CN113691309B - Method, system, equipment and medium for measuring half wavelength of standing wave of OPGW (optical fiber composite overhead ground wire) optical cable - Google Patents
Method, system, equipment and medium for measuring half wavelength of standing wave of OPGW (optical fiber composite overhead ground wire) optical cable Download PDFInfo
- Publication number
- CN113691309B CN113691309B CN202110950290.6A CN202110950290A CN113691309B CN 113691309 B CN113691309 B CN 113691309B CN 202110950290 A CN202110950290 A CN 202110950290A CN 113691309 B CN113691309 B CN 113691309B
- Authority
- CN
- China
- Prior art keywords
- phase
- reflection point
- grating reflection
- radian difference
- points
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
- H04B10/0771—Fault location on the transmission path
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H13/00—Measuring resonant frequency
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07957—Monitoring or measuring wavelength
Abstract
The invention discloses a method, a system, equipment and a medium for measuring the half wavelength of a standing wave of an OPGW (optical fiber composite overhead ground wire) optical cable, belonging to the technical field of transmission line safety control; the method comprises the following steps: acquiring phase radians of a plurality of sampling time points of each grating reflection point based on a grating array in a sensing optical fiber of the OPGW optical cable to be detected; acquiring phase radian difference of adjacent sampling time points of each grating reflection point based on the phase radians of the plurality of sampling time points of each grating reflection point; acquiring two phase radian difference minimum value points meeting preset requirements based on the phase radian difference of adjacent sampling time points of each grating reflection point; and obtaining the distance between two grating reflection points corresponding to the two phase radian difference minimum value points, and finishing the measurement of the half wavelength of the standing wave. The invention can realize the measurement of the half wavelength of the standing wave in the aeolian vibration of the OPGW optical cable and can solve the technical problem of incomplete measurement of the aeolian vibration standing wave parameter of the OPGW optical cable.
Description
Technical Field
The invention belongs to the technical field of transmission line safety control, and particularly relates to a method, a system, equipment and a medium for measuring a half-wavelength standing wave of an OPGW (optical fiber composite overhead ground wire) optical cable.
Background
An Optical Fiber Composite Overhead Ground Wire (OPGW) Optical cable erected between two towers conforms to a string vibration model, breeze vibration is easily generated to form standing waves, and the vibration of the OPGW Optical cable can cause severe accidents such as fatigue strand breakage, wire breakage, hardware damage, tower collapse and the like of the OPGW, so that great economic loss is caused.
The details are further elaborated as follows:
(1) The optical fiber is placed in the ground wire of an overhead high-voltage transmission line to form an optical fiber communication network on the transmission line, and the structural form has the double functions of the ground wire and communication and is generally called an OPGW optical cable.
(2) When wind blows across the OPGW cable, a steady shedding karman vortex is formed behind it, typically at a velocity of 0.5 to 10m/s, hence the term "breeze vibration". The main harm of the aeolian vibration of the OPGW optical cable can cause the fatigue strand breaking of the OPGW, and the serious strand breaking can cause the wire breaking accident and threaten the service life of the overhead transmission line.
(3) The standing wave is a special interference phenomenon formed by superposition of two lines of coherent waves with the same amplitude, frequency and propagation speed when the coherent waves propagate on the same straight line in opposite directions. When stable standing waves are formed, stable vibration amplitude maximum values and minimum values, which are called antinodes and nodes, can appear; the distance between adjacent antinodes and nodes is called the half wavelength of the standing wave.
(4) The string vibration model refers to that elastic strings are fixed at two ends, when the strings vibrate under the influence of external factors, stable standing waves can be formed, and the two ends are fixed wave nodes.
In order to avoid the above situation, real-time monitoring needs to be performed on the OPGW optical cable. The traditional monitoring mode is a single-point mode, and the defects of the traditional monitoring mode comprise:
(1) Monitoring points are generally only arranged at a pole tower, communication equipment such as a power supply and a wireless network is needed for installing the sensor, the sensor is easily influenced by electromagnetic interference, corrosion and the like, and the stability of the sensor is difficult to maintain under outdoor severe conditions;
(2) The single-point measurement can only monitor the state of the optical cable at the tower joint and cannot monitor the whole optical cable;
(3) The sensors are complex to install and need to be installed after the cable is erected on site.
