CN114295177A - Distributed optical fiber-based roadway water level detection method - Google Patents
Distributed optical fiber-based roadway water level detection method Download PDFInfo
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- CN114295177A CN114295177A CN202111662223.0A CN202111662223A CN114295177A CN 114295177 A CN114295177 A CN 114295177A CN 202111662223 A CN202111662223 A CN 202111662223A CN 114295177 A CN114295177 A CN 114295177A
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Abstract
The invention discloses a distributed optical fiber-based roadway water level detection method, which comprises the following steps: 1) laying optical fibers on the wall of a mine roadway, wherein the optical fibers extend along the mine roadway in a sine wave or triangular wave shape in the roadway; 2) emitting a detection light pulse to the optical fiber through a light source device, and processing a reflected light pulse through a signal processing device to obtain a temperature change and optical fiber distance relation graph; 3) and selecting a temperature sudden change signal on the temperature change and optical fiber distance relation graph, judging the position of the optical fiber section generating the temperature sudden change signal in the mine roadway according to the temperature change and optical fiber distance relation graph, and calculating to obtain the water level of the corresponding position of the roadway. The invention can sense the global flood situation of the mine by the optical fiber which is arranged along the roadway of the mine and takes the shape of sine wave or triangular wave after the underground flood power failure occurs, can accurately judge the flood position, range and water level degree, and avoids the technical problem that the traditional coal mine flood monitoring device can not work after the underground power failure occurs.
Description
Technical Field
The invention relates to the technical field of water level detection, in particular to a method for detecting the post-disaster water level of a mine.
Background
Coal is an important strategic energy source, and coal mining frequency can be increased along with the fact that coal mining enters a deep part along with the fact that high-quality shallow buried coal seam mining is almost exhausted in coal mining.
At present, the monitoring of coal mine disasters is mainly inductive and point monitoring, but mine floods cause underground communication paralysis and power supply interruption, and monitoring equipment can lose the function, so that underground water conditions and the water level conditions of all roadways cannot be detected.
Disclosure of Invention
In view of the above, the present invention provides a method for detecting water level in a roadway based on distributed optical fibers, so as to solve the technical problem of detecting water level in the whole area of the roadway of a mine when a power supply of a flood is cut off.
The invention relates to a distributed optical fiber-based roadway water level detection method, which comprises the following steps:
1) laying optical fibers on the wall of the mine roadway, wherein the optical fibers extend along the mine roadway in a sine wave or triangular wave shape;
2) after the underground flood power failure occurs, transmitting a detection light pulse to the optical fiber through the light source device, and processing a reflected light pulse transmitted back by the optical fiber through the signal processing device to obtain a temperature change and optical fiber distance relation graph;
3) selecting a temperature mutation signal on the temperature change and optical fiber distance relation graph, and judging the position of an optical fiber section generating the temperature mutation signal in the mine roadway according to the temperature change and optical fiber distance relation graph:
the first condition is as follows: if the temperature jump signal is generated in the horizontal lane, the waveform starting point of the selected temperature jump signal corresponds toDistance L of optical fiber1Fiber distance L corresponding to waveform end point2By the formula L ═ L1-L2Calculating the length L of the optical fiber section on the roadway wall which generates the temperature mutation signal due to water submergence, and then obtaining the length L according to a formula
Calculating to obtain the water level height H of the roadway corresponding to the temperature mutation signal, wherein H is1The height h from the bottom of the tunnel to the bottom of the wave form of the optical fiber on the tunnel wall for generating the temperature jump signal2In order to generate the height from the bottom surface of the tunnel of the temperature sudden change signal to a reference plane with the water level of 0, theta is an arrangement inclination angle of the optical fiber on the wall of the tunnel;
case two: if the temperature jump signal is generated in the inclined tunnel, the optical fiber distance L corresponding to the waveform end point of the temperature jump signal3The optical fiber distance L corresponding to the lower end of the inclined tunnel4And according to formula L5＝(L3-L4) Calculating the length L of the submerged inclined roadway by the multiplied cos theta5Then according to formula H1＝L5×sinα+h3Obtaining the water level H in the inclined roadway1Alpha is the inclination angle of the inclined roadway relative to the horizontal plane, h3The height of the lower end of the inclined roadway from the datum plane with the water level of 0.
Furthermore, the wave crests of the optical fibers are arranged close to the top of the roadway, and the wave troughs of the optical fibers are arranged close to the bottom of the roadway.
The invention has the beneficial effects that:
according to the method for detecting the water level of the roadway based on the distributed optical fibers, after the underground flood power failure occurs, the global flood situation of the mine can be sensed through the optical fibers which are arranged along the roadway of the mine and are in the shape of sine waves or triangular waves, the flood position, the range and the water level degree can be accurately judged, and the technical problem that the existing coal mine flood monitoring device cannot work after the underground power failure is solved.
Drawings
Fig. 1 is a schematic perspective view of a distributed optical fiber-based roadway water level detection method.
FIG. 2 is a schematic diagram of optical fiber temperature sensing;
FIG. 3 is a graph of temperature change versus fiber distance obtained by the signal processing device;
fig. 4 is a schematic diagram of water level height calculation in a horizontal roadway.
Detailed Description
The embodiment of the method for detecting the roadway water level based on the distributed optical fiber comprises the following steps:
1) and arranging an optical fiber 1 on the wall of the mine roadway, wherein the optical fiber is in a sine wave or triangular wave shape and extends along the mine roadway.
