CN113566731A - Strain calculation method, device, equipment and medium for optical fiber composite overhead line - Google Patents
Strain calculation method, device, equipment and medium for optical fiber composite overhead line Download PDFInfo
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Abstract
The embodiment of the invention discloses a strain calculation method, a strain calculation device, strain calculation equipment and a strain calculation medium for an optical fiber composite overhead line. Wherein, the method comprises the following steps: calculating a single test frequency point matched with the optical fiber composite overhead line to be tested according to the environment temperature of the optical fiber composite overhead line to be tested and the target pulse width of the incident light pulse of the optical fiber composite overhead line to be tested; the target light pulse matched with the single test frequency point is incident to the optical fiber composite overhead line to be tested, and target Brillouin gain measured by the optical fiber composite overhead line to be tested aiming at the single test frequency point is obtained; calculating to obtain target Brillouin frequency shift according to the target Brillouin gain, the single test frequency point and a mapping relation between the single frequency point obtained by pre-fitting and strain; and calculating to obtain the current strain according to the target Brillouin frequency shift. The embodiment of the invention solves the problem of real-time strain measurement along the optical fiber composite overhead line, and realizes high measurement speed and accurate performance meeting the actual requirement.
Description
Technical Field
The embodiment of the invention relates to a computer data processing technology, in particular to a strain calculation method, a strain calculation device, strain calculation equipment and a strain calculation medium for an optical fiber composite overhead line.
Background
The Optical Fiber Composite Overhead line mainly comprises an Optical Fiber Composite Overhead Ground Wire (OPGW) and an Optical Phase Conductor (OPPC). The optical fiber unit is compounded in the circuit, which not only can play an electrical role, but also can realize the communication function, and is an important component of the power transmission and transformation system. The overhead line extends for hundreds of kilometers, and can be subjected to the effects of wind blowing, sun exposure, rain, lightning stroke, ice coating, waving, external force, mountain fire and the like in long-term operation, so that faults are inevitable, and the state of the overhead line is very necessary to be monitored to ensure the normal operation of the overhead line. With the development of artificial intelligence, the intelligence degree of equipment is urgently needed to be further improved, and people gradually refer to an overhead line with self-perception capability as an intelligent overhead line.
Conventional video and image monitoring methods, including fixed cameras and aircraft inspection modes, are very common and effective means for improving line intelligence. But for longer lines, the time consumption is longer and the efficiency is still to be further improved. Considering that the optical fiber composite overhead line is compounded with the optical fiber, the temperature, the strain and even the vibration state along the optical fiber can be measured based on the Brillouin scattering technology. The mode does not need to additionally lay a sensor, is completely integrated with the original line, and is very consistent with the idea of an intelligent overhead line. Since the brillouin frequency shift is linear with temperature and strain, both temperature and strain demodulation are typically achieved by measuring the brillouin frequency shift. The conventional method is to measure the Brillouin spectrum and then calculate the Brillouin frequency shift, wherein one Brillouin spectrum has dozens of frequency points or more, each frequency point needs to be overlapped thousands of times in order to ensure the signal to noise ratio, and the measurement time of a hundred-kilometer line spectrum reaches the minute level. This severely affects the real-time performance of strain measurements along the fiber composite overhead line based on brillouin scattering, which must be improved.
Disclosure of Invention
The embodiment of the invention provides a strain calculation method, a strain calculation device, strain calculation equipment and a strain calculation medium for an optical fiber composite overhead line, which solve the problem of real-time strain measurement along the optical fiber composite overhead line, and realize high measurement speed and accurate performance meeting actual requirements.
In a first aspect, an embodiment of the present invention provides a strain calculation method for an optical fiber composite overhead line, where the method includes:
calculating a single test frequency point matched with the optical fiber composite overhead line to be tested according to the environment temperature of the optical fiber composite overhead line to be tested and the target pulse width of the incident light pulse of the optical fiber composite overhead line to be tested;
injecting target light pulses matched with a single test frequency point to the optical fiber composite overhead line to be tested, and acquiring target Brillouin gain measured by the optical fiber composite overhead line to be tested aiming at the single test frequency point;
calculating to obtain target Brillouin frequency shift of the optical fiber composite overhead line to be tested according to the target Brillouin gain, the single test frequency point and the mapping relation between the single frequency point and the strain obtained by pre-fitting;
and calculating to obtain the current strain of the optical fiber composite overhead line to be measured according to the target Brillouin frequency shift.
