CN114877986A - External damage prevention monitoring and early warning system based on distributed optical fiber vibration sensing technology - Google Patents
External damage prevention monitoring and early warning system based on distributed optical fiber vibration sensing technology Download PDFInfo
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- CN114877986A CN114877986A CN202210609837.0A CN202210609837A CN114877986A CN 114877986 A CN114877986 A CN 114877986A CN 202210609837 A CN202210609837 A CN 202210609837A CN 114877986 A CN114877986 A CN 114877986A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
- G01H9/006—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors the vibrations causing a variation in the relative position of the end of a fibre and another element
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/46—Indirect determination of position data
- G01S17/48—Active triangulation systems, i.e. using the transmission and reflection of electromagnetic waves other than radio waves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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Abstract
The invention provides an anti-external-damage monitoring and early-warning system based on a distributed optical fiber vibration sensing technology, which comprises a signal transmitter, an isolation device, a detection optical cable, a signal receiver and an upper computer, wherein the signal transmitter, the detection optical cable and the signal receiver are respectively connected with the isolation device, the signal receiver is in signal connection with the upper computer, the signal transmitter is used for inputting pulse light signals to the detection optical cable through the isolation device, the detection optical cable is arranged in a cable channel or is paved beside a buried cable in an accompanying manner, the signal receiver is used for receiving light intensity signals output by the detection optical cable through the isolation device, converting the light intensity signals into current signals and processing the current signals to obtain vibration signals, the upper computer is used for analyzing and positioning the vibration signals and determining the projection position and the longitudinal distance of a vibration source on the detection optical cable, the system can more accurately position the relative position between the vibration source and the detection optical cable by sending early warning information to the mobile terminal.
Description
Technical Field
The invention relates to the technical field of cable external damage prevention monitoring and early warning, in particular to an external damage prevention monitoring and early warning system based on a distributed optical fiber vibration sensing technology.
Background
In the power system, the operation quality of the cable has very important influence on the overall operation quality of the power system, in the process of operation of the power cable, the protection against external force damage is very important management work content, many power cables are laid in cable ducts under the ground, the situation that constructors carelessly damage the power cables buried underground in the engineering construction process can often occur, the stable operation of the power system can be influenced, the loss is caused to power enterprises, the power supply stability can be influenced, and therefore the normal domestic power consumption of surrounding residents is influenced, and therefore, the external damage prevention monitoring and early warning system for the power cable is very necessary to establish. The distributed optical fiber vibration sensing technology has the advantages of long distance, high precision and distributed measurement, and can provide the condition that the vibration on the whole optical fiber link changes along with time.
Disclosure of Invention
In view of the above, the present invention provides an anti-vandalism monitoring and early warning system based on distributed optical fiber vibration sensing technology, so as to overcome or at least partially solve the above problems in the prior art.
The technical scheme adopted by the invention is as follows:
an anti-external-damage monitoring and early-warning system based on a distributed optical fiber vibration sensing technology comprises a signal transmitter, an isolation device, a detection optical cable, a signal receiver and an upper computer, the signal transmitter, the detection optical cable and the signal receiver are respectively connected with the isolation device, the signal receiver is connected with the upper computer through signals, the signal emitter is used for inputting the pulse light signals to a detection optical cable through an isolation device, the detection optical cable is arranged in a cable channel or is paved beside a buried cable in an accompanying way, the signal receiver is used for receiving the light intensity signal output by the detection optical cable through the isolation device, converting the light intensity signal into a current signal, the current signal is processed to obtain a vibration signal, the upper computer is used for analyzing and positioning the vibration signal, determining the projection position and the longitudinal distance of the vibration source on the detection optical cable, and sending early warning information to the mobile terminal.
Further, the signal emitter comprises a signal generator, an optical pulse generator, a modulator, an amplifier and a filter, the optical pulse generator emits continuous optical pulses to the modulator through optical fibers, the signal generator sends electric signals to the modulator through electric wires, the modulator is used for modulating the continuous optical pulses and the electric signals, the input end of the amplifier is connected with the modulator through the optical fibers, the output end of the amplifier is connected with the filter and used for amplifying the pulse optical signals output by the modulator, and the filter is used for filtering useless optical signals in the amplified pulse optical signals and inputting the filtered pulse optical signals into the isolation device through the optical fibers.
