CN111307209A - Detection device for monitoring water leakage flow direction in underground water observation well - Google Patents
Detection device for monitoring water leakage flow direction in underground water observation well Download PDFInfo
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- CN111307209A CN111307209A CN202010114999.8A CN202010114999A CN111307209A CN 111307209 A CN111307209 A CN 111307209A CN 202010114999 A CN202010114999 A CN 202010114999A CN 111307209 A CN111307209 A CN 111307209A
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- detection device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention discloses a detection device for monitoring water leakage and flow direction in an underground water observation well, which comprises optical fibers (2), wherein a fixed ring (3) is arranged on the optical fibers (2), the fixed ring (3) comprises an inner ring and an outer ring which are connected, the optical fibers (2) are positioned between the inner ring and the outer ring, a light path closer (6) is arranged at the lower end of each optical fiber (2), a U-shaped optical fiber (7) is arranged in the light path closer (6), the U-shaped optical fibers (7) connect the tail ends of two adjacent optical fibers (2) to form a closed loop, an optical fiber coupler (4) is arranged at the front end of each optical fiber (2), an electronic compass (9) is arranged at the front end of each optical fiber coupler (4), and the front end of each electronic compass (9) is connected with a ground data processor (. The detection device for monitoring the water leakage flow direction in the underground water observation well, provided by the invention, has the advantages that the used water depth is deeper, the interference of the surrounding electromagnetic environment is avoided, and the data such as the water flow direction, the water temperature and the like of a detection area can be accurately determined.
Description
Technical Field
The invention relates to a detection device for monitoring the water leakage flow direction in an underground water observation well, and belongs to the technical field of hydrogeological parameter monitoring.
Background
The flow condition of underground water in an underground water monitoring well is an important means for knowing the hydrogeology. At present, the measuring method of underground water flow direction is more, and the traditional method mainly comprises a pumping test method and a tracing method. The traditional pumping test method is not suitable for single well monitoring and consumes time and labor. The tracing method includes a radioactive isotope tracing method, a potential difference method, a heat tracing method and the like. Radioactive substances required by the radioactive isotope tracing method may cause harm to human bodies and the environment. The tracer used in the tracing method can perform physical and chemical reactions such as ion exchange, adsorption, precipitation and the like with underground water and rock-soil mass, and the measuring result is influenced. And the accuracy requirement of the thermal tracing method on the thermosensitive element is higher. In addition, techniques such as neutron activation are also included, but the cost of neutron activation is high and protective measures are required.
Although the probe measures the flow direction of underground water in the prior art, the conventional common probe has shallow water depth and can only detect basic water quality information, and the practicability is not very strong. In addition, the common probe is easily interfered by the surrounding electromagnetic environment, and the accuracy is not very high.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a detection device for monitoring the water leakage flow direction in an underground water observation well, which has deeper use water depth, is not interfered by the surrounding electromagnetic environment and can accurately determine the data such as the water flow direction, the water temperature and the like of a detection area.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a detection device for monitoring of groundwater observation well internal water seepage flow direction, includes that even number strand is the optic fibre of annular setting, be provided with the retainer plate on the optic fibre, the retainer plate is including linking to each other inner circle and outer lane, optic fibre is located between inner circle and the outer lane, the lower extreme of optic fibre is provided with the light path closer, be provided with U-shaped optic fibre in the light path closer, U-shaped optic fibre will be adjacent two the optic fibre end-to-end connection forms closed circuit, the front end of optic fibre is provided with optical fiber coupler, optical fiber coupler's front end is provided with the electron compass, the front end of electron compass even has ground data processor through the optical cable.
The number of the fixed rings is 3.
And a counterweight is arranged at the bottom of the light path closer.
The number of strands of the optical fiber is 28.
And the outer ring is provided with a connecting interface, and the connecting interface on the fixed ring at the tail end is connected with the light path closer.
Two adjacent said retainer rings are connected together.