In view of the above-mentioned defects of single-point monitoring, in recent years, a distributed optical fiber sensing system based on Dense Wavelength Division Multiplexing (DWDM) technology has been gradually applied in the field of monitoring the operating state of an OPGW optical cable due to its characteristics of large capacity, high precision, flexible design, electromagnetic interference resistance, corrosion resistance, and the like. When the distributed sensing optical fiber is utilized, the sensor is already installed when the sensor is erected outdoors, the sensor and the optical cable are manufactured in a cable, and the running state of the OPGW optical cable can be monitored in real time by compounding the distributed sensing optical fiber unit in the OPGW optical cable; through the string vibration model, when standing waves are formed, the tension value between the string wires can be obtained as long as the vibration frequency and the half wavelength of the standing waves are measured, and the running state of the OPGW optical cable is monitored.
In summary, the OPGW optical cable is in a string vibration mode under the condition of breeze vibration, and the standing wave generated in the mode is a main factor influencing the fatigue strand breaking of the OPGW optical cable. Parameters describing standing waves comprise vibration frequency and half wavelength, the existing distributed optical fiber sensing system can only monitor the vibration frequency of an OPGW optical cable, no measurement means of the half wavelength of the vibration standing waves exists, and a new method and a system for measuring the half wavelength of the aeolian vibration of the optical fiber composite overhead ground wire are urgently needed.
Disclosure of Invention
The invention aims to provide a method, a system, equipment and a medium for measuring a half-wavelength standing wave of an OPGW (optical fiber composite overhead ground wire) optical cable, so as to solve one or more technical problems. The invention can realize the measurement of the half wavelength of the standing wave in the aeolian vibration of the OPGW optical cable and can solve the technical problem of incomplete measurement of the aeolian vibration standing wave parameter of the OPGW optical cable.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for measuring the half wavelength of a standing wave of an OPGW optical cable, which comprises the following steps:
acquiring phase radians of a plurality of sampling time points of each grating reflection point based on a distributed grating array in a sensing optical fiber of the OPGW optical cable to be detected;
acquiring phase radian difference of adjacent sampling time points of each grating reflection point based on the phase radians of the plurality of sampling time points of each grating reflection point;
acquiring two phase radian difference minimum value points meeting preset requirements based on the phase radian difference of adjacent sampling time points of each grating reflection point;
and obtaining the distance between two grating reflection points corresponding to the two phase radian difference minimum value points, and finishing the measurement of the half wavelength of the standing wave.
The method of the present invention is further improved in that, in the process of obtaining the phase radians of the plurality of sampling time points of each grating reflection point, the expression of the phase radians is as follows:
wherein A is the phase radian of the grating reflection point, i is the ith grating reflection point, k is the kth sampling time point,
a signal generated for low frequency noise.
The method of the present invention is further improved in that, in the process of obtaining the phase radian difference of adjacent sampling time points of each grating reflection point, the expression of the phase radian difference is as follows:
in the formula (I), the compound is shown in the specification,
the phase radian difference from the kth sampling time point to the (k + 1) th sampling time point is taken as the ith grating reflection point.
The method of the present invention is further improved in that, in the process of obtaining the phase radian difference of the adjacent sampling time points of each grating reflection point, after obtaining the phase radian difference of the adjacent sampling time points of each grating reflection point, the method further comprises: and respectively amplifying the phase radian difference obtained by each grating reflection point, and taking the amplified result as the phase radian difference of the grating reflection point.
The method of the present invention is further improved in that the step of amplifying the phase radian difference obtained by each grating reflection point respectively and taking the amplified result as the phase radian difference of the grating reflection point specifically comprises:
and accumulating the continuous preset number of phase radian differences of each grating reflection point, and taking the accumulated result as the phase radian difference of the grating reflection point.
The method of the present invention is further improved in that after the step of taking the accumulated result as the phase radian difference of the reflection point of the corresponding grating, the method further comprises the following steps:
and respectively carrying out averaging processing based on the accumulation result of each grating reflection point, and taking the averaging processing result as the final phase radian difference of the grating reflection points.
The method of the present invention is further improved in that the step of obtaining two phase radian difference minimum values meeting the preset requirement specifically includes:
acquiring two adjacent and close phase radian difference minimum value points; the adjacent means that no phase radian difference minimum value point exists between the two phase radian difference minimum value points, and the approach means that the difference value of the two phase radian difference minimum value points meets the requirement of a preset threshold value.
