CN115683310A - Vibration monitoring method and system based on distributed optical fiber - Google Patents
Vibration monitoring method and system based on distributed optical fiber Download PDFInfo
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- CN115683310A CN115683310A CN202211322449.0A CN202211322449A CN115683310A CN 115683310 A CN115683310 A CN 115683310A CN 202211322449 A CN202211322449 A CN 202211322449A CN 115683310 A CN115683310 A CN 115683310A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 131
- 238000012544 monitoring process Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 238000012545 processing Methods 0.000 claims description 11
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- 230000003287 optical effect Effects 0.000 claims description 4
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- 230000002159 abnormal effect Effects 0.000 claims description 2
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- 239000000835 fiber Substances 0.000 claims 2
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Abstract
The application discloses a vibration monitoring method and system based on distributed optical fibers, which comprises the following steps: emitting laser into the vibrating optical fiber; demodulating vibration signal data from the reflected laser signal; receiving weather information monitored by a weather monitoring module in real time; judging whether the vibration intensity exceeds a preset value; if not, judging that the perimeter security is in a normal state; if the weather information exceeds the preset threshold value, further judging whether the weather information exceeds the preset threshold value; if the weather information exceeds a preset threshold value, preliminarily judging that the vibration of the corresponding optical fiber position is caused by weather reasons; if the weather information does not exceed the preset threshold value, the invasion of the corresponding optical fiber position is judged, and an alarm is given. The interference of weather reasons such as strong wind, rain and the like on optical fiber vibration monitoring is eliminated, and the accuracy of the distributed optical fiber-based vibration detection system on perimeter security detection is improved.
Description
Technical Field
The disclosure belongs to the technical field of optical fiber detection, and particularly relates to a vibration detection method and a detection system based on distributed optical fibers.
Background
The perimeter security monitoring of areas such as airports, railways, border lines and the like is more and more important, but is limited by conditions of various aspects such as terrain, topography and the like, the precaution difficulty is higher, and the precaution requirement is higher.
The optical fiber sensing has a series of unique advantages of electromagnetic interference resistance, long transmission distance, easiness in forming a distributed sensing network and the like, can not be limited by terrain and topography, and is increasingly applied to the fields of perimeter security protection, seismic wave monitoring and the like in recent years.
However, in the process of monitoring the perimeter security, the weather such as strong wind or heavy rain will interfere with the monitoring of the optical fiber vibration, and thus misjudgment is easily caused.
Disclosure of Invention
In view of the above-mentioned shortcomings or drawbacks of the prior art, it is desirable to provide a distributed optical fiber based vibration monitoring method and system.
In a first aspect, a distributed optical fiber-based vibration monitoring method is provided, which includes the following steps:
emitting laser into the vibrating optical fiber;
receiving the reflected laser signal in real time, and demodulating vibration signal data; the vibration signal data comprises vibration intensity and optical fiber position;
receiving weather information monitored by a weather monitoring module in real time; the meteorological information comprises wind power and rainfall;
judging whether the vibration intensity exceeds a preset value;
if not, judging that the perimeter security is in a normal state;
if the wind power or the rainfall exceeds the preset threshold value, further judging whether the wind power or the rainfall exceeds the preset threshold value;
if the wind power exceeds a preset threshold value, preliminarily judging that the vibration of the corresponding optical fiber position is caused by strong wind;
if the rainfall exceeds a preset threshold value, preliminarily judging that the vibration of the corresponding optical fiber position is caused by heavy rain;
if both the wind power and the rainfall exceed the preset threshold value, judging that the vibration of the corresponding optical fiber position is caused by strong wind and strong rain;
and if the wind power and the rainfall do not exceed the preset threshold value, judging that the corresponding optical fiber position is invaded, and giving an alarm.
According to the technical scheme provided by the embodiment of the application, after preliminarily judging that the vibration of the corresponding optical fiber position is caused by heavy rain or heavy rain, performing remote rechecking; if the retest finds that the optical fiber is abnormal, the intrusion of the corresponding optical fiber position is judged, and an alarm is given out.
According to the technical scheme provided by the embodiment of the application, a narrow linewidth laser is adopted to emit narrow linewidth laser;
modulating the narrow linewidth laser into pulse light and reference light;
injecting pulse light into the vibrating optical fiber;
and collecting backward Rayleigh scattering signals returned from the vibrating optical fiber, and demodulating the signals after the backward Rayleigh scattering signals are subjected to coherent processing with reference light.
