CN106970143A - A kind of method that contactless double source magnetic field comprehensive detects metallic conduit defect - Google Patents
A kind of method that contactless double source magnetic field comprehensive detects metallic conduit defect Download PDFInfo
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- CN106970143A CN106970143A CN201710291938.7A CN201710291938A CN106970143A CN 106970143 A CN106970143 A CN 106970143A CN 201710291938 A CN201710291938 A CN 201710291938A CN 106970143 A CN106970143 A CN 106970143A
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- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
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- G—PHYSICS
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- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/081—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices the magnetic field is produced by the objects or geological structures
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Abstract
The present invention relates to a kind of method that contactless double source magnetic field comprehensive detects metallic conduit defect, comprise the following steps, S1, determine the detection route of the contactless detection in ground and arrange a series of measuring points；S2, separately detects out the electromagnetic response feature of metallic conduit each measuring point under natural magnetic field and artificial magnetic field；S3, draws electromagnetic response indicatrix of the metallic conduit under natural magnetic field and artificial double magnetic fields respectively；S4, carries out differential amplification processing to the electromagnetic response indicatrix under artificial double magnetic fields and obtains gradient modulus spatial abnormal feature figure；S5, composite index is determined according to the electromagnetic response indicatrix under gradient modulus spatial abnormal feature figure and natural magnetic field；S6, the electromagnetic response indicatrix of the metallic conduit under natural magnetic field and artificial double magnetic fields is analyzed, and determines with reference to the composite index position and the rank of metallic conduit defect.Instant invention overcomes a variety of drawbacks in the method for existing contact detection metallic conduit local defect.
Description
Technical field
The present invention relates to metal pipeline flaw detection field, and in particular to a kind of contactless double source magnetic field comprehensive detection metal tube
The method of road defect.
Background technology
At present, the method for generally detecting metallic conduit local defect using contact to detection metallic conduit local defect,
It mainly uses professional detecting devices (interior inspection defectoscope), come record the metallic conduit being magnetized in advance magnetic field stress lack
Fall into.This method includes cleaning equipment and interior inspection defectoscope, rinses, cleans inside metallic conduit and ensures leading to completely for section
Freely, defectoscope is allowed to pass through while tube wall is magnetized, simultaneously storage tape is abnormal according to the magnetic field of scattered and saturation record, interpretation institute
The information of acquisition determines all local defects of metallic conduit to judge the abnormal position and the feature that are found according to this method
Position and parameter and speculate defect Producing reason.This method uses interior detection device valency mainly by inside detection
Lattice are expensive, and carry out cleaning demagnetization to metallic conduit, also to carry out uniform magnetization to metallic conduit, process is cumbersome, and require
Close to the surface of object to be detected, it may require that and excavate metallic conduit in advance, largely blindly opened because metallic conduit condition does not possess
The possibility of digging thus limits its large-scale popularization.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of contactless double source magnetic field comprehensive detection metallic conduit and lacked
Sunken method, overcomes a variety of drawbacks in the method for existing contact detection metallic conduit local defect.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of contactless double source magnetic field comprehensive detection metal
The method of defect of pipeline, comprises the following steps,
S1, the detection route of the contactless detection in ground is determined according to the trend and orientation of buried metal pipeline, and visiting
Survey on route and arrange a series of measuring points；
S2, carries out Electromagnetic Continuous detection along detection route, separately detects out metallic conduit in natural magnetic field and artificial magnetic field
The electromagnetic response feature of each lower measuring point；
S3, the different measuring points detected on route is drawn as time road, respectively metallic conduit in natural magnetic field and artificial
Electromagnetic response indicatrix under double magnetic fields；
S4, carries out differential amplification processing to electromagnetic response indicatrix of the metallic conduit under artificial double magnetic fields, obtains ladder
Spend modulus spatial abnormal feature figure；
S5, is determined according to the electromagnetic response indicatrix of gradient modulus spatial abnormal feature figure and metallic conduit under natural magnetic field
Composite index of the metallic conduit in each measuring point；
S6, the electromagnetic response indicatrix of the metallic conduit under natural magnetic field and artificial double magnetic fields is analyzed,
And position and the rank of metallic conduit defect are determined with reference to the composite index.