The invention provides a standing wave half-wavelength measurement system of an OPGW optical cable in a second aspect, comprising:
the phase radian acquisition module is used for acquiring the phase radians of a plurality of sampling time points of each grating reflection point based on a distributed grating array in a sensing optical fiber of the OPGW optical cable to be detected;
the phase radian difference acquisition module is used for acquiring the phase radian difference of adjacent sampling time points of each grating reflection point based on the phase radians of the plurality of sampling time points of each grating reflection point;
the minimum value point acquisition module is used for acquiring two phase radian difference minimum value points meeting the preset requirement based on the phase radian difference of adjacent sampling time points of each grating reflection point;
and the standing wave half-wavelength acquisition module is used for acquiring the distance between two grating reflection points corresponding to the two phase radian difference minimum value points to complete the measurement of the standing wave half-wavelength.
A third aspect of the present invention provides a computer device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the steps of the method for measuring a half wavelength of a standing wave of an OPGW optical cable according to any one of the above aspects of the present invention.
A fourth aspect of the present invention provides a computer readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the steps of the method for measuring half wavelength standing wave of an OPGW optical cable as described above in any one of the above aspects of the present invention.
Compared with the prior art, the invention has the following beneficial effects:
in view of the fact that parameters describing standing waves comprise vibration frequency and half wavelength, the distributed optical fiber sensing system can only monitor the vibration frequency of the OPGW optical cable at present, and has no measurement means for measuring the half wavelength of the vibration standing waves. The invention adopts a measuring method of a distributed grating array, and two minimum points of phase radian difference (which are explained and respectively regarded as nodes and troughs of standing wave waveforms) meeting the preset requirement are obtained by obtaining the phase radian difference of adjacent sampling time points of each grating reflection point in the distributed grating array, so that the measurement of the half wavelength of the standing wave in the aeolian vibration of the OPGW optical cable is realized, the problem of incomplete measurement of the aeolian vibration standing wave parameters of the OPGW optical cable is solved, and the method is an important component part for analyzing the fatigue broken strand of the OPGW optical cable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic flow chart of a method for measuring a half wavelength of a standing wave in a fiber composite overhead ground wire breeze vibration according to embodiment 1 of the present invention;
fig. 2 is a schematic flow chart of a method for measuring a half-wavelength of a breeze vibration of an optical fiber composite overhead ground wire according to embodiment 2 of the present invention;
fig. 3 is a schematic diagram of a system for measuring the half wavelength of the standing wave in the micro-wind vibration of the optical fiber composite overhead ground wire according to embodiment 3 of the present invention;
fig. 4 is a schematic diagram of the overall design scheme of a high-performance acoustic wave sensing system using a distributed optical fiber in embodiment 4 of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above 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 invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
example 1
Referring to fig. 1, a method for measuring a half-wavelength of a breeze vibration of an optical fiber composite overhead ground wire according to an embodiment of the present invention includes the following steps:
step 1, acquiring phase radians of a plurality of sampling time points of each grating reflection point based on a grating array in a sensing optical fiber of an OPGW optical cable to be detected.
Illustratively, the OPGW optical cable includes a plurality of communication fibers, and a grating array is engraved on selected communication fibers to form sensing fibers. Illustratively, the intervals of the reflection points of each grating in the grating array are the same, and the sampling time intervals of a plurality of sampling time points are the same.
And 2, acquiring the phase radian difference of adjacent sampling time points of each grating reflection point based on the phase radians of the plurality of sampling time points of each grating reflection point.
Illustratively, after obtaining the phase radian difference of adjacent sampling time points of each grating reflection point, the method further comprises: and respectively amplifying the phase radian difference obtained by each grating reflection point, and taking the amplified result as the phase radian difference of the grating reflection point. Specifically, the step of amplifying the phase radian difference obtained by each grating reflection point respectively and taking the amplified result as the phase radian difference of the grating reflection point specifically includes: and accumulating the continuous preset number of phase radian differences of each grating reflection point, and taking the accumulated result as the phase radian difference of the grating reflection point. More specifically, after the adding result is used as the phase radian difference of the reflection point of the corresponding grating, the method further includes: and respectively carrying out averaging processing based on the accumulation result of each grating reflection point, and taking the averaging processing result as the final phase radian difference of the grating reflection points.