According to the technical scheme provided by the embodiment of the application, pulsed light is amplified; and injecting the amplified pulse light into the vibration optical fiber.
In a second aspect, there is provided a distributed optical fiber based vibration monitoring system comprising:
the vibration optical fiber is laid around the boundary of the monitoring area;
a vibration detection module comprising: the narrow-linewidth laser is connected with the vibration optical fiber and is used for emitting laser into the vibration optical fiber; the signal collector is connected with the vibration optical fiber and used for receiving the returned laser signal;
the meteorological monitoring module comprises a meteorological sensor and is used for monitoring meteorological information;
a data processing module comprising: the data receiving unit is respectively connected with the meteorological sensor and the signal collector and is used for receiving meteorological information and laser signals and demodulating vibration signal data from the laser signals; the vibration optical signal data comprises vibration intensity and optical fiber position, and the meteorological information comprises wind power and rainfall; the data analysis unit is connected with the data receiving unit and used for judging whether the vibration intensity exceeds a preset value or not;
if not, judging that the perimeter security is in a normal state;
if the wind power or the rainfall exceeds the preset threshold value, further judging whether the wind power or the rainfall exceeds the preset threshold value;
if the wind power exceeds a preset threshold value, preliminarily judging that the vibration of the corresponding optical fiber position is caused by strong wind;
if the rainfall exceeds a preset threshold value, preliminarily judging that the vibration of the corresponding optical fiber position is caused by heavy rain;
if both the wind power and the rainfall exceed the preset threshold value, judging that the vibration of the corresponding optical fiber position is caused by strong wind and strong rain;
and if the wind power and the rainfall do not exceed the preset threshold value, judging that the corresponding optical fiber position is invaded, and giving an alarm.
According to the technical scheme provided by the embodiment of the application, the vibration detection module further comprises: and the acousto-optic modulator is connected with the narrow linewidth laser and is used for modulating the narrow linewidth laser into pulse light and reference light.
According to the technical scheme provided by the embodiment of the application, the vibration detection module further comprises: one end of the optical fiber amplifier is connected with the acousto-optic modulator, and the other end of the optical fiber amplifier is connected with the vibration optical fiber and used for amplifying the pulse light; the signal collector is used for collecting backward Rayleigh scattering signals returned from the vibrating optical fiber; the data receiving unit is also used for carrying out signal demodulation after the backward Rayleigh scattering signal and the reference light are subjected to coherent processing.
According to the technical scheme provided by the embodiment of the application, the vibration optical fiber is an armored optical fiber.
The invention has the beneficial effects that:
the vibration detection system of the distributed optical fiber can be used for monitoring the vibration conditions around the optical fiber in real time, on line and continuously, and eliminating the interference of strong wind and rain on the vibration monitoring of the optical fiber by combining meteorological information, so that the accuracy of the vibration detection system based on the distributed optical fiber on perimeter security detection is improved, and the vibration detection system can be effectively applied to perimeter security and monitoring the perimeter security of important areas such as airports, railways, border lines and the like.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a block diagram illustrating a structure of a vibration monitoring system according to the present application.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example one
A vibration monitoring method based on a distributed optical fiber comprises the following steps:
emitting laser into the vibrating optical fiber;
receiving the reflected laser signal in real time, and demodulating vibration signal data; the vibration signal data comprises vibration intensity and optical fiber position;
receiving weather information monitored by a weather monitoring module in real time; the meteorological information comprises wind power and rainfall;
judging whether the vibration intensity exceeds a preset value;
if not, judging that the perimeter security is in a normal state;
if the wind power or the rainfall exceeds the preset threshold value, further judging whether the wind power or the rainfall exceeds the preset threshold value;
if the wind power exceeds a preset threshold value, preliminarily judging that the vibration of the corresponding optical fiber position is caused by strong wind;
if the rainfall exceeds a preset threshold value, preliminarily judging that the vibration of the corresponding optical fiber position is caused by heavy rain;
if both the wind power and the rainfall exceed the preset threshold value, judging that the vibration of the corresponding optical fiber position is caused by strong wind and strong rain;
and if the wind power and the rainfall do not exceed the preset threshold value, judging that the corresponding optical fiber position is invaded, and giving an alarm.