Further, signal receiver includes photoelectric detector, operational amplifier circuit and data acquisition card, photoelectric detector, operational amplifier circuit and data acquisition card loop through the circuit and are connected, data acquisition card links to each other with the host computer signal, photoelectric detector's input is connected with isolation equipment for detect the light intensity signal of coherent backward rayleigh scattered light in the detection optical cable, and convert current signal into, the operational amplifier circuit is used for enlargiing the current signal of photoelectric detector output and sends data acquisition card to carry out data processing.
Further, the upper computer includes:
the demodulation module is used for virtualizing the multi-section detection optical cable into a long string of vibration sensing units which are independently distributed, and demodulating corresponding receiving time and intensity signals according to the vibration signals received by each vibration sensing unit;
the first positioning module is used for determining the projection position of the vibration source on the detection optical cable based on the receiving time and the intensity signal obtained by demodulation;
the second positioning module is used for determining the longitudinal distance between the vibration source and the detection optical cable based on the vibration amplitude of the multi-section detection optical cable;
and the early warning module is used for receiving the position of the detection optical cable of the vibration signal, the projection position of the vibration source on the detection optical cable and the longitudinal distance between the vibration source and the detection optical cable, generating corresponding early warning information and distributing the early warning information to a plurality of mobile terminals appointed by users.
Further, the first positioning module is specifically configured to, when receiving a vibration signal, determine all vibration sensing units receiving the vibration signal at the same time point according to the demodulated receiving time, calculate a time difference value at which the vibration signal reaches each vibration sensing unit, calculate a distance difference value at which the vibration source reaches each vibration sensing unit according to the time difference value, form a hyperbola with the vibration sensing units as focuses and the distance difference value as major axes, and determine a projection position of the vibration source on the detection optical cable according to an intersection point of different hyperbolas.
Further, the second locating module is specifically configured to, when receiving the vibration signal, search for a point on the detection cable with the highest vibration amplitude, define the point with the highest vibration amplitude as the first sensor point S1, define the farthest point of the detection cable vibration caused by the vibration source as the second sensor point S2 with a distance d from S1, analyze the vibration waveforms of S1 and S2, obtain a time difference Δ t when the vibration signal reaches S1 and S2, obtain a propagation velocity of the vibration signal in the soil where the detection cable is located as V, and obtain a vibration propagation right triangle consisting of the propagation time and the vibration velocity:
(Vt 1 ) 2 +d 2 ＝(Vt 2 ) 2
wherein t is 1 Indicating the time, t, at which the vibration signal reaches S1 2 Representing the time when the vibration signal reaches S2, d is the distance between S1 and S2, t 2 ＝t 1 + Δ t, it can thus be obtained that the lateral distance y between the detection cable and the vibration source is:
further, the system further comprises a knocking testing device, the knocking testing device comprises a shell, a control main board, a communication module and a positioning module are arranged in the shell, an automatic knocking mechanism and a traveling mechanism are arranged on the bottom of the shell, the control main board is connected with the communication module and the positioning module respectively through signals, the communication module is used for achieving data interaction between the control main board and an upper computer, the automatic knocking mechanism is used for knocking the ground of a laying area of the detection optical cable, and the traveling mechanism is used for driving the shell to move.
Further, automatic knocking mechanism includes the bottom subassembly of strikeing, the bottom subassembly of strikeing is including setting up in the cavity of casing bottom, be equipped with the baffle in the cavity, the bar hole has been seted up on the baffle, and the baffle top is provided with the rotary drum, rotary drum one end is connected with the cavity lateral wall through the torsional spring, and the rotary drum other end is equipped with spacing hole, and the other push pedal that is provided with of rotary drum, push pedal one side is equipped with driving motor, be equipped with the spacing portion in the spacing hole of shape adaptation on driving motor's the output shaft, the push pedal opposite side is provided with first push rod motor, the push rod of first push rod motor is connected with the push pedal, and the baffle below is provided with first portion of strikeing, first portion of strikeing is connected with the baffle through first spring, and it has the haulage rope to coil on the rotary drum, the tip of haulage rope passes the bar hole and is connected with first portion of strikeing.