And 3, acquiring two phase radian difference minimum value points meeting the preset requirement based on the phase radian difference of adjacent sampling time points of each grating reflection point.
Illustratively, the step of acquiring two phase radian difference minimum value points which meet the preset requirement specifically includes: acquiring two adjacent and close phase radian difference minimum value points; the adjacent means that no phase radian difference minimum value point exists between the two phase radian difference minimum value points, and the approach means that the difference value of the two phase radian difference minimum value points meets the requirement of a preset threshold value.
And 4, obtaining the distance between two grating reflection points corresponding to the two phase radian difference minimum value points, and completing the measurement of the half wavelength of the standing wave.
The principle analysis of the technical scheme of the embodiment 1 of the invention comprises the following steps: based on the distributed optical fiber sensing technology, the method of the invention utilizes the dense characteristic of the distributed optical fiber sensor, the vibration phase of the optical cable can be sensed by the optical fibers along the OPGW optical cable, the distributed optical fiber sensing system is utilized to demodulate and obtain the phase information of each reflection point (preferably, after differential accumulation and amplification), then the quantity which symbolizes the vibration phase change degree of the reflection point is obtained, the value is transversely compared in the reflection point, two adjacent and close minimum value points are searched, the positions of the two points can be considered to be near the nodes of two adjacent standing waves, and the distance between the two points is considered to be the half wavelength of the standing wave.
In the method of embodiment 1 of the present invention, a measurement method of a distributed grating array is adopted to obtain two phase radian difference minimum values that satisfy preset requirements (illustratively, the two phase radian difference minimum values are respectively regarded as nodes and troughs of a standing wave waveform), so as to implement measurement of half-wavelength of the standing wave in the aeolian vibration of the OPGW optical cable, and solve the problem of incomplete measurement of the parameter of the standing wave in the aeolian vibration of the OPGW optical cable.
Example 2
Referring to fig. 2, a method for measuring a half-wavelength of a breeze vibration of an optical fiber composite overhead ground wire according to an embodiment of the present invention includes the following steps:
receiving signal data acquired by a data acquisition card: the phase radian of each reflection point is demodulated in real time by using a distributed optical fiber high-performance sound wave sensing system, wherein the signal acquired by the ith reflection point and the kth sampling time point is as follows:
in the formula:
for the signal generated by the low-frequency noise, a is the phase radian of each reflection point, i is the ith reflection point, and k is the kth sampling time point.
By acquiring signals of a certain time, a two-dimensional matrix of space and time can be obtained:
in the formula: n represents the number of reflection points, and e represents the number of sampling points. The phase radians Ai, k of all the collected reflection points at all times form a two-dimensional matrix An, e of the phase radians.
The matrix of formula (2) represents different reflection points laterally and the same reflection point at different sampling time points longitudinally. I.e. a discrete time domain signal whose longitudinal direction represents the phase arc of the reflection point over time.
Taking absolute values of difference: the difference of the signals collected at adjacent moments of the same reflection point can be obtained:
in the formula: delta A i,k And
the phase radian difference of two adjacent moments of the same point is obtained.
Obtained as
The phase radian variation of the ith reflection point from the k moment to the k +1 moment, because the phase reaches the maximum value in the fluctuationA time instant decreases so the magnitude of the change may have a negative value. So to describe the magnitude of the degree of change in phase radian
Taking the absolute value
Accumulation of 100 consecutive values: to avoid reflection points at different positions of the standing wave due to too small sampling intervals
The value comparison is not obvious, m of single reflection points are continuous (100 are selected in the embodiment)
The values are accumulated to obtain:
namely, the phase radian change value of the reflection point is amplified through accumulation, so that the contrast is more obvious. N continuous m accumulated values are carried out on all the reflection points, and a two-dimensional matrix of space and time is obtained as well:
wherein, [ (e-1)/m ] represents the new residual number of the data with the total sampling number of e after differential accumulation processing, the [ ] symbol represents the integer of the value of (e-1)/m, and the residual m-1 differential absolute values are removed. The formula represents the accumulated value of the absolute value of m continuous differences of a single reflection point in the longitudinal direction, and represents different reflection points in the transverse direction.
Wherein, when m is 100:
the formula represents the accumulated value of the absolute value of the difference of 100 times continuously for a single reflection point in the vertical direction, and represents different reflection points in the horizontal direction.
