CN115359642A - External damage prevention early warning method, device, equipment and storage medium by using optical cable - Google Patents
External damage prevention early warning method, device, equipment and storage medium by using optical cable Download PDFInfo
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- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
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- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
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Abstract
The invention relates to the technical field of optical fiber sensing detection, and discloses an anti-external-damage early warning method, an apparatus, equipment and a storage medium by using an optical cable. Based on frequency domain information, spatial domain information and time domain information, optical signal analysis in multiple dimensions is realized, time continuity and space continuity are realized, and therefore the problems that in the prior art, only one or more key positions can be monitored, and continuous monitoring and early warning in a long-distance space are realized by a digging method are solved.
Description
Technical Field
The invention relates to the technical field of optical fiber sensing detection, in particular to an external damage prevention early warning method, device, equipment and storage medium by utilizing an optical cable.
Background
In recent years, construction phenomena such as excavation and vibration often occur in environmental construction, facilities and the like in various places, and these construction phenomena have a certain destructive influence on underground lines, and the damage of the lines becomes more serious due to long-term accumulation.
Therefore, it is ensured that the lines are not damaged by external force, and at present, the detection is mainly performed on each line well by constructors regularly, or the detection is performed by using an optical fiber sensing system, but the existing optical fiber sensing system only has the defect of monitoring one or a plurality of key positions, and cannot realize continuous measurement realization and early warning monitoring on a monitoring space of dozens of kilometers or even hundreds of kilometers.
Disclosure of Invention
The invention provides an external damage prevention early warning method, device, equipment and storage medium by using an optical cable, and mainly aims to solve the problems that in the prior art, only one or more key positions can be monitored, and continuous monitoring and early warning in a long-distance space are realized by an excavation method.
The invention provides an external damage prevention early warning method by using an optical cable, which is applied to an external damage prevention early warning system, wherein the external damage prevention early warning system comprises a phase sensitive optical time domain reflection device and a server, and the external damage prevention early warning method comprises the following steps:
the phase sensitive optical time domain reflection device acquires backward Rayleigh scattered light signals returned by continuous N detection light pulse periods of an optical fiber in the optical cable, and analyzes the N backward Rayleigh scattered light signals to obtain N backward Rayleigh scattered light intensity data;
the server analyzes the N backward Rayleigh scattering light intensity data and determines frequency domain information, space domain information and time domain information of each position point in the optical cable; the frequency domain information is phase change obtained by analyzing a construction function based on light intensity data from a frequency dimension, the spatial domain information is the number of times that each defense area of the optical cable exceeds an amplitude threshold at each moment, and the time domain information is the number of times that each defense area exceeds the amplitude threshold for a period of time; identifying intrusion events and abnormal distribution of each defense area of the optical cable based on the frequency domain information, the spatial domain information and the time domain information; and early warning is carried out based on the intrusion events and the abnormal distribution of each defense area.
Optionally, in a first implementation manner of the first aspect of the present invention, the N backward rayleigh scattered light intensity data are light intensity distribution data; the server analyzes the N backward Rayleigh scattering optical signals to obtain N backward Rayleigh scattering light intensity data, and the method comprises the following steps:
the server extracts the frequency, amplitude and phase of each backward Rayleigh scattering optical signal;
calculating a corresponding light field intensity value based on a preset light field intensity distribution function, each frequency, each amplitude and each phase;
and determining light intensity distribution data corresponding to the N backward Rayleigh scattering light signals based on each light field intensity value.
Optionally, in a second implementation manner of the first aspect of the present invention, the calculating, based on a preset optical field intensity distribution function, each of the frequencies, each of the amplitudes, and each of the phases, a corresponding optical field intensity value includes:
calculating corresponding direct current term parameters based on a preset light field intensity distribution function and each amplitude;
calculating corresponding alternating current item parameters based on a preset light field intensity distribution function, each frequency and each phase;
and calculating the corresponding light field intensity value based on the direct current term parameter and the alternating current term parameter.
Optionally, in a third implementation manner of the first aspect of the present invention, the light field intensity distribution function is:
wherein the content of the first and second substances,
is a backward Rayleigh scattering optical signal, t is a time parameter,
is the amplitude of the back-rayleigh scattered light signal,
is the phase of the back-rayleigh scattered light signal,
is the frequency of the backward rayleigh scattered light signal.
Optionally, in a fourth implementation manner of the first aspect of the present invention, the analyzing the N backward rayleigh scattering light intensity data to determine frequency domain information, spatial domain information, and time domain information of each position point in the optical cable includes:
acquiring an amplitude threshold value of each position point of the optical cable, and calculating corresponding space domain information and time domain information based on the amplitude threshold value and the amplitude;
and calculating frequency domain information of each position point in the optical cable based on the frequency and the amplitude of the N backward Rayleigh scattering optical signals.
