CN214410234U - Surge monitoring device based on distributed optical fiber sensing technology - Google Patents
Surge monitoring device based on distributed optical fiber sensing technology Download PDFInfo
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Abstract
A surge monitoring device based on a distributed optical fiber sensing technology comprises a buoy, an armored disturbance monitoring optical cable, a mass block, an optical fiber demodulation system and a signal transmission optical cable, wherein the armored disturbance monitoring optical cable is connected with the buoy and the mass block, the signal transmission optical cable is connected with the armored disturbance monitoring optical cable and the optical fiber demodulation system, a connecting cable and a rock-soil body anchor are connected in series with a plurality of buoys, the buoy floats in a water area of a potential landslide, the mass block is suspended in the water, the optical fiber demodulation system is used for demodulating signals in the armored disturbance monitoring optical cable, and when a surge occurs, a monitoring signal threshold value is compared with a monitoring alarm threshold value through the optical fiber demodulation system. The problem of former surge monitoring utilize the water level meter point formula monitoring can't measure inside the water and its distribution characteristic, underestimate the harm of underwater undercurrent amplitude to the coastal is solved. The device has the characteristics of simple structure, on-line real-time monitoring and early warning of surge disasters, and simple and convenient operation.
Description
Technical Field
The utility model belongs to the technical field of the monitoring of surging, a monitoring devices surges based on distributed optical fiber sensing technique is related to.
Background
Landslide surge is a secondary disaster accompanying bank landslide, and is mainly waves generated by sudden sliding of slope rock-soil bodies or river immersed rock-soil bodies and interaction with a water body. Serious disasters can be caused by the occurrence of landslide surge, if the landslide surge impacts the dam body of the reservoir, cracks are generated on the dam body, and the dam body breaks, so that the life and property safety of residents along the bank is damaged; landslide and surge are the second major causes of tsunami generation, the damage degree of which is sometimes not inferior to that of tsunami induced by earthquake, and the navigation safety of ships passing through water areas due to surge can be seriously threatened.
The existing research on surge mostly focuses on empirical formulas, physical models and numerical simulation, and scholars want to show the occurrence process and propagation rules of surge through the research method. However, the method of monitoring and warning of swell is still rare. The existing surge monitoring method mainly utilizes a water level meter to measure the wave height and the wave direction of the surge. However, the water level meter is generally used for measuring the water surface wave height, belongs to point type monitoring, and cannot measure the internal dark current of the water body and the distribution characteristics thereof, so that the amplitude of the dark current in the water and the damage of the dark current to the coastal are underestimated.
Disclosure of Invention
The utility model aims to solve the technical problem that a monitoring devices surges based on distributed optical fiber sensing technique is provided, moreover, the steam generator is simple in structure, adopt armor disturbance monitoring optical cable and buoy and quality piece to be connected, the signal transmission optical cable is connected with armor disturbance monitoring optical cable and optical fiber demodulation system, the connecting cable establishes ties a plurality of buoys with the ground body anchor, the buoy floats in the waters of potential landslide, the quality piece dangles in the aquatic, optical fiber demodulation system is arranged in the signal demodulation of armor disturbance monitoring optical cable, when surging and taking place, optical fiber demodulation system compares the monitoring signal threshold value with the monitoring alarm threshold value, carry out online real-time supervision and early warning to the calamity of surging, and easy operation is convenient.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: a surge monitoring device based on a distributed optical fiber sensing technology comprises a buoy, an armored disturbance monitoring optical cable, a mass block, an optical fiber demodulation system and a signal transmission optical cable; two ends of the armored disturbance monitoring optical cable are respectively connected with the buoy and the mass block, the signal transmission optical cable is connected with the armored disturbance monitoring optical cable and the optical fiber demodulation system, and the mass block is perpendicular to the buoy and is positioned at the lower part of the buoy; the buoy floats on the water surface, the mass block is suspended in the water, and the optical fiber demodulation system is used for demodulating signals in the armored disturbance monitoring optical cable.
The buoy is of a cone frustum structure, the cone top with a smaller cross section faces the mass block, and the armored disturbance monitoring optical cable is connected with the center of the cone frustum.
The mass block is a cylinder with a conical tip at one end, and the armored disturbance monitoring optical cable is connected with the conical tip.
The buoy is provided with a plurality of buoys which are connected in series by connecting cables, and anchors are arranged at two ends of the connecting cables.