2) After the underground flood power failure occurs, a detection light pulse is emitted to the optical fiber through the light source device 2, and a reflected light pulse transmitted back by the optical fiber is processed through the signal processing device 3, so that a relation graph of temperature change and optical fiber distance is obtained. The signal processing device 3 may select an existing distributed optical fiber temperature measurement system. The principle of detecting temperature using optical fibers is known, the basic principle being as follows:
wherein R (T) is a temperature change, IsAnd IasThe intensity of Stokes light and the intensity of anti-Stokes light respectively, h is Planck constant, k is Boltzmann constant, Deltav is Raman frequency shift, T is absolute temperature, Vs、VasThe scattering frequency of the stokes light and the scattering frequency of the anti-stokes light, respectively.
And then the relation between the temperature mutation signal and the optical fiber distance can be known according to the transmission time and the optical speed of the optical pulse.
3) Selecting a temperature mutation signal on the temperature change and optical fiber distance relation graph, and judging the position of an optical fiber section generating the temperature mutation signal in the mine roadway according to the temperature change and optical fiber distance relation graph:
the first condition is as follows: if the temperature jump signal is generated in the horizontal lane, the waveform of the selected temperature jump signal is usedStarting point corresponding optical fiber distance L1Fiber distance L corresponding to waveform end point2By the formula L ═ L1-L2Calculating the length L of the optical fiber section on the roadway wall which generates the temperature mutation signal due to water submergence, and then obtaining the length L according to a formula
Calculating to obtain the water level height H of the roadway corresponding to the temperature mutation signal, wherein H is1The height h from the bottom of the tunnel to the bottom of the wave form of the optical fiber on the tunnel wall for generating the temperature jump signal2In order to obtain the height from the water level 0 reference plane of the bottom surface of the tunnel generating the temperature jump signal, theta is the arrangement inclination angle of the optical fiber on the wall of the tunnel.
Case two: if the temperature jump signal is generated in the inclined tunnel, the optical fiber distance L corresponding to the waveform end point of the temperature jump signal3The optical fiber distance L corresponding to the lower end of the inclined tunnel4And according to formula L5＝(L3-L4) Calculating the length L of the submerged inclined roadway by the multiplied cos theta5Then according to formula H1＝L5×sinα+h3Obtaining the water level H in the inclined roadway1Alpha is the inclination angle of the inclined roadway relative to the horizontal plane, h3The height of the lower end of the inclined roadway from the datum plane with the water level of 0.
In this embodiment, the wave crests of the optical fibers are arranged near the top of the roadway, the wave troughs of the optical fibers are arranged near the bottom of the roadway, and the detection range is large. Of course, in particular implementations, the location of the peaks of the optical fibers from the top of the lane and the location of the valleys of the optical fibers from the bottom of the lane may be adjusted as desired.
In the method for detecting the water level of the roadway based on the distributed optical fiber in the embodiment, after the underground flood power failure occurs, the global flood situation of the mine can be sensed through the optical fiber which is arranged along the roadway of the mine and is in a sine wave or triangular wave shape, the flood position, the range and the water level degree can be accurately judged, and the technical problem that the existing coal mine flood monitoring device cannot work after the underground power failure is solved.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (2)
1. A roadway water level detection method based on distributed optical fibers is characterized in that: the method comprises the following steps:
1) laying optical fibers on the wall of a mine roadway, wherein the optical fibers extend along the mine roadway in a sine wave or triangular wave shape in the roadway;
2) after the underground flood power failure occurs, transmitting a detection light pulse to the optical fiber through the light source device, and processing a reflected light pulse transmitted back by the optical fiber through the signal processing device to obtain a temperature change and optical fiber distance relation graph;
3) selecting a temperature mutation signal on the temperature change and optical fiber distance relation graph, and judging the position of an optical fiber section generating the temperature mutation signal in the mine roadway according to the temperature change and optical fiber distance relation graph:
the first condition is as follows: if the temperature jump signal is generated in the horizontal roadway, the fiber distance L corresponding to the waveform starting point of the selected temperature jump signal1Fiber distance L corresponding to waveform end point2By the formula L ═ L1-L2Calculating the length L of the optical fiber section on the roadway wall which generates the temperature mutation signal due to water submergence, and then obtaining the length L according to a formula
Calculating to obtain the water level height H of the roadway corresponding to the temperature mutation signal, wherein H is1The height h from the bottom of the tunnel to the bottom of the wave form of the optical fiber on the tunnel wall for generating the temperature jump signal2In order to generate the height from the bottom surface of the tunnel of the temperature sudden change signal to a reference plane with the water level of 0, theta is an arrangement inclination angle of the optical fiber on the wall of the tunnel;
case two: if the temperature jump signal is generated in the inclined tunnel, the optical fiber distance L corresponding to the waveform end point of the temperature jump signal3The optical fiber distance L corresponding to the lower end of the inclined tunnel4And according to formula L5＝(L3-L4) Calculating the length L of the submerged inclined roadway by the multiplied cos theta5Then according to formula H1＝L5×sinα+h3Obtaining the water level H in the inclined roadway1Alpha is the inclination angle of the inclined roadway relative to the horizontal plane, h3The height of the lower end of the inclined roadway from the datum plane with the water level of 0.
2. The distributed optical fiber-based roadway level detection method of claim 1, wherein: the wave crests of the optical fibers are arranged close to the top of the roadway, and the wave troughs of the optical fibers are arranged close to the bottom of the roadway.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114673559A (en) * | 2022-05-27 | 2022-06-28 | 太原理工大学 | Real-time accurate monitoring method and system for mine permeable catastrophe information |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114673559A (en) * | 2022-05-27 | 2022-06-28 | 太原理工大学 | Real-time accurate monitoring method and system for mine permeable catastrophe information |
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