Transverse comparison: the data collected are stable frequency and amplitude signals, so that each phi of the same reflection point i,k The values will all stabilize to float within a range, all phi of a single reflection point i,k The values are averaged and then compared laterally.
Grating pitch x grating sequence difference (with the same grating pitches) yields a standing wave half wavelength: two adjacent and close minimum value points are searched, the positions of the two points are considered to be near two adjacent standing wave nodes, and the distance between the two points is the half wavelength of the standing wave.
The harm of the breeze vibration to the OPGW optical cable is mainly to cause the tension change of the cable, and the tension change can be described by the state of vibration standing wave, and the parameters describing the standing wave comprise vibration frequency and half wavelength. The existing scattering type distributed optical fiber sensing technology mainly collects the vibration frequency of the OPGW optical cable breeze vibration, and a measuring method of the half wavelength of the standing wave is not described. The invention adopts a measuring method of a distributed grating array, and the nodes and the wave troughs of the standing wave are collected by the reflection cavity generated by the two gratings, so that the measurement of the half wavelength of the standing wave is realized. The invention adopts the measurement method of the distributed grating array, realizes the measurement of the half wavelength of the standing wave in the aeolian vibration of the OPGW optical cable, solves the problem of incomplete measurement of the parameter of the aeolian vibration standing wave of the OPGW optical cable, and is an important component part for the fatigue and strand breakage analysis of the OPGW optical cable.
Example 3
The following are embodiments of the apparatus of the present invention that may be used to perform embodiments of the method of the present invention. For details of non-careless mistakes in the embodiment of the apparatus, please refer to the embodiment of the method of the present invention.
Referring to fig. 3, a standing wave half-wavelength measurement system for an OPGW optical cable according to embodiment 3 of the present invention includes:
the phase radian acquisition module is used for acquiring phase radians of a plurality of sampling time points of each grating reflection point based on a grating array in a sensing optical fiber of the OPGW optical cable to be detected;
the phase radian difference acquisition module is used for acquiring the phase radian difference of adjacent sampling time points of each grating reflection point based on the phase radians of the plurality of sampling time points of each grating reflection point;
the minimum value point acquisition module is used for acquiring two phase radian difference minimum value points meeting the preset requirement based on the phase radian difference of adjacent sampling time points of each grating reflection point;
and the standing wave half-wavelength acquisition module is used for acquiring the distance between two grating reflection points corresponding to the two phase radian difference minimum value points to complete the measurement of the standing wave half-wavelength.
In the embodiment of the invention, the sensing optical fiber uses a grating array optical fiber sensing technology, and on the basis of the optical fiber grating sensing technology, a plurality of optical fiber gratings are cascaded and multiplexed to form a parallel multi-point sensing array or a sensing network, and information of each sensing measurement point is obtained through spectrum demodulation, so that the condition in the monitored whole area is comprehensively mastered and accurately positioned.
The system has the advantages that the sensor is simple to install, the optical fiber can be directly arranged only by being compounded in the OPGW optical cable, and the subsequent manual installation is not needed. The distributed optical fiber is used for measuring the half wavelength of the standing wave, is a new application in the field of optical fiber sensing, has the advantages of an optical fiber sensing system, is resistant to electromagnetic interference and strong in corrosion resistance, is suitable for working in severe environments, can improve the measurement precision, reduces the influence of human factors, and can achieve the effect of real-time monitoring under outdoor conditions.
Example 4
Referring to fig. 4, a system for measuring a half-wavelength of a aeolian vibration of an optical fiber composite overhead ground wire in embodiment 4 of the present invention includes:
modulating continuous light of a laser light source into pulse light through a pulse modulator and amplifying light power; the pulse light after the light power amplification enters the erbium-doped fiber amplifier, then the light signal is amplified again, the amplified light signal enters the distributed fiber through the circulator 1, the reflected light of the fibers at different positions is reflected back in different time, then enters the circulator 2 through the circulator 1 again, then enters the 3 x 3 coupler through the circulator 2, is divided into 3 paths of light with the phase difference of 120 degrees, and then passes through the long arm and the short arm of the Michelson interferometer.