Further, automatic strike mechanism includes the side and strikes the subassembly, the side strikes the subassembly including the cover and establishes the annular electric guide rail in the casing side, it is provided with the slider to slide on the annular electric guide rail, be provided with the barrel on the slider, it is provided with the second portion of strikeing to slide in the barrel, the second portion of strikeing is connected with the barrel tip through the second spring, and the top and the bottom of second portion of strikeing are all arranged and are provided with a plurality of first magnets, and the spout has all been seted up to the upper wall and the lower wall of barrel, it is provided with second magnet to arrange in the spout, in first magnet inserts the spout, first magnet is the same with the magnetic pole array orientation of second magnet, and second portion of strikeing one end is equipped with cyclic annular portion, barrel one end is provided with second push rod motor, the push rod tip of second push rod motor is equipped with electronic holder.
Furthermore, running gear includes driving motor and walking wheel, driving motor's output shaft is connected with the walking wheel, and driving motor is connected with the control mainboard through control circuit.
Compared with the prior art, the invention has the beneficial effects that:
according to the anti-external-damage monitoring and early warning system based on the distributed optical fiber vibration sensing technology, the pulse light signals are input to the detection optical cable through the isolation device through the signal transmitter, the light intensity signals output by the detection optical cable are received by the signal receiver through the isolation device, when vibration occurs around the detection optical cable, the light intensity signals can be processed into corresponding vibration signals by the signal receiver, the vibration signals are analyzed and positioned by the upper computer, and the projection position and the longitudinal distance of the vibration source on the detection optical cable are determined, so that workers can be helped to determine the relative position between the vibration source and the detection optical cable, and can be checked in time, the cable is prevented from being damaged by external force, and the operation stability of the power cable is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only preferred embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive efforts.
Fig. 1 is a schematic view of an overall structure of an external damage prevention monitoring and early warning system based on a distributed optical fiber vibration sensing technology according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a function module of a host computer according to an embodiment of the present invention.
Fig. 3 is a schematic cross-sectional structure view of a knocking test device according to an embodiment of the present invention.
FIG. 4 is a schematic circuit diagram of a tap testing apparatus according to an embodiment of the present invention.
Fig. 5 is an enlarged schematic view of a portion a of fig. 3.
In the figure, 1 a signal transmitter, 101 a signal generator, 102 a light pulse generator, 103 a modulator, 104 an amplifier, 105 a filter, 2 an isolation device, 3 a detection optical cable, 4 a signal receiver, 401 a photoelectric detector, 402 an amplifier circuit, 403 a data acquisition card, 5 a host computer, 501 a demodulation module, 502 a first positioning module, 503 a second positioning module, 504 an early warning module, 6 a shell, 7 a control mainboard, 8 a communication module, 9 a positioning module, 10 a bottom knocking component, 1001 a cavity, 1002 a clapboard, 1003 a strip hole, 1004 a drum, 1005, 1006 a push plate, 1007 driving motors, 1008 a limiting part, 1009 a first push rod motor, 1010 a first knocking part, 1011 a first spring, 1012 a pulling rope, 11 a side knocking component, 1101 an annular electric guide rail, 1102 a slider, 1103 a cylinder, 1105 a second knocking part, 1106 a chute, 1107 a second magnet, 1108 an annular part, 1109 a second push rod motor, 1110 electric gripper, 1111 second spring, 12 road wheels and 13 driving motor.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, the illustrated embodiments are provided to illustrate the invention and not to limit the scope of the invention.