In a second aspect, an embodiment of the present invention further provides a strain calculation device for an optical fiber composite overhead line, where the strain calculation device for the optical fiber composite overhead line includes:
the single test frequency point calculation module is used for calculating a single test frequency point matched with the optical fiber composite overhead line to be tested according to the environment temperature of the optical fiber composite overhead line to be tested and the target pulse width of the incident light pulse of the optical fiber composite overhead line to be tested;
the target Brillouin gain acquisition module is used for enabling target light pulses matched with the single test frequency point to be incident to the optical fiber composite overhead line to be tested and acquiring target Brillouin gain measured by the optical fiber composite overhead line to be tested aiming at the single test frequency point;
the target Brillouin frequency shift calculation module is used for calculating and obtaining the target Brillouin frequency shift of the optical fiber composite overhead line to be tested according to the target Brillouin gain, the single test frequency point and the mapping relation between the single frequency point and the strain obtained through pre-fitting;
and the current strain calculation module is used for calculating the current strain of the optical fiber composite overhead line to be measured according to the target Brillouin frequency shift.
In a third aspect, an embodiment of the present invention further provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor executes the computer program to implement the strain calculation method for an optical fiber composite overhead line according to any embodiment of the present invention.
In a fourth aspect, the present invention further provides a storage medium containing computer executable instructions, where the computer program is stored on the storage medium, and when the program is executed by a processor, the method for calculating the strain of the optical fiber composite overhead line according to any embodiment of the present invention is implemented.
According to the technical scheme provided by the embodiment of the invention, a single test frequency point matched with the optical fiber composite overhead line to be tested is calculated according to the environment temperature of the optical fiber composite overhead line to be tested and the target pulse width of the incident light pulse of the optical fiber composite overhead line to be tested; the target light pulse matched with the single test frequency point is incident to the optical fiber composite overhead line to be tested, and target Brillouin gain measured by the optical fiber composite overhead line to be tested aiming at the single test frequency point is obtained; calculating to obtain target Brillouin frequency shift according to the target Brillouin gain, the single test frequency point and a mapping relation between the single frequency point obtained by pre-fitting and strain; and calculating to obtain the current strain according to the target Brillouin frequency shift. The novel method for obtaining the strain through single test frequency point calculation is provided, the problem of real-time performance of strain measurement along the optical fiber composite overhead line is solved, the measurement speed is high, and the accuracy can meet the actual requirements.
Drawings
Fig. 1 is a flowchart of a strain calculation method for an optical fiber composite overhead line according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an optical fiber composite overhead ground wire in a strain calculation method for an optical fiber composite overhead line according to an embodiment of the present invention;
fig. 3 is a structural diagram of a strain calculation device of an optical fiber composite overhead line according to a second embodiment of the present invention;
fig. 4 is a structural diagram of a computer device according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a strain calculation method for an optical fiber composite overhead line according to an embodiment of the present invention. This embodiment can be applicable to the condition of the real-time statistics of the compound overhead line problem condition of optic fibre. The method of the embodiment may be performed by a strain calculation device of the optical fiber composite overhead line, which may be implemented by software and/or hardware, and the device may be configured in a server, typically, a server of a power grid office service system.
Correspondingly, the method specifically comprises the following steps:
s110, calculating a single test frequency point matched with the optical fiber composite overhead line to be tested according to the environment temperature of the optical fiber composite overhead line to be tested and the target pulse width of the incident light pulse of the optical fiber composite overhead line to be tested.
The optical fiber composite overhead line mainly comprises an optical fiber composite overhead ground wire and an optical fiber composite phase wire, wherein an optical fiber unit is composited in the line, so that the optical fiber composite overhead line not only can play an electrical role, but also can realize a communication function, and is an important component of a power transmission and transformation system. Taking a typical optical fiber composite overhead ground wire as an example, the structure is shown in fig. 2. Typically, the optical unit includes a plurality of optical fibers, one portion of which is used for communication and the remaining portion of which is used for sensing. The light pulse is the intermittent light emitted by the light source at a certain time interval, and the influencing factor can be the medium in the middle. Pulse width is the abbreviation for pulse width, i.e. the period over which a pulse can reach its maximum value. The single test frequency point may be a measured frequency point, and specifically, the frequency point is a number given to a fixed frequency.
