CN105371907A - Flow field method detection sensor capable of preventing from receiving pseudo-information - Google Patents
Flow field method detection sensor capable of preventing from receiving pseudo-information Download PDFInfo
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- CN105371907A CN105371907A CN201410440113.3A CN201410440113A CN105371907A CN 105371907 A CN105371907 A CN 105371907A CN 201410440113 A CN201410440113 A CN 201410440113A CN 105371907 A CN105371907 A CN 105371907A
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Abstract
The invention discloses a flow field method detection sensor capable of preventing from receiving pseudo-information. The sensor is formed by a high-strength insulating cylindrical housing, two detection electrodes with certain interval, a cable, a filler whose specific gravity is smaller than that of water, and a filler whose specific gravity is greater than that of water. The two detection electrodes are fixed on the outer surface of the cylindrical housing at certain interval. The cable which connects the electrodes enters the housing through a cable waterproof permanent joint on the upper part of the sensor. The upper part in the sensor is the filler which is much lighter than water, and the lower part is the filler which is much heavier than water, so as to ensure the sensor to be in a vertical state in water. Since a distance is between the upper electrode of the sensor and the front end of the sensor, when the front end of the sensor touches water bottom, the detection electrodes would not receive pseudo-information which is from a water bottom layer and prone to cause misjudgement, and the pseudo-information is close to a leakage inlet. The sensor is novel in structure idea and simple in structure, and effectively solves problems of misjudgement of test results of flow field method detection since the sensor touches water bottom.
Description
Technical field
The present invention relates to Geophysical technique field, particularly flow field method detection dam leakage equipment.
Background technology
The latter stage nineties, Central South University is according to flow field law theory, dike piping seepage entrance detection system is developed in innovation, and rapidly in the Changjiang river, the Yellow River, the Zhujiang River, Basin of Huaihe River, Dongting Lake waters, Hanshui Valley and more than ten provinces, city reservoir, apply in the quick detection at more than 20 flood-fighting scene, because accuracy rate is high, can use with flood season at ordinary times, flood season dam leakage hidden danger speedily carry out rescue work, to get rid of and can for determine to provide scientific basis except dangerous scheme in dykes and dams reinforcement.This detection method 2007 year is classified as the advanced practical technique emphasis of water conservancy by Ministry of Water Resources and promotes guidance list, within 2008, be written into People's Republic of China (PRC) water conservancy industry standard SL436-2008 " dyke defect detecting code ", current the method detecting devices forms approved product, obtains generally apply at national water conservancy industry.
Dike piping seepage entrance detection system by information transmitter, receiver and sensor three equipment component form.Before test two electrodes being connected transmitter by electric wire are put into respectively waters, dykes and dams upstream and downstream to leak exit, open transmitter to make the flow field of leak path in waters, dykes and dams upstream and dykes and dams set up electrification to intend flow field, the voltage gradient that this electricity to intend in flow field current density, Electric Field Distribution near leak path under dykes and dams and gateway thereof is worth relatively large.
During test, receiver is placed aboard ship, placed in water by the cable sensor connected on the receiver and go with ship, receiver shows the voltage of electric field gradient data that sensor detects in real time, when sensor is close to seepage entrance, receiver will demonstrate the abnormal data bigger than normal of voltage of electric field gradient, thus finds leak path entrance.
We find approved product sensor existing defects when detecting, and when sensor contacts is to the fake information that receiver can be made to demonstrate during the bottom to be similar to increase close to the voltage of electric field gradient of leak path entrance, cause result of detection to judge by accident.Due to from leak path entrance more close to Zhong electricity Ni flow field, waters voltage gradient true information value bigger than normal larger; namely sensor more closes on leak path entrance; leak path entrance is more easily found; this just requires when detecting leak path entrance; make sensor in water close on the bottom as far as possible, receive close on seepage entrance fake information so sensor often can touch the bottom.In order to not judge result of detection by accident, after detecting exceptional value, first detection personnel on ship is needed to screen the true information of closing on leak path entrance or fake information received, method draws cable to make sensor leave the bottom by a small margin, as abnormal boost value has diminished at once, the abnormal boost value then detected is that sensor touches water-bed generation, and be the fake information irrelevant with closing on leak path entrance, the voltage gradient value detected should not record.After making sensor leave the bottom by a small margin as drawn cable, the abnormal boost value detected obviously does not reduce, then what detect is the true information of closing on leak path entrance, at this moment tackles correlation detection data and carries out record.
This defect of sensor brings following shortcoming: one is to do the true information of closing on leak path entrance or fake information work of screening and receiving.Because sensor detects closing in water-bed waters, sensor touches the situation that the bottom receives fake information and often occurs, and screening what detect is that true information or the workload of fake information are very large.Two is that workload owing to screening true information or fake information is very large, and result of detection erroneous judgement situation easily occurs.Three is be unfavorable for that detection system records automatically to result of detection, seepage entry position identifies to upgrade in direction automatically.Updating apparatus, as direct acquisition and recording result of detection, certainly exists the fake information closing on leak path entrance in a large number in record data, causes result of detection judge by accident or just cannot judge at all.
