CN109995426B - Optical cable skin length positioning method and optical fiber vibration detection system - Google Patents
Optical cable skin length positioning method and optical fiber vibration detection system Download PDFInfo
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- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
- G01H9/006—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors the vibrations causing a variation in the relative position of the end of a fibre and another element
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- H04B10/073—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an out-of-service signal
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
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Abstract
The application provides an optical fiber vibration monitoring system based on a method for positioning the skin length of an optical cable. The method for positioning the optical cable skin length utilizes the characteristic that urban underground optical cables are generally laid on two sides of a road and nearby optical cables vibrate when vehicles pass by, so that a vibration energy time domain diagram of the optical cable skin length is obtained. And selecting optical cable positioning characteristic points by analyzing the vibration energy time domain diagram. And determining the geographical position of laying each optical cable positioning feature point according to the optical cable routing laying map and the optical cable laying area map. Thereby generating a corresponding relation table of the cable skin length and the geographic position reflecting the relation between the cable skin length and the geographic position. And determining the geographical position corresponding to the optical cable skin length according to the corresponding relation table of the optical cable skin length and the geographical position. The optical cable skin length positioning method provides data reference for line first-aid repair when an optical cable fails.
Description
Technical Field
The application relates to the field of communication operation and maintenance, in particular to a method for positioning a fiber cable skin length and an optical fiber vibration monitoring system.
Background
With the continuous development of communication technology, communication networks are continuously perfected and developed in various cities, and various cities are gradually covered by complete optical fiber communication networks. In the initial stage of laying the optical cable, the optical cable is convenient to transform in the later stage, and the residual cables are always reserved at certain positions on the line randomly. The random leaving of extra cables in some positions results in no detailed correspondence between the cable skin length and the geographic position in the optical cable laying data. Moreover, during the use of some optical cables, the optical cable path may undergo multiple cuts according to actual needs, which results in a rather unclear correspondence between the cable skin length and the geographic location.
However, the construction of urban infrastructure often causes problems such as optical cable communication failure. Because the optical cable line operation and maintenance personnel do not have the corresponding relation data between the optical cable skin length and the physical position, when the optical cable breaks down, the geographical position corresponding to the optical cable fault point cannot be found in time and rapidly arrives at the accident site for rush repair, and only daily working experience can be used for gradually checking, so that the line rush repair efficiency is seriously influenced.
Aiming at the problem that the geographical position corresponding to the optical cable fault point cannot be found in time when the optical cable is in fault, how to simply and quickly arrange the more accurate corresponding relation data between the optical cable skin length and the geographical position. Therefore, when the optical cable breaks down, the geographical position corresponding to the fault point can be quickly found according to the skin length of the optical cable, so that line operation and maintenance personnel are guided to arrive at the site in time to carry out optical cable line rush repair, and the problem to be solved by the existing urban optical cable operation and maintenance personnel is urgent.
Disclosure of Invention
Therefore, it is necessary to provide an optical fiber vibration monitoring system using a method for locating a fiber sheath length, aiming at the problem that the correspondence between the fiber sheath length and the geographic position is not clear in the conventional technology.
A method of positioning a fiber optic cable jacket length, comprising:
s10, acquiring optical cable vibration signal data to obtain a vibration signal time domain energy diagram of the optical cable;
s20, selecting a plurality of optical cable positioning characteristic points according to the vibration signal time domain energy diagram;
s30, providing the optical cable route laying diagram and the optical cable laying area map, and determining the laying geographic position of each optical cable positioning feature point according to the optical cable route laying diagram and the optical cable laying area map;
and S40, generating a corresponding relation table of the optical cable skin length and the geographic position according to the relation between each optical cable positioning characteristic point and the geographic position laid by each optical cable positioning characteristic point, and determining the geographic position corresponding to the optical cable skin length according to the corresponding relation table of the optical cable skin length and the geographic position.