Optionally, according to the ambient temperature of the optical fiber composite overhead line to be tested and the target pulse width of the incident light pulse of the optical fiber composite overhead line to be tested, calculating a single test frequency point matched with the optical fiber composite overhead line to be tested, including: according to the environment temperature of the optical fiber composite overhead line to be measured, inquiring the mapping relation between the temperature and the average value of the Brillouin frequency shift, and obtaining the average value of the target Brillouin frequency shift matched with the environment temperature; inquiring the mapping relation between the pulse width and the spectral line width according to the target pulse width of the incident light pulse of the optical fiber composite overhead line to be detected, and acquiring the target spectral line width matched with the target pulse width; and calculating to obtain a single test frequency point matched with the optical fiber composite overhead line to be tested according to the average value of the target Brillouin frequency shift and the target spectral line width.
The brillouin scattering is scattering generated by interaction between an optical wave and an acoustic wave when propagating in an optical fiber. The brillouin scattering is inelastic scattering, and frequency shift occurs after scattering, and is called brillouin frequency shift, the scattering can be divided into spontaneous brillouin scattering and stimulated brillouin scattering, the stimulated brillouin scattering is usually established on the basis of the spontaneous brillouin scattering, and particularly, the average value of the brillouin frequency shift can be calculated according to the environment temperature of the optical fiber composite overhead line. A mapping relationship is a relationship in which elements between two sets correspond to each other. The spectral line width may be a line width in the brillouin spectrum, and the reasons for the spectral line width variation may be thermal broadening, pressure broadening, electric or magnetic field broadening, and self-absorption broadening.
In this embodiment, according to the environmental temperature of the optical fiber composite overhead line, the average value of the corresponding brillouin frequency shift is calculated according to a spectrum fitting method through the measured environmental temperature. Similarly, according to the target pulse width of the incident light pulse of the optical fiber composite overhead line, the spectral line width can be calculated through the measured pulse width of the incident light pulse. And according to the obtained average value and the spectrum line width of the Brillouin frequency shift, further determining a single test frequency point matched with the optical fiber composite overhead line.
The advantages of such an arrangement are: the single test frequency point matched with the optical fiber composite overhead line can be calculated through the mean value of the environmental temperature and the Brillouin frequency shift and the mapping relation between the pulse width and the spectral line width, so that the single test frequency point obtained through calculation is accurate and convenient to calculate, a stable database can be formed, and a foundation is provided for later solving parameters such as the Brillouin frequency shift.
Optionally, calculating a single test frequency point matched with the optical fiber composite overhead line to be tested according to the target brillouin frequency shift average value and the target spectral line width, and including: according to the formula: v. of0＝vBM-ΔvBAnd/2, calculating to obtain the single test frequency point v0(ii) a Wherein v isBMIs the mean value of the Brillouin frequency shift of the target, Δ vBIs the target line width.
Wherein v in the formula of single test frequency pointBMAnd Δ vBIs calculated from the above-mentioned spectrum fitting method, and vBMAnd Δ vBThe parameters are relatively stable. For example, the ambient temperature of 10 ℃ corresponds to the mean value v of the corresponding Brillouin frequency shiftBM20 ℃ corresponding to the mean value v of the corresponding Brillouin frequency shiftBMTherefore, a database can be formed without much error. Δ vBΔ ν can be calculated primarily with respect to the target pulse width of the incident light pulse, which is generally knownBThus, the sum of the pulse widths of the incident light pulses, Δ vBOr may be a mapping relationship. According to the formula, a single test frequency point v can be obtained0。
The benefit of this arrangement is that the mean value v, through ambient temperature and brillouin shiftBMAnd pulse width and spectral line width Δ vBThe mapping relation of the optical fiber composite overhead line can be accurately calculated to obtain the single test frequency point v matched with the optical fiber composite overhead line0The calculation process is simple and convenient, and the data calculation result can be further verified according to the database formed by the mapping relation, so that the accuracy is ensured, and the error probability is avoided.
And S120, injecting the target light pulse matched with the single test frequency point to the optical fiber composite overhead line to be tested, and acquiring the target Brillouin gain measured by the optical fiber composite overhead line to be tested aiming at the single test frequency point.
The brillouin gain is an amplification factor of a parameter in the brillouin spectrum, and specifically, the gain generally refers to a degree of increase of current, voltage or power of a component, a circuit, equipment or a system, and is specified by a decibel number, that is, a unit of the gain is generally decibel and is a relative value.