The reflected light from the two adjacent optical fibers passes through the loop and then forms four beams, wherein the former reflected light passes through one beam of the short arm, the former reflected light passes through one beam of the long arm, the latter reflected light passes through one beam of the short arm, and the latter reflected light passes through one beam of the long arm. When the optical path difference of two arms of the interferometer is matched with the distance between two reflection points, reflected light of the two arms passes through one beam of the long arm and meets with reflected light of the latter at the coupler through one beam of the short arm to form interference light, the interference light and the reflected light are converted into electric signals by three photoelectric detectors, the electric signals are collected by a collection card and are uploaded to an upper computer, and phase information in the interference signals is resolved by a demodulation algorithm designed by the upper computer.
And (3) demodulating the phase radian of each reflection point in real time by using a distributed optical fiber high-performance acoustic wave sensing system, wherein the formula (1) is described above.
By collecting signals over a certain time, a two-dimensional matrix of space and time can be obtained, as in equation (2) above.
The difference between the signals collected at adjacent times of the same reflection point can be obtained as shown in the above formula (3).
Obtained is delta phi i,k The amount of change in phase radian of the ith reflection point from time k to time k +1 may have a negative value because the phase decreases at the next time after reaching the maximum value in the fluctuation. So to describe the magnitude of the degree of change in phase radian
Taking the absolute value
To avoid reflection points at different positions of the standing wave due to too small sampling intervals
The value is not obviously compared, and m continuous reflection points are formed
The values are accumulated as in equation (4) above.
Namely, the phase radian change value of the reflection point is amplified through accumulation, so that the contrast is more obvious. N consecutive m accumulated values are made for all reflection points, and a two-dimensional matrix of space and time is obtained as well, as in the above formula (5).
The data collected are stable frequency and amplitude signals, so that each phi of the same reflection point i,k The values will all stabilize to float within a range, all phi of a single reflection point i,k The values are averaged, then transverse comparison is carried out, two adjacent and close minimum value points are searched, the positions of the two points can be considered to be near two adjacent standing wave nodes, and the distance between the two points is the half wavelength of the standing wave.
Example 5
In yet another embodiment of the present invention, a computer device is provided that includes a processor and a memory for storing a computer program comprising program instructions, the processor for executing the program instructions stored by the computer storage medium. The Processor may be a Central Processing Unit (CPU), or may be other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable gate array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc., which is a computing core and a control core of the terminal, and is specifically adapted to load and execute one or more instructions in a computer storage medium to implement a corresponding method flow or a corresponding function; the processor provided by the embodiment of the invention can be used for operating the method for measuring the half wavelength of the standing wave of the OPGW optical cable.
Example 6
In yet another embodiment of the present invention, the present invention further provides a storage medium, specifically a computer-readable storage medium (Memory), which is a Memory device in a computer device and is used for storing programs and data. It is understood that the computer readable storage medium herein can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space storing an operating system of the terminal. Also, one or more instructions, which may be one or more computer programs (including program code), are stored in the memory space and are adapted to be loaded and executed by the processor. It should be noted that the computer-readable storage medium may be a high-speed RAM memory, or may be a non-volatile memory (non-volatile memory), such as at least one disk memory. One or more instructions stored in the computer-readable storage medium may be loaded and executed by the processor to implement the corresponding steps of the method for measuring a half wavelength of a standing wave on an OPGW optical cable in the above embodiments.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (9)
1. A method for measuring the half wavelength of a standing wave of an OPGW optical cable is characterized by comprising the following steps:
acquiring phase radians of a plurality of sampling time points of each grating reflection point based on a distributed grating array in a sensing optical fiber of the OPGW optical cable to be detected;
acquiring phase radian difference of adjacent sampling time points of each grating reflection point based on the phase radians of the plurality of sampling time points of each grating reflection point;
acquiring two minimum value points of phase radian difference meeting the preset requirement based on the phase radian difference of adjacent sampling time points of each grating reflection point;
obtaining the distance between two grating reflection points corresponding to the two phase radian difference minimum value points, and completing the measurement of the half wavelength of the standing wave;
the step of obtaining two phase radian difference minimum value points meeting the preset requirement specifically comprises the following steps:
acquiring two adjacent and close phase radian difference minimum value points; the adjacent means that no phase radian difference minimum value point exists between the two phase radian difference minimum value points, and the approach means that the difference value of the two phase radian difference minimum value points meets the requirement of a preset threshold value.
2. The method as claimed in claim 1, wherein in the step of obtaining the phase radians of the plurality of sampling time points of each grating reflection point, the expression of the phase radians is:
wherein A is the phase radian of the grating reflection point, i is the ith grating reflection point, k is the kth sampling time point,
a signal generated for low frequency noise.