Optionally, in a fifth implementation manner of the first aspect of the present invention, the identifying, based on the frequency domain information, the spatial domain information, and the time domain information, the intrusion event and the abnormal distribution of each defense area of the optical cable includes:
acquiring normal frequency domain information preset by each position point, calculating a frequency domain difference value between the normal frequency domain information and the frequency domain information, and determining an intrusion event corresponding to each defense area based on the frequency domain difference value of each position point;
and determining abnormal distribution of each defense area of the optical cable based on the time domain information and the time domain information.
Optionally, in a sixth implementation manner of the first aspect of the present invention, the performing early warning based on the intrusion event and the abnormal distribution includes:
inquiring defense area information of each defense area of the optical cable from a database based on the identification information of the optical cable;
inquiring a corresponding early warning display mode from a preset early warning display mode table based on the intrusion event of each defense area;
and generating a corresponding thermodynamic diagram based on the abnormal distribution, the early warning display modes and the defense area information of the defense areas, and displaying to realize early warning.
A second aspect of the present invention provides an external damage prevention early warning device using an optical cable, including:
the acquisition module is used for acquiring backward Rayleigh scattered light signals returned by continuous N detection light pulses of the optical fiber in the optical cable, and analyzing the N backward Rayleigh scattered light signals to obtain N backward Rayleigh scattered light intensity data;
the analysis module is used for analyzing the N backward Rayleigh scattering light intensity data and determining frequency domain information, space domain information and time domain information of each position point in the optical cable; the frequency domain information is phase change obtained by analyzing a construction function based on light intensity data from a frequency dimension, the spatial domain information is the number of times that each defense area of the optical cable exceeds an amplitude threshold at each moment, and the time domain information is the number of times that each defense area exceeds the amplitude threshold for a period of time;
the identification module is used for identifying the intrusion event and abnormal distribution of each defense area of the optical cable based on the frequency domain information, the spatial domain information and the time domain information;
and the early warning module is used for early warning based on the intrusion events and the abnormal distribution of each defense area.
Optionally, in a first implementation manner of the second aspect of the present invention, the obtaining module includes
An extraction unit, configured to extract a frequency, an amplitude, and a phase of each of the backward rayleigh scattered light signals when the N backward rayleigh scattered light intensity data are light intensity distribution data;
the first calculation unit is used for calculating corresponding light field intensity values based on a preset light field intensity distribution function, each frequency, each amplitude and each phase;
and the determining unit is used for determining light intensity distribution data corresponding to the N backward Rayleigh scattering light signals based on each light field intensity value.
Optionally, in a second implementation manner of the second aspect of the present invention, the first computing unit is specifically configured to:
calculating corresponding direct current term parameters based on a preset light field intensity distribution function and each amplitude;
calculating corresponding alternating current item parameters based on a preset light field intensity distribution function, each frequency and each phase;
and calculating the corresponding light field intensity value based on the direct current term parameters and the alternating current term parameters.
Optionally, in a third implementation manner of the second aspect of the present invention, the light field intensity distribution function is:
wherein, the first and the second end of the pipe are connected with each other,
is a backward Rayleigh scattering optical signal, t is a time parameter,
is the amplitude of the back-rayleigh scattered light signal,
is the phase of the back-rayleigh scattered light signal,
is the frequency of the backscattered Rayleigh light signal.
Optionally, in a fourth implementation manner of the second aspect of the present invention, the analysis module includes:
the second calculation unit is used for acquiring an amplitude threshold value of each position point of the optical cable and calculating corresponding space domain information and time domain information based on the amplitude threshold value and the amplitude;
and the third calculating unit is used for calculating frequency domain information of each position point in the optical cable based on the frequency and the amplitude of the N backward Rayleigh scattering optical signals.
Optionally, in a fifth implementation manner of the second aspect of the present invention, the identification module includes:
the event identification unit is used for acquiring the preset normal frequency domain information of each position point, calculating the frequency domain difference value between the normal frequency domain information and the frequency domain information, and determining the intrusion event corresponding to each defense area based on the frequency domain difference value of each position point;
and the distribution determining unit is used for determining abnormal distribution of each defense area of the optical cable based on the time domain information and the time domain information.
Optionally, in a sixth implementation manner of the second aspect of the present invention, the early warning module includes:
the query unit is used for querying the defense area information of each defense area of the optical cable from a database based on the identification information of the optical cable; inquiring a corresponding early warning display mode from a preset early warning display mode table based on the intrusion event of each defense area;
and the early warning generation unit is used for generating corresponding thermodynamic diagrams based on the abnormal distribution, the early warning display modes of the defense areas and the defense area information, and displaying the thermodynamic diagrams to realize early warning.
A third aspect of the present invention provides an external-damage-prevention early warning device, including: a memory having instructions stored therein and at least one processor, the memory and the at least one processor interconnected by a line; the at least one processor calls the instructions in the memory to cause the anti-vandalism early warning device to execute the steps of the anti-vandalism early warning method using the optical cable.