In one embodiment, the step of acquiring the optical cable vibration signal data includes:
providing a pulse optical signal generator and a vibration signal demodulator, and respectively connecting the starting end of the optical cable to the signal output end of the pulse optical signal generator and the signal input end of the vibration signal demodulator;
using the optical fiber in the optical cable as a sensor, the vibration of the optical cable caused by ground vibration is sensed by the optical fiber;
because the pulsed light that pulse optical signal generator launched is in when propagating in the optic fibre, produce backward rayleigh scattered light constantly, backward rayleigh scattered light carries the vibrations information that the optic fibre sensing was received the vibrations signal demodulator is received to the warp acquire after the demodulation of vibrations signal demodulator the optical cable vibrations signal data.
In one embodiment, the step of acquiring the data of the vibration signal of the optical cable to obtain the time-domain energy map of the vibration signal of the optical cable at S10 includes:
judging whether the vibration signal intensity of each point on the optical cable at each moment in the optical cable vibration signal data is greater than a vibration signal threshold value;
if the intensity of the vibration signal is greater than the vibration signal threshold value, recording the time corresponding to the intensity of the vibration signal and the length of the optical cable skin, wherein the time corresponding to the intensity of the vibration signal and the length of the optical cable skin are a data point;
and acquiring all data points, and generating a vibration signal time-domain energy diagram of the optical cable through the data points.
In one embodiment, the step of selecting the cable positioning feature point comprises:
judging whether the slopes of the vibration source tracks at the two ends of the point to be detected in the vibration signal time domain energy diagram are opposite or not;
and when the positive and negative slopes of the vibration source tracks at the two ends of the point to be detected are opposite, the point to be detected is the optical cable positioning characteristic point.
In one embodiment, when the positive and negative slopes of the vibration source tracks at the two ends of the point to be detected are the same, the point to be detected is reselected, and whether the point to be detected reselected is the optical cable positioning feature point is judged until all the optical cable positioning feature points are determined.
In one embodiment, the geographic position corresponding to the optical cable positioning feature point is a road intersection.
In one embodiment, the S30, providing the cable routing map and the cable routing area map, and the step of determining the geographic location of each cable positioning feature point according to the cable routing map and the cable routing area map includes:
determining the area and the trend of the optical cable laying according to the optical cable routing laying diagram;
providing an optical cable laying area map according to the optical cable laying area;
and determining the geographical position range corresponding to each optical cable positioning feature point according to the optical cable laying trend and the optical cable laying area map.
In one embodiment, the S30, providing the cable routing map and the cable routing area map, and the step of determining the geographic location of each cable positioning feature point according to the cable routing map and the cable routing area map includes:
and determining a road intersection in the geographical position range according to the geographical position range corresponding to each optical cable positioning feature point and according to the optical cable laying area map, wherein the road intersection is the geographical position where the optical cable positioning feature points are laid.
In one embodiment, the step of generating the table of correspondence between the fiber cable skin length and the geographic location further includes:
selecting a first optical cable positioning characteristic point and a second optical cable positioning characteristic point;
acquiring a first geographical position corresponding to the first optical cable positioning feature point and a second geographical position corresponding to the second optical cable positioning feature point according to the optical cable routing and laying map and the optical cable laying area map;
obtaining a first difference value according to the first optical cable positioning characteristic point and the second optical cable positioning characteristic point, and obtaining a second difference value according to the first geographic position and the second geographic position;
obtaining a first proportional coefficient according to the ratio of the first difference to the second difference;
selecting a third geographic location between said first geographic location and said second geographic location;
calculating the distance between the third geographical position and the first geographical position to obtain a third difference value;
obtaining a cable skin length difference between the third geographical position and the first geographical position according to the product of the third difference and the first scale coefficient;
the cable skin length corresponding to the third geographic position is the sum of the cable skin length corresponding to the first optical cable positioning feature point and the cable skin length difference;
and generating a corresponding relation table of the optical cable skin length and the geographic position according to the relation between each optical cable positioning characteristic point and the geographic position laid by each optical cable positioning characteristic point and the relation between the optical cable skin length corresponding to the third geographic position and the third geographic position.