The beneficial effects of the invention are as follows：A kind of contactless double source magnetic field comprehensive of the present invention detects the side of metallic conduit defect
Method is the electromagnetism that detection metallic conduit is combined in the utilization natural magnetic field of metallic conduit outside contactless formula and artificial double magnetic fields
Response characteristic, to the difference processing of two signals in artificial double field sources, so as to reach the abnormal purpose of amplification and then infer scarce
Position and rank are fallen into, a variety of drawbacks in the method for existing contact detection metallic conduit local defect is overcome, such as need to blindly open
Dig, cleaning demagnetization is carried out to metallic conduit, the complicated processes of uniform magnetization are finally also carried out to metallic conduit；Simultaneously for list
The problem of pure natural magnetic field is limited reduction accuracy of detection by scene interference and too weak etc. condition of the buried depth too number of deeply convinceing, can be effective
Improve investigation depth and detection accuracy；In addition, the present invention is using natural magnetic field and artificial double magnetic field comprehensive detection methods, sensitivity
Also greatly improve, loss is substantially reduced, testing cost is substantially reduced, operational risk is low, it is easy to field conduct.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement.
Further, the detection route is the trend of the metallic conduit, and positioned at the surface of the metallic conduit.
Further, ensure that two transmitting coils are arranged in all the time in detection process using live survey line or GPS location
Directly over metallic conduit.
Further, when carrying out natural magnetic field detection in S2, using geomagnetic field as field source, direct measurement metallic conduit is each
The electromagnetic response feature of individual measuring point.
Further, when carrying out artificial double detection of magnetic field in S2, three are respectively provided with default spacing arrangement on detection route
Two transmitting coils of component receiving transducer, and along detection two transmitting coils of route synchronizing moving, utilize two transmitting coils
Excite identical electromagnetic field as field source simultaneously, metallic conduit is measured in two transmitting coils by three-component receiving transducer respectively
The electromagnetic response feature of each lower measuring point.
Further, the specific method of electromagnetic response indicatrix of the drafting metallic conduit under artificial double magnetic fields is in S3,
Extract the electricity of metallic conduit different time of each measuring point under two transmitting coils respectively from two three-component receiving transducers
Magnetic response feature, and the electromagnetic response feature of the different measuring points same time point by metallic conduit respectively under two transmitting coils
Full curve is connected into, electromagnetic response indicatrix of the metallic conduit under artificial double magnetic fields is formed.
Further, it is that difference is carried out to the electromagnetic response indicatrix of metallic conduit respectively under two transmitting coils in S4
Enhanced processing, obtains gradient modulus spatial abnormal feature figure.
Further, S4 by the electromagnetism of Analysis of Data Conversion metallic conduit respectively under two transmitting coils specifically, rung
Answer indicatrix, and according to the result of analysis determine metallic conduit ambient field response characteristic and artificial double magnetic fields under two three
The deviation of component receiving transducer gathered data, judges that metallic conduit is of the presence of an anomaly with and position, and form ladder according to deviation
Spend modulus spatial abnormal feature figure.
Further, in S5, electromagnetic response indicatrix of the metallic conduit under natural magnetic field as metallic conduit background
Field response characteristic.
Brief description of the drawings
Fig. 1 is a kind of flow chart of the method for contactless double source magnetic field comprehensive detection metallic conduit defect of the present invention；
Fig. 2 exists for metallic conduit in a kind of method of contactless double source magnetic field comprehensive detection metallic conduit defect of the present invention
Acquisition mode figure under artificial double magnetic fields；
Fig. 3 exists for metallic conduit in a kind of method of contactless double source magnetic field comprehensive detection metallic conduit defect of the present invention
Electromagnetic response characteristic curve diagram under artificial double magnetic fields；
Fig. 4 exists for metallic conduit in a kind of method of contactless double source magnetic field comprehensive detection metallic conduit defect of the present invention
Gradient modulus spatial abnormal feature figure under artificial double magnetic fields.
In accompanying drawing, the list of parts representated by each label is as follows：
1st, A transmitting coils, 2, B transmitting coils, 3, coil brace, 4, three-component receiving transducer, 5, cable, 6, ground, 7,
Metallic conduit, 8, defect.
Embodiment
The principle and feature of the present invention are described below in conjunction with accompanying drawing, the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in figure 1, a kind of method that contactless double source magnetic field comprehensive detects metallic conduit defect, including following step
Suddenly,
S1, the detection route of the contactless detection in ground is determined according to the trend and orientation of buried metal pipeline, and visiting
Survey on route and arrange a series of measuring points；
S2, carries out Electromagnetic Continuous detection along detection route, separately detects out metallic conduit in natural magnetic field and artificial magnetic field
The electromagnetic response feature of each lower measuring point；
S3, the different measuring points detected on route is drawn as time road, respectively metallic conduit in natural magnetic field and artificial
Electromagnetic response indicatrix under double magnetic fields；
S4, carries out differential amplification processing to electromagnetic response indicatrix of the metallic conduit under artificial double magnetic fields, obtains ladder
Spend modulus spatial abnormal feature figure；
S5, is determined according to the electromagnetic response indicatrix of gradient modulus spatial abnormal feature figure and metallic conduit under natural magnetic field
Composite index of the metallic conduit in each measuring point；
S6, the electromagnetic response indicatrix of the metallic conduit under natural magnetic field and artificial double magnetic fields is analyzed,
And position and the rank of metallic conduit defect are determined with reference to the composite index.
In this specific embodiment：Double source magnetic field refers to natural magnetic field and artificial double magnetic fields, and artificial double magnetic fields refer to utilize
Artificial means excite two identical magnetic fields simultaneously.
The metallic conduit design analyzed in region to be measured, metallic conduit operation and operation file are checked in S1, according to upper
Embedded underground trend and orientation that material determines metallic conduit are stated, the detection route of ground location, and the detection route is determined
For the trend of the metallic conduit, and positioned at the surface of the metallic conduit.
When carrying out natural magnetic field detection in S2, field source, each measuring point of direct measurement metallic conduit are used as using geomagnetic field
Electromagnetic response feature.
When manually double detection of magnetic field are carried out in S2, three-component reception is respectively provided with default spacing arrangement on detection route
Two transmitting coils of probe, and along detection two transmitting coils of route synchronizing moving, excited simultaneously using two transmitting coils
Identical electromagnetic field measures metallic conduit in two transmittings respectively as the field source in artificial double magnetic fields by three-component receiving transducer
The electromagnetic response feature of each measuring point under coil.Specifically, acquisition mode such as Fig. 2 institute of the metallic conduit under artificial double magnetic fields
Show, two transmitting coils are respectively A transmitting coils 1 and B transmitting coils 2, A transmitting coils 1 and B transmitting coils 2 pass through coil branch
Frame 3 is fixed in the same plane, two three-component receiving transducers 4 by cable 5 respectively with A transmitting coils 1 and B transmitting coils 2
It is connected；Just like 2 as can be seen that A transmitting coils 1, B transmitting coils 2, coil brace 3, three-component receiving transducer 4 and cable 5 are constituted
Probe assembly be located at ground 6 top, metallic conduit 7 is embedded under ground 6, defective 8 on metallic conduit 7, wherein detection group
A transmitting coils 1 and B transmitting coils 2 in part is located at the surface of metallic conduit along detection route arrangement, wherein using now
Survey line or GPS location ensure A transmitting coils 1 and B transmitting coils 2 be arranged in all the time in detection process metallic conduit just on
Side.In addition, A transmitting coils 1 are identical with the specification of B transmitting coils 2, the specification of two three-component receiving transducers 4 is also identical, A hairs
Ray circle 1 and B transmitting coils 2 excite identical electromagnetic field as artificial double magnetic fields simultaneously.