A fourth aspect of the present invention provides a computer-readable storage medium having stored therein instructions, which, when run on a computer, cause the computer to perform the above-mentioned steps of the anti-breach early warning method using optical cable.
According to the technical scheme, backward Rayleigh scattering light intensity data of backward Rayleigh scattering light signals returned by N continuous detection light pulse periods are analyzed, frequency domain information, space domain information and time domain information of the optical cable are analyzed based on the backward Rayleigh scattering light intensity data, invasion events and abnormal distribution of each defense area of the optical cable are identified based on the frequency domain information, the space domain information and the time domain information, and early warning is carried out based on the invasion events and the abnormal distribution of each defense area. Based on frequency domain information, spatial domain information and time domain information, optical signal analysis in multiple dimensions is realized, time continuity and space continuity are realized, and therefore the problems that in the prior art, only one or more key positions can be monitored, and continuous monitoring and early warning in a long-distance space are realized by a digging method are solved.
Drawings
Fig. 1 is a schematic diagram of a first embodiment of an anti-external damage early warning method using an optical cable according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a second embodiment of the early warning method for preventing external damage by using an optical cable according to the embodiment of the present invention;
FIG. 3 is a diagram illustrating a phase change of Rayleigh scattering caused by disturbance according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a variation of a position-resolved amplitude with time according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an embodiment of an anti-external damage early warning device using an optical cable according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another embodiment of the anti-external damage early warning device using the optical cable according to the embodiment of the present invention;
fig. 7 is a schematic diagram of an embodiment of an anti-vandalism early warning device in the embodiment of the present invention.
Detailed Description
In order to solve the problems, the invention directly analyzes and analyzes the backward Rayleigh scattering optical field data generated in the optical cable by utilizing a phase-sensitive optical time domain reflection system (phi-OTDR) to obtain frequency domain information, space domain information and time domain information, and realizes the analysis of the optical cable on continuous space and continuous time based on the information, thereby realizing the integral monitoring of the long-distance optical cable and solving the problems that the existing optical sensing system can only monitor one or more position points in the optical fiber and cannot realize the monitoring of the long-distance continuous time and space.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," or "having," and any variations thereof, are intended to cover non-exclusive inclusions, 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.
To facilitate understanding, a specific process of the embodiment of the present invention is described below, and with reference to fig. 1, the method for preventing external damage by using an optical cable provided in the embodiment is applied to an external damage prevention early warning system, where the system includes a phase-sensitive optical time domain reflection apparatus and a server, and specifically includes the following steps:
101, a phase sensitive optical time domain reflection device acquires backward rayleigh scattered light signals returned by continuous N detection optical pulse periods of an optical fiber in an optical cable, and analyzes the N backward rayleigh scattered light signals to obtain N backward rayleigh scattered light intensity data;
in this embodiment, the backward rayleigh scattered light signal is an optical signal refracted back by an optical fiber based on an original optical signal emitted by a phase-sensitive optical time domain reflection system, a data analysis period is set on the phase-sensitive optical time domain reflection system, the backward rayleigh scattered light signal reflected back in the optical fiber is received, after the number of the received backward rayleigh scattered light signals or the data analysis period arrives is counted, N received backward rayleigh scattered light signals are combined into a signal sequence, then the N backward rayleigh scattered light signals are respectively analyzed according to the sequence of receiving time, parameters in each backward rayleigh scattered light signal are extracted through analysis, and backward rayleigh scattered light intensity data are constructed according to a construction function of light intensity data based on the parameters.
102, analyzing the N backward Rayleigh scattering light intensity data by the server, and determining frequency domain information, spatial domain information and time domain information of each position point in the optical cable;
in this embodiment, the light intensity data of the backward rayleigh scattering is actually the light intensity distribution of the light field of the optical signal, and parameters such as frequency, amplitude and phase in the received backward rayleigh scattering light signal are extracted by analyzing the parameters thereof, and based on these parameters, the corresponding light intensity values are calculated by using the light field intensity distribution function, and finally, based on each light intensity value, N pieces of light intensity distribution data corresponding to the backward rayleigh scattering light signal are generated.
In practical application, a spectrogram is constructed based on N pieces of backward Rayleigh scattering light intensity data, and frequency domain information, space domain information and time domain information are calculated from frequency, space and time angles respectively on the basis of amplitudes by analyzing amplitudes of vertical and horizontal coordinates in the spectrogram.
103, identifying intrusion events and abnormal distribution of each defense area of the optical cable by the server based on the frequency domain information, the spatial domain information and the time domain information;
in this embodiment, the frequency domain information is obtained by analyzing the frequency dimension based on the construction function of the light intensity data, and specifically, is obtained by calculating the phase change of each position point in the backward rayleigh scattering light intensity data.
In practical application, if the analysis is performed based on the spectrogram, the intrusion event is determined by reading a spectrum ordinate value on each position point of the optical cable corresponding to the spectrogram, determining frequency domain information based on the ordinate value, and comparing the frequency domain information with preset non-abnormal frequency domain information based on the frequency domain information, or by calculating a difference between the frequency domain information and the preset non-abnormal frequency domain information to match with preset frequencies of different intrusion events.