3. The method as claimed in claim 2, wherein in the step of obtaining the phase radian difference between adjacent sampling time points of each grating reflection point, the expression of the phase radian difference is as follows:
in the formula (I), the compound is shown in the specification,
the phase radian difference from the kth sampling time point to the (k + 1) th sampling time point is taken as the ith grating reflection point.
4. The method as claimed in claim 1, wherein the step of obtaining the phase radian difference between adjacent sampling time points of each grating reflection point further comprises, after obtaining the phase radian difference between adjacent sampling time points of each grating reflection point:
and respectively amplifying the phase radian difference obtained by each grating reflection point, and taking the amplified result as the phase radian difference of the grating reflection point.
5. The method as claimed in claim 4, wherein the step of amplifying the phase radian difference obtained from each grating reflection point respectively, and taking the amplified result as the phase radian difference of the grating reflection point specifically comprises:
and accumulating the continuous preset number of phase radian differences of each grating reflection point, and taking the accumulated result as the phase radian difference of the grating reflection point.
6. The method as claimed in claim 5, wherein the step of taking the accumulated result as the phase radian difference of the reflection point of the corresponding grating further comprises:
and respectively carrying out averaging processing based on the accumulation result of each grating reflection point, and taking the averaging processing result as the final phase radian difference of the grating reflection points.
7. A standing wave half-wavelength measurement system of an OPGW optical cable is characterized by comprising:
the phase radian acquisition module is used for acquiring the phase radians of a plurality of sampling time points of each grating reflection point based on a distributed grating array in a sensing optical fiber of the OPGW optical cable to be detected;
the phase radian difference acquisition module is used for acquiring the phase radian difference of adjacent sampling time points of each grating reflection point based on the phase radians of the plurality of sampling time points of each grating reflection point;
the minimum value point acquisition module is used for acquiring two phase radian difference minimum value points meeting the preset requirement based on the phase radian difference of adjacent sampling time points of each grating reflection point;
the standing wave half-wavelength acquisition module is used for acquiring the distance between two grating reflection points corresponding to the two phase radian difference minimum value points and completing the measurement of the standing wave half-wavelength;
the step of obtaining two phase radian difference minimum value points meeting the preset requirement specifically comprises the following steps:
acquiring two adjacent and close phase radian difference minimum value points; the adjacent means that no phase radian difference minimum value point exists between the two phase radian difference minimum value points, and the approach means that the difference value of the two phase radian difference minimum value points meets the requirement of a preset threshold value.
8. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor when executing the computer program implements the steps of the standing wave half wavelength measurement method of the OPGW optical cable as claimed in any one of claims 1 to 6.
9. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the steps of the method for measuring half wavelength standing wave of an OPGW optical cable as claimed in any one of claims 1 to 6.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110950290.6A CN113691309B (en) | 2021-08-18 | 2021-08-18 | Method, system, equipment and medium for measuring half wavelength of standing wave of OPGW (optical fiber composite overhead ground wire) optical cable |
| PCT/CN2022/108350 WO2023020230A1 (en) | 2021-08-18 | 2022-07-27 | Standing wave half-wavelength determining method and apparatus in opgw optical cable, device, storage medium, and computer program product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110950290.6A CN113691309B (en) | 2021-08-18 | 2021-08-18 | Method, system, equipment and medium for measuring half wavelength of standing wave of OPGW (optical fiber composite overhead ground wire) optical cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113691309A CN113691309A (en) | 2021-11-23 |
| CN113691309B true CN113691309B (en) | 2022-10-11 |
Family
ID=78580499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110950290.6A Active CN113691309B (en) | 2021-08-18 | 2021-08-18 | Method, system, equipment and medium for measuring half wavelength of standing wave of OPGW (optical fiber composite overhead ground wire) optical cable |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113691309B (en) |
