CN115388801B - Submarine cable strain monitoring method and device, computer equipment and storage medium - Google Patents
Submarine cable strain monitoring method and device, computer equipment and storage medium Download PDFInfo
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- CN115388801B CN115388801B CN202211319045.6A CN202211319045A CN115388801B CN 115388801 B CN115388801 B CN 115388801B CN 202211319045 A CN202211319045 A CN 202211319045A CN 115388801 B CN115388801 B CN 115388801B
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
Abstract
The present disclosure relates to a submarine cable strain monitoring method, apparatus, computer device, storage medium and computer program product. The method comprises the following steps: acquiring loop optical fiber data of the submarine cable; determining Brillouin center frequency data of each sampling point of the optical fiber according to the loop optical fiber data; calculating the frequency difference of each sampling point according to the Brillouin central frequency data of each sampling point of the optical fiber, wherein the frequency difference comprises the difference between different Brillouin central frequencies at the same position; and determining a strain monitoring result of the submarine cable according to a preset difference threshold and the frequency difference. By adopting the method, the strain degree of the submarine cable can be effectively monitored, and the strain degree of the submarine cable can be judged.
Description
Technical Field
The present disclosure relates to the field of submarine cable technology, and in particular, to a submarine cable strain monitoring method, apparatus, computer device, storage medium, and computer program product.
Background
With the gradual popularization of the photoelectric composite submarine cable in the fields of power transmission and data communication and the development and application of the distributed optical fiber sensing technology, a distributed optical fiber temperature/strain sensing system based on the optical fiber brillouin effect has become one of the common means for monitoring the operating state of the submarine cable. Among them, a distributed Brillouin optical fiber temperature/strain sensing system (BOTDA) based on Brillouin Optical Time Domain Analysis (BOTDA) is one of the mainstream technical means at home and abroad at present to monitor the temperature/strain along a long-distance optical cable.
In the BOTDA system, two pulsed light and continuous light with a frequency difference close to the fiber Brillouin frequency need to be injected into two ends of a sensing fiber respectively, so that the pulsed light and the continuous light are transmitted in opposite directions in a sensing optical path, and in the process of meeting the two beams, due to Stimulated Brillouin Scattering (SBS), energy exchange occurs between the two beams. In order to increase the sensing distance, a loss-type BOTDA system is generally adopted, that is, the pulse light frequency is low, the continuous light frequency is high, and the continuous light transfers the light energy to the pulse light. When the difference between the two frequencies is just the Brillouin frequency of the optical fiber, the energy transfer effect is strongest. By sweeping the frequency of the continuous light near the Brillouin frequency and monitoring the power change of the continuous light subjected to the SBS action through the photoelectric detector, the Brillouin loss spectrum in the shape of a Lorentz curve can be obtained, and the center of the Lorentz curve is the Brillouin frequency. When the temperature/strain in the optical fiber changes, brillouin frequency moves, and temperature/strain sensing can be realized by demodulating the Brillouin frequency.
However, due to the key parameters monitored by the BOTDA system: the optical fiber brillouin frequency is sensitive to the temperature and strain of the optical fiber, so how to decouple the temperature and strain sensing data is one of the research directions in academia. In the field of submarine cable application, no mature engineering solution exists at present. In the scientific research field, the following methods are often used for decoupling the temperature and strain of the BOTDA system: (1) A DTS system based on the optical fiber Raman scattering technology is adopted for temperature compensation, and the DTS system is only sensitive to temperature; (2) Analyzing by using a plurality of Brillouin frequency peak phenomena of special optical fibers (large-effective-area optical fibers, polarization maintaining optical fibers and photonic crystal optical fibers), and respectively calculating the sensitivity coefficients of different peaks to temperature and strain; (3) In addition to the Brillouin frequency, decoupling temperature and strain data by using the change of the amplitude (namely light intensity) of a Brillouin optical signal as a second parameter; (4) By utilizing the loose-sleeve optical fiber and the tight-sleeve optical fiber which are arranged in parallel, oil is filled in the loose-sleeve optical fiber, the strain on the optical fiber is reduced, and the strain effect in the loose-sleeve optical fiber is ignored. However, the technical means in the scientific research field have limitations in the application occasions of submarine cable monitoring engineering, and the submarine cable strain cannot be effectively monitored and judged.
Disclosure of Invention
Based on this, there is a need to provide a submarine cable strain monitoring method, apparatus, computer device, computer readable storage medium and computer program product capable of monitoring submarine cable strain anomalies.
In a first aspect, the present disclosure provides a method of strain monitoring a submarine cable. The method comprises the following steps:
acquiring loop optical fiber data of the submarine cable;
determining Brillouin center frequency data of each sampling point of the optical fiber according to the loop optical fiber data;
calculating the frequency difference of each sampling point according to the Brillouin center frequency data of each sampling point of the optical fiber, wherein the frequency difference comprises the difference between different Brillouin center frequencies at the same position;
and determining a submarine cable strain monitoring result according to a preset difference threshold and the frequency difference.
In one embodiment, the optical fiber includes a first optical unit and a second optical unit, and the calculating the frequency difference value of each sampling point according to the brillouin center frequency data of each sampling point of the optical fiber includes:
determining the position of each sampling point of the first optical unit according to the Brillouin center frequency data of each sampling point of the first optical unit;
and determining the corrected Brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit according to the Brillouin center frequency data of each sampling point of the second optical unit.
In one embodiment, the determining, according to the brillouin center frequency data of each sampling point of the second optical unit, the modified brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit includes:
processing the Brillouin center frequency data of each sampling point of the second optical unit by using an interpolation algorithm, and determining the corrected Brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit.
In one embodiment, the locations of the sample points are determined by the following equation:
L=[Δt×(c/n)×N]/2
wherein L represents the optical unit length, N represents the refractive index of the optical fiber, c represents the speed of light in vacuum, Δ t represents the data sampling interval, N represents the number of sampling points, the positions of the sampling points are represented as L (x/N), where x represents the position order of the sampling points.
In one embodiment, the preset difference threshold value meets the frequency range of 5MHz to 10MHz.
In one embodiment, the method further comprises:
and when the frequency difference value of the sampling point is greater than the preset difference value threshold value, sending out submarine cable strain alarm information, wherein the submarine cable strain alarm information comprises strain abnormal positions.
In a second aspect, the present disclosure also provides a submarine cable strain monitoring device. The device comprises:
the data acquisition module is used for acquiring loop optical fiber data of the submarine cable;
the data demodulation module is used for determining Brillouin central frequency data of each sampling point of the optical fiber according to the loop optical fiber data;
the data calculation module is used for calculating the frequency difference of each sampling point according to the Brillouin center frequency data of each sampling point of the optical fiber, wherein the frequency difference comprises the difference between different Brillouin center frequencies at the same position;
and the result determining module is used for determining the strain monitoring result of the submarine cable according to a preset difference threshold and the frequency difference.
In one embodiment, the optical fiber comprises a first optical unit and a second optical unit, and the data calculation module is configured to determine the position of each sampling point of the first optical unit according to brillouin center frequency data of each sampling point of the first optical unit; and determining the corrected Brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit according to the Brillouin center frequency data of each sampling point of the second optical unit.
In one embodiment, the data calculation module is configured to process the brillouin center frequency data of each sampling point of the second optical unit by using an interpolation algorithm, and determine modified brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit.
In one embodiment, the data calculation module determines the location of the sample point by the following equation:
L=[Δt×(c/n)×N]/2
wherein L represents the optical unit length, N represents the refractive index of the optical fiber, c represents the speed of light in vacuum, Δ t represents the data sampling interval, N represents the number of sampling points, the positions of the sampling points are represented as L (x/N), where x represents the position order of the sampling points.
In one embodiment, the apparatus further comprises:
and the alarm module is used for sending out submarine cable strain alarm information when the frequency difference value of the sampling point is greater than the preset difference threshold value, wherein the submarine cable strain alarm information comprises a strain abnormal position.
In a third aspect, the present disclosure also provides a computer device. The computer device comprises a memory storing a computer program and a processor implementing the following steps when executing the computer program:
acquiring loop optical fiber data of the submarine cable;
determining Brillouin center frequency data of each sampling point of the optical fiber according to the loop optical fiber data;
calculating the frequency difference of each sampling point according to the Brillouin central frequency data of each sampling point of the optical fiber, wherein the frequency difference comprises the difference between different Brillouin central frequencies at the same position;
and determining a strain monitoring result of the submarine cable according to a preset difference threshold and the frequency difference.
In a fourth aspect, the present disclosure also provides a computer-readable storage medium. The computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
acquiring loop optical fiber data of the submarine cable;
determining Brillouin center frequency data of each sampling point of the optical fiber according to the loop optical fiber data;
calculating the frequency difference of each sampling point according to the Brillouin central frequency data of each sampling point of the optical fiber, wherein the frequency difference comprises the difference between different Brillouin central frequencies at the same position;
and determining a submarine cable strain monitoring result according to a preset difference threshold and the frequency difference.
In a fifth aspect, the present disclosure also provides a computer program product. The computer program product comprising a computer program which when executed by a processor performs the steps of:
acquiring loop optical fiber data of the submarine cable;
determining Brillouin center frequency data of each sampling point of the optical fiber according to the loop optical fiber data;
calculating the frequency difference of each sampling point according to the Brillouin central frequency data of each sampling point of the optical fiber, wherein the frequency difference comprises the difference between different Brillouin central frequencies at the same position;
and determining a strain monitoring result of the submarine cable according to a preset difference threshold and the frequency difference.
According to the submarine cable strain monitoring method, the device, the computer equipment, the storage medium and the computer program product, the Brillouin central frequency data of each sampling point of the optical fiber is obtained by processing the loop optical fiber data, the frequency difference value of each sampling point is calculated according to the Brillouin central frequency data of each sampling point of the optical fiber, the frequency difference value is compared with the preset difference threshold value, the strain degree of the submarine cable is determined, and the beneficial effects of effectively monitoring the strain degree of the submarine cable and judging the strain degree of the submarine cable can be achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure and are not to be construed as limiting the disclosure.
FIG. 1 is a diagram of an embodiment of an environment in which a method for strain monitoring of an undersea cable is used;
FIG. 2 is a schematic flow diagram of a method of strain monitoring of an undersea cable according to one embodiment;
FIG. 3 is a schematic cross-sectional view of an embodiment of a submarine cable;
FIG. 4 is a diagram of an environment in which an embodiment of a submarine cable is used;
FIG. 5 is a diagram illustrating the data line modification step of the optical cell in one embodiment;
FIG. 6 is a block diagram of the structure of a submarine cable strain monitoring device according to one embodiment;
FIG. 7 is a diagram of the internal structure of a computer device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the disclosure and are not intended to limit the disclosure.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are capable of operation in sequences other than those illustrated or otherwise described herein. The implementations described in the exemplary embodiments below do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The submarine cable strain monitoring method provided by the embodiment of the disclosure can be applied to the application environment shown in fig. 1. Wherein the data storage system may store data that the server 104 needs to process. The data storage system may be integrated on the server 104, or may be located on the cloud or other network server. The server 104 has a data acquisition end that can acquire loop fiber data of the undersea cable. And the server 104 determines Brillouin center frequency data of each sampling point of the optical fiber according to the loop optical fiber data. The server 104 calculates a frequency difference of each sampling point according to the brillouin center frequency data of each sampling point of the optical fiber, where the frequency difference includes a difference between a first brillouin center frequency and a second brillouin center frequency at the same position. And the server 104 determines the strain monitoring result of the submarine cable according to the preset difference threshold and the frequency difference. The server 104 may be implemented by an independent server or a server cluster composed of a plurality of servers.
In one embodiment, as shown in fig. 2, a submarine cable strain monitoring method is provided, which is described by taking the application environment of fig. 1 as an example, and comprises the following steps:
s202, loop optical fiber data of the submarine cable are obtained.
The loop fiber data may refer to fiber data including outbound fiber data and inbound fiber data.
Specifically, the loop fiber data includes at least outbound fiber data and backhaul fiber data of the submarine cable on the seafloor. Loop fiber data may be obtained from a database or BOTDA system, including outbound fiber data and backhaul fiber data, i.e., sample data obtained from at least two fibers at the same sampling point on the undersea cable. The sensing optical fiber in the submarine cable can form a loop, and 1 core is respectively taken as an outbound sensing optical fiber and a return sensing optical fiber in two different optical units of the submarine cable. The outbound fiber data may be acquired using the outbound sensing fiber and the return fiber data may be acquired using the return sensing fiber.
And S204, determining Brillouin central frequency data of each sampling point of the optical fiber according to the loop optical fiber data.
Specifically, the loop optical fiber data may be mediated by a BOTDA system or other methods, so as to obtain brillouin center frequency data of each sampling point of the optical fiber. According to the Brillouin center frequency data of each sampling point of the optical fiber, a Brillouin center frequency curve of the optical fiber can be drawn.
And S206, calculating the frequency difference of each sampling point according to the Brillouin center frequency data of each sampling point of the optical fiber, wherein the frequency difference comprises the difference between different Brillouin center frequencies at the same position.
Wherein the frequency difference value represents the difference between the frequencies.
In particular, each sample point of the fiber has at least two brillouin center frequencies, for example at least one brillouin center frequency derived from the outbound fiber data and one brillouin center frequency derived from the inbound fiber data. By calculation, the difference between different brillouin center frequencies at the same position can be calculated. The frequency difference is generally a positive value or zero, and when the frequency difference is a negative value, the value is generally processed to be a positive value by taking an absolute value. It should be noted that the same sampling point may correspond to a plurality of brillouin center frequencies, and when one sampling point corresponds to 3 or more brillouin center frequencies, the frequency difference may be obtained by mutually subtracting the plurality of brillouin center frequencies and then calculating an average value of the differences, and at this time, according to actual needs, other frequency difference calculation methods may also be used, for example, a median value among the plurality of differences may be used as the frequency difference.
And S208, determining a strain monitoring result of the submarine cable according to a preset difference threshold and the frequency difference.
The preset difference threshold may be a frequency threshold preset according to a corresponding relationship between the strain degree of the submarine cable and the frequency difference.
Specifically, the preset difference threshold may provide a reference for determining the strain magnitude of the submarine cable represented by the frequency difference value. And according to the preset difference threshold and the frequency difference, the strain degree of each sampling point of the submarine cable can be judged. For example, the preset difference threshold may be used as a strain warning value of the submarine cable, the percentage of the frequency difference value in the preset difference threshold is calculated through division, and then the percentage is used to represent the strain degree of the submarine cable at the corresponding sampling point. The submarine cable strain monitoring result may include the strain degree of each sampling point of the submarine cable, and may also include the preset difference threshold, the frequency difference, and the like.
According to the submarine cable strain monitoring method, the Brillouin central frequency data of each sampling point of the optical fiber is obtained by processing the loop optical fiber data, the frequency difference value of each sampling point is calculated according to the Brillouin central frequency data of each sampling point of the optical fiber, the frequency difference value is compared with the preset difference threshold value, the strain degree of the submarine cable is determined, and the beneficial effects of effectively monitoring the strain degree of the submarine cable and judging the strain degree of the submarine cable can be achieved.
In one embodiment, the optical fiber includes a first optical unit and a second optical unit, and the calculating the frequency difference value of each sampling point according to the brillouin center frequency data of each sampling point of the optical fiber includes:
determining the position of each sampling point of the first optical unit according to Brillouin center frequency data of each sampling point of the first optical unit;
and determining the corrected Brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit according to the Brillouin center frequency data of each sampling point of the second optical unit.
The first light unit and the second light unit are only used for distinguishing different optical fibers.
Specifically, the optical fiber includes a first optical unit and a second optical unit, and the brillouin center frequency data of each sampling point of the optical fiber includes: brillouin center frequency data of each sampling point of the first optical unit and Brillouin center frequency data of each sampling point of the second optical unit. Due to the limitation of the manufacturing process of the submarine cable, the sampling point position of the outbound sensing fiber and the sampling point position of the return sensing fiber generally do not correspond to each other, that is, the sampling point position of the outbound sensing fiber and the sampling point position of the return sensing fiber do not coincide with each other, and at this time, the sampling point position of one of the sensing fibers needs to be corrected. In this embodiment, the first optical unit and the second optical unit are used to distinguish the outbound sensing fiber from the return sensing fiber, specifically, the first optical unit may be used to refer to the outbound sensing fiber, the second sensing fiber may be used to refer to the return sensing fiber, the first optical unit may also be used to refer to the return sensing fiber, and the second sensing fiber may be used to refer to the outbound sensing fiber, so as to distinguish the two fibers. The Brillouin center frequency data comprises sampling point information, and the position of each sampling point of the first optical unit is determined according to the Brillouin center frequency data of each sampling point of the first optical unit. And determining the corrected Brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit according to the Brillouin center frequency data of each sampling point of the second optical unit. Firstly, the sampling point position of the first optical unit is used as a new sampling point position of the second optical unit, and then the Brillouin center frequency data at the new sampling point position, namely the corrected Brillouin center frequency data, is determined in an estimation mode according to the Brillouin center frequency data of each sampling point of the second optical unit.
In the embodiment, the corrected Brillouin central frequency data of the second optical unit is determined, so that the frequency difference can be calculated more accurately according to the situation that the sampling points of different sensing optical fibers do not correspond to each other, and the beneficial effect of monitoring the strain situation of the submarine cable more accurately is achieved.
In one embodiment, the determining, according to the brillouin center frequency data of each sampling point of the second optical unit, the corrected brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit includes:
processing the Brillouin center frequency data of each sampling point of the second optical unit by using an interpolation algorithm, and determining the corrected Brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit.
The interpolation algorithm may refer to an algorithm for performing interpolation.
Specifically, the interpolation algorithm may be an algorithm for performing linear interpolation, or an algorithm for performing parabolic interpolation, and an algorithm based on other interpolation methods may also be used according to a time requirement. And processing the Brillouin center frequency data of each sampling point of the second optical unit by using an interpolation algorithm, and estimating the Brillouin center frequency data of the second optical unit at the sampling point position of the first optical unit, wherein the estimation result is called as corrected Brillouin center frequency data.
In the embodiment, the corrected Brillouin center frequency data is determined by using the interpolation algorithm, so that the frequency difference can be calculated more accurately according to the situation that the sampling points of different sensing optical fibers do not correspond to each other, and the beneficial effect of more accurately monitoring the strain situation of the submarine cable is achieved.
In one embodiment, the locations of the sample points are determined by the following equation:
L=[Δt×(c/n)×N]/2
wherein L represents the optical unit length, N represents the refractive index of the optical fiber, c represents the speed of light in vacuum, Δ t represents the data sampling interval, N represents the number of sampling points, the positions of the sampling points are represented as L (x/N), where x represents the position order of the sampling points.
In particular, since the submarine cable can be considered to be one-dimensional linear, the position order of the sampling points can be used to represent the positions of the sampling points. First, the length of the optical unit is expressed by the number of sampling points, specifically, L = [ Δ t × (c/N) × N ]/2, and then the position of the xth sampling point can be expressed as L (x/N). For example, the position of the first sample point may be represented as L (1/N), the position of the second sample point may be represented as L (2/N), and the position of the nth sample point may be represented as L (N/N). According to time requirements, the positions of the sampling points in the loop optical fiber data can be sequenced according to the distance from one end point of the optical fiber, so that the position sequence of the sampling points of each optical fiber is determined.
In the embodiment, the positions of the sampling points are represented by using the position sequence of the sampling points, so that the beneficial effects of quickly determining the positions of the sampling points in the correlation calculation of the Brillouin center frequency and further quickly determining the strain monitoring result of the submarine cable can be realized.
In one embodiment, the preset difference threshold value meets the frequency range of 5MHz to 10MHz.
In the embodiment, the range of the preset difference threshold value is limited, so that the beneficial effects of reasonably determining the preset difference threshold value and further correctly processing the frequency difference value to determine the strain monitoring result of the submarine cable can be achieved.
In one embodiment, the method further comprises:
and when the frequency difference of the sampling points is greater than the preset difference threshold value, submarine cable strain alarm information is sent out and comprises strain abnormal positions.
In the embodiment, when the frequency difference value of the sampling point is greater than the preset difference value threshold, the submarine cable strain alarm information is sent, and the strain abnormal position is reported, so that the beneficial effect that relevant processing personnel can obtain the submarine cable strain information in time to process in time can be achieved.
In one embodiment, a cross-sectional view of an undersea cable may be as shown in fig. 3, the cable including three electrical cores (referred to as a-phase, B-phase, C-phase, respectively) and two optical units (referred to as optical unit a, optical unit B, respectively). The optical fibers contained within each optical unit typically range from 36 to 48 cores. One application environment of the submarine cable is shown in fig. 4, the land side and the offshore platform/island side are connected through the submarine cable, and the BOTDA submarine cable monitoring system on the land side has a pulsed light output port and a continuous light output port. The pulse light output port is connected with the offshore platform/island side through one core of the light unit A, and the continuous light output port is connected with the offshore platform/island side through one core of the light unit B. One of the cores of the light unit a and one of the cores of the light unit B are fused at the offshore platform/island side. As shown in fig. 5, the light unit a is indicated by a line segment L1, the light unit B is indicated by a line segment L2, and the node on the line segment indicates the position of the sampling point. After the data correction, the corrected light unit B is indicated by a line segment L2 #. The solid line node in the line segment L2# corresponds to the node in the line segment L2, and the node generated by the line segment L2# and the dotted line indicated by the arrow in the figure corresponds to the same sampling point as the node in the line segment L1 connected by the same dotted line.