Further, after determining the frequency domain information and the difference between the frequency domain information and the normal condition, sorting according to time and space dimensions based on the frequency domain information and the difference to obtain abnormal distribution, wherein the abnormal distribution is specifically a distribution map of the intrusion event or map information.
And 104, the server performs early warning based on the intrusion events and abnormal distribution of each defense area.
In the step, the early warning is to determine an early warning display mode based on the intrusion event, and also comprises positioning the position of the intrusion event, so that the position of the intrusion event and the early warning display mode are displayed in abnormal distribution.
According to the technical scheme, backward Rayleigh scattering light intensity data of backward Rayleigh scattering light signals returned by N continuous detection light pulse periods are analyzed, frequency domain information, space domain information and time domain information of the optical cable are analyzed based on the backward Rayleigh scattering light intensity data, invasion events and abnormal distribution of each defense area of the optical cable are identified based on the frequency domain information, the space domain information and the time domain information, and early warning is carried out based on the invasion events and the abnormal distribution of each defense area. Based on frequency domain information, spatial domain information and time domain information, optical signal analysis on multiple dimensions is achieved, time continuity and space continuity are achieved, and therefore the problems that in the prior art, only one or a plurality of key positions can be monitored, and continuous monitoring and early warning in a long-distance space are achieved through a digging method are solved.
Referring to fig. 2, a second embodiment of the early warning method for preventing external damage by using an optical cable in the embodiment of the present invention is implemented based on a phase-sensitive optical time domain reflection system, where the phase-sensitive optical time domain reflection system includes a physical sensing layer, a data processing layer, a logic processing layer, and a service presentation layer, and a directly detected phase-sensitive optical time domain reflection system (Φ -OTDR) is used to perform the early warning for preventing external damage. Continuous light emitted by the narrow-line-width light source is modulated into pulse light through the pulse modulator, amplified through the optical amplifier and then enters the sensing optical fiber through the circulator; backward Rayleigh scattered light generated in the process of light pulse propagation returns to the optical circulator, an electric signal is generated by receiving the light by the photoelectric detector, and the electric signal is acquired and converted into a digital signal by the data acquisition card and transmitted to the rear end for processing and displaying. The method specifically comprises the following steps:
201, a phase-sensitive optical time domain reflection device acquires backward rayleigh scattered light signals returned by continuous N detection light pulse cycles of an optical fiber in an optical cable, and analyzes the N backward rayleigh scattered light signals to obtain N backward rayleigh scattered light intensity data;
in this embodiment, analyzing the N backward rayleigh scattered light signals to obtain N backward rayleigh scattered light intensity data specifically includes: extracting the frequency, amplitude and phase of each backward Rayleigh scattering optical signal; calculating a corresponding light field intensity value based on a preset light field intensity distribution function, each frequency, each amplitude and each phase; and determining light intensity distribution data corresponding to the N backward Rayleigh scattering light signals based on each light field intensity value.
Further, after extracting the frequency, the amplitude and the phase, an expression obtained by constructing a backward rayleigh scattered light signal is included, and the expression is:
in the formula (1), the acid-base catalyst,
is a backward Rayleigh scattering optical signal, t is a time parameter,
is the amplitude of the back-rayleigh scattered light signal,
is the phase of the back-rayleigh scattered light signal,
is the frequency of the backward rayleigh scattered light signal.
Wherein, the light field intensity value based on the preset light field intensity distribution function, each frequency, each amplitude and each phase is calculated, including:
calculating corresponding direct current term parameters based on a preset light field intensity distribution function and each amplitude;
calculating corresponding alternating current item parameters based on a preset light field intensity distribution function, each frequency and each phase;
and calculating the corresponding light field intensity value based on the direct current term parameters and the alternating current term parameters.
Wherein the optical field intensity distribution function is:
wherein, the first and the second end of the pipe are connected with each other,
is a backward Rayleigh scattering optical signal, t is a time parameter,
is the amplitude of the back-rayleigh scattered light signal,
is the phase of the back-rayleigh scattered light signal,
is the frequency of the backscattered Rayleigh light signal.
Further, the first term in the above formula is a dc term, and the second term is an ac term containing information of optical frequency and phase.
202, the server obtains an amplitude threshold value of each position point of the optical cable, and calculates corresponding spatial domain information and time domain information based on the amplitude threshold value and the amplitude;
in this step, the spatial domain information is the number of times that each defense area of the optical cable exceeds the amplitude threshold at each moment, and the time domain information is the number of times that each defense area exceeds the amplitude threshold for a period of time.
In this embodiment, before extracting the amplitude, the method further includes generating a backward rayleigh scattering curve from the backward rayleigh scattering intensity data, and extracting coordinate values of vertical and horizontal coordinates from the curve to obtain parameters such as frequency, amplitude, phase and the like.