In this embodiment, the single test frequency point of the optical fiber composite overhead line can be calculated through the above process, and the single test frequency point is calculated according to the working point frequency v0Measuring the corresponding Brillouin gain g by a measuring instrumentBThen carrying out Brillouin frequency shift vBAnd (4) solving.
S130, calculating to obtain the target Brillouin frequency shift of the optical fiber composite overhead line to be tested according to the target Brillouin gain, the single test frequency point and the mapping relation between the single frequency point and the strain obtained through pre-fitting.
The strain may be a certain deformation of an object under the action of an external force, and the degree of the deformation is called the strain. The strain mainly includes two types of linear strain and angular strain. The linear strain is called positive strain, and is the ratio of the length increment (positive when elongated) of a tiny line segment in a certain direction, which is generated by deformation, to the original length; angular strain, also called shear strain or shear strain, is the amount of change in the angle between two tiny line segments in mutually perpendicular directions after deformation (expressed in radians, positive as the angle decreases). The strain is related to the position of the point under consideration and the chosen direction, and the totality of the strains of the micro-elements in the vicinity of a point in the object in all possible directions is called the strain state of a point. For optical fiber composite overhead lines, line strain is mainly referred to. The brillouin frequency shift is a frequency shift generated after brillouin undergoes scattering, and is called brillouin frequency shift, specifically, brillouin scattering is scattering generated by interaction between an optical wave and an acoustic wave when the optical wave and the acoustic wave propagate in an optical fiber.
Optionally, the calculating of the target brillouin frequency shift of the optical fiber composite overhead line to be measured according to the target brillouin gain, the single test frequency point, and the mapping relationship between the single frequency point obtained by pre-fitting and the strain includes: according to the mapping relation:
when v ═ v0Calculating to obtain the target Brillouin frequency shift v of the optical fiber composite overhead line to be measuredB(ii) a Wherein, g1、g2Using a preset objective function to perform pre-fitting on the mapping relation to obtain gB(v0) Is the target brillouin gain.
The objective function is a function of the design variables and is a scalar, and the objective function is a performance standard of the system in an engineering sense. The fitting may be a series of points on a plane connected by a smooth curve, because of the myriad possibilities of this curve, and thus various fitting methods, the curve to be fitted may be generally expressed as a function, and common fitting methods such as least squares curve fitting, etc.
In this embodiment, because the brillouin spectrum approximately satisfies the pseudo Voigt model, the brillouin spectrum may be fitted by a least square fitting method based on the model to obtain the brillouin frequency shift. The corresponding objective function is
In the formula, E is the square sum of gain errors, N is the frequency sweeping point number of the Brillouin spectrum, and vnIs the nth swept frequency point, gBnIs v isnThe corresponding brillouin gain measurement. According to the objective function
To pair
G in (1)1、g2、vB、ΔvBAnd the parameter fitting is performed by using a least square fitting method. Therefore, corresponding parameters can be obtained, and then the target Brillouin frequency shift of the optical fiber composite overhead line is solved. The Voigt model, a mechanical model of simple linear viscoelastic behavior, is formed by connecting a spring with an elastic modulus E and a viscous pot with a viscosity coefficient eta in parallel, is also called a Kelvin model, and can be used for simulating a creep process of a cross-linked polymer.
The advantages of such an arrangement are: the objective function is fitted by using a least square fitting method to obtain a more optimized parameter value, so that the Brillouin frequency shift is more accurately solved, and the strain condition of the optical fiber composite overhead line can be more accurately reflected in real time.
Optionally, after obtaining the target brillouin frequency shift of the optical fiber composite overhead line to be measured by calculation, the method further includes: calculating to obtain a critical signal-to-noise ratio matched with the optical fiber composite overhead line to be tested according to the target Brillouin frequency shift, the target spectral line width and the single test frequency point; and if the workload gain signal-to-noise ratio matched with the optical fiber composite overhead line to be detected is determined to be greater than or equal to the critical signal-to-noise ratio, determining that the current strain of the optical fiber composite overhead line to be detected meets the accuracy requirement.
The snr refers to a ratio of signal to noise in an electronic device or electronic system. The signal refers to an electronic signal which comes from the outside of the equipment and needs to be processed by the equipment, the noise refers to an irregular extra signal which does not exist in an original signal generated after the equipment passes through, and the signal does not change along with the change of the original signal. The critical signal-to-noise ratio refers to the minimum signal-to-noise ratio limit in the optical fiber composite overhead line. Specifically, when the signal-to-noise ratio is smaller than the critical signal-to-noise ratio, the calculated errors of parameters such as brillouin frequency shift and current strain are larger. Therefore, the workload gain signal-to-noise ratio needs to be greater than or equal to the critical signal-to-noise ratio.