Referring to fig. 1, the embodiment provides an external damage prevention monitoring and early warning system based on a distributed optical fiber vibration sensing technology, and the system includes a signal transmitter 1, an isolation device 2, a detection optical cable 3, a signal receiver 4 and an upper computer 5. The signal transmitter 1, the detection optical cable 3 and the signal receiver 4 are respectively connected with the isolation device 2. The signal receiver 3 is in signal connection with the upper computer 5. The signal emitter 1 is used for inputting pulse light signals to a detection optical cable 3 through an isolation device 2. The detection optical cable 3 is arranged in a cable channel or is laid beside a buried cable in an accompanying manner. The signal receiver 4 is used for receiving the light intensity signal output by the detection optical cable 3 through the isolation device 2, converting the light intensity signal into a current signal, and processing the current signal to obtain a vibration signal. The upper computer 5 is used for analyzing and positioning the vibration signals, determining the projection position and the longitudinal distance of the vibration source on the detection optical cable, and sending early warning information to the mobile terminal.
As a preferred example, the signal transmitter 1 comprises a signal generator 101, an optical pulse generator 102, a modulator 103, an amplifier 104 and a filter 105. The optical pulse generator 102 transmits continuous optical pulses to the modulator 103 through the optical fiber; the signal generator 101 sends an electric signal to the modulator 103 through an electric wire; the modulator 103 is used for modulating continuous light pulses and electric signals; the input end of the amplifier 104 is connected with the modulator 103 through an optical fiber, and the output end thereof is connected with the filter 105, and is used for amplifying the pulse optical signal output by the modulator 103, so that the detection distance is increased; the filter 105 is configured to filter a waste light signal in the amplified pulsed light signal, and input the filtered pulsed light signal to the isolation device 2 through an optical fiber.
The signal receiver 4 comprises a photodetector 401, an operational amplifier circuit 402 and a data acquisition card 403. The photoelectric detector 401, the operational amplifier circuit 402 and the data acquisition card 403 are sequentially connected through a circuit, and the data acquisition card 403 is in signal connection with the upper computer 5. The input end of the photodetector 401 is connected to the isolation device 2, and is configured to detect a light intensity signal of coherent backward rayleigh scattered light in the detection optical cable 3, and convert the light intensity signal into a current signal. The operational amplifier circuit 402 is configured to amplify the current signal output by the photodetector 401 and send the amplified current signal to the data acquisition card 403 for data processing.
Referring to fig. 2, the upper computer 5 includes a demodulation module 501, a first positioning module 502, a second positioning module 503, and an early warning module 504.
The demodulation module 501 is configured to virtualize a multi-segment detection optical cable into a long string of vibration sensing units which are independently distributed, and demodulate corresponding receiving time and intensity signals according to vibration signals received by each vibration sensing unit based on a coherent optical time domain reflection technique.
The first positioning module 502 is configured to determine a projection position of the vibration source on the detection cable based on the demodulated reception time and intensity signals.
The second positioning module 503 is configured to determine a longitudinal distance between the vibration source and the detection cable based on the vibration amplitude of the multi-segment detection cable.
The early warning module 504 is configured to generate corresponding early warning information according to the position of the detection optical cable where the vibration signal is received, the projection position of the vibration source on the detection optical cable, and the longitudinal distance between the vibration source and the detection optical cable, and to distribute the corresponding early warning information to a plurality of mobile terminals specified by a user.
Specifically, the first positioning module 502 is specifically configured to, when receiving a vibration signal, determine all vibration sensing units receiving the vibration signal at the same time according to the receiving time demodulated from the vibration signal, calculate a time difference value when the vibration signal reaches each vibration sensing unit, calculate a distance difference value when the vibration source reaches each vibration sensing unit according to the time difference value, form a hyperbola with the vibration sensing units as a focus and the distance difference value as a major axis, and determine a projection position of the vibration source on the detection optical cable according to an intersection point of the different hyperbolas. At the same time point, when two vibration sensing units receive vibration signals generated by the same vibration source, the distance difference between the vibration source and the two vibration sensing units can be determined according to the time difference between the vibration signals and the two vibration sensing units, the vibration source is located on a hyperbolic curve determined by the two vibration sensing units, if three vibration sensing units exist, two hyperbolic curves can be determined, and the vibration source is necessarily located at the intersection point of the two hyperbolic curves.
The second positioning module 503 is specifically configured to, when receiving a vibration signal, search for a point on the detection cable with the highest vibration amplitude, define the point with the highest vibration amplitude as a first sensor point S1, define the farthest point of the detection cable vibration caused by the vibration source as a second sensor point S2 with a distance d from S1, analyze the vibration waveforms of S1 and S2, obtain a time difference Δ t between the arrival times of the vibration signal at S1 and S2, obtain a propagation velocity of the vibration signal at the soil where the detection cable is located as V, and obtain a vibration propagation right triangle consisting of the propagation time and the vibration velocity:
(Vt 1 ) 2 +d 2 ＝(Vt 2 ) 2
wherein t is 1 Indicating the time, t, at which the vibration signal reaches S1 2 Representing the time when the vibration signal reaches S2, d is the distance between S1 and S2, t 2 ＝t 1 + Δ t, it can thus be obtained that the lateral distance y between the detection cable and the vibration source is:
the second positioning module 503 can accurately measure the lateral distance from the vibration source to the detection optical cable 3 by the above method, and does not need to modify the existing distributed optical fiber sensing vibration system. After the system is built on a test site, the ground with 3 testing distances of 3m, 8m and 13m above the detection optical cable is selected for a knocking experiment, wherein 5m is used as an alarm distance interval for alarm display of the system, namely, the longitudinal distance between the alarm display vibration source and the detection optical cable is smaller than 5m, 5-10 m and 10-15 m3 results, 10 times of tests are carried out at each testing distance, the finally obtained alarm accuracy is 93.3%, and the alarm accuracy of the system can completely meet daily monitoring requirements.
As a preferred example, referring to fig. 3 and 4, the system further includes a knocking test device, which is configured to automatically knock the ground where the detection optical cable is buried, so as to determine whether the detection performance of the detection optical cable is normal according to the feedback result of the detection optical cable, thereby implementing a periodic maintenance test on the system. Specifically, strike testing arrangement includes casing 6, be provided with control mainboard 7, communication module 8 and orientation module 9 in the casing 6. Be provided with automatic striking mechanism and running gear on the 6 bottoms of casing, control mainboard 7 links to each other with communication module 8, orientation module 9 signal respectively, communication module 8 is used for realizing the data interaction between control mainboard 7 and the host computer 5, orientation module 9 is used for the location to strike testing arrangement's real-time position. The automatic knocking mechanism is used for knocking the ground of a laying area of the detection optical cable, and the traveling mechanism is used for driving the shell 6 to move.
Automatic strike mechanism strikes subassembly 10 including the bottom, bottom strike subassembly 10 is used for strikeing the ground of testing arrangement below, including setting up in the cavity 1001 of 6 bottoms of casing, be equipped with baffle 1002 in the cavity 1001, the bar hole 1003 has been seted up on the baffle 1002. A rotating drum 1004 is arranged above the partition 1002, one end of the rotating drum 1004 is connected with the side wall of the cavity 1001 through a torsion spring 1005, and the other end of the rotating drum 1004 is provided with a limiting hole. A push plate 1006 is arranged beside the rotary drum 1004, a driving motor 1007 is arranged on one side of the push plate 1006, and a limiting part 1008 with a shape suitable for a limiting hole is arranged on an output shaft of the driving motor 1007. A first push rod motor 1009 is arranged on the other side of the push plate 1007, and a push rod of the first push rod motor 1009 is connected with the push plate 1006. A first knocking portion 1010 is arranged below the partition 1002, and the first knocking portion 1010 is connected with the partition 1003 through a first spring 1011. The drum 1004 is wound with a pulling rope 1012, and the end of the pulling rope 1012 passes through the slotted hole 1003 and is connected to the first striker 1010. The driving motor 1007 and the first push rod motor 1009 are respectively connected to the control main board 7 through a control circuit.