Under the condition of low environmental noise, a large amplitude change can be observed at the position where the disturbance occurs before and after the vibration occurs, and the amplitudes of curves at other positions where the disturbance does not occur are almost unchanged, so the disturbance can be positioned by subtracting the amplitudes of the backward rayleigh scattering curves before and after the vibration, as shown in fig. 3.
203, the server calculates frequency domain information of each position point in the optical cable based on the frequency and the amplitude of the N backward Rayleigh scattering optical signals;
after a plurality of continuous detection light pulse cycles, the change of the external vibration signal can be extracted from the signal at the corresponding vibration position in the backward Rayleigh scattering curve, and then the vibration frequency information is obtained.
204, identifying intrusion events and abnormal distribution of each defense area of the optical cable by the server based on the frequency domain information, the spatial domain information and the time domain information;
in the step, specifically, by acquiring normal frequency domain information preset at each position point, calculating a frequency domain difference value between the normal frequency domain information and the frequency domain information, and determining an intrusion event corresponding to each defense area based on the frequency domain difference value of each position point; and determining abnormal distribution of each defense area of the optical cable based on the time domain information and the time domain information.
In practical application, before identifying the intrusion event and the abnormal distribution, the method further comprises the following steps: the frequency domain information is divided into a plurality of segments, specifically, the frequency domain information is divided according to the sequence of defense regions, then each segment is compared with corresponding normal frequency domain information, whether the frequency domain of each segment is abnormal is determined based on the comparison result, if the frequency domain is abnormal, corresponding position information is determined based on the corresponding relation between the segments and the positions of the defense regions, and the defense regions are determined based on the position information.
Further, the event type actually corresponding to the frequency domain difference value is determined based on the relationship between the frequency domain difference value of the comparison result and the preset event type and the frequency domain difference threshold value, so as to determine the intrusion event, and the specific relationship between the event type and the frequency domain difference threshold value is a limit relationship of the frequency domain influence of different vibration events on the initial optical signal, which is set on the basis of the frequency domain information of the initial optical signal.
Further, for the identification of abnormal distribution, specifically, after the intrusion event exists in each defense area is identified, a plurality of detection position points in the defense area are extracted, the corresponding segments are subdivided into a plurality of small segments according to the position relationship of the detection position points, the small segments are compared with the normal frequency domain information, the abnormal detection position points are determined based on the comparison result, and the abnormal distribution of the intrusion event is determined based on the position distribution of the abnormal detection position points.
The server performs early warning based on intrusion events and anomalous distributions 205.
In this embodiment, specifically, based on the identification information of the optical cable, the defense area information of each defense area of the optical cable is queried from a database; inquiring a corresponding early warning display mode from a preset early warning display mode table based on the intrusion event of each defense area; and generating a corresponding thermodynamic diagram based on the abnormal distribution, the early warning display modes and the defense area information of the defense areas, and displaying to realize early warning.
In particular, combined with phase sensitivityThe photosensitive time domain reflection system further explains the method, and the system adopts a laser with narrow line width as a system light source, and backward Rayleigh scattered light generated by different scattering points in the light pulse range has high coherence. Continuous laser is modulated into an optical signal with a narrow pulse width (generally, a pulse width of tens of nanoseconds is adopted) and the optical signal is injected into a sensing optical fiber as probe light, so that the measuring system has high spatial resolution. The optical pulse signal is transmitted forward in the sensing fiber and generates backward Rayleigh scattered light, a plurality of Rayleigh scattered light signals are generated simultaneously within the range of the pulse width, and multi-beam interference occurs at the detector. When external vibration is loaded on the optical fiber, the optical fiber at the position where the disturbance occurs can cause the phase of a backward Rayleigh scattered light signal
Drift occurs and the intensity value of the backscattered rayleigh light changes.
Further, before acquiring the backward rayleigh scattered light signal, the method further comprises: the method comprises the steps of dividing an optical cable into a plurality of defense areas along the line, establishing a database for each defense area during route general survey, marking scenes (such as construction areas, intersections and the like) corresponding to each defense area, and enabling construction units, construction dates, responsible persons and other information to be available in the construction areas.
In practical application, the physical sensing layer is mainly responsible for acquiring directly detected backward Rayleigh scattering light intensity data; the data processing layer analyzes the continuously collected data, analyzes the phase change (characterized as the change of amplitude) of each position point, and as shown in fig. 4, manually strikes the ground near the optical fiber to make disturbance, and can locate the information such as the position, the time and the like of the vibration. By analyzing the frequency domain information, the intrusion signal and the interference signal can be further effectively distinguished, and the alarm accuracy is improved. For the vibration caused by external interference (wind, rain, small animals and the like), the most intuitive reaction in a frequency domain is that the frequency response is concentrated in a low-frequency part, and the frequency response caused by actual invasion action is concentrated in a high-frequency part, and then the invasion event can be accurately identified by combining other processing analysis.