Specifically, the vibration optical fiber is adopted as a vibration detection sensor, the vibration optical fiber is easy to lay and arrange, is slightly influenced by terrain and terrain environment, can be freely laid on airport, railway and border lines, is simple to lay and also used as a carrier for light propagation, and the positions of detection points are distributed, so that the detection of the peripheral vibration of the optical fiber is real-time, online and continuous, and simultaneously supports multi-point monitoring, and the monitoring points are not interfered with each other.
Specifically, the intensity difference between the laser emission and the laser reception is recorded, and the vibration intensity can be obtained; the time difference between the time of laser emission and the time of receiving the return laser signal is recorded, and the position of the optical fiber can be calculated according to the propagation speed of light in the optical fiber.
The distributed optical fiber vibration detection method can be used for monitoring the vibration conditions around the optical fiber in real time, on line and continuously, and eliminating the interference of strong wind and rain on the optical fiber vibration monitoring by combining meteorological information, for example, when the vibration intensity of the vibrating optical fiber caused by extreme weather such as strong wind and rain exceeds a preset value, a misjudgment alarm can be sent out; and this application has set up the meteorological monitoring module simultaneously and has monitored meteorological information, after judging that vibration intensity surpasss the default, further judge the meteorological information condition, for example wind-force and rainfall exceed and predetermine the threshold value, if exceed and predetermine the threshold value, then can regard as the misjudgment that meteorological reason leads to, just so promote the vibration detection system based on distributed optical fiber to the rate of accuracy that perimeter security protection detected, but effective application in perimeter security protection monitors the perimeter safety of important areas such as airport, railway, border line.
In one embodiment of the application, after preliminarily judging that the vibration of the corresponding optical fiber position is caused by heavy rain or heavy rain, performing remote rechecking; if the anomaly is found by retesting, the intrusion at the corresponding optical fiber position is judged, and an alarm is given.
Specifically, meteorological information is monitored simultaneously, and misjudgment caused by weather is reduced; meanwhile, after the vibration of the corresponding optical fiber position is detected to be caused by heavy rain or heavy rain, remote recheck is needed to avoid wrong invasion. The remote rechecking mode can be other modes, such as remote monitoring.
In one embodiment of the present application, a narrow linewidth laser is used to emit narrow linewidth laser light;
modulating the narrow linewidth laser into pulse light and reference light;
injecting pulsed light into the vibrating optical fiber;
and collecting backward Rayleigh scattering signals returned from the vibrating optical fiber, and demodulating the signals after the backward Rayleigh scattering signals are subjected to coherent processing with reference light.
Specifically, narrow linewidth laser phase noise is relatively low; the pulsed light is injected into the vibration optical fiber and is mainly used for monitoring and testing, and the reference light is used for reference and is demodulated to obtain vibration signal data after being subjected to coherent processing with the returned backward Rayleigh scattering signals.
Because this application adopts the high coherent pulsed light source, can take place to interfere between the rayleigh scattered light signal in the pulse width region, can make the coherent rayleigh scattered light signal intensity of this point change when external vibration leads to the phase place to change, through monitoring the intensity change of the rayleigh scattered light signal before and after the vibration, can realize the detection of vibration incident to accurate positioning.
In one embodiment of the present application, pulsed light is amplified;
and injecting the amplified pulse light into the vibration optical fiber.
Specifically, the light intensity of the pulse light is amplified and then transmitted in the vibration optical fiber, and the monitoring distance can be increased after the pulse light is amplified.
Example two
A distributed optical fiber based vibration monitoring system comprising:
the vibration optical fiber is laid around the boundary of the monitoring area;
a vibration detection module comprising: the narrow-linewidth laser is connected with the vibration optical fiber and is used for emitting laser into the vibration optical fiber; the signal collector is connected with the vibration optical fiber and used for receiving the returned laser signal;
the meteorological monitoring module comprises a meteorological sensor and is used for monitoring meteorological information;
a data processing module comprising: the data receiving unit is respectively connected with the meteorological sensor and the signal collector and is used for receiving meteorological information and laser signals and demodulating vibration signal data from the laser signals; the vibration optical signal data comprises vibration intensity and optical fiber position, and the meteorological information comprises wind power and rainfall; the data analysis unit is connected with the data receiving unit and used for judging whether the vibration intensity exceeds a preset value or not;
if not, judging that the perimeter security is in a normal state;
if the wind power or the rainfall exceeds the preset threshold value, further judging whether the wind power or the rainfall exceeds the preset threshold value;
if the wind power exceeds a preset threshold value, preliminarily judging that the vibration of the corresponding optical fiber position is caused by strong wind;
if the rainfall exceeds a preset threshold value, preliminarily judging that the vibration of the corresponding optical fiber position is caused by heavy rain;
if both the wind power and the rainfall exceed the preset threshold value, judging that the vibration of the corresponding optical fiber position is caused by strong wind and strong rain;
and if the wind power and the rainfall do not exceed the preset threshold value, judging that the corresponding optical fiber position is invaded, and giving an alarm.