| WO (1) | WO2023020230A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113691309B (en) * | 2021-08-18 | 2022-10-11 | 中国电力科学研究院有限公司 | Method, system, equipment and medium for measuring half wavelength of standing wave of OPGW (optical fiber composite overhead ground wire) optical cable |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157101A (en) * | 2020-01-02 | 2020-05-15 | 武汉理工大学 | Weak grating array distributed vibration sensing system and method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101793570B (en) * | 2009-10-21 | 2012-08-08 | 南京大学 | Sensing method of optical-fiber Bragg grating laser device |
| CN106487461B (en) * | 2015-08-28 | 2019-02-26 | 大唐移动通信设备有限公司 | A kind of standing wave peak value determines method and apparatus |
| CN105157812A (en) * | 2015-09-18 | 2015-12-16 | 南京派光信息技术有限公司 | Digital enhanced interference-based high-sensitivity quasi-distributed fiber bragg grating vibration sensor |
| CN106066203B (en) * | 2016-05-25 | 2019-01-29 | 武汉理工大学 | The highly sensitive vibration-detection system of distribution and method based on ultrashort optical fiber optical grating array |
| CN106338308A (en) * | 2016-08-25 | 2017-01-18 | 武汉理工大学 | Distributed multi-parameter sensing system based on ultra-short fiber Bragg grating array |
| CN109342022B (en) * | 2018-09-11 | 2020-09-18 | 北京航天控制仪器研究所 | Tunable laser wavelength dynamic calibration device and method |
| CN110595604A (en) * | 2019-09-16 | 2019-12-20 | 武汉理工大学 | High-dynamic-range dual-wavelength distributed optical fiber vibration demodulation system and method |
| CN113691309B (en) * | 2021-08-18 | 2022-10-11 | 中国电力科学研究院有限公司 | Method, system, equipment and medium for measuring half wavelength of standing wave of OPGW (optical fiber composite overhead ground wire) optical cable |
-
2021
- 2021-08-18 CN CN202110950290.6A patent/CN113691309B/en active Active
-
2022
- 2022-07-27 WO PCT/CN2022/108350 patent/WO2023020230A1/en unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157101A (en) * | 2020-01-02 | 2020-05-15 | 武汉理工大学 | Weak grating array distributed vibration sensing system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113691309A (en) | 2021-11-23 |
| WO2023020230A1 (en) | 2023-02-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104089634B (en) | A kind of power transmission cable is waved and icing remote online monitoring system and monitoring method | |
| CN103323157B (en) | Dynamic monitoring method and device of stress sensitization fiber bragg grating of locking rods of railway turnout switch machine | |
| CN105222882B (en) | Transmission line of electricity aeolian vibration on-line monitoring system | |
| CN110686626B (en) | OPGW (optical fiber composite overhead ground wire) icing monitoring system and method based on phase-sensitive optical time domain reflection system | |
| CN106530544A (en) | Fiber grating array perimeter intrusion system | |
| CN107727227B (en) | Ultra-high-tension power transmission line icing based on Φ-OTDR waves monitoring method | |
| CN202139617U (en) | System for monitoring power transmission line pole tower foundation settlement based on single-point displacement | |
| CN103048588A (en) | Method and system for on-line locating power cable fault | |
| CN102564322B (en) | System for monitoring sag of overhead wire in real time | |
| CN102141434A (en) | Online monitoring system for power transmission line oscillation | |
| CN203163769U (en) | Overhead line safety monitoring system based on distributed fiber sensors | |
| CN105258780B (en) | Transmission line of electricity aeolian vibration on-line monitoring method | |
| CN113691309B (en) | Method, system, equipment and medium for measuring half wavelength of standing wave of OPGW (optical fiber composite overhead ground wire) optical cable | |
| CN103363914A (en) | Ice monitoring system for transmission conductor adopting OPGW (Optical Fiber Composite Overhead Ground Wire) data transmission | |
| CN110686609A (en) | Full-tunnel safety monitoring system and implementation method | |
| CN110160569A (en) | For the noise-reduction method of distributing optical fiber sensing signal, system and storage medium | |
| CN107730798B (en) | Early warning system and method | |
| CN104121945A (en) | Distributed sag online monitoring system and method for optical fiber composite overhead ground wire | |
| CN203822543U (en) | Novel monitoring system of wind generator set | |
| CN205192608U (en) | Little wind vibration of transmission line moves on -line monitoring device | |
| CN203534743U (en) | Optical fiber sensing locking rod stress detection device | |
| CN204984740U (en) | Aerogenerator tower section of thick bamboo structure monitoring system | |
| Xie et al. | Practice of optical fiber sensing technologies in power transmission lines and towers | |
| CN203519150U (en) | Shake monitoring system based on Brillouin distributed optical fiber sensing | |
| CN102562158A (en) | Intrinsically-safe distributed all-fiber downhole monitoring system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |