CN117146959A - Distributed optical fiber sensing monitoring device and method - Google Patents

Abstract

The application relates to a distributed optical fiber sensing monitoring device and a method, the device comprises a monitoring mechanism and a control mechanism, the monitoring mechanism comprises a temperature measuring element and at least four groups of vibration measuring elements, the temperature measuring element is arranged in a cable to be monitored and used for detecting the temperature of the cable to be monitored, the four groups of vibration measuring elements are symmetrically spirally distributed and wound on the outer surface of the cable to be monitored and used for detecting vibration deformation signals of the cable to be monitored, and the control mechanism comprises a controller, a data acquisition module, a photoelectric detection module and a laser emission module. The distributed optical fiber sensing monitoring device is high in monitoring precision, long in measuring distance, safe and reliable, capable of monitoring the running temperature and external force vibration deformation of the cable to be monitored in real time through the optical fiber sensing technology of the temperature measuring elements and at least four groups of vibration measuring elements in the monitoring mechanism, capable of rapidly positioning fault points, capable of avoiding on-site operation monitoring of operation and maintenance personnel and reducing labor intensity.

Description

Distributed optical fiber sensing monitoring device and method

Technical Field

The application relates to the technical field of power system monitoring, in particular to a distributed optical fiber sensing monitoring device and method.

Background

In recent years, in order to meet the requirements of urban construction and environment beautification, more and more power lines are constructed in a cable mode, the specific gravity of underground cables in a power transmission and distribution system is larger and larger, the scale growth is rapid, the urban underground cables play a very important role in the power transmission process, but the cables are often damaged by external forces of third parties such as manual excavation, mechanical excavation and illegal invasion in use, the types, positions and moments are difficult to predict, the operation safety and reliability of the cables are seriously influenced, and the power supply safety is seriously influenced.

Therefore, ensuring that the cable power supply is not damaged by external force and influenced by operation load becomes an urgent problem to be solved by the power operation department. However, the conventional operation and maintenance technology cannot effectively match the growth speed of the power infrastructure, so that the operation and maintenance work of the cable lines and the cable channels is under great pressure.

Disclosure of Invention

The embodiment of the application provides a distributed optical fiber sensing monitoring device and a distributed optical fiber sensing monitoring method, which are used for solving the technical problem that the existing operation and maintenance detection of a cable buried underground can only work after being damaged by external force, and power supply is affected.

In order to achieve the above object, the embodiment of the present application provides the following technical solutions:

the distributed optical fiber sensing monitoring device comprises a monitoring mechanism and a control mechanism connected with the monitoring mechanism, wherein the monitoring mechanism comprises a temperature measuring element and at least four groups of vibration measuring elements, the temperature measuring element is arranged in a cable to be monitored and used for detecting the temperature of the cable to be monitored, the four groups of vibration measuring elements are symmetrically spirally distributed and wound on the outer surface of the cable to be monitored and used for detecting vibration deformation signals of the cable to be monitored, and the control mechanism comprises a controller, a data acquisition module connected with the controller, a photoelectric detection module connected with the data acquisition module and a laser emission module connected with the photoelectric detection module;

the laser emission module is used for sending detection light to the monitoring mechanism and sending reference light to the photoelectric detection module;

the photoelectric detection module is used for collecting feedback light fed back by the detection light by the monitoring mechanism and processing the reference light and the feedback light to obtain Brillouin frequency shift data;

the data acquisition module is used for acquiring the brillouin frequency shift data of the photoelectric detection module and transmitting the brillouin frequency shift data to the controller;

and the controller is used for analyzing the Brillouin frequency shift data and determining the position of the back scattered light in the cable to be monitored.

Preferably, the photoelectric detection module comprises a fiber optic circulator for collecting feedback light of the monitoring mechanism and a coupler for processing the reference light and the feedback light.

Preferably, the control mechanism comprises an optical pulse module, an input end of the optical pulse module is connected with the laser emission module, an output end of the optical pulse module is connected with an input end of the optical fiber circulator, and the optical pulse module is used for modulating detection light output by the laser emission module into pulse light and emitting the pulse light to the monitoring mechanism.

Preferably, the control mechanism comprises a data storage module and a warning module which are connected with the controller, the data storage module is used for storing data collected by the control mechanism, the warning module is used for analyzing and feeding back abnormality detection data of the monitoring mechanism according to the control mechanism to obtain warning information, and the controller transmits the warning information to the management terminal in a wireless communication mode or a wired communication mode.

Preferably, the laser emitting module comprises a laser emitter, and the laser emitter is a tunable semiconductor laser with wavelength 1060nm and power of 150 mW.

Preferably, the outer surfaces of the temperature measuring element and the vibration measuring element are both provided with a carbon coating, and an ultraviolet curing layer is arranged on the outer surface of the carbon coating.

Preferably, the vibration measuring element is arranged in the protection tube, and the outer wall surface of the protection tube is abutted with the outer surface of the cable to be monitored.

Preferably, the protection tube is a hollow tube made of stainless steel or aluminum for accommodating the shock sensing element.

Preferably, the outer surface of waiting to monitor the cable is provided with insulating shielding layer, the surface of insulating shielding layer is provided with outer protective layer, be provided with equidistant spiral distributed's bending resistance line in the outer protective layer.

The application also provides a distributed optical fiber sensing monitoring method which is applied to the distributed optical fiber sensing monitoring device and comprises the following steps:

the laser emission module emits detection light to the monitoring mechanism and reference light to the photoelectric detection module;

the photoelectric detection module is used for collecting feedback light fed back by the monitoring mechanism according to the detection light, and processing the reference light and the feedback light to obtain Brillouin frequency shift data;

and analyzing the Brillouin frequency shift data to determine the position of the back scattered light in the cable to be monitored.

From the above technical solutions, the embodiment of the present application has the following advantages: the distributed optical fiber sensing monitoring device comprises a monitoring mechanism and a control mechanism connected with the monitoring mechanism, wherein the monitoring mechanism comprises a temperature measuring element and at least four groups of vibration measuring elements, the temperature measuring element is arranged in a cable to be monitored and used for detecting the temperature of the cable to be monitored, the four groups of vibration measuring elements are symmetrically spirally distributed and wound on the outer surface of the cable to be monitored and used for detecting vibration deformation signals of the cable to be monitored, and the control mechanism comprises a controller, a data acquisition module connected with the controller, a photoelectric detection module connected with the data acquisition module and a laser emission module connected with the photoelectric detection module. The distributed optical fiber sensing monitoring device is high in monitoring precision, long in measuring distance, safe and reliable, monitors the running temperature and external force vibration deformation of a cable to be monitored in real time through the optical fiber sensing technology of the temperature measuring element and at least four groups of vibration measuring elements in the monitoring mechanism, and rapidly locates fault points, so that the on-site operation and monitoring of operation and maintenance personnel are avoided, the labor intensity is reduced, and the technical problem that the operation and maintenance detection of the cable buried underground in the prior art can only work after the external force damage is adopted to influence the power supply is solved.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic diagram of a monitoring mechanism in a distributed optical fiber sensing monitoring device according to an embodiment of the present application;

FIG. 2 is a block diagram of a control mechanism in a distributed optical fiber sensing monitoring device according to an embodiment of the present application;

FIG. 3 is a block diagram of a control mechanism in a distributed optical fiber sensing monitoring device according to another embodiment of the present application;

FIG. 4 is a block diagram of a control mechanism in a distributed fiber optic sensing monitoring device according to yet another embodiment of the present application;

FIG. 5 is a block diagram of a control mechanism in a distributed fiber optic sensing monitoring device according to yet another embodiment of the present application;

FIG. 6 is a schematic diagram of a monitoring mechanism in a distributed optical fiber sensing monitoring device according to another embodiment of the present application;

fig. 7 is a schematic structural diagram of a monitoring mechanism in a distributed optical fiber sensing monitoring device according to another embodiment of the present application.

Detailed Description

In order to make the objects, features and advantages of the present application more comprehensible, the technical solutions in the embodiments of the present application are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to fall within the scope of the present application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The embodiment of the application provides a distributed optical fiber sensing monitoring device and a distributed optical fiber sensing monitoring method, which are used for solving the technical problem that the existing operation and maintenance detection of a cable buried underground can only work after being damaged by external force, and power supply is affected.

Embodiment one:

fig. 1 is a schematic structural diagram of a monitoring mechanism in a distributed optical fiber sensing monitoring device according to an embodiment of the present application, and fig. 2 is a frame diagram of a control mechanism in a distributed optical fiber sensing monitoring device according to an embodiment of the present application.

As shown in fig. 1 and 2, an embodiment of the present application provides a distributed optical fiber sensing monitoring device, which includes a monitoring mechanism 100 and a control mechanism 200 connected to the monitoring mechanism 100, wherein the monitoring mechanism 100 includes a temperature measuring element 1021 and at least four groups of vibration measuring elements 1022, the temperature measuring element 1021 is disposed inside a cable 101 to be monitored and is used for detecting the temperature of the cable 101 to be monitored, the four groups of vibration measuring elements 1022 are symmetrically spirally distributed and wound on the outer surface of the cable 101 to be monitored and are used for detecting vibration deformation signals of the cable 101 to be monitored, and the control mechanism 200 includes a controller 201, a data acquisition module 205 connected to the controller 201, a photoelectric detection module 204 connected to the data acquisition module 205, and a laser emission module 202 connected to the photoelectric detection module 204.

In the embodiment of the present application, the temperature measuring element 1021 and the vibration measuring element 1022 are laid following the cable 101 to be monitored.

It should be noted that, the temperature measuring element 1021 and the vibration measuring element 1022 have similar optical fibers, and different parameters are monitored by setting different optical fibers, so as to avoid the influence of mutual interference, and collect the operating temperature and vibration deformation signals of the cable 101 to be monitored, so that the stable operation of the power system is ensured. In this embodiment, the temperature measuring element 1021 is disposed inside the cable 101 to be monitored, the cable 101 to be monitored detects the temperature thereof, the dialectical response is fast, and the detected temperature data is accurate. The monitoring mechanism 100 is symmetrically spirally distributed and wound on the outer surface of the cable 101 to be monitored through four groups of vibration measuring elements 1022, so that the change condition of each section of the cable 101 to be monitored can be monitored, and the vibration deformation direction of the cable 101 to be monitored can be judged through different signals of the four groups of vibration measuring elements 1022, so that the fault cause can be conveniently judged. When one or more groups of vibration sensing elements 1022 are different from other groups or groups of detected vibration deformation signals, the deformation of the cable 101 to be monitored is represented, and the deformation direction is judged by the positive and negative of the difference value; for example, if the difference value is positive, it indicates that the deformation direction is the same as the direction in which the vibration measuring element 1022 is wound around the cable 101 to be monitored; if the difference is negative, it indicates that the deformation direction is opposite to the direction in which the vibration sensing element 1022 is wound around the cable 101 to be monitored.

In the embodiment of the present application, the control mechanism 200 may be used to emit laser, the monitoring mechanism 100 reflects the feedback light back to the control mechanism 200 according to the laser, and the control mechanism 200 performs processing analysis according to the feedback light and the corresponding laser, so as to obtain a result of monitoring the cable 101 to be monitored.

In an embodiment of the present application, the laser emitting module 202 may be used to send detection light to the monitoring mechanism 100 and reference light to the photo detection module 204.

It should be noted that, the laser emitting module 202 may be configured to emit laser light, and the detection light and the reference light are both laser light. In this embodiment, the laser emitting module 202 may be a laser emitter, the laser sources emitted by the laser emitting module 202 are sent in two groups, one beam of emitted detection light is sent to the monitoring mechanism 100, and the temperature measuring element 1021 and each group of vibration measuring elements 1022 in the monitoring mechanism 100 reflect feedback light back to the control mechanism 200 according to the detection light, where the feedback light is received by the photoelectric detection module 204; the other laser source of the reference beam is sent to the photodetection module 204 and received. The laser sources of the two paths emitted by the laser emitting module 202 are identical, the laser emitters preferably adopt narrow-line-width high-power adjustable semiconductor lasers, the wavelength 1060nm and the power are 150mW, and the Brillouin scattering efficiency and the measurement accuracy in the temperature measuring element 1021 and the vibration measuring elements 1022 in each group are ensured.

In the embodiment of the present application, the photoelectric detection module 204 may be configured to collect feedback light fed back by the detection mechanism 100 and process the reference light and the feedback light to obtain brillouin frequency shift data.

The photodetection module 204 may heterodyne-detect the reference light and the detected light, and output brillouin shift data, or may output brillouin shift signals. Most of the light waves propagated by the optical fiber propagate forward, but a small portion of the light is scattered due to the non-uniform structure of the amorphous material of the optical fiber in the microscopic space. The scattering process in optical fibers is mainly three: rayleigh scattering, raman scattering and Brillouin scattering differ in their scattering mechanisms. The brillouin scattering is a light scattering process generated by interaction of light waves and sound waves in an optical fiber, and is respectively shown in two forms of spontaneous scattering and stimulated scattering under different conditions. At low injected light powers, the brownian motion of the molecules of the fiber material will produce acoustic noise, which when propagated in the fiber will cause a change in the refractive index of the fiber material by the pressure difference, thereby producing spontaneous scattering effects on the transmitted light, while the propagation of the acoustic wave in the material will cause the pressure difference and refractive index change to be periodic, resulting in a doppler shift of the scattered light frequency relative to the transmitted light, which scattering is known as spontaneous brillouin scattering. Therefore, the detection light emitted from the laser emitting module 202 in the present embodiment propagates through the brillouin scattering in the monitoring mechanism 101, and the feedback light is received by the photodetection module 204. Because the temperature measuring element 1021 and each group of vibration measuring elements 1022 in the monitoring mechanism 101 are made of optical fibers, deformation and high temperature of the temperature measuring element 1021 and each group of vibration measuring elements 1022 can influence propagation of detection light, so that a brillouin frequency shift signal changes, the brillouin frequency shift data outputted by the photoelectric detection module 204 calculate the periodic length and the periodic number of refraction changes of the brillouin frequency shift data (signal) in the controller, and the position of back scattered light in feedback light is obtained, so that the position of a fault of the cable 101 to be monitored can be judged, and the fault position of the cable 101 to be monitored can be rapidly positioned.

In an embodiment of the present application, the data acquisition module 205 may be configured to acquire brillouin shift data of the photodetection module 204 and transmit the brillouin shift data to the controller 201.

It should be noted that, the data acquisition module 205 may be a data acquisition device. In the present embodiment, the data acquisition module 205 simply transmits the brillouin shift data outputted from the photodetection module 204 to the controller 201

In an embodiment of the present application, the controller 201 may be configured to analyze the brillouin shift data to determine the position of the backscattered light in the cable 101 to be monitored.

In the embodiment of the present application, the controller 201 determines the position of the back scattered light of the detection light in the cable 101 to be monitored according to the length and the period number of the refraction change period of the feedback light analyzed from the brillouin frequency shift data, so that the position of the fault of the cable 101 to be monitored can be correctly determined.

The application provides a distributed optical fiber sensing monitoring device which comprises a monitoring mechanism and a control mechanism connected with the monitoring mechanism, wherein the monitoring mechanism comprises a temperature measuring element and at least four groups of vibration measuring elements, the temperature measuring element is arranged in a cable to be monitored and used for detecting the temperature of the cable to be monitored, the four groups of vibration measuring elements are symmetrically spirally distributed and wound on the outer surface of the cable to be monitored and used for detecting vibration deformation signals of the cable to be monitored, and the control mechanism comprises a controller, a data acquisition module connected with the controller, a photoelectric detection module connected with the data acquisition module and a laser emission module connected with the photoelectric detection module. The distributed optical fiber sensing monitoring device is high in monitoring precision, long in measuring distance, safe and reliable, monitors the running temperature and external force vibration deformation of a cable to be monitored in real time through the optical fiber sensing technology of the temperature measuring element and at least four groups of vibration measuring elements in the monitoring mechanism, and rapidly locates fault points, so that the on-site operation and monitoring of operation and maintenance personnel are avoided, the labor intensity is reduced, and the technical problem that the operation and maintenance detection of the cable buried underground in the prior art can only work after the external force damage is adopted to influence the power supply is solved.

Fig. 3 is a block diagram of a control mechanism in a distributed optical fiber sensing monitoring device according to another embodiment of the present application.

As shown in fig. 3, in one embodiment of the application, the photo detection module 204 includes a fiber optic circulator 2042 for collecting feedback light from the monitoring mechanism 100 and a coupler 2041 for processing the reference light and the feedback light.

It should be noted that, the output end of the photoelectric detection module 204 is electrically connected to the input end of the data acquisition module 205, the front end of the photoelectric detection module 204 is provided with a coupler 2041 and an optical fiber circulator 2042, and the optical fiber circulator 2042 is disposed at the input end of the monitoring mechanism 100. In this embodiment, the optical fiber circulator 2042 employs three ports for bidirectional optical signal transmission on the monitoring mechanism 100, the signal transmission direction on the optical fiber circulator 2042 is irreversible, and the optical signals need to pass through the ports sequentially along one direction, so as to ensure that the signal transmission loss is the lowest. The reference optical signal of the laser emission module 202 and the loop optical signal of the monitoring mechanism 100 are both connected to the input end of the coupler 2041, and the output end of the coupler 2041 is connected to the input end of the photodetection module 204.

Fig. 4 is a block diagram of a control mechanism in a distributed optical fiber sensing monitoring device according to another embodiment of the present application.

As shown in fig. 4, in the embodiment of the present application, the control mechanism 200 includes an optical pulse module 203, an input end of the optical pulse module 23 is connected to the laser emitting module 202, an output end of the optical pulse module 203 is connected to an input end of the optical fiber circulator 2042, and the optical pulse module 203 is configured to modulate the detection light output by the laser emitting module 202 into pulsed light and emit the pulsed light to the monitoring mechanism 100.

The output end of the optical pulse module 203 is connected to the optical fiber circulator 2042, the optical pulse module 203 includes a modulator 2031 and an amplifier 2032, and the modulator 2031 is sequentially connected to the amplifier 2032, and is configured to modulate an optical signal of the detection light sent by the laser emission module 202 into a pulse light of a pulse signal, and amplify and match working signals of the temperature measurement element 1021 and the vibration measurement element 1022 in the monitoring mechanism 100.

Fig. 5 is a block diagram of a control mechanism in a distributed optical fiber sensing monitoring device according to another embodiment of the present application.

As shown in fig. 5, in one embodiment of the present application, the control mechanism 200 includes a data storage module 2061 and a warning module 2012 connected to the controller 201, the data storage module 201 is configured to store data collected by the control mechanism 200, the warning module 2012 is configured to analyze the abnormality detection data of the feedback monitoring mechanism 100 according to the control mechanism 200 to obtain alarm information, and the controller 201 transmits the alarm information to the management terminal 2011 through a wireless communication manner or a wired communication manner. Wherein the data storage module 2061 is disposed in the signal processor 206.

It should be noted that, the output end of the data acquisition module 205 is electrically connected to the input end of the signal processor 206, the output end of the signal processor 206 is electrically connected to the controller 201, the data acquisition module 205 collects the signals output by the photoelectric detection module 204, and transmits the signals to the signal processor 206 for storage and processing, so as to complete the curve measurement of the detection information. In this embodiment, the output end of the signal processor 206 is connected with a data storage module 2061, the data storage module 2061 is in communication connection with the controller 201, the data storage module 2061 is used for storing detection data of the monitoring mechanism 100, and is convenient for the controller 201 to retrieve and view at any time, the data storage module 2061 can store detection information within one year, and the loss and the accuracy of the cable 101 to be monitored can be conveniently judged. Under the condition that the cable 101 to be monitored does not generate vibration deformation or high-temperature faults, the loss condition of the cable 101 to be monitored is obtained through the comparison difference value between the initial detection data and the current detection data.