In the bottom knock assembly 10 in the initial state, the limiting portion 1008 on the output shaft of the driving motor 1007 is inserted into the limiting hole at one end of the drum 1004, most of the pulling rope 1012 is wound on the drum 1004, the torsion spring 1005 is twisted and compressed, and the pulling rope 1012 pulls the first knock portion 1010 to move upwards, thereby compressing the first spring 1011. When knocking ground, the first push rod motor 1009 drives the push plate 1007 to move in the direction away from the rotary drum 1004, so that the limiting part 1008 exits from the limiting hole, the rotary drum 1004 is no longer limited, the traction rope 1012 is released, after upward force on the traction rope 1012 disappears, the first knocking part 1010 pops out of the bottom of the cavity 1001 under the action of the first spring 1011, an opening is formed in the bottom of the cavity 1001, and the first knocking part 1010 pops out of the opening and knocks the ground. After the knocking is completed, the first push rod motor 1009 drives the push plate 1007 to move towards the direction close to the rotating drum 1004, so that the limiting part 1008 is inserted into the limiting hole again, and the driving motor 1007 drives the limiting part 1008 to drive the rotating drum 1004 to rotate against the force of the torsion spring 1005, so that the traction rope 1012 is wound on the rotating drum 1004 again. The traction rope 1012 pulls the first knock part 1010 to move upward against the elastic force of the first spring 1011, thereby being re-received into the cavity 1001.
As a preferred example, referring to FIG. 5, the automatic tapping mechanism further comprises a side tapping component 11, and the side tapping component is used for tapping media on the side of the tapping test device so as to meet test requirements under different scenes. The side knocking assembly 11 comprises an annular electric guide rail 1101 sleeved on the side face of the shell, and a sliding block 1102 is arranged on the annular electric guide rail 1101 in a sliding mode. The slider 1102 is provided with a cylinder 1103, a second knocking part 1104 is arranged in the cylinder 1103 in a sliding mode, the second knocking part 1104 is connected with the end of the cylinder through a second spring 1111, and a plurality of first magnets 1105 are arranged at the top and the bottom of the second knocking part 1104. The upper wall and the lower wall of the barrel 1103 are both provided with a chute 1106, the chute 1106 is internally provided with second magnets 1107 in an arrayed manner, the first magnets 1107 are inserted into the chute 1106, and the magnetic pole array directions of the first magnets 1105 and the second magnets 1107 are the same. One end of the second knocking portion 1104 is provided with a ring-shaped portion 1108. One end of the cylinder 1103 is provided with a second push rod motor 1109, and the end of the push rod of the second push rod motor 1109 is provided with an electric clamper 1110.
The annular electric guide 1101 is connected with the control main board 7 through a control circuit, and is used for driving the slider to reciprocate along the guide, so as to move the cylinder 1103 to different directions. In the initial state, the electric clamp 1110 holds the ring-shaped portion 1108 at the rear end of the second tap portion 1104, so that the second tap portion 1104 compresses the second spring 1111. When knocking is performed, the electric clamp 1110 releases the annular part 1108, the second knocking part 1104 is ejected out of the cylinder 1103 under the action of the second spring 1111, when the second knocking part is ejected, the first magnet 1105 slides through the sliding groove 1106, and based on the principle that like poles repel and opposite poles attract, the magnetic action of the second magnet 1107 to the first magnet 1105 can accelerate the second knocking part 1104, so that the second knocking part 1104 can obtain enough acceleration under the condition that the length of the second spring 1111 is limited, sufficient momentum is generated for knocking, and the volume of the cylinder 1103 can be controlled, so that the gravity center of the knocking test device can be kept stable. After the striking is completed, the second push rod motor 1109 extends the push rod so that the electric holder 1110 can re-hold the annular portion 1108, and then the second push rod motor 1109 shortens the push rod so that the second striking portion 1104 moves toward the cylinder 1103, the second spring 1111 is compressed again, and the side striking assembly 11 is restored to the original state.
The walking mechanism comprises a driving motor 13 and walking wheels 12, an output shaft of the driving motor 13 is connected with the walking wheels 12, and the driving motor 13 is connected with the control main board 7 through a control circuit.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a prevent outer broken monitoring and early warning system based on distributed optical fiber vibration sensing technology which characterized in that, the system includes signal transmitter, isolation equipment, detection optical cable, signal receiver and host computer, signal transmitter, detection optical cable, signal receiver are connected with isolation equipment respectively, signal receiver and host computer signal link to each other, signal transmitter is used for inputing pulsed light signal to detection optical cable through isolation equipment on, detection optical cable sets up in cable channel or lays in the other company of buried cable, signal receiver is used for receiving the light intensity signal of detection optical cable output through isolation equipment, turns into current signal with light intensity signal, handles current signal and obtains vibration signal, the host computer is used for carrying out the analysis location to vibration signal, confirms projection position and longitudinal distance of vibration source on detection optical cable, and sending early warning information to the mobile terminal.