And the logic processing layer respectively processes the data in a space domain and a time domain aiming at each defense area. Amplitude thresholds are set, which are related to the field environment of the defence area, the weather, the time, such as in downtown, rainy, daytime, the threshold will be higher, and in suburban, sunny, night, the threshold will be lower. In the spatial domain, counting the number of position points exceeding the amplitude threshold value in each defense area at each moment aiming at each defense area; in the time domain, the number of times each defense area exceeds the amplitude threshold for a period of time (e.g., one hour) is counted (statistics are included as long as the amplitude of 1 location within the defense area exceeds the threshold at a single moment).
The service display layer is used for displaying the space domain and time domain results counted by the logic processing layer in a thermodynamic diagram manner, so that the distribution condition of disturbance signals along the optical cable can be conveniently observed, and when abnormal disturbance in a defense area exceeds a threshold value, early warning is carried out; at the moment, related responsible persons can be contacted for troubleshooting through corresponding defense area information in the database, and the operation and maintenance efficiency of the optical cable is improved.
The system simultaneously supports the detection of the length of the optical fiber, and when the detection result shows that the length of the optical fiber is shortened, the system can also generate a fiber breakage alarm and give corresponding fiber breakage position information.
The system can realize simultaneous monitoring of multi-point disturbance, and has the advantages of long monitoring distance, large dynamic range, high sensitivity, high response speed, integration of sensing and less occupied resources; the sensor is intrinsic and passive, resists electromagnetic interference, and has the advantages of long-term stable operation in severe environments such as high temperature, high humidity, high corrosion and the like.
The above description is provided for the external damage prevention early warning method using the optical cable in the embodiment of the present invention, and the following description is provided for the external damage prevention early warning device using the optical cable in the embodiment of the present invention, which is mainly applied to the external damage prevention early warning apparatus, and please refer to fig. 5, where an embodiment of the external damage prevention early warning device using the optical cable in the embodiment of the present invention includes:
the acquiring module 501 is configured to acquire backward rayleigh scattered light signals returned by N continuous detection light pulse periods of an optical fiber in an optical cable, and analyze the N backward rayleigh scattered light signals to obtain N backward rayleigh scattered light intensity data;
an analyzing module 502, configured to analyze the N backward rayleigh scattering light intensity data, and determine frequency domain information, spatial domain information, and time domain information of each position point in the optical cable;
an identifying module 503, configured to identify an intrusion event and abnormal distribution of each defense area of the optical cable based on the frequency domain information, the spatial domain information, and the time domain information;
an early warning module 504, configured to perform early warning based on the intrusion event and the abnormal distribution of each defense area.
In the embodiment of the invention, backward Rayleigh scattering light intensity data of backward Rayleigh scattering light signals returned by N continuous detection light pulse periods are analyzed, frequency domain information, spatial domain information and time domain information of the optical cable are analyzed based on the backward Rayleigh scattering light intensity data, an intrusion event and abnormal distribution of each defense area of the optical cable are identified based on the frequency domain information, the spatial domain information and the time domain information, and early warning is carried out based on the intrusion event and the abnormal distribution of each defense area. Based on frequency domain information, spatial domain information and time domain information, optical signal analysis on multiple dimensions is achieved, time continuity and space continuity are achieved, and therefore the problems that in the prior art, only one or a plurality of key positions can be monitored, and continuous monitoring and early warning in a long-distance space are achieved through a digging method are solved.
Referring to fig. 6, a second embodiment of the early warning device for preventing external damage by using an optical cable according to the embodiment of the present invention includes:
the acquiring module 501 is configured to acquire backward rayleigh scattered light signals returned by N continuous detection light pulse cycles of an optical fiber in an optical cable, and analyze the N backward rayleigh scattered light signals to obtain N backward rayleigh scattered light intensity data;
an analyzing module 502, configured to analyze the N backward rayleigh scattering light intensity data, and determine frequency domain information, spatial domain information, and time domain information of each position point in the optical cable; the frequency domain information is phase change obtained by analyzing a construction function based on light intensity data from a frequency dimension, the spatial domain information is the number of times that each defense area of the optical cable exceeds an amplitude threshold at each moment, and the time domain information is the number of times that each defense area exceeds the amplitude threshold for a period of time;
an identifying module 503, configured to identify intrusion events and abnormal distributions of each defense area of the optical cable based on the frequency domain information, the spatial domain information, and the time domain information;
and an early warning module 504, configured to perform early warning based on the intrusion event and the abnormal distribution in each defense area.
In this embodiment, the obtaining module 501 includes
An extracting unit 5011, configured to extract a frequency, an amplitude, and a phase of each of the backward rayleigh scattered light signals when the N backward rayleigh scattered light intensity data are light intensity distribution data;
a first calculating unit 5012, configured to calculate a corresponding light field intensity value based on a preset light field intensity distribution function, each of the frequencies, each of the amplitudes, and each of the phases;
the determining unit 5013 is configured to determine light intensity distribution data corresponding to the N backward rayleigh scattered light signals based on each of the light field intensity values.