It should be understood that, although the steps in the flowcharts related to the embodiments as described above are sequentially displayed as indicated by arrows, the steps are not necessarily performed sequentially as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the flowcharts related to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least a part of the steps or stages in other steps.
Based on the same inventive concept, the embodiment of the disclosure also provides a submarine cable strain monitoring device for implementing the submarine cable strain monitoring method. The solution provided by the device is similar to the solution described in the above method, so the specific limitations in one or more embodiments of the submarine cable strain monitoring device provided below can be referred to the limitations in the above submarine cable strain monitoring method, and are not described herein again.
Based on the description of the above embodiment of the submarine cable strain monitoring method, the present disclosure also provides a submarine cable strain monitoring device. The apparatus may include systems (including distributed systems), software (applications), modules, components, servers, clients, etc. that use the methods described in embodiments of the present specification in conjunction with any necessary apparatus to implement the hardware. Based on the same innovative concept, the embodiments of the present disclosure provide an apparatus in one or more embodiments as described in the following embodiments. Since the implementation scheme of the apparatus for solving the problem is similar to that of the method, the specific implementation of the apparatus in the embodiment of the present specification may refer to the implementation of the foregoing method, and repeated details are not repeated. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
In one embodiment, as shown in fig. 6, there is provided a submarine cable strain monitoring device comprising: a data acquisition module 602, a data demodulation module 604, a data calculation module 606, and a result determination module 608, wherein:
a data acquisition module 602, configured to acquire loop fiber data of the submarine cable;
the data demodulation module 604 is configured to determine brillouin center frequency data of each sampling point of the optical fiber according to the loop optical fiber data;
a data calculating module 606, configured to calculate a frequency difference of each sampling point according to the brillouin center frequency data of each sampling point of the optical fiber, where the frequency difference includes a difference between different brillouin center frequencies at the same position;
and a result determining module 608, configured to determine a submarine cable strain monitoring result according to a preset difference threshold and the frequency difference.
In one embodiment, the optical fiber includes a first optical unit and a second optical unit, and the data calculation module 606 is configured to determine the position of each sampling point of the first optical unit according to the brillouin center frequency data of each sampling point of the first optical unit; and determining the corrected Brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit according to the Brillouin center frequency data of each sampling point of the second optical unit.
In one embodiment, the data calculation module 606 is configured to process the brillouin center frequency data of each sampling point of the second optical unit by using an interpolation algorithm, and determine modified brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit.
In one embodiment, the data calculation module 606 determines the locations of the sample points by the following equation:
L=[Δt×(c/n)×N]/2
wherein L represents the length of an optical unit, N represents the refractive index of an optical fiber, c represents the speed of light in vacuum, Δ t represents the data sampling interval, N represents the number of sampling points, and the positions of the sampling points are represented as L (x/N), wherein x represents the position sequence of the sampling points.
In one embodiment, the apparatus further comprises:
and the alarm module is used for sending out submarine cable strain alarm information when the frequency difference value of the sampling point is greater than the preset difference threshold value, wherein the submarine cable strain alarm information comprises a strain abnormal position.
In one embodiment, the preset difference threshold stored in the result determination module 608 satisfies the frequency range of 5mhz to 10mhz.
The various modules in the submarine cable strain monitoring apparatus described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 7. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing submarine cable data and related data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of submarine cable strain monitoring.
Those skilled in the art will appreciate that the architecture shown in fig. 7 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is further provided, which includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method embodiments when executing the computer program.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
acquiring loop optical fiber data of the submarine cable;
determining Brillouin center frequency data of each sampling point of the optical fiber according to the loop optical fiber data;
calculating the frequency difference of each sampling point according to the Brillouin central frequency data of each sampling point of the optical fiber, wherein the frequency difference comprises the difference between different Brillouin central frequencies at the same position;
and determining a strain monitoring result of the submarine cable according to a preset difference threshold and the frequency difference.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
determining the position of each sampling point of the first optical unit according to Brillouin center frequency data of each sampling point of the first optical unit;
and determining the corrected Brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit according to the Brillouin center frequency data of each sampling point of the second optical unit.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
processing the Brillouin center frequency data of each sampling point of the second optical unit by using an interpolation algorithm, and determining the corrected Brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
the position of the sampling point is determined by the following formula:
L=[Δt×(c/n)×N]/2
wherein L represents the optical unit length, N represents the refractive index of the optical fiber, c represents the speed of light in vacuum, Δ t represents the data sampling interval, N represents the number of sampling points, the positions of the sampling points are represented as L (x/N), where x represents the position order of the sampling points.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and setting the preset difference threshold to meet the frequency range of 5MHz to 10MHz.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and when the frequency difference value of the sampling point is greater than the preset difference value threshold value, sending out submarine cable strain alarm information, wherein the submarine cable strain alarm information comprises strain abnormal positions.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring loop optical fiber data of the submarine cable;
determining Brillouin center frequency data of each sampling point of the optical fiber according to the loop optical fiber data;
calculating the frequency difference of each sampling point according to the Brillouin central frequency data of each sampling point of the optical fiber, wherein the frequency difference comprises the difference between different Brillouin central frequencies at the same position;
and determining a strain monitoring result of the submarine cable according to a preset difference threshold and the frequency difference.
In one embodiment, the computer program when executed by the processor further performs the steps of:
determining the position of each sampling point of the first optical unit according to Brillouin center frequency data of each sampling point of the first optical unit;
and determining the corrected Brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit according to the Brillouin center frequency data of each sampling point of the second optical unit.
In one embodiment, the computer program when executed by the processor further performs the steps of:
processing the Brillouin center frequency data of each sampling point of the second optical unit by using an interpolation algorithm, and determining the corrected Brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit.
In one embodiment, the computer program when executed by the processor further performs the steps of:
the position of the sampling point is determined by the following formula:
L=[Δt×(c/n)×N]/2
wherein L represents the optical unit length, N represents the refractive index of the optical fiber, c represents the speed of light in vacuum, Δ t represents the data sampling interval, N represents the number of sampling points, the positions of the sampling points are represented as L (x/N), where x represents the position order of the sampling points.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and setting the preset difference threshold value to meet the frequency range of 5MHz to 10MHz.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and when the frequency difference value of the sampling point is greater than the preset difference value threshold value, sending out submarine cable strain alarm information, wherein the submarine cable strain alarm information comprises strain abnormal positions.
In one embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, performs the steps of:
acquiring loop optical fiber data of the submarine cable;
determining Brillouin center frequency data of each sampling point of the optical fiber according to the loop optical fiber data;
calculating the frequency difference of each sampling point according to the Brillouin central frequency data of each sampling point of the optical fiber, wherein the frequency difference comprises the difference between different Brillouin central frequencies at the same position;
and determining a strain monitoring result of the submarine cable according to a preset difference threshold and the frequency difference.
In one embodiment, the computer program when executed by the processor further performs the steps of:
determining the position of each sampling point of the first optical unit according to Brillouin center frequency data of each sampling point of the first optical unit;
and determining the corrected Brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit according to the Brillouin center frequency data of each sampling point of the second optical unit.
In one embodiment, the computer program when executed by the processor further performs the steps of:
processing the Brillouin center frequency data of each sampling point of the second optical unit by using an interpolation algorithm, and determining the corrected Brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit.
In one embodiment, the computer program when executed by the processor further performs the steps of:
the position of the sampling point is determined by the following formula:
L=[Δt×(c/n)×N]/2
wherein L represents the optical unit length, N represents the refractive index of the optical fiber, c represents the speed of light in vacuum, Δ t represents the data sampling interval, N represents the number of sampling points, the positions of the sampling points are represented as L (x/N), where x represents the position order of the sampling points.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and setting the preset difference threshold value to meet the frequency range of 5MHz to 10MHz.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and when the frequency difference of the sampling points is greater than the preset difference threshold value, submarine cable strain alarm information is sent out and comprises strain abnormal positions.
It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, presented data, etc.) referred to in the present disclosure are information and data that are authorized by the user or sufficiently authorized by each party.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, databases, or other media used in the embodiments provided by the present disclosure may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include a Read-Only Memory (ROM), a magnetic tape, a floppy disk, a flash Memory, an optical Memory, a high-density embedded nonvolatile Memory, a resistive Random Access Memory (ReRAM), a Magnetic Random Access Memory (MRAM), a Ferroelectric Random Access Memory (FRAM), a Phase Change Memory (PCM), a graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others. The databases involved in embodiments provided by the present disclosure may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the embodiments provided in this disclosure may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic, quantum computing based data processing logic, etc., without limitation.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present disclosure, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present disclosure. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the concept of the present disclosure, and these changes and modifications are all within the scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the appended claims.