In this embodiment, the signal-to-noise ratio of the operating point gain can be no less than 25dB or the signal-to-noise ratio can be no less than the corresponding critical signal-to-noise ratio value R in the following equation. The calculation formula is as follows:
wherein R is the critical signal-to-noise ratio corresponding to 3MHz, and the unit is dB. Calculating to obtain the critical signal-to-noise ratio matched with the optical fiber composite overhead line to be tested through the target Brillouin frequency shift, the target spectral line width and the single test frequency point, and calculating if the workload gain signal-to-noise ratio is larger than or equal to the critical signal-to-noise ratioAnd calculating to obtain the current strain of the optical fiber composite overhead line to be measured, wherein the corresponding strain result is accurate.
The advantages of such an arrangement are: the critical signal-to-noise ratio matched with the optical fiber composite overhead line to be tested is obtained through calculation according to the target Brillouin frequency shift, the target spectral line width and the single test frequency point, the critical signal-to-noise ratio required by accurate strain of the optical fiber composite overhead line can be obtained, and the condition that strain errors are large due to the fact that the workload gain signal-to-noise ratio is smaller than the critical signal-to-noise ratio is avoided. Therefore, the obtained strain result is real-time and accurate, the measurement speed is high, and the accuracy can meet the actual requirement.
And S140, calculating to obtain the current strain of the optical fiber composite overhead line to be measured according to the target Brillouin frequency shift.
Optionally, calculating to obtain the current strain of the optical fiber composite overhead line to be measured according to the target brillouin frequency shift includes: according to the formula:
calculating to obtain the current strain of the optical fiber composite overhead line to be measured; wherein v isBOIs a brillouin frequency shift at constant temperature and without strain,
the strain coefficient of Brillouin frequency shift is shown, and epsilon is the current strain.
Wherein the strain coefficient of Brillouin frequency shift
A typical value of (a) is 20 mu epsilon/MHz.
Optionally, after the current strain of the optical fiber composite overhead line to be measured is obtained through calculation, the method further includes: and if the current strain of the optical fiber composite overhead line to be detected is determined not to meet the standard strain range condition, performing line early warning on the optical fiber composite overhead line to be detected.
When the line is iced, the optical fiber composite overhead line is subjected to external force, and the optical fiber line is stretched due to the influence of gravity, so that the current strain epsilon changes correspondingly. For example, if the original optical fiber is 1 m, and is elongated to 1.01 m due to ice coating, the current strain is 1%. When the strain is not equal to the current strain, the line warning of the optical fiber composite overhead line can be carried out, and the warning is fed back to the side of a worker to carry out line processing.
In this embodiment, the current strain can be calculated by the brillouin frequency shift, the brillouin frequency shift at a constant temperature and without strain, and the strain coefficient of the brillouin frequency shift. When the current strain parameters in the line change, the corresponding optical fiber composite overhead line can receive the influence of external force. Therefore, the line early warning of the optical fiber composite overhead line is carried out, and when the staff receives the early warning, the line processing is carried out.
The advantages of such an arrangement are: the current strain is calculated, so that the condition of the optical fiber composite overhead line can be visually and accurately reflected, and the line early warning can be carried out to inform relevant personnel in real time. Therefore, the measuring speed is high, and the accuracy can meet the actual requirement.
According to the technical scheme provided by the embodiment of the invention, a single test frequency point matched with the optical fiber composite overhead line to be tested is calculated according to the environment temperature of the optical fiber composite overhead line to be tested and the target pulse width of the incident light pulse of the optical fiber composite overhead line to be tested; the target light pulse matched with the single test frequency point is incident to the optical fiber composite overhead line to be tested, and target Brillouin gain measured by the optical fiber composite overhead line to be tested aiming at the single test frequency point is obtained; calculating to obtain target Brillouin frequency shift according to the target Brillouin gain, the single test frequency point and a mapping relation between the single frequency point obtained by pre-fitting and strain; and calculating to obtain the current strain according to the target Brillouin frequency shift. The novel method for obtaining the strain through single test frequency point calculation is provided, the problem of real-time performance of strain measurement along the optical fiber composite overhead line is solved, the measurement speed is high, and the accuracy can meet the actual requirements.