2. The anti-break-outside monitoring and early warning system based on the distributed optical fiber vibration sensing technology is characterized in that the signal emitter comprises a signal generator, an optical pulse generator, a modulator, an amplifier and a filter, the optical pulse generator emits continuous optical pulses to the modulator through optical fibers, the signal generator sends electric signals to the modulator through electric wires, the modulator is used for modulating the continuous optical pulses and the electric signals, the input end of the amplifier is connected with the modulator through optical fibers, the output end of the amplifier is connected with the filter and used for amplifying pulse optical signals output by the modulator, and the filter is used for filtering useless optical signals in the amplified pulse optical signals and inputting the filtered pulse optical signals into the isolation device through the optical fibers.
3. The system of claim 1, wherein the signal receiver comprises a photodetector, an operational amplifier circuit and a data acquisition card, the photodetector, the operational amplifier circuit and the data acquisition card are sequentially connected through a circuit, the data acquisition card is connected with an upper computer through a signal, an input end of the photodetector is connected with an isolation device and used for detecting a light intensity signal of a coherent backward Rayleigh scattering light in the detection optical cable and converting the light intensity signal into a current signal, and the operational amplifier circuit is used for amplifying the current signal output by the photodetector and sending the current signal to the data acquisition card for data processing.
4. The system of claim 1, wherein the upper computer comprises:
the demodulation module is used for virtualizing the multi-section detection optical cable into a long string of vibration sensing units which are independently distributed, and demodulating corresponding receiving time and intensity signals according to the vibration signals received by each vibration sensing unit;
the first positioning module is used for determining the projection position of the vibration source on the detection optical cable based on the receiving time and the intensity signal obtained by demodulation;
the second positioning module is used for determining the longitudinal distance between the vibration source and the detection optical cable based on the vibration amplitude of the multi-section detection optical cable;
and the early warning module is used for receiving the position of the detection optical cable of the vibration signal, the projection position of the vibration source on the detection optical cable and the longitudinal distance between the vibration source and the detection optical cable, generating corresponding early warning information and distributing the early warning information to a plurality of mobile terminals appointed by users.
5. The anti-break-out monitoring and early warning system based on the distributed optical fiber vibration sensing technology as claimed in claim 4, wherein the first positioning module is specifically configured to determine all vibration sensing units receiving the vibration signals at the same time point according to the demodulated receiving time when the vibration signals are received, calculate a time difference value of the vibration signals reaching each vibration sensing unit, calculate a distance difference value of the vibration source reaching each vibration sensing unit according to the time difference value, make a hyperbolic curve with the vibration sensing units as a focal point and the distance difference value as a major axis, and determine a projection position of the vibration source on the detection optical cable according to an intersection point of different hyperbolic curves.
6. The anti-break-through monitoring and early-warning system based on the distributed optical fiber vibration sensing technology as claimed in claim 4, wherein the second positioning module is specifically configured to search a point on the detection cable with the highest vibration amplitude when receiving the vibration signal, define the point with the highest vibration amplitude as a first sensor point S1, define the farthest point of the detection cable vibration caused by the vibration source as a second sensor point S2 which is at a distance d from S1, analyze the vibration waveforms of S1 and S2, obtain the time difference Δ t when the vibration signal reaches S1 and S2, the propagation velocity of the vibration signal in the soil where the detection cable is located is V, and obtain a vibration propagation right-angle triangle consisting of the propagation time and the vibration velocity:
(Vt 1 ) 2 +d 2 ＝(Vt 2 ) 2
wherein t is 1 Indicating the time, t, at which the vibration signal reaches S1 2 Representing the time when the vibration signal reaches S2, d is the distance between S1 and S2, t 2 ＝t 1 + Δ t, it can thus be obtained that the lateral distance y between the detection cable and the vibration source is:
7. the system of claim 1, further comprising a knocking test device, wherein the knocking test device comprises a housing, a control main board, a communication module and a positioning module are arranged in the housing, an automatic knocking mechanism and a traveling mechanism are arranged on the bottom of the housing, the control main board is in signal connection with the communication module and the positioning module respectively, the communication module is used for achieving data interaction between the control main board and an upper computer, the automatic knocking mechanism is used for knocking the ground of a laying area of the detection optical cable, and the traveling mechanism is used for driving the housing to move.