In this embodiment, the first computing unit 5012 is specifically configured to:
calculating corresponding direct current term parameters based on a preset light field intensity distribution function and each amplitude;
calculating corresponding alternating current item parameters based on a preset light field intensity distribution function, each frequency and each phase;
and calculating the corresponding light field intensity value based on the direct current term parameter and the alternating current term parameter.
In this embodiment, the optical field intensity distribution function is:
wherein the content of the first and second substances,
is a backward Rayleigh scattering optical signal, t is a time parameter,
is the amplitude of the back-rayleigh scattered light signal,
is the phase of the back-rayleigh scattered light signal,
is the frequency of the backscattered Rayleigh light signal.
In this embodiment, the analysis module 502 includes:
a second calculating unit 5021, configured to obtain an amplitude threshold of each position point of the optical cable, and calculate corresponding spatial domain information and time domain information based on the amplitude threshold and the amplitude;
a third calculating unit 5022, configured to calculate frequency domain information of each position point in the optical cable based on the frequencies and amplitudes of the N backward rayleigh scattered light signals.
In this embodiment, the identifying module 503 includes:
an event identifying unit 5031, configured to obtain normal frequency domain information preset at each location point, calculate a frequency domain difference between the normal frequency domain information and the frequency domain information, and determine an intrusion event corresponding to each defense area based on the frequency domain difference at each location point;
a distribution determining unit 5032, configured to determine an abnormal distribution of each defense area of the optical cable based on the time domain information and the time domain information.
In this embodiment, the early warning module 504 includes:
a query unit 5041, configured to query, from a database, defense area information of each defense area of the optical cable based on the identification information of the optical cable; inquiring a corresponding early warning display mode from a preset early warning display mode table based on the intrusion event of each defense area;
and the early warning generation unit 5042 is configured to generate a corresponding thermodynamic diagram based on the abnormal distribution and the early warning display modes and the defense area information of each defense area, and display the thermodynamic diagram to realize early warning.
On the basis of the previous embodiment, the backward rayleigh scattered light field data generated in the optical cable is directly analyzed and analyzed by using a phase-sensitive optical time domain reflectometer (Φ -OTDR) system to obtain frequency domain information, spatial domain information and time domain information, and the analysis of the optical cable on continuous space and continuous time is realized based on the information, so that the integral monitoring of the long-distance optical cable is realized, and the problems that the existing optical sensing system can only monitor one or more position points in the optical fiber and cannot realize the monitoring of long-distance continuous time and space are solved.
Fig. 5 to 6 describe the anti-external-damage early warning apparatus using an optical cable in the embodiment of the present invention in detail from the perspective of the modular functional entity, and describe the anti-external-damage early warning apparatus using an optical cable in the embodiment of the present invention in detail from the perspective of hardware processing.
Fig. 7 is a schematic structural diagram of an anti-tamper warning device 700 according to an embodiment of the present invention, where the anti-tamper warning device 700 may have a relatively large difference due to different configurations or performances, and may include one or more processors (CPUs) 710 (e.g., one or more processors) and a memory 720, one or more storage media 730 (e.g., one or more mass storage devices) for storing applications 733 or data 732. Memory 720 and storage medium 730 may be, among other things, transient storage or persistent storage. The program stored in the storage medium 730 may include one or more modules (not shown), each of which may include a series of instructions operating on the anti-vandalism warning device 700. Still further, the processor 710 may be configured to communicate with the storage medium 730, and execute a series of instruction operations in the storage medium 730 on the anti-tampering warning device 700, so as to implement the steps of the method of the above-described embodiment.
Anti-tamper early warning device 700 may also include one or more power supplies 740, one or more wired or wireless network interfaces 750, one or more input-output interfaces 760, and/or one or more operating systems 731, such as Windows Server, mac OS X, unix, linux, freeBSD, and the like. It will be understood by those skilled in the art that the configuration of the anti-tamper warning device shown in fig. 7 does not constitute a limitation of the anti-tamper warning device provided herein, and may include more or fewer components than those shown, or some components in combination, or a different arrangement of components.
The present invention also provides a computer-readable storage medium, which may be a non-volatile computer-readable storage medium, or a volatile computer-readable storage medium, wherein instructions are stored in the computer-readable storage medium, and when the instructions are executed on a computer, the instructions cause the computer to execute the steps of the anti-external damage early warning method using an optical cable.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses, and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides an outer broken early warning method of preventing of utilizing optical cable, is applied to outer broken early warning system, its characterized in that, outer broken early warning system of preventing includes phase-sensitive light time domain reflection unit and server, outer broken early warning method of preventing includes:
the phase sensitive optical time domain reflection device acquires backward Rayleigh scattered light signals returned by continuous N detection light pulse periods of an optical fiber in the optical cable, and analyzes the N backward Rayleigh scattered light signals to obtain N backward Rayleigh scattered light intensity data;
the server analyzes the N backward Rayleigh scattering light intensity data and determines frequency domain information, space domain information and time domain information of each position point in the optical cable; the frequency domain information is phase change obtained by analyzing a construction function based on light intensity data from a frequency dimension, the spatial domain information is the number of times that each defense area of the optical cable exceeds an amplitude threshold at each moment, and the time domain information is the number of times that each defense area exceeds the amplitude threshold for a period of time; identifying intrusion events and abnormal distributions of each defense area of the optical cable based on the frequency domain information, the spatial domain information and the time domain information; and early warning is carried out based on the intrusion events and the abnormal distribution of each defense area.