And a plurality of armored disturbance monitoring optical cables connected with the buoys are connected with the signal transmission optical cable.
The armored disturbance monitoring optical cable is acted by a water flow load q in the horizontal direction and is acted by a tension T of a surge monitoring device in the vertical direction1Tension T of anchor2And the gravity G of the cable, the acting force q of the water flow on the optical cable is as follows,
wherein, T1、T2And G is a balance force, which does not generate disturbance to the armored disturbance monitoring optical cable, wherein C isdIs the drag coefficient; rho is the water flow density; v is the water flow rate; and A is the area of the cross section of the water flow flowing through the armored disturbance monitoring optical cable.
And the armoured disturbance monitoring optical cable is subjected to surge disturbance signals, demodulated by a phi-OTDR optical cable light intensity signal demodulator, and a disturbance event is monitored by injecting a high-coherence light source into the armoured disturbance monitoring optical cable and detecting the light intensity change of backward Rayleigh scattering light.
The disturbing signal of the armored disturbing monitoring optical cable realizes the on-line real-time monitoring of the position and time of the disturbance occurrence by setting the alarm threshold value of the demodulator,
in the formula, I is the light intensity detected by the demodulator; a is the amplitude of scattered light; λ is the wavelength of the light wave; n isfIs the refractive index of the optical fiber; c is the speed of light in the fiber; t isPIs the optical pulse width.
A surge monitoring device based on a distributed optical fiber sensing technology comprises a buoy, an armored disturbance monitoring optical cable, a mass block, an optical fiber demodulation system and a signal transmission optical cable; two ends of the armored disturbance monitoring optical cable are respectively connected with the buoy and the mass block, the signal transmission optical cable is connected with the armored disturbance monitoring optical cable and the optical fiber demodulation system, and the mass block is perpendicular to the buoy and is positioned at the lower part of the mass block; the buoy floats on the water surface, the mass block is suspended in the water, and the optical fiber demodulation system is used for demodulating signals in the armored disturbance monitoring optical cable. Simple structure, be connected through armor disturbance monitoring optical cable and buoy and quality piece, the signal transmission optical cable is connected with armor disturbance monitoring optical cable and optic fibre demodulation system, the connecting cable establishes ties a plurality of buoys with ground body anchor, the buoy floats in the waters of potential landslide, the quality piece suspends in aqueous, optic fibre demodulation system is arranged in the demodulation of signals of armor disturbance monitoring optical cable, when the surge takes place, compare monitoring signal threshold value and monitoring alarm threshold value through optic fibre demodulation system, carry out online real-time supervision and early warning to the calamity of surging, easy operation is convenient.
In a preferred scheme, the buoy is of a cone frustum structure, a cone top with a smaller cross section faces the mass block, and the armored disturbance monitoring optical cable is connected with the center of the cone frustum. Simple structure, during the use, the buoy floats on the surface of water, and the quality piece of being connected with the buoy hangs in the aquatic and plays stabilizing effect, and armor disturbance monitoring optical cable is connected with the buoy of circular truncated cone structure, and the resistance is little when the rivers strike, and stability is good.
In a preferred scheme, the mass block is a cylinder with a conical tip at one end, and the armored disturbance monitoring optical cable is connected with the conical tip. Simple structure, during the use, the quality piece is cylinder awl point structure, and the awl point is connected with armor disturbance monitoring optical cable, hangs in aquatic stability good.
In a preferred embodiment, the buoy is provided in a plurality, and is connected in series by a connecting cable, and anchors are provided at both ends of the connecting cable. The anchor block is simple in structure, when the anchor block is used, the anchor blocks at the two ends of the connecting cable are anchored with a rock soil body, and a plurality of buoys connected in series on the connecting cable float in a potential landslide water area.
In a preferred embodiment, a plurality of buoy-connected armored disturbance monitoring cables are connected to the signal transmission cable. Simple structure, during the use, adopt a plurality of armor disturbance monitoring optical cables of being connected with signal transmission optical cable to monitor the surge signal in potential waters, its area of coverage is big, and it is little to record data error.
In the preferred scheme, the armored disturbance monitoring optical cable is subjected to the action of water flow load q in the horizontal direction and is subjected to the tension T of the surge monitoring device in the vertical direction1Tension T of anchor2And the gravity G of the water flow, the acting force q of the water flow to the optical cable is as follows,
wherein, T1、T2And G is a balance force, which does not generate disturbance to the armored disturbance monitoring optical cable, wherein C isdIs the drag coefficient; rho is the water flow density; v is the water flow rate; and A is the area of the cross section of the water flow flowing through the armored disturbance monitoring optical cable.
In the preferred scheme, the surge disturbance signal of the armored disturbance monitoring optical cable is demodulated by a phi-OTDR optical cable light intensity signal demodulator, a high-coherence light source is injected into the armored disturbance monitoring optical cable, and the light intensity change of backward Rayleigh scattering light is detected to monitor the disturbance event.
In the preferred scheme, the disturbance signal of the armored disturbance monitoring optical cable realizes the online real-time monitoring of the position and time of the disturbance occurrence by setting the alarm threshold value of the demodulator,
in the formula, I is the light intensity detected by the demodulator; a is the amplitude of scattered light; λ is the wavelength of the light wave; n isfIs the refractive index of the optical fiber; c is the speed of light in the fiber; t isPIs the optical pulse width.
A surge monitoring device based on a distributed optical fiber sensing technology comprises a buoy, an armored disturbance monitoring optical cable, a mass block, an optical fiber demodulation system and a signal transmission optical cable, wherein the armored disturbance monitoring optical cable is connected with the buoy and the mass block, the signal transmission optical cable is connected with the armored disturbance monitoring optical cable and the optical fiber demodulation system, a connecting cable and a rock-soil body anchor are connected in series with a plurality of buoys, the buoy floats in a water area of a potential landslide, the mass block is suspended in the water, the optical fiber demodulation system is used for demodulating signals in the armored disturbance monitoring optical cable, and when a surge occurs, a monitoring signal threshold value is compared with a monitoring alarm threshold value through the optical fiber demodulation system. The problem of former surge monitoring utilize the water level meter point formula monitoring can't measure inside the water and its distribution characteristic, underestimate the harm of underwater undercurrent amplitude to the coastal is solved. The device has the characteristics of simple structure, on-line real-time monitoring and early warning of surge disasters, and simple and convenient operation.
Drawings
The invention will be further explained with reference to the following figures and examples:
fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a force analysis diagram of the present invention.
Fig. 3 is a usage state diagram of the present invention.
Fig. 4 is a signal diagram of the present invention when no surge occurs and when surge occurs.
In the figure: the device comprises a buoy 1, an armored disturbance monitoring optical cable 2, a mass block 3, an optical fiber demodulation system 4, a signal transmission optical cable 5 and a connecting cable 6.
Detailed Description
As shown in fig. 1 to 4, a surge monitoring device based on distributed optical fiber sensing technology includes a buoy 1, an armored disturbance monitoring optical cable 2, a mass block 3, an optical fiber demodulation system 4, and a signal transmission optical cable 5; two ends of the armored disturbance monitoring optical cable 2 are respectively connected with the buoy 1 and the mass block 3, the signal transmission optical cable 5 is connected with the armored disturbance monitoring optical cable 2 and the optical fiber demodulation system 4, and the mass block 3 is perpendicular to the buoy 1 and is positioned at the lower part of the buoy; the buoy 1 floats on the water surface, the mass block 3 is suspended in the water, and the optical fiber demodulation system 4 is used for demodulating signals in the armored disturbance monitoring optical cable 2. Simple structure, be connected with buoy 1 and quality piece 3 through armor disturbance monitoring optical cable 2, signal transmission optical cable 5 is connected with armor disturbance monitoring optical cable 2 and optic fibre demodulation system 4, connecting cable 6 and ground body anchor series connection a plurality of buoys 1, buoy 1 floats in the waters of potential landslide, quality piece 3 dangles in the aquatic, optic fibre demodulation system 4 is arranged in armor disturbance monitoring optical cable 2 signal demodulation, when surging takes place, compare monitoring signal threshold value and monitoring alarm threshold value through optic fibre demodulation system 4, carry out online real-time supervision and early warning to the calamity of surging, and easy operation is convenient.
In the preferred scheme, the buoy 1 is of a cone frustum structure, the cone top with a smaller cross section faces the mass block 3, and the armored disturbance monitoring optical cable 2 is connected with the center of the cone frustum. Simple structure, during the use, buoy 1 floats on the surface of water, and the quality piece 3 of being connected with buoy 1 hangs and plays stabilizing effect in the aquatic, and armor disturbance monitoring optical cable 2 is connected with buoy 1 of circular truncated cone structure, and the resistance is little when the rivers impact, and stability is good.