In one embodiment, the step of obtaining the first scaling factor further includes:
the cable skin length corresponding to the first optical cable positioning characteristic point is differenced with the cable skin length corresponding to the second optical cable positioning characteristic point to obtain a first difference value;
calculating the distance between the first geographical position and the second geographical position to obtain a second difference value;
and obtaining a first scale coefficient according to the ratio of the first difference to the second difference.
A fiber optic shock monitoring system comprising:
a pulsed light signal generator that provides a pulsed light signal to the optical cable;
the vibration signal demodulator is used for respectively connecting the starting end of the optical cable to the signal output end of the pulse light signal generator and the signal input end of the vibration signal demodulator when detecting the optical cable vibration signal, and when pulse light emitted by the pulse light signal generator is transmitted in the optical fiber, backward Rayleigh scattering light is continuously generated and carries vibration information sensed by the optical fiber, and the vibration information is received by the vibration signal demodulator and is demodulated by the vibration signal demodulator to obtain optical cable vibration signal data; and
and the processor is electrically connected with the vibration signal demodulator and is used for realizing the step of acquiring the optical cable vibration signal data to obtain the vibration signal time-domain energy diagram of the optical cable in any one of the embodiments.
In one embodiment, the method further comprises the following steps:
a circulator having a first end and a third end;
the first end with pulse optical signal generator connects, the third end with shake signal demodulator connects.
A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method of any of the above embodiments when executing the computer program.
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 of the preceding embodiments.
The application provides an optical fiber vibration monitoring system based on a method for positioning the skin length of an optical cable. The method for positioning the optical cable skin length utilizes the characteristic that urban underground optical cables are generally laid on two sides of a road and nearby optical cables vibrate when vehicles pass by, so that a vibration energy time domain diagram of the optical cable skin length is obtained. And selecting optical cable positioning characteristic points by analyzing the vibration energy time domain diagram. And determining the geographical position of laying each optical cable positioning feature point according to the optical cable routing laying map and the optical cable laying area map. Thereby generating a corresponding relation table of the cable skin length and the geographic position reflecting the relation between the cable skin length and the geographic position. And determining the geographical position corresponding to the optical cable skin length according to the corresponding relation table of the optical cable skin length and the geographical position. The optical cable skin length positioning method provides data reference for line first-aid repair when an optical cable fails.
Drawings
Fig. 1 is a flowchart of a method for positioning a fiber optic cable sheath length according to an embodiment of the present disclosure;
FIG. 2 is a time domain energy diagram of a seismic signal of an optical cable according to an embodiment of the present application;
FIG. 3 is a schematic diagram illustrating a principle of positioning a fiber optic cable sheath length according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of an optical fiber vibration monitoring system according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an optical fiber vibration monitoring system according to an embodiment of the present application.
Description of the main element reference numerals
Optical fiber vibration monitoring system 100
Pulse optical signal generator 10
Laser light generating element 11
Modulating element 12
Drive element 14
Erbium doped fiber amplifier 15
Probe element 21
Acquisition element 22
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
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 application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present application provides a method for positioning a fiber cable sheath length. The optical cable leather length positioning method comprises the following steps:
and S10, acquiring the optical cable vibration signal data to obtain a vibration signal time domain energy diagram of the optical cable. In step S10, the optical cable vibration signal data includes the vibration signal intensity at each location point of the optical cable and the corresponding vibration occurrence time. The vibration signal time domain energy diagram is a two-dimensional diagram. The abscissa of the vibration signal time domain energy diagram is the length of the optical cable skin. And the ordinate of the vibration signal time domain energy diagram is vibration time.
And S20, selecting a plurality of optical cable positioning characteristic points according to the vibration signal time domain energy diagram. In step S20, the geographic position corresponding to each optical cable positioning feature point is a road intersection. The step of selecting the optical cable positioning feature points may be to determine whether slopes of vibration source tracks at two ends of the point to be detected in the vibration signal time domain energy diagram are opposite in polarity. And when the positive and negative slopes of the vibration source tracks at the two ends of the point to be detected are opposite, the point to be detected is the optical cable positioning characteristic point. And when the positive and negative slopes of the vibration source tracks at the two ends of the point to be detected are the same, reselecting the point to be detected, and judging whether the point to be detected reselected is the optical cable positioning characteristic point or not until the optical cable positioning characteristic points are all determined.
And S30, providing the optical cable route laying diagram and the optical cable laying area map, and determining the laying geographic position of each optical cable positioning feature point according to the optical cable route laying diagram and the optical cable laying area map. In step S30, the area where the optical cable to be tested is laid and the direction of the optical cable to be tested are obtained according to the optical cable route laying diagram. And obtaining the distance between the turning direction of each street in the optical cable laying area to be tested and each laying point according to the optical cable laying area map.
And S40, generating a corresponding relation table of the optical cable skin length and the geographic position according to the relation between each optical cable positioning characteristic point and the geographic position laid by each optical cable positioning characteristic point, and determining the geographic position corresponding to the optical cable skin length according to the corresponding relation table of the optical cable skin length and the geographic position. In step S40, the table of correspondence between the fiber skin length and the geographic position includes the fiber skin length of each optical cable positioning point and the geographic position corresponding to the optical cable positioning point.
In the embodiment, the method for positioning the length of the optical cable skin obtains the vibration energy time domain diagram of the length of the optical cable skin by utilizing the characteristic that the urban underground optical cables are generally laid on two sides of a road and the nearby optical cables vibrate when vehicles pass by. And selecting optical cable positioning characteristic points by analyzing the vibration energy time domain diagram. And determining the geographical position of laying each optical cable positioning feature point according to the optical cable routing laying map and the optical cable laying area map. Thereby generating a corresponding relation table of the cable skin length and the geographic position reflecting the relation between the cable skin length and the geographic position. And determining the geographical position corresponding to the optical cable skin length according to the corresponding relation table of the optical cable skin length and the geographical position. According to the method for positioning the optical cable skin length, the problem that the corresponding relation between the optical cable skin length and the geographic position is not clear can be solved. The optical cable skin length positioning method provides data reference for line first-aid repair when an optical cable fails.
In one embodiment, the step of acquiring the optical cable vibration signal data includes:
a pulsed light signal generator 10 and a shock signal demodulator 20 are provided. And the starting ends of the optical cables are respectively connected to the signal output end of the pulse light signal generator 10 and the signal input end of the vibration signal demodulator 20. Using the optical fiber in the optical cable as a sensor, the vibration of the optical cable caused by ground vibration is sensed by the optical fiber. When the pulsed light emitted from the pulsed light signal generator 10 propagates through the optical fiber, backward rayleigh scattered light is continuously generated. The backward rayleigh scattering light carrying the vibration information sensed by the optical fiber is received by the vibration signal demodulator 20, and the optical cable vibration signal data is acquired after the demodulation by the vibration signal demodulator 20.
The wavelength of the pulsed light may be 1550nm of pulsed light signal. In the process that the pulse light is positively propagated in the optical fiber of the optical cable, backward Rayleigh scattering light can be continuously generated due to the non-uniformity of the refractive index of the fiber core of the optical fiber. The Rayleigh backward scattering light generated at different positions of the optical fiber is modulated by an external vibration signal at the position, and the phase signal carries the information of the external vibration signal. The distance between the disturbance point and the outlet of the optical fiber of the equipment can be calculated through the time difference between the emission time of the optical pulse and the received Rayleigh backward scattering light, so that the vibration conditions of different positions along the optical fiber can be obtained through analyzing backward Rayleigh scattering signals.
In this embodiment, the characteristic of backward rayleigh scattering light can be continuously generated by using the non-uniformity of the refractive index of the fiber core, and the optical cable vibration signal data can be acquired by the pulsed optical signal generator 10 and the vibration signal demodulator 20.
In one embodiment, the step of acquiring the data of the vibration signal of the optical cable to obtain the time-domain energy map of the vibration signal of the optical cable at S10 includes:
and judging whether the vibration signal intensity of each point on the optical cable at each moment in the optical cable vibration signal data is greater than a vibration signal threshold value. If the intensity of the vibration signal is larger than the threshold value of the vibration signal, recording the time corresponding to the intensity of the vibration signal and the length of the optical cable skin, wherein the time corresponding to the intensity of the vibration signal and the length of the optical cable skin are a data point. And acquiring all data points, and generating a vibration signal time-domain energy diagram of the optical cable through the data points. The vibration signal threshold value can be set according to actual needs.
In this embodiment, the optical cable skin length positioning method processes the optical cable vibration signal data, so as to obtain the optical cable skin length corresponding to the signal with higher vibration intensity and the vibration occurrence time.
In one embodiment, the S30, providing the cable routing map and the cable routing area map, and the step of determining the geographic location of each cable positioning feature point according to the cable routing map and the cable routing area map includes:
and determining the area and the trend of the optical cable laying according to the optical cable routing laying diagram. And providing the optical cable laying area map according to the optical cable laying area. And determining the geographical position range corresponding to each optical cable positioning feature point according to the optical cable laying trend and the optical cable laying area map. For example, a cable location point with a cable sheath length of 300 meters may be located at a location about 300 meters from the cable start. And determining a road intersection in the geographical position range according to the geographical position range corresponding to each optical cable positioning feature point and according to the optical cable laying area map, wherein the road intersection is the geographical position where the optical cable positioning feature points are laid. Referring to fig. 2 and 3, the geographic location corresponding to the turning point between L1 and L2 is the intersection between road 1 and road 2 in fig. 3.
In this embodiment, the optical cable skin length positioning method may determine the geographic position range corresponding to each optical cable positioning feature point by analyzing the optical cable route laying map and the optical cable laying area map.
In one embodiment, the step of generating the table of correspondence between the fiber cable skin length and the geographic location further includes:
and selecting a first optical cable positioning characteristic point and a second optical cable positioning characteristic point. And acquiring a first geographical position corresponding to the first optical cable positioning feature point and a second geographical position corresponding to the second optical cable positioning feature point according to the optical cable routing and laying map and the optical cable laying area map. And obtaining a first difference value according to the first optical cable positioning characteristic point and the second optical cable positioning characteristic point. And obtaining a second difference value according to the first geographical position and the second geographical position. And obtaining a first scale coefficient according to the ratio of the first difference to the second difference.
Selecting a third geographic location between the first geographic location and the second geographic location. And calculating the distance between the third geographic position and the first geographic position to obtain a third difference value. And obtaining the cable skin length difference between the third geographic position and the first geographic position according to the product of the third difference and the first proportional coefficient. And the cable skin length corresponding to the third geographic position is the sum of the cable skin length corresponding to the first optical cable positioning characteristic point and the cable skin length difference. And generating a corresponding relation table of the optical cable skin length and the geographic position according to the relation between each optical cable positioning characteristic point and the geographic position laid by each optical cable positioning characteristic point and the relation between the optical cable skin length corresponding to the third geographic position and the third geographic position.
It is understood that, in an alternative embodiment, the step of obtaining the first scale factor may be obtaining a first difference value by subtracting the cable sheath length corresponding to the first cable positioning feature point from the cable sheath length corresponding to the second cable positioning feature point. And calculating the distance between the first geographical position and the second geographical position to obtain a second difference value. And obtaining a first scale coefficient according to the ratio of the first difference to the second difference.
In this embodiment, the optical cable skin length positioning method obtains the relationship between more optical cable positioning points and the corresponding geographic positions thereof by a difference method, and thus can more accurately solve the problem that the correspondence between the optical cable skin length and the geographic positions is ambiguous. The optical cable skin length positioning method provides data reference for line first-aid repair when an optical cable fails.
Referring to fig. 4, an embodiment of the present application provides an optical fiber vibration monitoring system 100. The optical fiber vibration monitoring system 100 includes a pulsed optical signal generator 10, a vibration signal demodulator 20, and a processor 40.
The pulse light signal generator 10 is used for providing pulse light signals to the optical cable. When detecting the optical cable vibration signal, the starting end of the optical cable is respectively connected to the signal output end of the pulsed light signal generator 10 and the signal input end of the vibration signal demodulator 20. When the pulse light emitted by the pulse light signal generator propagates in the optical fiber, backward Rayleigh scattering light is continuously generated. The backward rayleigh scattering light carrying the vibration information sensed by the optical fiber is received by the vibration signal demodulator 20, and the vibration signal data of the optical cable is obtained after the demodulation by the vibration signal demodulator 20. The processor 40 is electrically connected to the vibration signal demodulator 20. The processor 40 is configured to implement the steps of acquiring data of the vibration signal of the optical cable to obtain a time-domain energy map of the vibration signal of the optical cable according to any one of the above embodiments.
The processor 40 has a judging module and a storing module. The storage module may store the shock signal threshold. The judging module judges whether the vibration signal intensity of each point on the optical cable at each moment in the optical cable vibration signal data is greater than a vibration signal threshold value. If the intensity of the vibration signal is larger than the threshold value of the vibration signal, recording the time corresponding to the intensity of the vibration signal and the length of the optical cable skin, wherein the time corresponding to the intensity of the vibration signal and the length of the optical cable skin are a data point. The processor 40 acquires all data points and generates a vibration signal time-domain energy map of the optical cable through the data points. The vibration signal threshold value can be set according to actual needs. The optical fiber cable skin length positioning method can be realized by the optical fiber vibration monitoring system 100.
Referring to fig. 5, in one embodiment, the fiber vibration monitoring system 100 further includes a circulator 30.
The circulator 30 has a first end 31, a second end 32, and a third end 33. The first end 31 is connected to the pulsed light signal generator 10. The third terminal 33 is connected to the vibration signal demodulator 20. The pulsed optical signal generator 10 includes a laser light generating element 11, a modulating element 12, a pulse generating element 13, a driving element 14, and an erbium-doped fiber amplifying element 15. The laser light generating element 11, the modulation element 12, and the erbium-doped fiber amplifier element 15 are electrically connected in this order. The driving element 14 is electrically connected between the pulse generating element 13 and the modulation element 12. The vibration signal demodulator 20 includes a detecting element 21 and an acquiring element 22. The detector element 21 is electrically connected to the third terminal 33. The acquisition element 22 is electrically connected to the processor 40.
When the cable shock signal is detected, the second end 32 is electrically connected to the cable start end. The laser generating element 11 can generate strong coherent continuous light at 1550 nm. The pulse generating element 13 generates a pulse control signal. The pulse control signal controls the modulation element 12 via the drive element 14. The continuous light is modulated by the modulation element 12 to form a pulsed light signal. The modulating element 12 may be an acousto-optic modulator (AOM). The pulse light signal modulated by the modulation element 12 passes through the erbium-doped fiber amplification element 15 to obtain a pulse light with amplified peak power. The pulsed light is then injected into the optical fiber in the fiber optic cable through the second end 32 of the circulator 30. Backward rayleigh scattered light is continuously generated while propagating in the optical fiber. The backward rayleigh scattering light carrying the vibration information sensed by the optical fiber finally enters the photoelectric detection element 21 again through the circulator 30, and the optical cable vibration signal data is collected through the collection element 22. The processor 40 acquires all data points and generates a vibration signal time-domain energy map of the optical cable through the data points.
In this embodiment, the pulse generating element 13 and the driving element 14 are matched to control the modulating element 12 to modulate the coherent continuous light into a pulsed light signal. The backward rayleigh scattering light can be generated without interruption while the pulsed optical signal propagates in the optical fiber. The backward rayleigh scattered light carrying vibration information sensed by the optical fiber may be finally received by the processor 40 to implement the cable skin length positioning method.
There is also provided in an embodiment of the present application a computer readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method for cable skin length location.
It will be understood by those skilled in the art that all or part of the processes of the method for positioning a fiber optic cable skin length according to the embodiments described above can be implemented by a computer program, which can be stored in a non-volatile computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the computer program is executed. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within 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 application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. A method for positioning a fiber optic cable skin length, comprising:
s10, acquiring optical cable vibration signal data to obtain a vibration signal time domain energy diagram of the optical cable;
s20, selecting a plurality of optical cable positioning characteristic points according to the vibration signal time domain energy diagram;
s30, providing an optical cable route laying diagram and an optical cable laying area map, and determining the laying geographic position of each optical cable positioning feature point according to the optical cable route laying diagram and the optical cable laying area map;
s40, generating a corresponding relation table of the optical cable skin length and the geographic position according to the relation between each optical cable positioning feature point and the geographic position laid by each optical cable positioning feature point, and determining the geographic position corresponding to the optical cable skin length according to the corresponding relation table of the optical cable skin length and the geographic position;
the geographical position corresponding to the optical cable positioning feature point is a road intersection, and the step of selecting the optical cable positioning feature point comprises the following steps:
judging whether the slopes of the vibration source tracks at the two ends of the point to be detected in the vibration signal time domain energy diagram are opposite or not;
and when the positive and negative slopes of the vibration source tracks at the two ends of the point to be detected are opposite, the point to be detected is the optical cable positioning characteristic point.
2. The method of claim 1, wherein the step of obtaining cable seismic signal data comprises:
providing a pulse light signal generator (10) and a vibration signal demodulator (20), and respectively connecting the starting end of the optical cable to the signal output end of the pulse light signal generator (10) and the signal input end of the vibration signal demodulator (20);
using the optical fiber in the optical cable as a sensor, the vibration of the optical cable caused by ground vibration is sensed by the optical fiber;
as the pulse light emitted by the pulse light signal generator (10) is propagated in the optical fiber, backward Rayleigh scattering light is continuously generated, carries vibration information sensed by the optical fiber and is received by the vibration signal demodulator (20), and the vibration signal data of the optical cable is acquired after the vibration signal demodulator (20) demodulates the backward Rayleigh scattering light.
3. The method for locating the sheath length of the optical cable according to claim 2, wherein the step of obtaining the data of the vibration signal of the optical cable to obtain the time-domain energy map of the vibration signal of the optical cable at S10 includes:
judging whether the vibration signal intensity of each point on the optical cable at each moment in the optical cable vibration signal data is greater than a vibration signal threshold value;
if the intensity of the vibration signal is greater than the vibration signal threshold value, recording the time corresponding to the intensity of the vibration signal and the length of the optical cable skin, wherein the time corresponding to the intensity of the vibration signal and the length of the optical cable skin are a data point;
and acquiring all data points, and generating a vibration signal time-domain energy diagram of the optical cable through the data points.
4. The optical cable skin length positioning method according to claim 1, wherein when the slope positivity and negativity of the vibration source trajectories at both ends of the point to be detected are the same, the point to be detected is reselected, and it is determined whether the point to be detected reselected is the optical cable positioning feature point until all the optical cable positioning feature points are determined.
5. The cable skin length positioning method according to claim 1, wherein the step of S30 providing a cable routing and cabling area map, and the step of determining the geographical location of each cable positioning feature point according to the cable routing and cabling area map comprises:
determining the area and the trend of the optical cable laying according to the optical cable routing laying diagram;
providing an optical cable laying area map according to the optical cable laying area;
and determining the geographical position range corresponding to each optical cable positioning feature point according to the optical cable laying trend and the optical cable laying area map.
6. The cable skin length positioning method according to claim 5, wherein the step of S30 providing a cable routing and cabling area map, and the step of determining the geographical location of each cable positioning feature point according to the cable routing and cabling area map comprises:
and determining a road intersection in the geographical position range according to the geographical position range corresponding to each optical cable positioning feature point and according to the optical cable laying area map, wherein the road intersection is the geographical position where the optical cable positioning feature points are laid.
7. The method according to claim 1, wherein the step of generating the table of correspondence between the sheath length and the geographical location further comprises:
selecting a first optical cable positioning characteristic point and a second optical cable positioning characteristic point;
acquiring a first geographical position corresponding to the first optical cable positioning feature point and a second geographical position corresponding to the second optical cable positioning feature point according to the optical cable routing and laying map and the optical cable laying area map;
obtaining a first difference value according to the first optical cable positioning characteristic point and the second optical cable positioning characteristic point, and obtaining a second difference value according to the first geographic position and the second geographic position;
obtaining a first proportional coefficient according to the ratio of the first difference to the second difference;
selecting a third geographic location between said first geographic location and said second geographic location;
calculating the distance between the third geographical position and the first geographical position to obtain a third difference value;
obtaining a cable skin length difference between the third geographical position and the first geographical position according to the product of the third difference and the first scale coefficient;
the cable skin length corresponding to the third geographic position is the sum of the cable skin length corresponding to the first optical cable positioning feature point and the cable skin length difference;
and generating a corresponding relation table of the optical cable skin length and the geographic position according to the relation between each optical cable positioning characteristic point and the geographic position laid by each optical cable positioning characteristic point and the relation between the optical cable skin length corresponding to the third geographic position and the third geographic position.
8. The method of claim 7, wherein the step of obtaining a first scaling factor further comprises:
the cable skin length corresponding to the first optical cable positioning characteristic point is differenced with the cable skin length corresponding to the second optical cable positioning characteristic point to obtain a first difference value;
calculating the distance between the first geographical position and the second geographical position to obtain a second difference value;
and obtaining a first scale coefficient according to the ratio of the first difference to the second difference.
9. A fiber optic vibration monitoring system (100), comprising:
a pulsed light signal generator (10) that supplies a pulsed light signal to the optical cable;
the vibration signal demodulator (20) is used for respectively connecting the starting end of the optical cable to the signal output end of the pulse light signal generator and the signal input end of the vibration signal demodulator when detecting the optical cable vibration signal, when the pulse light emitted by the pulse light signal generator (10) is propagated in the optical fiber, backward Rayleigh scattering light is continuously generated, the backward Rayleigh scattering light carries vibration information sensed by the optical fiber and is received by the vibration signal demodulator (20), and optical cable vibration signal data are obtained after the vibration signal demodulator (20) demodulates the backward Rayleigh scattering light; and
a processor (50) electrically connected to the vibration signal demodulator (20) for implementing the steps of acquiring the optical cable vibration signal data according to any one of claims 1 to 8 to obtain the vibration signal time-domain energy map of the optical cable.
10. The fiber optic vibration monitoring system (100) of claim 9, further comprising:
a circulator (30) having a first end (31) and a third end (33);
the first end (31) is connected with the pulse optical signal generator (10), and the third end (33) is connected with the vibration signal demodulator (20).
11. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method of any of claims 1 to 8 are implemented when the computer program is executed by the processor.
12. 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 according to any one of claims 1 to 8.
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| CN111010229B (en) * | 2019-12-11 | 2023-04-07 | 国网山东省电力公司日照供电公司 | Optical cable fault positioning system and method based on GIS platform |
| CN114759978A (en) * | 2022-04-20 | 2022-07-15 | 中国电信股份有限公司 | Optical cable maintenance method, device and system |
| CN115913349B (en) * | 2022-12-05 | 2023-09-01 | 国网山东省电力公司平邑县供电公司 | Optical cable equipment abnormality positioning method and device, storage medium and terminal |
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