Example two
Fig. 3 is a structural diagram of a strain calculation device for an optical fiber composite overhead line according to a second embodiment of the present invention, where the strain calculation device for an optical fiber composite overhead line according to the second embodiment of the present invention can be implemented by software and/or hardware, and can be configured in a server to implement a strain calculation method for an optical fiber composite overhead line according to the second embodiment of the present invention. As shown in fig. 3, the apparatus may specifically include: the single test frequency point calculation module 210, the target brillouin gain acquisition module 220, the target brillouin frequency shift calculation module 230, and the current strain calculation module 240.
The single test frequency point calculation module 210 is configured to calculate a single test frequency point matched with the optical fiber composite overhead line to be tested according to the ambient temperature of the optical fiber composite overhead line to be tested and the target pulse width of the incident light pulse of the optical fiber composite overhead line to be tested;
the target brillouin gain acquisition module 220 is configured to inject a target light pulse matched with a single test frequency point into the optical fiber composite overhead line to be tested, and acquire a target brillouin gain measured by the optical fiber composite overhead line to be tested for the single test frequency point;
the target Brillouin frequency shift calculation module 230 is used for calculating the target Brillouin frequency shift of the optical fiber composite overhead line to be tested according to the target Brillouin gain, the single test frequency point and the mapping relation between the single frequency point and the strain obtained by pre-fitting;
and the current strain calculation module 240 is configured to calculate the current strain of the optical fiber composite overhead line to be measured according to the target brillouin frequency shift.
According to the technical scheme provided by the embodiment of the invention, a single test frequency point matched with the optical fiber composite overhead line to be tested is calculated according to the environment temperature of the optical fiber composite overhead line to be tested and the target pulse width of the incident light pulse of the optical fiber composite overhead line to be tested; the target light pulse matched with the single test frequency point is incident to the optical fiber composite overhead line to be tested, and target Brillouin gain measured by the optical fiber composite overhead line to be tested aiming at the single test frequency point is obtained; calculating to obtain target Brillouin frequency shift according to the target Brillouin gain, the single test frequency point and a mapping relation between the single frequency point obtained by pre-fitting and strain; and calculating to obtain the current strain according to the target Brillouin frequency shift. The novel method for obtaining the strain through single test frequency point calculation is provided, the problem of real-time performance of strain measurement along the optical fiber composite overhead line is solved, the measurement speed is high, and the accuracy can meet the actual requirements.
On the basis of the foregoing embodiments, the single test frequency point calculating module 210 may be specifically configured to:
according to the environment temperature of the optical fiber composite overhead line to be measured, inquiring the mapping relation between the temperature and the average value of the Brillouin frequency shift, and obtaining the average value of the target Brillouin frequency shift matched with the environment temperature;
inquiring the mapping relation between the pulse width and the spectral line width according to the target pulse width of the incident light pulse of the optical fiber composite overhead line to be detected, and acquiring the target spectral line width matched with the target pulse width;
and calculating to obtain a single test frequency point matched with the optical fiber composite overhead line to be tested according to the average value of the target Brillouin frequency shift and the target spectral line width.
On the basis of the foregoing embodiments, the single test frequency point calculating module 210 may be specifically configured to:
according to the formula: v. of0＝vBM-ΔvBAnd/2, calculating to obtain the single test frequency point v0；
Wherein v isBMIs the mean value of the Brillouin frequency shift of the target, Δ vBIs the target line width.
On the basis of the foregoing embodiments, the target brillouin frequency shift calculation module 230 may be specifically configured to:
according to the mapping relation:
when v ═ v0Calculating to obtain the target Brillouin frequency shift v of the optical fiber composite overhead line to be measuredB；
Wherein, g1、g2Using a preset objective function to carry out the mappingObtained by line pre-fitting, gB(v0) Is the target brillouin gain.
On the basis of the above embodiments, the current strain calculation module 240 may be specifically configured to:
according to the formula:
calculating to obtain the current strain of the optical fiber composite overhead line to be measured;
wherein v isBOIs a brillouin frequency shift at constant temperature and without strain,
the strain coefficient of Brillouin frequency shift is shown, and epsilon is strain.
On the basis of the foregoing embodiments, the target brillouin frequency shift calculation module 230 may be further specifically configured to:
calculating to obtain a critical signal-to-noise ratio matched with the optical fiber composite overhead line to be tested according to the target Brillouin frequency shift, the target spectral line width and the single test frequency point;
and if the workload gain signal-to-noise ratio matched with the optical fiber composite overhead line to be detected is determined to be greater than or equal to the critical signal-to-noise ratio, determining that the current strain of the optical fiber composite overhead line to be detected meets the accuracy requirement.
On the basis of the foregoing embodiments, the current strain calculation module 240 may be further specifically configured to:
and if the current strain of the optical fiber composite overhead line to be detected is determined not to meet the standard strain range condition, performing line early warning on the optical fiber composite overhead line to be detected.
The strain calculation device of the optical fiber composite overhead line can execute the strain calculation method of the optical fiber composite overhead line provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
EXAMPLE III
Fig. 4 is a structural diagram of a computer device according to a third embodiment of the present invention. As shown in fig. 4, the apparatus includes a processor 310, a memory 320, an input device 330, and an output device 340; the number of the processors 310 in the device may be one or more, and one processor 310 is taken as an example in fig. 4; the processor 310, the memory 320, the input device 330 and the output device 340 in the apparatus may be connected by a bus or other means, and fig. 4 illustrates the connection by a bus as an example.
The memory 320 is a computer-readable storage medium, and can be used to store software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the strain calculation method for the optical fiber composite overhead line in the embodiment of the present invention (for example, the single test frequency point calculation module 210, the target brillouin gain acquisition module 220, the target brillouin frequency shift calculation module 230, and the current strain calculation module 240). The processor 310 executes various functional applications and data processing of the device by running software programs, instructions and modules stored in the memory 320, so as to implement the strain calculation method for the optical fiber composite overhead line, which includes:
calculating a single test frequency point matched with the optical fiber composite overhead line to be tested according to the environment temperature of the optical fiber composite overhead line to be tested and the target pulse width of the incident light pulse of the optical fiber composite overhead line to be tested;
injecting target light pulses matched with a single test frequency point to the optical fiber composite overhead line to be tested, and acquiring target Brillouin gain measured by the optical fiber composite overhead line to be tested aiming at the single test frequency point;
calculating to obtain target Brillouin frequency shift of the optical fiber composite overhead line to be tested according to the target Brillouin gain, the single test frequency point and the mapping relation between the single frequency point and the strain obtained by pre-fitting;
and calculating to obtain the current strain of the optical fiber composite overhead line to be measured according to the target Brillouin frequency shift.
The memory 320 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 320 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 320 may further include memory located remotely from the processor 310, which may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 330 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function controls of the apparatus. The output device 340 may include a display device such as a display screen.
Example four
A fourth embodiment of the present invention further provides a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a method for strain calculation of an optical fiber composite overhead line, the method including:
calculating a single test frequency point matched with the optical fiber composite overhead line to be tested according to the environment temperature of the optical fiber composite overhead line to be tested and the target pulse width of the incident light pulse of the optical fiber composite overhead line to be tested;
injecting target light pulses matched with a single test frequency point to the optical fiber composite overhead line to be tested, and acquiring target Brillouin gain measured by the optical fiber composite overhead line to be tested aiming at the single test frequency point;
calculating to obtain target Brillouin frequency shift of the optical fiber composite overhead line to be tested according to the target Brillouin gain, the single test frequency point and the mapping relation between the single frequency point and the strain obtained by pre-fitting;
and calculating to obtain the current strain of the optical fiber composite overhead line to be measured according to the target Brillouin frequency shift.
Of course, the storage medium provided by the embodiment of the present invention contains computer executable instructions, and the computer executable instructions are not limited to the method operations described above, and may also perform related operations in the strain calculation method for the optical fiber composite overhead line provided by any embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the above search apparatus, each included unit and module are merely divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A strain calculation method of an optical fiber composite overhead line is characterized by comprising the following steps:
calculating a single test frequency point matched with the optical fiber composite overhead line to be tested according to the environment temperature of the optical fiber composite overhead line to be tested and the target pulse width of the incident light pulse of the optical fiber composite overhead line to be tested;
injecting target light pulses matched with a single test frequency point to the optical fiber composite overhead line to be tested, and acquiring target Brillouin gain measured by the optical fiber composite overhead line to be tested aiming at the single test frequency point;
calculating to obtain target Brillouin frequency shift of the optical fiber composite overhead line to be tested according to the target Brillouin gain, the single test frequency point and the mapping relation between the single frequency point and the strain obtained by pre-fitting;
and calculating to obtain the current strain of the optical fiber composite overhead line to be measured according to the target Brillouin frequency shift.