In a preferred scheme, the mass block 3 is a cylinder with a conical tip at one end, and the armored disturbance monitoring optical cable 2 is connected with the conical tip. Simple structure, during the use, quality piece 3 is cylinder awl point structure, and the awl point is connected with armor disturbance monitoring optical cable 2, hangs in aquatic stability good.
In a preferred embodiment, the buoy 1 is provided in a plurality, and is connected in series by a connecting cable 6, and anchors are provided at both ends of the connecting cable 6. The structure is simple, when in use, the anchors at the two ends of the connecting cable 6 are anchored with rock soil, and the plurality of buoys 1 which are arranged on the connecting cable 6 in series float in a potential landslide water area.
In a preferred scheme, a plurality of armored disturbance monitoring optical cables 2 connected with the buoys 1 are connected with a signal transmission optical cable 5. Simple structure, during the use, adopt a plurality of armor disturbance monitoring optical cables 2 of being connected with signal transmission optical cable 5 to monitor the surge signal of potential waters, its area of coverage is big, and it is little to record data error.
In the preferred scheme, the armored disturbance monitoring optical cable 2 is acted by a water flow load q in the horizontal direction and is acted by a tension T of a surge monitoring device in the vertical direction1Tension T of anchor2And the gravity G of the cable, the acting force q of the water flow on the optical cable is as follows,
wherein, T1、T2And G is a balance force, which does not generate disturbance to the armored disturbance monitoring optical cable 2, wherein C isdIs the drag coefficient; rho is the water flow density; v is the water flow rate; and A is the area of the cross section of the water flow flowing through the armored disturbance monitoring optical cable 2.
In the preferred scheme, the surge disturbance signal of the armored disturbance monitoring optical cable 2 is demodulated by a phi-OTDR optical cable light intensity signal demodulator, a high-coherence light source is injected into the armored disturbance monitoring optical cable 2, and the light intensity change of backward Rayleigh scattering light is detected to monitor the disturbance event.
In the preferred scheme, the disturbance signal of the armored disturbance monitoring optical cable 2 realizes the online real-time monitoring of the position and time of the disturbance occurrence by setting the alarm threshold value of the demodulator,
in the formula, I is the light intensity detected by the demodulator; a is the amplitude of scattered light; lambda is lightA wavelength of the wave; n isfIs the refractive index of the optical fiber; c is the speed of light in the fiber; t isPIs the optical pulse width.
As above-mentioned surge monitoring devices based on distributed optical fiber sensing technology, when installing and using, armor disturbance monitoring optical cable 2 is connected with buoy 1 and quality piece 3, signal transmission optical cable 5 is connected with armor disturbance monitoring optical cable 2 and optical fiber demodulation system 4, connecting cable 6 and ground body anchor a plurality of buoys 1 of establishing ties, buoy 1 floats in the waters of potential landslide, quality piece 3 dangles in the water, optical fiber demodulation system 4 is arranged in the demodulation of signal in armor disturbance monitoring optical cable 2, when the surge takes place, optical fiber demodulation system 4 compares the monitoring signal threshold value with the monitoring alarm threshold value, carry out online real-time monitoring and early warning to the calamity of surge, and convenient operation.
When the monitoring device is used, the buoy 1 floats on the water surface, the mass block 3 connected with the buoy 1 is suspended in the water to play a stabilizing role, the armored disturbance monitoring optical cable 2 is connected with the buoy 1 with the cone frustum structure, the resistance is small when water flow impacts, and the stability is good.
During the use, quality piece 3 is cylinder awl point structure, and the awl point is connected with armor disturbance monitoring optical cable 2, hangs in aquatic stability good.
When in use, the anchors at the two ends of the connecting cable 6 are anchored with the rock soil body, and the plurality of buoys 1 which are arranged on the connecting cable 6 in series float in a potential landslide water area.
When the device is used, a plurality of armored disturbance monitoring optical cables 2 connected with the signal transmission optical cable 5 are adopted to monitor surge signals of potential water areas, the coverage area is large, and the measured data error is small.
The above embodiments are merely preferred technical solutions of the present invention, and should not be considered as limitations of the present invention, and the features in the embodiments and the examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be defined by the claims and the technical solutions described in the claims, including the technical features of the equivalent alternatives as the protection scope. Namely, equivalent alterations and modifications within the scope of the invention are also within the scope of the invention.