Claims (10)
1. A method of strain monitoring a submarine cable, the method comprising:
acquiring loop optical fiber data of the submarine cable, wherein the loop optical fiber data comprises outgoing optical fiber data and return optical fiber data;
determining Brillouin center frequency data of each sampling point of the optical fiber according to the loop optical fiber data;
calculating the frequency difference of each sampling point according to Brillouin center frequency data corresponding to each sampling point of the optical fiber and the outbound optical fiber data and Brillouin center frequency data corresponding to the return optical fiber data, wherein the frequency difference comprises the difference between different Brillouin center frequencies at the same position;
and determining a strain monitoring result of the submarine cable according to a preset difference threshold and the frequency difference.
2. The method of claim 1, wherein the optical fiber comprises a first optical unit for acquiring the outbound fiber data, a second optical unit for acquiring the backhaul fiber data;
the calculating the frequency difference of each sampling point according to the brillouin center frequency data corresponding to each sampling point of the optical fiber and the outbound optical fiber data and the brillouin center frequency data corresponding to the return optical fiber data comprises:
determining the position of each sampling point of the first optical unit according to Brillouin center frequency data of each sampling point of the first optical unit;
and determining the corrected Brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit according to the Brillouin center frequency data of each sampling point of the second optical unit.
3. The method according to claim 2, wherein the determining the corrected brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit according to the brillouin center frequency data of each sampling point of the second optical unit comprises:
processing the Brillouin center frequency data of each sampling point of the second optical unit by using an interpolation algorithm, and determining the corrected Brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit.
4. The method of claim 1, wherein the position of the sample points is determined by the formula:
L=[Δt×(c/n)×N]/2
wherein L represents the length of an optical unit, N represents the refractive index of an optical fiber, c represents the speed of light in vacuum, Δ t represents the data sampling interval, N represents the number of sampling points, and the positions of the sampling points are represented as L (x/N), wherein x represents the position sequence of the sampling points.
5. The method as claimed in claim 1, wherein the predetermined difference threshold satisfies a frequency range of 5MHz to 10MHz.
6. The method of claim 1, further comprising:
and when the frequency difference value of the sampling point is greater than the preset difference value threshold value, sending out submarine cable strain alarm information, wherein the submarine cable strain alarm information comprises strain abnormal positions.
7. A submarine cable strain monitoring apparatus, comprising:
the data acquisition module is used for acquiring loop optical fiber data of the submarine cable, wherein the loop optical fiber data comprises outgoing optical fiber data and return optical fiber data;
the data demodulation module is used for determining Brillouin central frequency data of each sampling point of the optical fiber according to the loop optical fiber data;
the data calculation module is used for calculating the frequency difference of each sampling point according to the Brillouin center frequency data corresponding to each sampling point of the optical fiber and the outbound optical fiber data and the Brillouin center frequency data corresponding to the return optical fiber data, wherein the frequency difference comprises the difference between different Brillouin center frequencies at the same position;
and the result determining module is used for determining the strain monitoring result of the submarine cable according to a preset difference threshold and the frequency difference.
8. The apparatus of claim 7, wherein the optical fiber comprises a first optical unit configured to acquire the outbound fiber data, a second optical unit configured to acquire the return fiber data;
the data calculation module is further used for determining the position of each sampling point of the first optical unit according to the Brillouin center frequency data of each sampling point of the first optical unit; and determining the corrected Brillouin center frequency data of the second optical unit with the same sampling point position as the first optical unit according to the Brillouin center frequency data of each sampling point of the second optical unit.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 6.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 6.
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| US5077816A (en) * | 1989-12-26 | 1991-12-31 | United Technologies Corporation | Fiber embedded grating frequency standard optical communication devices |
| JP4225759B2 (en) * | 2002-09-20 | 2009-02-18 | 第一高周波工業株式会社 | Long optical fiber sensor |
| CN102227615B (en) * | 2008-11-27 | 2013-11-27 | 光纳株式会社 | Distributed optical fiber sensor |
| CN101825499B (en) * | 2010-05-18 | 2012-06-06 | 华北电力大学（保定） | Method for measuring sea water temperature profile based on optical fiber Brillouin scattering principle |
| CN108827445B (en) * | 2018-04-27 | 2019-10-29 | 南京航空航天大学 | A kind of fully distributed fiber vibration sensing method and device |
| CN108731714B (en) * | 2018-06-04 | 2019-09-06 | 北京邮电大学 | A kind of coding/decoding method and device of frequency-scan data |
| CN115096350A (en) * | 2021-12-15 | 2022-09-23 | 广东能源集团科学技术研究院有限公司 | Offshore wind farm integrated management system |
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