2. The method according to claim 1, wherein calculating a single test frequency point matched with the optical fiber composite overhead line to be tested according to the ambient temperature of the optical fiber composite overhead line to be tested and the target pulse width of the incident light pulse of the optical fiber composite overhead line to be tested comprises:
according to the environment temperature of the optical fiber composite overhead line to be measured, inquiring the mapping relation between the temperature and the average value of the Brillouin frequency shift, and obtaining the average value of the target Brillouin frequency shift matched with the environment temperature;
inquiring the mapping relation between the pulse width and the spectral line width according to the target pulse width of the incident light pulse of the optical fiber composite overhead line to be detected, and acquiring the target spectral line width matched with the target pulse width;
and calculating to obtain a single test frequency point matched with the optical fiber composite overhead line to be tested according to the average value of the target Brillouin frequency shift and the target spectral line width.
3. The method according to claim 2, wherein calculating a single test frequency point matched with the optical fiber composite overhead line to be tested according to the target Brillouin frequency shift average value and the target spectral line width comprises:
according to the formula: v. of0＝vBM-ΔvBAnd/2, calculating to obtain the single test frequency point v0；
Wherein v isBMIs the mean value of the Brillouin frequency shift of the target, Δ vBIs the target line width.
4. The method according to claim 3, wherein the step of calculating the target Brillouin frequency shift of the optical fiber composite overhead line to be tested according to the target Brillouin gain, the single test frequency point and the mapping relation between the single frequency point and the strain obtained by pre-fitting comprises the following steps:
according to the mapping relation:
when v ═ v0Calculating to obtain the target Brillouin frequency shift v of the optical fiber composite overhead line to be measuredB；
Wherein, g1、g2Using a preset objective function to perform pre-fitting on the mapping relation to obtain gB(v0) Is the target brillouin gain.
5. The method according to claim 1, wherein the step of calculating the current strain of the optical fiber composite overhead line to be tested according to the target Brillouin frequency shift comprises the following steps:
according to the formula:
calculating to obtain the current strain of the optical fiber composite overhead line to be measured;
wherein v isBOIs a brillouin frequency shift at constant temperature and without strain,
the strain coefficient of Brillouin frequency shift is shown, and epsilon is strain.
6. The method according to claim 2, wherein after calculating the target Brillouin frequency shift of the optical fiber composite overhead line to be tested, the method further comprises:
calculating to obtain a critical signal-to-noise ratio matched with the optical fiber composite overhead line to be tested according to the target Brillouin frequency shift, the target spectral line width and the single test frequency point;
and if the workload gain signal-to-noise ratio matched with the optical fiber composite overhead line to be detected is determined to be greater than or equal to the critical signal-to-noise ratio, determining that the current strain of the optical fiber composite overhead line to be detected meets the accuracy requirement.
7. The method of claim 5, wherein after calculating the current strain of the optical fiber composite overhead line to be tested, the method further comprises:
and if the current strain of the optical fiber composite overhead line to be detected is determined not to meet the standard strain range condition, performing line early warning on the optical fiber composite overhead line to be detected.
8. A strain calculation device for an optical fiber composite overhead line, comprising:
the single test frequency point calculation module is used for calculating a single test frequency point matched with the optical fiber composite overhead line to be tested according to the environment temperature of the optical fiber composite overhead line to be tested and the target pulse width of the incident light pulse of the optical fiber composite overhead line to be tested;
the target Brillouin gain acquisition module is used for enabling target light pulses matched with the single test frequency point to be incident to the optical fiber composite overhead line to be tested and acquiring target Brillouin gain measured by the optical fiber composite overhead line to be tested aiming at the single test frequency point;
the target Brillouin frequency shift calculation module is used for calculating and obtaining the target Brillouin frequency shift of the optical fiber composite overhead line to be tested according to the target Brillouin gain, the single test frequency point and the mapping relation between the single frequency point and the strain obtained through pre-fitting;
and the current strain calculation module is used for calculating the current strain of the optical fiber composite overhead line to be measured according to the target Brillouin frequency shift.
9. 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 processor, when executing the computer program, implements a strain calculation method for a fiber composite overhead line according to any one of claims 1-7.
10. A storage medium having computer-executable instructions stored thereon, the program being characterized in that the program, when being executed by a processor, implements a strain calculation method for an optical fiber composite overhead line according to any one of claims 1 to 7.
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