Summary of the invention
The present invention can provide and a kind ofly can avoid receiving the flow field method acquisition sensor closing on leak path entrance fake information, and this sensor meets " dyke defect detecting code " SL436-2008 requirement.
The technical solution adopted in the present invention is:
Close on leak path entrance fake information region because water-bed layer exists, original sensor is once touch the bottom, and receiver will receive fake information.The technical solution adopted in the present invention core concept changes sensor construction, and the receiving electrode on sensor can not be entered exist the water-bed layer of fake information, sensor does not just receive fake information, and concrete technical scheme is as follows:
1. move equidistant while of two electrodes on sensor after cut cable, namely between sensor front end head and its proximity detection electrode (3), arrange suitable separating distance, this distance length determination principle is as follows: do not receive water-bed intrinsic doubtful in closing on leak path entrance fake information when guaranteeing that sensor front end contact is water-bed between sensor two electrodes.
2. when considering that the sensor that front end lengthens lodges at the bottom, receiving electrode also can enter water-bed region and receive fake information.In order to avoid this phenomenon occurs, the present invention is ingenious utilizes object in water proportion and buoyancy relation, sensor construction entirety is divided into upper and lower two parts, top filled by the filling material (5) little with proportion, and bottom filled by heavy filling material (6).Operationally, whole device is under buoyancy effect, and float in one end that proportion is little, heavy one end sinks for sensor after innovation, and whole sensor is vertical erectility in water.Sensor construction split two segment space sizes up and down and relative scale concerns mandate as follows: one is to ensure that sensor can be sunken to the bottom, the lower space of the great object of packing ratio is enough large, and after filling weight, sensor global specific gravity will much larger than the proportion of water.Two is to ensure that sensor can be erectility under any condition in water, the upper space of filling proportion wisp is enough large, even if sensor is lying in water because of certain reason, for the sensor being axle center with sensor front end portion, the downward torque that the upwards torque that water buoyancy produces produces much larger than self gravitation, water buoyancy can make sensor erect.
The present invention, compared with original sensor, forms novel, structure simple, and has following beneficial effect:
1. sensor of the present invention does not receive and comes from water-bed layer similar in appearance to the fake information closing on leak path entry signal, effectively prevent the possibility producing result of detection erroneous judgement.
2. eliminate the true information of closing on leak path entrance or fake information work of screening and receiving, reduce detection personnel's working strength and difficulty by ship.
3. automatically record to detection process for detection system, seepage entry position identifies that development is laid a good foundation automatically, solve the bottleneck problem of restriction upgrading.
Accompanying drawing explanation
Fig. 1 is a kind of flow field method acquisition sensor structural representation can avoiding receiving fake information, and in figure, sensor left-half is sensor outward appearance, and right half part is sensor internal section of structure.Because sensor entirety is in elongate shape, the upper space of filling proportion wisp is relatively long, and for reducing map sheet, this part employs the line that wrecks.
Embodiment
Can avoid receiving the flow field method acquisition sensor of fake information, sensor is by high-strength insulating cylindrical case (1), two tool exploring electrodes at regular intervals (2) and (3), cable (4), the filling material (5) less than water proportion, form than the heavy filling material (6) of water.
Two exploring electrodes (2) and (3) are fixed on cylindrical case (1) outside surface at a certain distance.
Be shifted a segment distance by equidistant for two electrodes on sensor to cut cable, namely between sensor front end head and its proximity detection electrode (3), be provided with suitable separating distance.
Cable pierces in shell (1), and in cable, two wires are connected with exploring electrode (2) and (3) respectively by bolt.
Sensor construction entirety is divided into upper and lower two parts, top filled by the filling material (5) little with proportion, and bottom filled by heavy filling material (6).When sensor works in water, whole device is under buoyancy, and float in one end that proportion is little, heavy one end sinks, and whole sensor is vertical erectility in water.
Embodiment
Introduce an embodiment of the flow field method acquisition sensor invention can avoiding receiving fake information below.Sensor is by high-strength insulating cylindrical case (1), two tool exploring electrodes at regular intervals (2) and (3), cable (4), the filling material (5) less than water proportion, form than the heavy filling material (6) of water.Its housing (1) is chosen to be nylon material diameter 50mm, wall thickness 5mm hard tube; Cable (4) is chosen to be twin-core tension water-proof cable; The filling material (5) less than water proportion is chosen to be canned polyurethane foams product, and after foaming, obturator proportion is only 0.02kg/cm
3left and right; Lead is chosen to be, the heavy 11.3kg/cm of lead ratio than the heavy filling material (6) of water
3, than water than great 10.3kg/cm
3.
Two exploring electrodes (2) and (3) spacing 60 centimetres are fixed on sensor cylindrical case (1) outside surface.