The specific method that electromagnetic response indicatrix of the metallic conduit under artificial double magnetic fields is drawn in S3 is, from two three
Extracted respectively in component receiving transducer metallic conduit each measuring point under two transmitting coils different time (t=1000ms,
1500ms, 2000ms, 2500ms, 3000ms, according to the metallic conduit buried depth different choice different time) electromagnetic response it is special
Levy, and the electromagnetic response feature of the different measuring points same time point by metallic conduit respectively under two transmitting coils is connected into
Continuous curve, forms electromagnetic response indicatrix of the metallic conduit under artificial double magnetic fields, metallic conduit is under artificial double magnetic fields
Electromagnetic response indicatrix is as shown in figure 3, wherein, curve A is that electromagnetic response feature of the metallic conduit under A transmitting coils is bent
Line, curve B is electromagnetic response indicatrix of the metallic conduit under B transmitting coils.
In artificial double magnetic fields, due to the difference on the corresponding electromagnetic response indicatrix of two three-component receiving transducers very
It is small, it is necessary to carry out further differential amplification processing to abnormal, it is to metal tube to obtain in abnormal gradient modulus distribution map, S4
The electromagnetic response indicatrix of road respectively under two transmitting coils carries out differential amplification processing, obtains gradient modulus spatial abnormal feature
Figure.
S4 is specifically, bent by the electromagnetic response feature of Analysis of Data Conversion metallic conduit respectively under two transmitting coils
Line, and the ambient field response characteristic of metallic conduit and manually two three-components receptions under double magnetic fields are determined according to the result of analysis
The deviation for gathered data of popping one's head in, judges that metallic conduit is of the presence of an anomaly with and position according to deviation, and it is different to form gradient modulus
Normal distribution map, wherein, gradient modulus spatial abnormal feature of the metallic conduit under artificial double magnetic fields is as shown in Figure 4.
Electromagnetic response indicatrix of the metallic conduit under natural magnetic field responds special as the ambient field of metallic conduit in S5
Levy, explained for data below and reference is provided.
S5 is specifically, according to gradient modulus spatial abnormal feature figure, with reference to electromagnetic response spy of the metallic conduit under natural magnetic field
Curve is levied, it is determined that detecting the composite index of each measuring point on route.
S6 is specifically, to electromagnetic response indicatrix of the metallic conduit under natural magnetic field and artificial double magnetic fields to score
Analysis, determines the abnormal part mileage of metallic conduit, and estimate defect danger of metallic conduit at the mileage etc. with reference to composite index
Level, and the overall electromagnetic response situation of metallic conduit are classified to metallic conduit technical situation；Being marked on metallic conduit path needs
Excavate the position for verifying hole and excavated, use traditional method to carry out additional metal tube contacts formula in verification hole lossless
Detection, according to verification hole actual conditions be compared with composite index and electromagnetic response exception level, to danger classes with examine
Disconnected result makes last modification, then submits final diagnosis testing result.Because the method for the present invention is by recording metallic conduit electricity
The various change of magnetic responsiveness is measured the difference of the electromagnetic field feedback of close two identical artificial excitations with metallic conduit
To disclose the position with metal defect position, the electromagnetic anomaly state that the abnormality of metallic conduit is produced with defect is contacted
Get up.It is next step and the abnormal number of electromagnetic response of complete metal pipeline in the abnormal numerical value of each measuring point record electromagnetic response
Value is contrasted, so as to select the position of metal defect, and is marked on electromagnetic response figure, is easy to excavation to handle.At excavation
In reason, excavate metallic conduit basic data and extract and 5, verification hole, utilize supersonic detector scanner and ultrasonic thickness gauge
Measuring device carries out additional flaw detection test to metallic conduit, to correct exposed abnormal condition degree and calculate the suitable of metallic conduit
The property used.
As a result of the method for the present invention, if detection exposes dangerous corrosion default, (being more than the loss of 30% wall thickness) is special
The missing of different quantization parameter, should selecting to exist other defect types, (laminate patch, crack, bending, metallic conduit dispatches from the factory defect, welding
Joint defect) other points define check results, come the efficiency of the detection technique that determines the present invention, the test of additional flaw detection should
Completed in no less than 3 verification holes, two of which verification hole is in the abnormal region of exposure, and one in (zero defect) area without exception
Domain, confirms the identical property of the detection project, makes the detection method by the present invention more accurate.What is wherein verified in verification hole is different
The definition of normal degree of danger (metallic conduit defect part) " metal loss "：" not allowing " is (experimental-to be more than 50% metal
The metal loss of pipeline wall thickness)；" admissible " (20%-50% metallic conduit wall thickness metal loss)；" insignificant " (is less than
20% metallic conduit wall thickness metal loss).