Claims (8)
1. A surge monitoring device based on distributed optical fiber sensing technology is characterized in that: the device comprises a buoy (1), an armored disturbance monitoring optical cable (2), a mass block (3), an optical fiber demodulation system (4) and a signal transmission optical cable (5); two ends of the armored disturbance monitoring optical cable (2) are respectively connected with the buoy (1) and the mass block (3), the signal transmission optical cable (5) is connected with the armored disturbance monitoring optical cable (2) and the optical fiber demodulation system (4), and the mass block (3) is perpendicular to the buoy (1) and is positioned at the lower part of the mass block; the buoy (1) floats on the water surface, the mass block (3) is suspended in the water, and the optical fiber demodulation system (4) is used for demodulating signals in the armored disturbance monitoring optical cable (2).
2. The surge monitoring device based on the distributed optical fiber sensing technology as claimed in claim 1, wherein: the buoy (1) is of a cone frustum structure, the cone top with a smaller cross section faces the mass block (3), and the armored disturbance monitoring optical cable (2) is connected with the center of the cone frustum.
3. The surge monitoring device based on the distributed optical fiber sensing technology as claimed in claim 1, wherein: the mass block (3) is a cylinder with a cone tip arranged at one end, and the armored disturbance monitoring optical cable (2) is connected with the cone tip.
4. The surge monitoring device based on the distributed optical fiber sensing technology as claimed in claim 1, wherein: the buoy comprises a plurality of buoys (1), wherein the buoys are connected in series through connecting cables (6), and anchors are arranged at two ends of the connecting cables (6).
5. The surge monitoring device based on the distributed optical fiber sensing technology as claimed in claim 4, wherein: and a plurality of armored disturbance monitoring optical cables (2) connected with the buoys (1) are connected with a signal transmission optical cable (5).
6. The surge monitoring device based on the distributed optical fiber sensing technology as claimed in claim 1, wherein: the armored disturbance monitoring optical cable (2) is subjected to the action of water flow load q in the horizontal direction and is subjected to surge monitoring in the vertical directionDevice tension T1Tension T of anchor2And the gravity G of the self body, the magnitude of the acting force q of the water flow to the optical cable is
Wherein, T1、T2And G is a balance force, which does not generate disturbance to the armored disturbance monitoring optical cable (2), wherein C isdIs the drag coefficient; rho is the water flow density; v is the water flow rate; a is the area of the cross section of the water flow flowing through the armored disturbance monitoring optical cable (2).
7. The surge monitoring device based on the distributed optical fiber sensing technology as claimed in claim 1, wherein: the armored disturbance monitoring optical cable (2) is subjected to demodulation of surge disturbance signals through a phi-OTDR optical cable light intensity signal demodulator, a high-coherence light source is injected into the armored disturbance monitoring optical cable (2), and the light intensity change of backward Rayleigh scattering light is detected to monitor disturbance events.
8. The surge monitoring device based on the distributed optical fiber sensing technology as claimed in claim 7, wherein: the disturbing signal of the armored disturbing monitoring optical cable (2) realizes the on-line real-time monitoring of the position and time of the disturbance occurrence by setting the alarm threshold value of the demodulator,
in the formula, I is the light intensity detected by the demodulator; a is the amplitude of scattered light; λ is the wavelength of the light wave; n isfIs the refractive index of the optical fiber; c is the speed of light in the fiber; t isPIs the optical pulse width.
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| CN202120230657.2U CN214410234U (en) | 2021-01-27 | 2021-01-27 | Surge monitoring device based on distributed optical fiber sensing technology |
| PCT/CN2021/142248 WO2022161083A1 (en) | 2021-01-27 | 2021-12-29 | Distributed optical fiber sensing technique-based device and method for swell monitoring |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112785815A (en) * | 2021-01-27 | 2021-05-11 | 哈尔滨工业大学 | Surge monitoring device and method based on distributed optical fiber sensing technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112785815A (en) * | 2021-01-27 | 2021-05-11 | 哈尔滨工业大学 | Surge monitoring device and method based on distributed optical fiber sensing technology |
| CN112785815B (en) * | 2021-01-27 | 2024-05-28 | 哈尔滨工业大学 | Surge monitoring device and method based on distributed optical fiber sensing technology |
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