Referring to fig. 1 specifically, the vibration detection system of the distributed optical fiber according to the present application is provided with the vibrating optical fiber, which can perform real-time, online, and continuous monitoring on the vibration condition around the optical fiber, and is further provided with the weather monitoring module, which can eliminate the interference of strong wind and rain on the vibration monitoring of the optical fiber in combination with weather information, for example, when the vibration intensity of the vibrating optical fiber caused by extreme weather, such as strong wind and rain, exceeds a preset value, a false judgment alarm is sent; and this application monitors vibration and meteorological information simultaneously, after judging that vibration intensity surpasses the default, further judges the meteorological information condition, for example wind-force and rainfall whether surpass and predetermine the threshold value, if surpass and predetermine the threshold value, then can regard as the misjudgment that meteorological reason leads to, just so promotes the vibration detection system based on distributed optical fiber to the rate of accuracy that the perimeter security protection detected, can effectively be applied to perimeter security protection, monitoring important regional perimeter safety such as airport, railway, border line.
The weather monitoring module comprises a weather monitor, the model of the weather monitor can be FT-CQX, wind power and rain amount information is directly monitored, and the information is sent to the data receiving unit.
The data processing module can be an upper computer, is connected with the vibration measuring module through a USB interface, is connected with the meteorological monitoring module through an RJ45 interface, receives laser signals and synchronously receives meteorological information, and presents perimeter security protection information.
In an embodiment of the present application, the vibration detection module further includes:
and the acousto-optic modulator is connected with the narrow linewidth laser and is used for modulating the narrow linewidth laser into pulse light and reference light.
Specifically, the laser is modulated into the pulse light and the reference light, the reference light and the returned subsequent Rayleigh scattering signals are coherent, and the measured signals are more accurate, so that the measurement with higher precision can be realized.
In an embodiment of the present application, the vibration detection module further includes:
one end of the optical fiber amplifier is connected with the acousto-optic modulator, and the other end of the optical fiber amplifier is connected with the vibration optical fiber and used for amplifying the pulse light;
the signal collector is used for collecting backward Rayleigh scattering signals returned from the vibrating optical fiber;
the data receiving unit is also used for carrying out signal demodulation after the backward Rayleigh scattering signal and the reference light are subjected to coherent processing.
Specifically, the optical fiber amplifier is arranged to amplify the light intensity of the pulse light, the light intensity of the pulse light is transmitted in the vibration optical fiber after being amplified, and the monitoring distance can be increased after the pulse light is amplified.
In an embodiment of the present application, the vibration optical fiber is an armored optical fiber.
Specifically, the armored single-mode optical fiber supports long-distance transmission, the optical cable structure is well-arranged, bare optical fibers are protected inside one steel pipe and are in a free state and sensitive to peripheral vibration induction, meanwhile, the armored optical fiber has high durability and strong anti-corrosion capability, is suitable for working in various environments, and can reach 30 years in service life.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention according to the present application is not limited to the specific combination of the above-mentioned features, but also covers other embodiments where any combination of the above-mentioned features or their equivalents is made without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (8)
1. A vibration monitoring method based on a distributed optical fiber is characterized by comprising the following steps:
emitting laser into the vibrating optical fiber;
receiving the reflected laser signal in real time, and demodulating vibration signal data; the vibration signal data comprises vibration intensity and optical fiber position;
receiving weather information monitored by a weather monitoring module in real time; the meteorological information comprises wind power and rainfall;
judging whether the vibration intensity exceeds a preset value;
if not, judging that the perimeter security is in a normal state;
if the wind power or the rainfall exceeds the preset threshold value, further judging whether the wind power or the rainfall exceeds the preset threshold value;
if the wind power exceeds a preset threshold value, preliminarily judging that the vibration of the corresponding optical fiber position is caused by strong wind;
if the rainfall exceeds a preset threshold value, preliminarily judging that the vibration of the corresponding optical fiber position is caused by heavy rain;
if both the wind power and the rainfall exceed the preset threshold, judging that the vibration of the corresponding optical fiber position is caused by strong wind and strong rain;
and if the wind power and the rainfall do not exceed the preset threshold value, judging that the corresponding optical fiber position is invaded, and giving an alarm.