The invention has the beneficial effects that: the detection device for monitoring the water leakage flow direction in the underground water observation well realizes flow direction and flow velocity detection, does not need to carry out single-point monitoring one by one, and can monitor the water condition of dozens of meters along the line at one time. Meanwhile, the device is designed integrally, is simple to operate and convenient to carry, does not need complicated manpower and material resources for supporting, overcomes the defect that a common probe can only detect basic water quality information, and is convenient for accurately determining data such as water flow direction, water temperature and the like of a detection area; secondly, the problem that the common probe is relatively deep in water depth is solved; thirdly, the optical fiber measurement is not easily interfered by the surrounding electromagnetic environment and is more accurate and stable than a common probe; fourthly, the user can change the arrangement quantity of the internal optical fibers according to the requirement of the user, so that the precision is improved; fifthly, the device has simple structure, is easy and convenient to operate, can be folded and is convenient to carry.
Drawings
FIG. 1 is a schematic overall structure diagram of a detection device for monitoring water leakage flow direction in a groundwater observation well according to the present invention;
FIG. 2 is a schematic cross-sectional view of a detection device for monitoring the water leakage flow direction in an underground water observation well according to the present invention;
FIG. 3 is a schematic structural diagram of a detection device (two fixed rings are connected) for monitoring the water leakage flow direction in an underground water observation well according to the present invention;
fig. 4 is a schematic view of a storage structure of the detection device for monitoring the water leakage flow direction in the underground water observation well according to the present invention.
The reference numbers in the figures are as follows: the system comprises an optical cable 1, an optical fiber 2, a fixing ring 3, an optical fiber 4, a ground data processor 5, an optical path closer 6, a U-shaped optical fiber 7, a connection interface 8 and an electronic compass 9.
Detailed Description
The present invention is further described with reference to the accompanying drawings, and the following examples are only for clearly illustrating the technical solutions of the present invention, and should not be taken as limiting the scope of the present invention.
As shown in fig. 1 and 2, the present invention provides a detection device for monitoring the water leakage flow direction in a groundwater observation well, which comprises an even number of optical fibers 2 annularly arranged, wherein the number of the optical fibers is an even number, the total number of the optical fibers is dozens, the specific number is determined by the measurement accuracy required by a user, and the number of the optical fibers 2 is 28. The optical fibers 2 are arranged in a circle and fixed on 3 fixing rings, and the number of the fixing rings 3 is preferably 3. The fixed ring 3 comprises an inner ring and an outer ring which are connected, the optical fiber 2 is positioned between the inner ring and the outer ring, and a connecting interface 8 is arranged on the ring side of the fixed ring 3 and used for connecting the optical path closer 6. As shown in fig. 3, two fixing rings 3 may be connected, and a measuring section may be added to enlarge the measuring depth. The optical path closer 6 is arranged at the lower end of the optical fiber 2, the optical path closer 6 is buckled and connected with the tail-most fixing ring 3 through the connecting interface 8, so that every two adjacent optical fibers 2 form a closed optical path, the optical path closer 6 is used for balancing, and a counterweight is arranged at the bottom of the optical path closer 6, so that the device is kept stable in water as much as possible.
The optical path closer 6 is internally provided with a U-shaped optical fiber 7, and the U-shaped optical fiber 7 connects the tail ends of two adjacent optical fibers 2 to form a closed loop. The front end of the optical fiber 2 is provided with an optical fiber coupler 4, and the optical fiber coupler 4 is used for combining and splitting the optical fiber 2. An electronic compass 9 is arranged at the front end of the optical fiber coupler 4, and the electronic compass 9 is used for judging the water flow direction. The front end of the electronic compass 9 is connected with a ground data processor 5 through an optical cable 1. The surface data processor 5 is used for processing the light information and converting the light information into required data. The optical cable 1 is used for transmitting optical data and not used for monitoring data, the length of the optical cable 1 is determined by the underground water level, and the specific length is judged by a user.
As shown in fig. 4, the device of the present invention can be loaded in a box in an S-shape, has a small diameter, can be bent with a small curvature radius, has a high utilization rate of a storage space, and is convenient to carry.
The working process of the invention is as follows:
step one, preparation work before measurement. The various components of the device are mounted as shown in figures 1 and 2. Before measurement, each part is ensured to be installed in place, the buried depth of underground water to be measured is measured, the depth needing to be measured is confirmed, whether an optical fiber section needs to be added or not is determined (shown in figure 3), and measurement can be carried out after error-free inspection.