8. The system of claim 7, wherein the automatic striking mechanism comprises a bottom striking component, the bottom striking component comprises a cavity arranged at the bottom of the housing, a partition is arranged in the cavity, a strip-shaped hole is formed in the partition, a rotary drum is arranged above the partition, one end of the rotary drum is connected with the side wall of the cavity through a torsion spring, a limiting hole is formed at the other end of the rotary drum, a push plate is arranged beside the rotary drum, a driving motor is arranged on one side of the push plate, a limiting part adaptive to the limiting hole in shape is arranged on an output shaft of the driving motor, a first push rod motor is arranged on the other side of the push plate, a push rod of the first push rod motor is connected with the push plate, a first striking part is arranged below the partition, and the first striking part is connected with the partition through a first spring, the rotary drum is wound with a traction rope, and the end part of the traction rope penetrates through the strip-shaped hole to be connected with the first knocking part.
9. The anti-break monitoring and early warning system based on the distributed optical fiber vibration sensing technology as claimed in claim 7, wherein the automatic knocking mechanism comprises a side knocking component, the side knocking component comprises an annular electric guide rail sleeved on the side of the housing, a slide block is slidably arranged on the annular electric guide rail, a cylinder is arranged on the slide block, a second knocking portion is slidably arranged in the cylinder and connected with the end portion of the cylinder through a second spring, a plurality of first magnets are arranged at the top and the bottom of the second knocking portion, chutes are formed in the upper wall and the lower wall of the cylinder, second magnets are arranged in the chutes, the first magnets are inserted into the chutes, the arrangement directions of magnetic poles of the first magnets and the second magnets are the same, an annular portion is arranged at one end of the second knocking portion, and a second push rod motor is arranged at one end of the cylinder, and an electric clamp holder is arranged at the end part of the push rod of the second push rod motor.
10. The anti-break-out monitoring and early warning system based on the distributed optical fiber vibration sensing technology as claimed in claim 7, wherein the traveling mechanism comprises a driving motor and a traveling wheel, an output shaft of the driving motor is connected with the traveling wheel, and the driving motor is connected with the control main board through a control circuit.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115100800A (en) * | 2022-08-24 | 2022-09-23 | 高勘(广州)技术有限公司 | DVS-based optical cable early warning system and control method thereof |
| CN117950077A (en) * | 2024-03-27 | 2024-04-30 | 山东省科学院激光研究所 | Distributed optical fiber sensing detection method |
| CN118067233A (en) * | 2024-04-22 | 2024-05-24 | 南京同科科技发展有限公司 | Vibration optical fiber detector test device |
| CN118189868A (en) * | 2023-01-17 | 2024-06-14 | 国家石油天然气管网集团有限公司 | Method and device for determining construction position based on multiple optical cables and electronic equipment |
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2022
- 2022-05-31 CN CN202210609837.0A patent/CN114877986A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115100800A (en) * | 2022-08-24 | 2022-09-23 | 高勘(广州)技术有限公司 | DVS-based optical cable early warning system and control method thereof |
| CN115100800B (en) * | 2022-08-24 | 2022-11-18 | 高勘(广州)技术有限公司 | DVS-based optical cable early warning system and control method thereof |
| CN118189868A (en) * | 2023-01-17 | 2024-06-14 | 国家石油天然气管网集团有限公司 | Method and device for determining construction position based on multiple optical cables and electronic equipment |
| CN117950077A (en) * | 2024-03-27 | 2024-04-30 | 山东省科学院激光研究所 | Distributed optical fiber sensing detection method |
| CN118067233A (en) * | 2024-04-22 | 2024-05-24 | 南京同科科技发展有限公司 | Vibration optical fiber detector test device |
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