2. The vibration monitoring method based on the distributed optical fiber according to claim 1, wherein after preliminarily judging that the vibration of the corresponding optical fiber position is caused by heavy rain or heavy rain, remote rechecking is performed; if the retest finds that the optical fiber is abnormal, the intrusion of the corresponding optical fiber position is judged, and an alarm is given out.
3. The distributed optical fiber-based vibration monitoring method according to claim 1,
emitting narrow linewidth laser by adopting a narrow linewidth laser;
modulating the narrow linewidth laser into pulse light and reference light;
injecting pulsed light into the vibrating optical fiber;
and collecting backward Rayleigh scattering signals returned from the vibrating optical fiber, and demodulating the signals after the backward Rayleigh scattering signals are subjected to coherent processing with reference light.
4. The distributed optical fiber-based vibration monitoring method according to claim 3,
amplifying the pulsed light;
and injecting the amplified pulse light into the vibration optical fiber.
5. A distributed optical fiber based vibration monitoring system, comprising:
the vibration optical fiber is laid around the boundary of the monitoring area;
a vibration detection module comprising: the narrow-linewidth laser is connected with the vibration optical fiber and is used for emitting laser into the vibration optical fiber; the signal collector is connected with the vibration optical fiber and used for receiving the returned laser signal;
the meteorological monitoring module comprises a meteorological sensor and is used for monitoring meteorological information;
a data processing module comprising: the data receiving unit is respectively connected with the meteorological sensor and the signal collector and is used for receiving meteorological information and laser signals and demodulating vibration signal data from the laser signals; the vibration optical signal data comprises vibration intensity and optical fiber position, and the meteorological information comprises wind power and rainfall; the data analysis unit is connected with the data receiving unit and used for judging whether the vibration intensity exceeds a preset value or not;
if not, judging that the perimeter security is in a normal state;
if the wind power or the rainfall exceeds the preset threshold value, further judging whether the wind power or the rainfall exceeds the preset threshold value;
if the wind power exceeds a preset threshold value, preliminarily judging that the vibration of the corresponding optical fiber position is caused by strong wind;
if the rainfall exceeds a preset threshold value, preliminarily judging that the vibration of the corresponding optical fiber position is caused by heavy rain;
if both the wind power and the rainfall exceed the preset threshold value, judging that the vibration of the corresponding optical fiber position is caused by strong wind and strong rain;
and if the wind power and the rainfall do not exceed the preset threshold value, judging that the corresponding optical fiber position is invaded, and giving an alarm.
6. The distributed fiber optic-based vibration monitoring system of claim 5, wherein the vibration detection module further comprises:
and the acousto-optic modulator is connected with the narrow linewidth laser and is used for modulating the narrow linewidth laser into pulse light and reference light.
7. The distributed fiber optic-based vibration monitoring system of claim 6, wherein the vibration detection module further comprises:
one end of the optical fiber amplifier is connected with the acousto-optic modulator, and the other end of the optical fiber amplifier is connected with the vibration optical fiber and used for amplifying the pulse light;
the signal collector is used for collecting backward Rayleigh scattering signals returned from the vibrating optical fiber;
the data receiving unit is also used for carrying out signal demodulation after the backward Rayleigh scattering signal and the reference light are subjected to coherent processing.
8. A distributed optical fiber based vibration monitoring system according to claim 5 wherein said vibrating optical fiber is an armored optical fiber.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118687672A (en) * | 2024-06-12 | 2024-09-24 | 国网青海省电力公司电力科学研究院 | A method, device and equipment for remote monitoring of resonance fracture of equalizing ring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118687672A (en) * | 2024-06-12 | 2024-09-24 | 国网青海省电力公司电力科学研究院 | A method, device and equipment for remote monitoring of resonance fracture of equalizing ring |
| CN118687672B (en) * | 2024-06-12 | 2025-01-24 | 国网青海省电力公司电力科学研究院 | A method, device and equipment for remote monitoring of resonance fracture of equalizing ring |
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