In summary, by adopting the above-described technical solution, the beneficial effects of the invention are as follows：It is of the invention a kind of contactless
The method of double source magnetic field comprehensive detection metallic conduit defect is utilization natural magnetic field and the people in metallic conduit outside contactless formula
The double magnetic fields of work are combined the electromagnetic response feature of detection metallic conduit, to the difference processing of two signals in artificial double field sources,
So as to reach the abnormal purpose of amplification and then infer defective locations and rank, existing contact detection metallic conduit is overcome local
A variety of drawbacks in the method for defect, such as need blindly to excavate, carry out cleaning demagnetization to metallic conduit, finally also metallic conduit is entered
The complicated processes of row uniform magnetization；Limited simultaneously for simple natural magnetic field by scene interference and too weak etc. condition of the buried depth too number of deeply convinceing
The problem of system reduction accuracy of detection, it can effectively improve investigation depth and detection accuracy；In addition, the present invention uses natural magnetic field
With artificial double magnetic field comprehensive detection methods, sensitivity is also greatly improved, and loss is substantially reduced, and testing cost is substantially reduced, behaviour
Make risk low, it is easy to field conduct.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (9)
1. a kind of method that contactless double source magnetic field comprehensive detects metallic conduit defect, it is characterised in that：Comprise the following steps,
S1, the detection route of the contactless detection in ground is determined according to the trend and orientation of buried metal pipeline, and on detection road
A series of measuring points are arranged on line；
S2, carries out Electromagnetic Continuous detection along detection route, separately detects out metallic conduit each under natural magnetic field and artificial magnetic field
The electromagnetic response feature of individual measuring point；
S3, using the different measuring points detected on route as time road, draws metallic conduit in natural magnetic field and artificial double magnetic respectively
Electromagnetic response indicatrix off field；
S4, carries out differential amplification processing to electromagnetic response indicatrix of the metallic conduit under artificial double magnetic fields, obtains gradient-norm
Measure spatial abnormal feature figure；
S5, metal is determined according to the electromagnetic response indicatrix of gradient modulus spatial abnormal feature figure and metallic conduit under natural magnetic field
Composite index of the pipeline in each measuring point；
S6, the electromagnetic response indicatrix of the metallic conduit under natural magnetic field and artificial double magnetic fields is analyzed, and ties
Close position and rank that the composite index determines metallic conduit defect.
2. the method that a kind of contactless double source magnetic field comprehensive according to claim 1 detects metallic conduit defect, it is special
Levy and be：The detection route is the trend of the metallic conduit, and positioned at the surface of the metallic conduit.
3. the method that a kind of contactless double source magnetic field comprehensive according to claim 2 detects metallic conduit defect, it is special
Levy and be：Ensure that two transmitting coils are arranged in metallic conduit all the time in detection process using live survey line or GPS location
Surface.
4. a kind of contactless double source magnetic field comprehensive according to any one of claims 1 to 3 detects metallic conduit defect
Method, it is characterised in that：When carrying out natural magnetic field detection in S2, field source, direct measurement metallic conduit are used as using geomagnetic field
The electromagnetic response feature of each measuring point.
5. a kind of contactless double source magnetic field comprehensive according to any one of claims 1 to 3 detects metallic conduit defect
Method, it is characterised in that：When carrying out artificial double detection of magnetic field in S2, three are respectively provided with default spacing arrangement on detection route
Two transmitting coils of component receiving transducer, and along detection two transmitting coils of route synchronizing moving, utilize two transmitting coils
Excite identical electromagnetic field as field source simultaneously, metallic conduit is measured in two transmitting coils by three-component receiving transducer respectively
The electromagnetic response feature of each lower measuring point.