And step two, measuring data. The optical cable equipped with the present detection device is placed in the well until all the measuring fibers are submerged in the water. At the moment, the data of the underground water surface is measured at the topmost end of the optical fiber, the depth of the bottommost end is determined by the length of the optical fiber section used by a tester, and large data errors caused by bending of the optical fiber section due to the fact that the bottom of the optical fiber touches the bottom surface of the underground water are prevented.
The device works and measures data based on the optical fiber sensing technology, when the optical fiber is impacted by water flow at a certain point along the optical fiber, the optical fiber is strained, and a ground data processor processes and measures the strain of the optical fiber through measured frequency shift data, the light in the device is annularly arranged, the corresponding direction of the maximum strain generated on the strain distribution of the cross section is the position of the leak point, and the stress distribution on the vertical section represents the vertical range of the leak, wherein the related strain formula is vb (t) Vbo (1- α t)
Where G is the stress proportionality coefficient, vb (t) is the frequency shift at strain t, Vbo is the frequency shift at no strain, the frequency shift is dependent on the material used, α is a constant.
When seepage water flows, the temperature changes, and the temperature data obtained by processing the seepage water by the ground data processor can also be used as the basis for judging the water flow direction. More accurate flow conclusions can be obtained by comprehensively analyzing the strain and temperature data. The temperature data is obtained by the ratio of the number of stokes light photons to the number of anti-stokes light photons, and the formula is as follows:
T＝hΔf{ln(Is/Ias)+4ln[(f0+Δf)/(f0-Δf)]-1}/k
wherein h Is Planck constant, K Is Boltzmann constant, Is Stokes light intensity,ias is the anti-Stokes light intensity, f0△ f is the raman light frequency increase for the accompanying light frequency.
Finally, the directional data will be provided by an electronic compass.
And step four, after the measurement is finished, the device is taken out of the well, and is placed into a box in an S shape.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (6)
1. The utility model provides a detection device that is used for groundwater observation well water seepage flow direction to monitor which characterized in that: be the optic fibre (2) that the annular set up including the even number thigh, be provided with retainer plate (3) on optic fibre (2), retainer plate (3) are including linking to each other inner circle and outer lane, optic fibre (2) are located between inner circle and the outer lane, the lower extreme of optic fibre (2) is provided with light path closer (6), be provided with U-shaped optic fibre (7) in light path closer (6), U-shaped optic fibre (7) will be adjacent two optic fibre (2) end-to-end connection forms closed circuit, the front end of optic fibre (2) is provided with fiber coupler (4), the front end of fiber coupler (4) is provided with electron compass (9), the front end of electron compass (9) even has ground data processor (5) through optical cable (1).
2. A detection device for monitoring the direction of water seepage and flow in a groundwater observation well according to claim 1, wherein: the number of the fixed rings (3) is 3.
3. A detection device for monitoring the direction of water seepage and flow in a groundwater observation well according to claim 1, wherein: and a counterweight is arranged at the bottom of the light path closer (6).
4. A detection device for monitoring the direction of water seepage and flow in a groundwater observation well according to claim 1, wherein: the number of strands of the optical fiber (2) is 28.
5. A detection device for monitoring the direction of water seepage and flow in a groundwater observation well according to claim 1, wherein: the outer ring is provided with a connecting interface (8), and the connecting interface (8) on the fixing ring (3) at the tail end is connected with the light path closer (6).
6. A detection device for monitoring the direction of water seepage and flow in a groundwater observation well according to claim 1, wherein: two adjacent fixing rings (3) are connected together.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010114999.8A CN111307209A (en) | 2020-02-25 | 2020-02-25 | Detection device for monitoring water leakage flow direction in underground water observation well |
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| CN202010114999.8A CN111307209A (en) | 2020-02-25 | 2020-02-25 | Detection device for monitoring water leakage flow direction in underground water observation well |
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2020
- 2020-02-25 CN CN202010114999.8A patent/CN111307209A/en active Pending
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