In the embodiment of the present application, the controller 201 is communicatively connected with the management terminal 2011, where the management terminal 2011 may be a PC, a mobile phone or a tablet computer, and has a wide application form and convenient use. The controller 201 is provided with a warning module 2012 for feeding back an abnormal monitoring result, and the controller 201 is used for sending warning information to the management terminal 2011, so that personnel management is facilitated, and the warning information comprises detection data, exceeding early warning value, fault location, fault range and the like. The detection data comprise the fault position, deformation amplitude, temperature and the like of the electric wire.

Fig. 6 is a schematic structural diagram of a monitoring mechanism in a distributed optical fiber sensing monitoring device according to another embodiment of the present application, and fig. 7 is a schematic structural diagram of a monitoring mechanism in a distributed optical fiber sensing monitoring device according to another embodiment of the present application.

As shown in fig. 6, in one embodiment of the present application, the outer surfaces of the temperature sensing element 1021 and the vibration sensing element 1022 are each provided with a carbon coating 1023, and the outer surface of the carbon coating 1023 is provided with an ultraviolet curing layer 1024.

It should be noted that, the outer surfaces of the temperature measuring element 1021 and the vibration measuring element 1022 can play a role in isolating and protecting the optical fibers inside the temperature measuring element 1021 and the vibration measuring element 1022 and play a role in prolonging the service life of the optical fibers through the carbon coating 1023 and the ultraviolet curing layer 1024.

As shown in fig. 6, in an embodiment of the present application, an insulating shielding layer 1011 is disposed on an outer surface of a cable 101 to be monitored, an outer protection layer 1012 is disposed on an outer surface of the insulating shielding layer 1011, and anti-bending wires 1013 distributed in equal-distance spiral are disposed in the outer protection layer 1012.

It should be noted that, the anti-bending wire 1013 is preferably made of a metal material, and is equidistantly and spirally distributed in the first outer protective layer 1012, and the anti-bending wire 1013 is used for enhancing the strength of the cable 101 to be monitored and preventing the influence on the internal temperature measuring element 1021 when the outer protective layer 1012 is bound.

As shown in fig. 7, in one embodiment of the present application, the vibration measuring element 1022 is disposed inside the protection tube 1025, and an outer wall surface of the protection tube 1025 abuts against an outer surface of the cable 101 to be monitored. The protection tube 1025 is a hollow tube made of stainless steel or aluminum for accommodating the vibration measuring element.

It should be noted that, the outer surface of the protection tube 1025 and the outer protection layer 1012 is fixed by one of adhesive, clamping and/or binding, and the protection tube 1025 prevents the vibration sensing element 1022 from being damaged due to bending caused by external force, and also facilitates replacement of the monitoring mechanism 100.

In the embodiment of the application, the distributed optical fiber sensing monitoring device enhances the strength of the optical fiber by the plating material of the outer ring of the monitoring mechanism 100, has strong corrosion resistance and high-temperature and high-pressure resistance, and in the production binding process of the cable 101 to be monitored, the anti-bending wire 1013 is arranged in the outer protective layer 1012, so that the central temperature measuring element 1021 is effectively protected, high-temperature extrusion and bending deformation are prevented, the vibration measuring element 1022 on the outer surface of the cable 101 to be monitored is coated with the protective tube 1025, and the influence of external force on the vibration measuring element 1022 when the cable 101 to be monitored is paved and installed is prevented, so that the monitoring mechanism 100 is simple in arrangement, firm in structure, high in strength and long in service life.

Embodiment two:

the embodiment of the application also provides a distributed optical fiber sensing monitoring method which is applied to the distributed optical fiber sensing monitoring device and comprises the following steps of:

the laser emission module emits detection light to the monitoring mechanism and reference light to the photoelectric detection module;

the photoelectric detection module is used for collecting feedback light fed back by the monitoring mechanism according to the detection light, and processing the reference light and the feedback light to obtain Brillouin frequency shift data;

and analyzing the Brillouin frequency shift data to determine the position of the back scattered light in the cable to be monitored.

It should be noted that, in the second method of the embodiment, the content of the distributed optical fiber sensing monitoring device is described in detail in the first embodiment, and in this second embodiment, the content of the distributed optical fiber sensing monitoring device is not described in detail.

In the embodiment of the application, when the cable 101 to be monitored is bound to the outer protective layer 1012, the temperature measuring element 1021 is arranged in the center of the cable 101 to be monitored, the four groups of vibration measuring elements 1022 are sleeved with the protective tube 1025 and then are attached to the outer surface of the outer protective layer 1012 in a spiral gluing mode, and the bound cable 101 to be monitored is paved in a trench well according to a construction drawing; then according to the distributed optical fiber sensing monitoring device, the monitoring mechanism 100 and the control mechanism 200 are led out, the monitoring mechanism 100 is connected with the control mechanism 200, the power supply is connected, the photoelectric detection module 204 receives detection data of the monitoring mechanism 100, and debugging of the distributed optical fiber sensing monitoring device is completed; when the distributed optical fiber sensing monitoring device starts to work, the laser emission module 202 emits two paths of light sources simultaneously, one path of detection light is modulated Cheng Maichong light through the modulator 2031 and the amplifier 2032 and is transmitted into the monitoring mechanism 100 through a specific port of the optical fiber circulator 2042 after signal amplification, the other path of detection light is directly injected into the photoelectric detection module 204 through the coupler 2041 as reference light, the detection light entering the monitoring mechanism 100 monitors the temperature and vibration deformation of the cable 101 to be monitored by utilizing the brillouin scattering light effect, and meanwhile, the position of the brillouin backscattering light in the optical fiber is calculated by the time when the detection light signal is detected by the photoelectric detection module 204, so that the fault point of high temperature and vibration is rapidly located. The data acquisition module 205 collects the detection signals of the photoelectric detection module 204 and transmits the detection signals to the signal processor 206, the signal processor 206 converts the signal data into a matching format and transmits the matching format to the controller 201, the controller 201 compares and sets the monitoring early warning parameters and then sends a curve change chart to the management terminal 2011 for display, and when the monitoring data comparison exceeds the early warning range, the warning module 2012 is started and sends warning information to the management terminal 2011 through the controller 201 so as to prompt the manager to overhaul and check. The photoelectric detection module 204 determines whether a fault occurs by calculating the time of detecting the detected light, and then calculates the distance from the emitting end of the detected light by calculating the frequency shift signal change generated by the brillouin scattering effect to obtain the position of the fault point.

It should be noted that, the distributed optical fiber sensing monitoring method is based on the brillouin scattering principle, the monitoring mechanism 100 is used for collecting the running temperature and vibration deformation of the cable 101 to be monitored, the monitoring mechanism 100 is wound around the center and the outer surface of the cable 101 to be monitored and is laid, long-distance monitoring of the cable 101 to be monitored is achieved, real-time monitoring and rapid fault point positioning are achieved by using the brillouin distributed optical fiber sensing technology, and the monitoring and early warning prompt are achieved through the connection of the controller 201 to the management terminal 2011.

It should be noted that the processor is configured to execute the steps in the embodiment of the distributed optical fiber sensing monitoring device according to the instructions in the program code. In the alternative, the processor, when executing the computer program, performs the functions of the modules/units in the system/apparatus embodiments described above.

For example, a computer program may be split into one or more modules/units, which are stored in a memory and executed by a processor to perform the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the terminal device.

The terminal device may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The terminal device may include, but is not limited to, a processor, a memory. It will be appreciated by those skilled in the art that the terminal device is not limited and may include more or less components than those illustrated, or may be combined with certain components, or different components, e.g., the terminal device may also include input and output devices, network access devices, buses, etc.

The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory may be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk provided on the terminal device, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like. Further, the memory may also include both an internal storage unit of the terminal device and an external storage device. The memory is used for storing computer programs and other programs and data required by the terminal device. The memory may also be used to temporarily store data that has been output or is to be output.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.

In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. The distributed optical fiber sensing monitoring device comprises a monitoring mechanism and a control mechanism connected with the monitoring mechanism, and is characterized in that the monitoring mechanism comprises a temperature measuring element and at least four groups of vibration measuring elements, the temperature measuring element is arranged in a cable to be monitored and used for detecting the temperature of the cable to be monitored, the four groups of vibration measuring elements are symmetrically spirally distributed and wound on the outer surface of the cable to be monitored and used for detecting vibration deformation signals of the cable to be monitored, and the control mechanism comprises a controller, a data acquisition module connected with the controller, a photoelectric detection module connected with the data acquisition module and a laser emission module connected with the photoelectric detection module;

the laser emission module is used for sending detection light to the monitoring mechanism and sending reference light to the photoelectric detection module;

the photoelectric detection module is used for collecting feedback light fed back by the detection light by the monitoring mechanism and processing the reference light and the feedback light to obtain Brillouin frequency shift data;

the data acquisition module is used for acquiring the brillouin frequency shift data of the photoelectric detection module and transmitting the brillouin frequency shift data to the controller;

and the controller is used for analyzing the Brillouin frequency shift data and determining the position of the back scattered light in the cable to be monitored.

2. The distributed optical fiber sensing monitoring device of claim 1, wherein the photo detection module comprises a fiber optic circulator for collecting feedback light from the monitoring mechanism and a coupler for processing the reference light and the feedback light.

3. The distributed optical fiber sensing monitoring device according to claim 2, wherein the control mechanism comprises an optical pulse module, an input end of the optical pulse module is connected with the laser emitting module, an output end of the optical pulse module is connected with an input end of the optical fiber circulator, and the optical pulse module is used for modulating detection light output by the laser emitting module into pulse light to be emitted to the monitoring mechanism.

4. The distributed optical fiber sensing monitoring device according to claim 3, wherein the control mechanism comprises a data storage module and a warning module, wherein the data storage module is connected with the controller, the data storage module is used for storing data collected by the control mechanism, the warning module is used for analyzing and feeding back abnormal detection data of the monitoring mechanism according to the control mechanism to obtain warning information, and the controller transmits the warning information to the management terminal in a wireless communication mode or a wired communication mode.

5. The distributed fiber optic sensing monitoring device of claim 1, wherein the laser emitting module comprises a laser emitter that is a tunable semiconductor laser of wavelength 1060nm and power 150 mW.

6. The distributed optical fiber sensing monitoring device of claim 1, wherein the outer surfaces of the temperature measuring element and the vibration measuring element are both provided with a carbon coating, and an ultraviolet curing layer is arranged on the outer surface of the carbon coating.

7. The distributed optical fiber sensing monitoring device according to claim 1, wherein the vibration measuring element is arranged in a protection tube, and the outer wall surface of the protection tube is abutted with the outer surface of the cable to be monitored.

8. The distributed fiber optic sensor monitoring device of claim 7, wherein the protective tube is a hollow tube made of stainless steel or aluminum that houses the shock sensing element.

9. The distributed optical fiber sensing monitoring device according to claim 1, wherein an insulating shielding layer is arranged on the outer surface of the cable to be monitored, an outer protection layer is arranged on the outer surface of the insulating shielding layer, and anti-bending lines distributed in an equidistant spiral mode are arranged in the outer protection layer.

10. A distributed optical fiber sensing monitoring method applied to the distributed optical fiber sensing monitoring device as defined in any one of claims 1 to 9, comprising the following steps:

the laser emission module emits detection light to the monitoring mechanism and reference light to the photoelectric detection module;

the photoelectric detection module is used for collecting feedback light fed back by the monitoring mechanism according to the detection light, and processing the reference light and the feedback light to obtain Brillouin frequency shift data;

and analyzing the Brillouin frequency shift data to determine the position of the back scattered light in the cable to be monitored.