CN114812787A - Method for monitoring network state of water supply and drainage pipe in real time based on distributed optical fiber sensing - Google Patents
Method for monitoring network state of water supply and drainage pipe in real time based on distributed optical fiber sensing Download PDFInfo
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- CN114812787A CN114812787A CN202210495176.3A CN202210495176A CN114812787A CN 114812787 A CN114812787 A CN 114812787A CN 202210495176 A CN202210495176 A CN 202210495176A CN 114812787 A CN114812787 A CN 114812787A
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- optical fiber
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- sensing
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
Abstract
The invention discloses a method for monitoring the state of a water supply and drainage pipe network in real time based on distributed optical fiber sensing. The device specifically comprises an optical fiber acoustic wave sensor, a sensing optical fiber and a locking sheet; the optical fiber sound wave sensor is connected with the sensing optical fiber, the sensing optical fiber is wound on the outer surface of the device to be tested through the locking piece, when the device to be tested vibrates, light in the sensing optical fiber changes due to the elasto-optic effect, and the vibration event can be monitored by detecting the change of the light, so that the technical problems that in the prior art, the monitoring means of an underground pipeline network is limited, a large amount of manual work is needed are solved, the technical effect of monitoring the underground pipeline network in real time is achieved on the premise that manual exploration is not needed, and the use scene is widened.
Description
Technical Field
The embodiment of the invention relates to the technical field of safety monitoring, in particular to a method for monitoring the state of a water supply and drainage pipe network in real time based on distributed optical fiber sensing.
Background
The urban underground pipe network is densely distributed, water supply pipelines climb year by year along with water consumption, the pipelines are continuously increased, service time of the pipelines is increased, and due to the corrosion of the pipelines, natural disasters, artificial damages and other factors, the safety of the pipelines becomes increasingly severe. The leakage of the pipeline not only brings disadvantages to daily life water of people, but also brings huge economic and environmental losses, and even brings huge threats to the life and property safety of people.
However, the existing means for monitoring the state of the water supply network has many problems, such as limited means for monitoring the health of the urban underground network, especially lack of means for monitoring the state of the urban underground network without affecting the normal operation and use conditions of roads; secondly, more monitoring means at the present stage still adopt the traditional artificial exploration method, an off-line noise meter and the like, but the real-time monitoring of the whole pipe network state cannot be realized only by the existing method.
Disclosure of Invention
The embodiment of the invention provides a device for monitoring the state of a water supply and drainage pipe network in real time based on distributed optical fiber sensing, so as to achieve the technical effect of monitoring the state of the whole pipe network in real time.
In a first aspect, an embodiment of the present invention provides a device for monitoring a state of a water supply and drainage pipe network in real time based on distributed optical fiber sensing, including an optical fiber acoustic wave sensor, a sensing optical fiber and a locking sheet; the optical fiber acoustic wave sensor is connected with the sensing optical fiber, and the sensing optical fiber is wound on the outer surface of the device to be tested through the locking sheet.
Preferably, the locking piece comprises a metal elastic piece and a pressing block fixed on the inner side of the metal elastic piece, and the sensing optical fiber is installed between the metal elastic piece and the pressing block fixed on the inner side of the metal elastic piece.
Preferably, the device further comprises a movable mounting seat; the movable mounting seat is fixedly provided with the sensing optical fiber every other preset length.
Preferably, the sensing optical fiber is a single mode optical fiber and is fixedly installed along a water supply and drainage pipe network, and the device to be tested comprises a fire hydrant and a valve.
Preferably, the optical fiber acoustic wave sensor comprises a laser, a beam splitter, a sensing optical fiber and a signal processing device; the laser is connected with the optical splitter, and the optical splitter is connected with the sensing optical fiber and the signal processing device; wherein the content of the first and second substances,
the laser is used for providing an initial optical signal;
the sensing optical fiber is used for generating tiny changes according to the refractive index and the length of light rays in the elasto-optical effect when the device to be tested vibrates;
the optical splitter is used for splitting the initial optical signal sent by the laser and the monitoring optical signal returned by the sensing optical fiber according to a preset proportion and then sending the split optical signals to the signal processing device;
and the signal processing device is used for calculating the light signal obtained after the initial light signal is split and the light signal obtained after the monitoring light signal is split to obtain the light intensity obtained after the initial light signal is split and the light intensity obtained after the monitoring light signal is split.
Preferably, the real-time monitoring circuit for the state of the water supply and drainage pipe network based on the distributed optical fiber sensing further comprises a display device; the display device is connected with the signal processing device; wherein the content of the first and second substances,
and the display device is used for displaying and comparing the light intensity after the initial light signal is split and the light intensity after the monitoring light signal is split in a graph mode.
Preferably, the signal processing device comprises a detector, a data acquisition circuit and a data processing circuit; the detector is connected with the optical splitter, the data acquisition circuit is connected with the detector, and the data processing circuit is connected with the data acquisition circuit; wherein the content of the first and second substances,
the detector is used for converting the optical signal obtained after the initial optical signal is split and the optical signal obtained after the monitoring optical signal is split into electric signals;
the data acquisition circuit acquires the electric signal and converts the electric signal into a digital signal;
and the data processing circuit is used for obtaining the light intensity of the initial optical signal after light splitting and the light intensity of the monitoring optical signal after light splitting according to the digital signal.
The present application also proposes an electronic device comprising a fiber acoustic wave sensor as described above.
The application also provides a supply and drainage pipe network state real-time supervision equipment based on distributed optical fiber sensing, supply and drainage pipe network state real-time supervision equipment based on distributed optical fiber sensing includes as above supply and drainage pipe network state real-time supervision device based on distributed optical fiber sensing.
The application also provides a water supply and drainage pipe network state real-time monitoring method based on distributed optical fiber sensing, which is characterized by comprising the following steps:
the laser provides an initial optical signal;
when the device to be tested vibrates, the sensing optical fiber generates tiny changes according to the refractive index and the length of light inside the elasto-optical effect;
the optical splitter splits the initial optical signal sent by the laser and the monitoring optical signal returned by the sensing optical fiber according to a preset proportion and then sends the split signals to a signal processing device;
and the signal processing device calculates the light signal obtained after the initial light signal is split and the light signal obtained after the monitoring light signal is split to obtain the light intensity obtained after the initial light signal is split and the light intensity obtained after the monitoring light signal is split.
The sensing optical fiber is wound on the outer surface of the device to be tested through the locking piece, when the device to be tested vibrates, light in the sensing optical fiber changes due to the elasto-optical effect, and vibration events can be monitored through detecting the light changes, so that the technical problems that in the prior art, the monitoring means of an underground pipeline network is limited, a large amount of manual work is needed are solved, the technical effect of monitoring the underground pipeline network in real time is achieved on the premise that manual exploration is not needed, and the use scene is widened.
Drawings
FIG. 1 is a functional block diagram of one embodiment of a task auto-configuration circuit of the present invention;
FIG. 2 is a functional block diagram of another embodiment of the task autoconfiguration circuit of the present invention;
FIG. 3 is a functional block diagram of another embodiment of the task auto-configuration circuit of the present invention.
Description of reference numerals:
100-laser, 200-beam splitter, 300-signal processing device, 400-display device.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The invention provides a real-time monitoring device for the state of a water supply and drainage pipe network based on distributed optical fiber sensing, which comprises an optical fiber acoustic wave sensor, a sensing optical fiber and a locking sheet, wherein the sensing optical fiber is arranged on the optical fiber acoustic wave sensor; the optical fiber acoustic wave sensor is connected with the sensing optical fiber, and the sensing optical fiber is wound on the outer surface of the device to be tested through the locking sheet.
It should be noted that, the monitoring device of the present application is based on the principle of coherent rayleigh scattering, and utilizes the sensitivity characteristic of the optical fiber to sound wave vibration, when external vibration acts on the sensing optical fiber, due to the elasto-optical effect, the refractive index and the length of the optical fiber will change slightly, thereby causing the phase change of the transmission signal in the optical fiber, and causing the light intensity to change; when the external vibration causes the phase to change, the signal intensity of the point changes, and the detection of the vibration event can be realized by detecting the intensity change of the signals before and after the vibration.
Specifically, the locking piece comprises a metal elastic sheet and a pressing block fixed on the inner side of the metal elastic sheet, and the sensing optical fiber is installed between the metal elastic sheet and the pressing block fixed on the inner side of the metal elastic sheet.
It is easily understood that because the vibration incident of environment is gathered to needs optic fibre, traditional fixed mode for example adhesion, mode such as tie up are unfavorable for the vibration of optic fibre and take place, and this has certain influence to the collection of vibration incident, consequently need adopt new fixed mode, and the sensing optical fibre is fixed to this application use the mode of metal shrapnel cooperation briquetting, and the area of contact of optic fibre and stay is little, is favorable to gathering the vibration incident.
According to the technical scheme, the sensing optical fiber is wound on the outer surface of the device to be tested, when the device to be tested vibrates, light in the sensing optical fiber changes due to the elasto-optical effect, the vibration event can be monitored by detecting the change of the light through the sensing optical fiber, the technical problem that in the prior art, the underground pipeline network is limited in monitoring means and needs to be used in large quantity of manpower is solved, the technical effect of monitoring the underground pipeline network in real time is achieved on the premise that artificial exploration is not needed, and the use scene is widened.
The invention provides a device for monitoring the state of a water supply and drainage pipe network in real time based on distributed optical fiber sensing, which also comprises a movable mounting seat; the movable mounting seat is fixedly provided with the sensing optical fiber every other preset length.
It is worth emphasizing that the movable installation seat is paved along the water pipe network, and the optical fiber distance is long, so that the movable installation seat can be adopted to reduce the large-angle bending of the optical fiber, reduce the attenuation of light intensity, improve the intensity of returned monitoring signals, improve the monitoring distance to a certain extent and enlarge the monitoring range.
Specifically, the sensing optical fiber is a single-mode optical fiber and fixedly mounted in a water supply and drainage pipe network, and the device to be tested comprises a fire hydrant and a valve.
It should be noted that the fire hydrant and the valve are easy to leak, so that the fire hydrant and the valve need the sensing optical fiber to be wound and installed on the outer surfaces of the fire hydrant and the valve, the fire hydrant and the valve have buried parts, and some valves are buried valves, and the water leakage situation is difficult to find in time, but the sound and the vibration of the water leakage can be collected by the sensing optical fiber, and the feedback is monitored in real time, so that the maintenance speed is improved, and the economic loss is reduced.
The embodiment discloses the type of the selected optical fiber and the type of the device to be detected through the fixing mode of the optical fiber, perfects the technical scheme, improves the sensitivity of the sensing optical fiber to the detection of the vibration event, improves the monitoring precision to a certain extent, and improves the technical effect of monitoring the state of the whole pipe network in real time.
Referring to fig. 1, the utility model provides a real-time monitoring circuit for the state of a water supply and drainage pipe network based on distributed optical fiber sensing, wherein the optical fiber acoustic wave sensor comprises a laser, a beam splitter and a signal processing device; the laser is connected with the optical splitter, and the optical splitter is connected with the sensing optical fiber and the signal processing device; wherein the content of the first and second substances,
the laser is used for providing an initial optical signal;
the sensing optical fiber is used for generating tiny changes according to the refractive index and the length of light rays in the elasto-optical effect when the device to be tested vibrates;
the optical splitter is used for splitting the initial optical signal sent by the laser and the monitoring optical signal returned by the sensing optical fiber according to a preset proportion and then sending the split optical signals to the signal processing device;
and the signal processing device is used for calculating the light signal obtained after the initial light signal is split and the light signal obtained after the monitoring light signal is split to obtain the light intensity obtained after the initial light signal is split and the light intensity obtained after the monitoring light signal is split.
It is easily understood that, this embodiment is based on the principle of coherent rayleigh scattering, adopt the ordinary single mode communication optical cable of single core as the sensor, utilize optic fibre to the sensitive characteristic of vibration, when external vibration acts on sensing optical fibre, because the elasto-optic effect, the refracting index of optic fibre, length will produce small change, thereby lead to the phase place change of transmission signal in the optic fibre, make the light intensity change, make the signal intensity of this point change when external vibration leads to the phase place to change, detect the intensity change of signal before and after the vibration through beam splitter and time delay comparator, can realize the detection of vibration incident.
Referring to fig. 2, the real-time monitoring circuit for the state of the water supply and drainage pipe network based on distributed optical fiber sensing further comprises a display device; the display device is connected with the signal processing device; wherein the content of the first and second substances,
and the display device is used for displaying and comparing the light intensity after the initial light signal is split and the light intensity after the monitoring light signal is split in a graph mode.
It is emphasized that, since the automatic monitoring of vibration events may be in the form of false positives or false negatives,
when water leakage occurs, the vibration event can be continuously monitored, and if the condition of missing report occurs, an operator can observe the display device to find abnormality in time.
The system comprises a light source, a light detector and a controller, wherein the light source is used for detecting the change of the light intensity of the light source, and the controller is used for controlling the light source to emit light according to the change of the light intensity.
It should be noted that, in this embodiment, the alarm may be an alarm program, an audible alarm device, a light alarm device, and a mail alarm device installed in the upper computer, and when the alarm is given by using the alarm program of the upper computer, the upper computer may calculate the specific position of the vibration area by using the propagation speed of the light in the optical fiber, so as to implement timely and accurate investigation.
Referring to fig. 3, the signal processing device includes a detector, a data acquisition circuit, and a data processing circuit; the detector is connected with the optical splitter, the data acquisition circuit is connected with the detector, and the data processing circuit is connected with the data acquisition circuit; wherein, the first and the second end of the pipe are connected with each other,
the detector is used for converting the optical signal obtained after the initial optical signal is split and the optical signal obtained after the monitoring optical signal is split into electric signals;
the data acquisition circuit acquires the electric signal and converts the electric signal into a digital signal;
and the data processing circuit is used for obtaining the light intensity of the initial optical signal after light splitting and the light intensity of the monitoring optical signal after light splitting according to the digital signal.
The embodiment discloses a specific circuit, perfects the technical scheme, divides an optical signal emitted by a laser and an optical signal returned by sensing light into two parts by an optical splitter, and calculating the light signal after the initial light signal is split and the light signal after the monitoring light signal is split by a signal processing device to obtain the light intensity after the initial light signal is split and the light intensity after the monitoring light signal is split, wherein when no vibration occurs, the front and rear light intensities are consistent, and when the vibration occurs, due to the elasto-optic effect, the refractive index and the length of the optical fiber will be slightly changed, thereby causing the phase change of the transmission signal in the optical fiber and causing the light intensity to change, then the signal processing device can monitor in the first time, the area to be monitored can be monitored only by covering all the areas to be monitored by the sensing optical fibers, and the technical effect of monitoring the state of the whole pipe network in real time is achieved.
Specifically, the signal processing device comprises a detector, a data acquisition circuit and a data processing circuit; the detector is connected with the optical splitter, the data acquisition circuit is connected with the detector, and the data processing circuit is connected with the data acquisition circuit; wherein the content of the first and second substances,
the detector is used for converting the optical signal obtained after the initial optical signal is split and the optical signal obtained after the monitoring optical signal is split into electric signals;
the data acquisition circuit acquires the electric signal and converts the electric signal into a digital signal;
and the data processing circuit is used for obtaining the light intensity of the initial optical signal after light splitting and the light intensity of the monitoring optical signal after light splitting according to the digital signal.
It is easy to understand that, the process of digitizing the light intensity of light needs to perform photoelectric conversion and analog-to-digital conversion, but does not convert into digital signals, so that it is difficult to perceive that the refractive index and the length of light inside the elasto-optical effect change slightly, and therefore, the optical signals need to be converted into electrical signals first, and then the electrical signals are converted into digital signals to improve the data accuracy after processing, and if a single circuit is used to process the optical signals, certain interference exists between the optical signals and the digital signals.
This embodiment is through disclosing the concrete circuit of optic fibre acoustic wave sensor, technical scheme has further been perfected, provide initial light signal through the laser instrument, and send to the detector in the data processing device by data processing device after splitting initial light signal and the monitoring light signal that returns through the spectroscope, data acquisition circuit and data processing circuit are handled respectively, turn into the signal of telecommunication with light signal reconversion digital signal, demonstrate digital signal on display device with the mode of chart again, audio-visual signal that shows to have the vibration incident shows, the monitoring to the vibration incident has been realized, the measurement accuracy is improved, user experience has been improved.
The invention also provides electronic equipment which comprises the optical fiber acoustic wave sensor.
Of course, the electronic device provided in the embodiment of the present invention has the corresponding functional modules and beneficial effects of the optical fiber acoustic wave sensor, which are not described in detail herein.
The invention also provides a device for monitoring the state of the water supply and drainage pipe network in real time based on the distributed optical fiber sensing, which comprises the device for monitoring the state of the water supply and drainage pipe network in real time based on the distributed optical fiber sensing.
Certainly, the device for monitoring the state of the water supply and drainage pipe network in real time based on the distributed optical fiber sensing provided by the embodiment of the invention has the corresponding functional modules and beneficial effects of the optical fiber acoustic wave sensor, and the details are not repeated herein.
The invention also provides a water supply and drainage pipe network state real-time monitoring method based on distributed optical fiber sensing, which comprises the following steps:
the laser provides an initial optical signal;
easily understand is because need utilize the elasto-optic effect to monitor the vibration incident, consequently need have directional light signal to send to the transmission distance of guaranteeing light signal in the sensing light, this application uses the laser instrument as the light source, and it is fixed to possess the direction of transmission, and the light intensity is big characteristics, comparatively accords with the demand of real-time supervision underground piping network.
When the device to be tested vibrates, the sensing optical fiber generates tiny changes according to the refractive index and the length of light inside the elasto-optical effect;
the optical splitter splits the initial optical signal sent by the laser and the monitoring optical signal returned by the sensing optical fiber according to a preset proportion and then sends the split signals to a signal processing device;
and the signal processing device calculates the light signal obtained after the initial light signal is split and the light signal obtained after the monitoring light signal is split to obtain the light intensity obtained after the initial light signal is split and the light intensity obtained after the monitoring light signal is split.
Certainly, the method for monitoring the state of the water supply and drainage pipe network based on distributed optical fiber sensing provided by the embodiment of the invention has the corresponding functional modules and beneficial effects of the optical fiber acoustic wave sensor, and is not described in detail herein.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods of the embodiments of the present invention.
It should be noted that, in the embodiment of the above search apparatus, each included unit and module are merely divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A water supply and drainage pipe network state real-time monitoring device based on distributed optical fiber sensing is characterized by comprising an optical fiber acoustic wave sensor, a sensing optical fiber and a locking sheet; the optical fiber acoustic wave sensor is connected with the sensing optical fiber, and the sensing optical fiber is wound on the outer surface of the device to be tested through the locking sheet.
2. The device for monitoring the state of the water supply and drainage pipe network based on the distributed optical fiber sensing of claim 1, wherein the locking piece comprises a metal elastic piece and a pressing block fixed on the inner side of the metal elastic piece, and the sensing optical fiber is arranged between the metal elastic piece and the pressing block fixed on the inner side of the metal elastic piece.
3. The device for monitoring the state of the water supply and drainage pipe network based on the distributed optical fiber sensing is characterized by further comprising a movable mounting seat; the movable mounting seat is fixedly provided with the sensing optical fiber every other preset length.
4. The device for monitoring the state of the water supply and drainage pipe network based on the distributed optical fiber sensing of claim 1, wherein the sensing optical fiber is a single-mode optical fiber and is fixedly installed along the water supply and drainage pipe network, and the device to be tested comprises a fire hydrant and a valve.
5. The device for monitoring the state of a water supply and drainage pipe network based on distributed optical fiber sensing in real time as claimed in claim 1, wherein the optical fiber acoustic wave sensor comprises a laser, a light splitter and a signal processing device; the laser is connected with the optical splitter, and the optical splitter is connected with the sensing optical fiber and the signal processing device; wherein the content of the first and second substances,
the laser is used for providing an initial optical signal;
the sensing optical fiber is used for generating tiny changes according to the refractive index and the length of light rays in the elasto-optical effect when the device to be tested vibrates;
the optical splitter is used for splitting the initial optical signal sent by the laser and the monitoring optical signal returned by the sensing optical fiber according to a preset proportion and then sending the split optical signals to the signal processing device;
and the signal processing device is used for calculating the light signal obtained after the initial light signal is split and the light signal obtained after the monitoring light signal is split to obtain the light intensity obtained after the initial light signal is split and the light intensity obtained after the monitoring light signal is split.
6. The distributed optical fiber sensing-based real-time monitoring circuit for the state of the water supply and drainage pipe network is characterized by further comprising a display device; the display device is connected with the signal processing device; wherein, the first and the second end of the pipe are connected with each other,
and the display device is used for displaying and comparing the light intensity after the initial light signal is split and the light intensity after the monitoring light signal is split in a graph mode.
7. The distributed optical fiber sensing-based real-time monitoring circuit for the state of a water supply and drainage pipe network is characterized in that the signal processing device comprises a detector, a data acquisition circuit and a data processing circuit; the detector is connected with the optical splitter, the data acquisition circuit is connected with the detector, and the data processing circuit is connected with the data acquisition circuit; wherein the content of the first and second substances,
the detector is used for converting the optical signal obtained after the initial optical signal is split and the optical signal obtained after the monitoring optical signal is split into electric signals;
the data acquisition circuit acquires the electric signal and converts the electric signal into a digital signal;
and the data processing circuit is used for obtaining the light intensity of the initial optical signal after light splitting and the light intensity of the monitoring optical signal after light splitting according to the digital signal.
8. An electronic device comprising the fiber acoustic wave sensor according to any one of claims 5-7.
9. A device for monitoring the state of a water supply and drainage pipe network based on distributed optical fiber sensing in real time, which comprises the device for monitoring the state of the water supply and drainage pipe network based on distributed optical fiber sensing according to any one of claims 1 to 7.
10. A water supply and drainage pipe network state real-time monitoring method based on distributed optical fiber sensing is characterized by comprising the following steps:
the laser provides an initial optical signal;
when the device to be tested vibrates, the sensing optical fiber generates tiny changes according to the refractive index and the length of light inside the elasto-optical effect;
the optical splitter splits the initial optical signal sent by the laser and the monitoring optical signal returned by the sensing optical fiber according to a preset proportion and then sends the split signals to a signal processing device;
and the signal processing device calculates the light signal obtained after the initial light signal is split and the light signal obtained after the monitoring light signal is split to obtain the light intensity obtained after the initial light signal is split and the light intensity obtained after the monitoring light signal is split.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116719138A (en) * | 2023-08-04 | 2023-09-08 | 中国电力科学研究院有限公司 | Optical fiber laying equipment, underground pipeline positioning method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116719138A (en) * | 2023-08-04 | 2023-09-08 | 中国电力科学研究院有限公司 | Optical fiber laying equipment, underground pipeline positioning method and system |
| CN116719138B (en) * | 2023-08-04 | 2023-10-20 | 中国电力科学研究院有限公司 | Optical fiber laying equipment, underground pipeline positioning method and system |
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