisted and wound around the outer periphery of the reinforcing core; The inductive electric unit is twisted and wound around the outer circumferences of the plurality of optical units.

6. The remotely inspectable optical cable according to claim 5, characterized in that: The conductive wires of the induction electric unit do not contact each other along the axial direction of the reinforcing core.

7. The remotely inspectable optical cable according to any one of claims 1 to 4, characterized in that: Also includes: Strengthen the core; There are a plurality of optical units, and the inductive electrical unit is twisted together with the plurality of optical units and arranged on the outer periphery of the reinforcing core.

8. The remotely inspectable optical cable according to any one of claims 1 to 4, characterized in that: The optical unit comprises at least one optical fiber, the outer periphery of the optical fiber is covered with a sleeve, and the DuPont hardness value of the sleeve is 30-85.

9. The remotely inspectable optical cable according to claim 1, characterized in that: The wire is made of gold, silver, copper or aluminum.

10. A method for detecting a remotely inspectable optical cable, for detecting damage to the remotely inspectable optical cable as claimed in any one of claims 1 to 9, characterized in that: include: A TDR instrument is used to input a pulse signal to the induction electrical unit; Obtain the propagation time and reflection waveform of the pulse signal in the cable; Whether the optical cable can be remotely inspected is determined based on the reflected waveform, and the damaged position of the optical cable can be remotely inspected is determined based on the propagation time.

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