Compare with original sensor, on shell (1) outside surface, two electrodes are equidistant is shifted 30cm distance to cut cable, namely between sensor front end head and its proximity detection electrode (3), is provided with 30cm separating distance.
Cable pierces in shell (1) by sensor upper cable waterproof fixture splice (7), and in cable, two wires are connected respectively to exploring electrode (2) and (3) of sensor external by bolt.
In order to ensure that sensor can be sunken to the bottom, and can being erectility under any condition in water, by calculating and simulation test, finally determining sensor total length 110cm, fill the upper space length 60cm of proportion wisp, the lower space length 30cm of the great object of packing ratio.The filling material polyurethane foams (5) selecting proportion little fills top, and heavy filling material lead (6) fills bottom.By buoyancy when sensor works in water, float in one end that proportion is little, heavy one end sinks, and whole sensor is vertical erectility in water.
Because embodiment have employed the technology of the present invention, sensor does not receive and comes from water-bed layer similar in appearance to the fake information closing on leak path entrance, effectively prevent the erroneous judgement of result of detection.Eliminate the true information of closing on leak path entrance or fake information work of screening and receiving, reduce detection personnel's work difficulty and intensity by ship.For detection system automatically record to detection data, seepage entry position automatically identify direction upgrading lay a good foundation.
Claims (5)
1. the invention discloses a kind of flow field method acquisition sensor can avoiding receiving fake information, it is characterized in that: sensor is by high-strength insulating cylindrical case (1), two tool exploring electrodes at regular intervals (2) and (3), cable (4), the filling material (5) less than water proportion, filling material (6) composition more heavy than water, two exploring electrodes (2) and (3) are fixed on cylindrical case (1) outside surface at a certain distance, suitable distance is provided with between sensor front end head and its proximity detection electrode (3), cable pierces in shell (1) by sensor upper cable waterproof fixture splice (7), in cable, two wires are connected with exploring electrode (2) and (3) respectively by bolt, entirety is divided into upper and lower two parts by sensor internal structure, top is filled with the little filling material of proportion (5), bottom filled by heavy filling material (6), sensor operationally, whole device is under buoyancy effect, float in one end that proportion is little, heavy one end sinks, whole sensor is vertical erectility in water, because approaching sensor front end exploring electrode is away from the suitable distance of front end, when sensor front end head contacts the bottom, exploring electrode can not receive arrival and easily cause erroneous judgement to close on the fake information of seepage entrance as water-bed layer.
2. the flow field method acquisition sensor can avoiding reception fake information according to claim 1, two exploring electrodes (2) and (3) are fixed on cylindrical case (1) outside surface at a certain distance, are provided with suitable distance between sensor front end head and its proximity detection electrode (3).
3. a kind of flow field method acquisition sensor can avoiding reception fake information according to claim 1, entirety is divided into upper and lower two parts by sensor construction, fill top with the little filling material of proportion (5), bottom filled by heavy filling material (6).
4. a kind of flow field method acquisition sensor can avoiding reception fake information according to claim 1, operationally, whole device is under buoyancy effect, floats in one end that proportion is little for sensor, heavy one end sinks, and whole sensor is vertical erectility in water.
5. a kind of flow field method acquisition sensor can avoiding reception fake information according to claim 1, because approaching sensor front end exploring electrode is away from the suitable distance of front end, when sensor front end head contacts the bottom, exploring electrode can not receive arrival and easily cause erroneous judgement to close on the fake information of seepage entrance as water-bed layer.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20090105969A1 (en) * | 2007-10-23 | 2009-04-23 | Saylor David J | Method and Device for the Assessment of Fluid Collection Networks |
| CN203203909U (en) * | 2013-04-28 | 2013-09-18 | 浙江省水利河口研究院 | Dam body leakage monitoring device |
| CN203441482U (en) * | 2013-07-22 | 2014-02-19 | 上海市岩土工程检测中心 | Single-electrode power supply bottom-installation electrode system |
| CN204214484U (en) * | 2014-09-01 | 2015-03-18 | 黑龙江省水利科学研究院 | A kind of flow field method acquisition sensor can avoiding reception fake information |
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- 2014-09-01 CN CN201410440113.3A patent/CN105371907A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090105969A1 (en) * | 2007-10-23 | 2009-04-23 | Saylor David J | Method and Device for the Assessment of Fluid Collection Networks |
| CN203203909U (en) * | 2013-04-28 | 2013-09-18 | 浙江省水利河口研究院 | Dam body leakage monitoring device |
| CN203441482U (en) * | 2013-07-22 | 2014-02-19 | 上海市岩土工程检测中心 | Single-electrode power supply bottom-installation electrode system |
| CN204214484U (en) * | 2014-09-01 | 2015-03-18 | 黑龙江省水利科学研究院 | A kind of flow field method acquisition sensor can avoiding reception fake information |
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Effective date of abandoning: 20200211 |