6. the method that a kind of contactless double source magnetic field comprehensive according to claim 5 detects metallic conduit defect, it is special
Levy and be：The specific method that electromagnetic response indicatrix of the metallic conduit under artificial double magnetic fields is drawn in S3 is, from two three
The electromagnetic response for extracting metallic conduit different time of each measuring point under two transmitting coils in component receiving transducer respectively is special
Levy, and the electromagnetic response feature of the different measuring points same time point by metallic conduit respectively under two transmitting coils is connected into
Continuous curve, forms electromagnetic response indicatrix of the metallic conduit under artificial double magnetic fields.
7. the method that a kind of contactless double source magnetic field comprehensive according to claim 6 detects metallic conduit defect, it is special
Levy and be：It is that the electromagnetic response indicatrix of metallic conduit respectively under two transmitting coils is carried out at differential amplification in S4
Reason, obtains gradient modulus spatial abnormal feature figure.
8. the method that a kind of contactless double source magnetic field comprehensive according to claim 7 detects metallic conduit defect, it is special
Levy and be：S4 is specifically, bent by the electromagnetic response feature of Analysis of Data Conversion metallic conduit respectively under two transmitting coils
Line, and the ambient field response characteristic of metallic conduit and manually two three-components receptions under double magnetic fields are determined according to the result of analysis
The deviation for gathered data of popping one's head in, judges that metallic conduit is of the presence of an anomaly with and position according to deviation, and it is different to form gradient modulus
Normal distribution map.
9. a kind of contactless double source magnetic field comprehensive according to claims requirement 8 detects the side of metallic conduit defect
Method, it is characterised in that：In S5, electromagnetic response indicatrix of the metallic conduit under natural magnetic field as metallic conduit ambient field
Response characteristic.
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Cited By (6)
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| CN108344795A (en) * | 2018-01-24 | 2018-07-31 | 四川钜莘信合科技有限公司 | Oil-gas pipeline defect identification method, device and electronic equipment |
| CN109613110A (en) * | 2019-02-20 | 2019-04-12 | 武汉地大华睿地学技术有限公司 | A kind of method of contactless three source magnetic field comprehensive detection metallic conduit defect |
| CN109883450A (en) * | 2019-04-11 | 2019-06-14 | 中国石油化工股份有限公司 | Method for positioning magnetic marker of detector in buried steel pipeline |
| CN110231111A (en) * | 2019-06-21 | 2019-09-13 | 西南石油大学 | A kind of contactless stress method of real-time of buried pipeline |
| CN110986745A (en) * | 2019-12-25 | 2020-04-10 | 北京海创高科科技有限公司 | Reinforced concrete detection device based on electromagnetic induction |
| CN114998726A (en) * | 2022-05-23 | 2022-09-02 | 辽宁石油化工大学 | Buried pipeline detection method based on three-component magnetic field curve image recognition |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108344795A (en) * | 2018-01-24 | 2018-07-31 | 四川钜莘信合科技有限公司 | Oil-gas pipeline defect identification method, device and electronic equipment |
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| CN109613110A (en) * | 2019-02-20 | 2019-04-12 | 武汉地大华睿地学技术有限公司 | A kind of method of contactless three source magnetic field comprehensive detection metallic conduit defect |
| CN109883450A (en) * | 2019-04-11 | 2019-06-14 | 中国石油化工股份有限公司 | Method for positioning magnetic marker of detector in buried steel pipeline |
| CN110231111A (en) * | 2019-06-21 | 2019-09-13 | 西南石油大学 | A kind of contactless stress method of real-time of buried pipeline |
| CN110986745A (en) * | 2019-12-25 | 2020-04-10 | 北京海创高科科技有限公司 | Reinforced concrete detection device based on electromagnetic induction |
| CN110986745B (en) * | 2019-12-25 | 2021-02-09 | 北京海创高科科技有限公司 | Reinforced concrete detection device based on electromagnetic induction |
| CN114998726A (en) * | 2022-05-23 | 2022-09-02 | 辽宁石油化工大学 | Buried pipeline detection method based on three-component magnetic field curve image recognition |
| CN114998726B (en) * | 2022-05-23 | 2025-04-08 | 辽宁石油化工大学 | A buried pipeline detection method based on three-component magnetic field curve image recognition |
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