2. The anti-outcrop early warning method according to claim 1, wherein the N backward rayleigh scattering light intensity data are light intensity distribution data; the server analyzes the N backward Rayleigh scattering light signals to obtain N backward Rayleigh scattering light intensity data, and the method comprises the following steps:
the server extracts the frequency, amplitude and phase of each backward Rayleigh scattering optical signal;
calculating a corresponding light field intensity value based on a preset light field intensity distribution function, each frequency, each amplitude and each phase;
and determining light intensity distribution data corresponding to the N backward Rayleigh scattering light signals based on each light field intensity value.
3. The early warning method for preventing the external damage according to claim 2, wherein the calculating of the corresponding light field intensity value based on the preset light field intensity distribution function, each frequency, each amplitude and each phase comprises:
calculating corresponding direct current term parameters based on a preset light field intensity distribution function and each amplitude;
calculating corresponding alternating current item parameters based on a preset light field intensity distribution function, each frequency and each phase;
and calculating the corresponding light field intensity value based on the direct current term parameters and the alternating current term parameters.
4. The anti-outcrop early warning method according to claim 3, wherein the optical field intensity distribution function is as follows:
wherein the content of the first and second substances,
is a backward Rayleigh scattering optical signal, t is a time parameter,
is the amplitude of the back-rayleigh scattered light signal,
is the phase of the back-rayleigh scattered light signal,
is the backward Rayleigh powderThe frequency of the optical light signal.
5. The anti-outcrop early warning method according to claim 2, wherein the analyzing the N backward rayleigh scattering light intensity data to determine frequency domain information, spatial domain information and time domain information of each position point in the optical cable comprises:
acquiring an amplitude threshold value of each position point of the optical cable, and calculating corresponding spatial domain information and time domain information based on the amplitude threshold value and the amplitude;
and calculating frequency domain information of each position point in the optical cable based on the frequency and the amplitude of the N backward Rayleigh scattering optical signals.
6. The anti-breach early warning method of claim 5, wherein the identifying intrusion events and abnormal distributions for each zone of defense of the optical cable based on the frequency domain information, the spatial domain information and the time domain information comprises:
acquiring normal frequency domain information preset by each position point, calculating a frequency domain difference value between the normal frequency domain information and the frequency domain information, and determining an intrusion event corresponding to each defense area based on the frequency domain difference value of each position point;
and determining abnormal distribution of each defense area of the optical cable based on the time domain information and the time domain information.
7. The anti-breach pre-warning method according to any one of claims 1-6, wherein the pre-warning based on the intrusion event and the abnormal distribution comprises:
inquiring defense area information of each defense area of the optical cable from a database based on the identification information of the optical cable;
inquiring a corresponding early warning display mode from a preset early warning display mode table based on the intrusion event of each defense area;
and generating a corresponding thermodynamic diagram based on the abnormal distribution, the early warning display modes of the defense areas and the defense area information, and displaying to realize early warning.
8. The utility model provides an utilize outer broken early warning device of preventing of optical cable which characterized in that, outer broken early warning device of preventing includes:
the acquisition module is used for acquiring backward Rayleigh scattered light signals returned by continuous N detection light pulse periods of an optical fiber in the optical cable, and analyzing the N backward Rayleigh scattered light signals to obtain N backward Rayleigh scattered light intensity data;
the analysis module is used for analyzing the N backward Rayleigh scattering light intensity data and determining frequency domain information, space domain information and time domain information of each position point in the optical cable; the spatial domain information is the number of times that each defense area of the optical cable exceeds an amplitude threshold at each moment, and the time domain information is the number of times that each defense area exceeds the amplitude threshold for a period of time;
the identification module is used for identifying the intrusion event and abnormal distribution of each defense area of the optical cable based on the frequency domain information, the spatial domain information and the time domain information;
and the early warning module is used for early warning based on the intrusion events and the abnormal distribution of each defense area.
9. The utility model provides a prevent outer broken early warning equipment which characterized in that, prevent outer broken early warning equipment includes: a memory having instructions stored therein and at least one processor, the memory and the at least one processor interconnected by a line;
the at least one processor invokes the instructions in the memory to cause the anti-tampering pre-warning device to perform the steps of the anti-tampering pre-warning method using the optical cable according to any one of claims 1 to 7.
10. A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the anti-breach pre-warning method using optical fiber cable according to any of claims 1-7.
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