CN109975399A - A kind of rail eddy detection system and method - Google Patents
A kind of rail eddy detection system and method Download PDFInfo
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- CN109975399A CN109975399A CN201910340658.XA CN201910340658A CN109975399A CN 109975399 A CN109975399 A CN 109975399A CN 201910340658 A CN201910340658 A CN 201910340658A CN 109975399 A CN109975399 A CN 109975399A
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- 238000001514 detection method Methods 0.000 title claims abstract description 154
- 238000000034 method Methods 0.000 title description 11
- 230000033001 locomotion Effects 0.000 claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 11
- 239000010959 steel Substances 0.000 claims abstract description 11
- 238000007689 inspection Methods 0.000 claims description 18
- 230000002950 deficient Effects 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000005284 excitation Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 230000001012 protector Effects 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 12
- 238000011897 real-time detection Methods 0.000 abstract description 4
- 239000000523 sample Substances 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 11
- 239000004020 conductor Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- NOQGZXFMHARMLW-UHFFFAOYSA-N Daminozide Chemical group CN(C)NC(=O)CCC(O)=O NOQGZXFMHARMLW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9013—Arrangements for scanning
- G01N27/902—Arrangements for scanning by moving the sensors
Abstract
The invention discloses a kind of rail eddy detection systems, including detecting trolley (1), three-dimensional mobile platform (2) and detection device (3), the three-dimensional mobile platform (2) includes driving cabinet (201), screw rod (202), longitudinal movement rail (203) and transverse shifting guide rail (205), the longitudinal movement rail (203) and transverse shifting guide rail (205) are vertical on the detection trolley (1), cabinet (201) are driven to be set at the top of the longitudinal movement rail (203) and transverse shifting guide rail (205), screw rod (202) passes through the driving cabinet (201) and protrudes into track side surfaces.The invention also discloses a kind of rail eddy current detection methods.Detection system of the invention, can all-around mobile eddy current probe rail rail level is detected, flaw indication is collected in real time, signal is handled in real time by vehicle-mounted workbench, it realizes the real-time detection to in-service steel rail defect, solves the problems such as high rail-defect detector car cost of equipment and configuration lazy weight.
Description
Technical field
The invention belongs to high-speed rail Cold Chain Logistics technical fields, more particularly, to a kind of rail eddy detection system and side
Method.
Background technique
With a large amount of construction and operation of China express railway, China railways operation total kilometrage breaks through 130,000 kilometers, railway
Transport production supports route and repairs operation mode and put forward new requirements.It is original to carry out route inspection using the Train Interval time-division
The operation mode looked into, existing skylight operation mode is substituted.And operating speed is only the hand propelled defectoscope of 2km/h in 3-
Detection efficiency is low in 4h Window time, and a large amount of manpower is needed be segmented while detecting.Therefore in recent years from external a large amount of
Large-scale rail-defect detector car has been introduced, has become the master of existing railway rail examination, but high cost of equipment and configuration quantity is not
Foot is the new problem that current work business system faces.
Common lossless detection method includes EDDY CURRENT, Liquid penetrant testing, Magnetic testing, ultrasound examination etc..Vortex inspection
A kind of lossless detection method being built upon on electromagnetic induction principle basis is surveyed, conductive material is suitable for.When conductor is placed in friendship
Among varying magnetic field, there will be induced current generation in conductor, this electric current is known as being vortexed.(such as due to conductor itself various factors
Conductivity, magnetic conductivity, shape, size and defect etc.) variation, will lead to faradic variation, sentenced using this phenomenon
Know conductor nature, state and has flawless detection method.The in-service rail rail bottom narrow space of railway, generally in 50mm or so,
And rail bottom face is generally rough.Due to rail external form, ultrasonic inspection trolley and cart can not detect rail bottom two
Alar part.Down due to rail bottom detection, can not also implement so as to cause Magnetic testing and penetrant detecting method.
Patent document CN109060951A discloses a kind of rail rail bottom dedicated swirl detection device, including control unit,
First coil, the second coil, handle and flexible connector, first coil are connect with control unit, and the second coil and control are single
Member connection, and connect by flexible connector with first coil, handle is connect with flexible connector, is set by handle control detection
Standby movement.The equipment can be adapted for the detection environment that rail rail bottom is narrow, coarse, and with high excellent of detection accuracy
Point.But it is hand propelled defectoscope, and detection efficiency is low, it is difficult to adapt to high-speed railway rail detection demand.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of rail eddy detection system and side
Method is equipped with modularization eddy current testing device in the two sides of mobile detection trolley, can all-around mobile by three-dimensional mobile platform
Eddy current probe detects rail rail level, is capable of real-time acquisition the flaw indication of rail rail level, small by mobile detection
The vehicle-mounted workbench of vehicle is handled in real time signal the real-time detection, it can be achieved that in-service steel rail defect, solves large-scale rail
Inspection car cost of equipment is high and configures the predicament of lazy weight.
To achieve the goals above, according to one aspect of the present invention, a kind of rail eddy detection system, including inspection are provided
Survey trolley, the three-dimensional mobile platform on the detection trolley and the detection device set on the three-dimensional mobile platform two sides；Its
In,
The detection trolley is across on track, and can orbital motion, realize detection to track with motion detection device；
The three-dimensional mobile platform includes driving cabinet, screw rod, longitudinal movement rail and transverse shifting guide rail, the longitudinal direction
Moving guide rail and transverse shifting guide rail are vertical on the detection trolley, and driving cabinet is set to the longitudinal movement rail and transverse direction
At the top of moving guide rail, screw rod passes through the driving cabinet and protrudes into track side surfaces, and drive the detection device direction along ng a path and/or
It is mobile perpendicular to orbital direction, realize that all standing to rail rail level detects.
Further, wherein one end is equipped with longitudinal mobile motor to the longitudinal movement rail, the longitudinal mobile motor
Output shaft is connect by transmission shaft with driving cabinet.
Further, wherein one end is equipped with transverse mobile motor to the transverse shifting guide rail, the transverse mobile motor
Output shaft is connect by transmission shaft with driving cabinet.
Further, the detection trolley includes car body and vehicle-mounted work platform, and the car body is steel frame structure, vehicle
Workbench is carried to be set in the frame structure.
Further, the detection trolley includes idler wheel, which is set to the four corners of the frame structure, and along track
Direction is groove structure, and the groove shapes and size match with the rail level shape and size of track just.
Further, the detection trolley includes vehicle power supply, which is set to the front end of detection trolley, and the vehicle
It carries power supply and sets front end side equipped with headlamp.
Further, the detection trolley includes anticollision corner protector, which is prepared for rubber material, is set respectively
There are the ending both ends of the car body.
Further, the detection device includes shell, the shell be column structure, be successively arranged from inside to outside magnetic core,
Detection coil and excitation coil, wherein the magnetic core is fabricated for MnZn ferrite material.
Other side according to the invention provides a kind of rail eddy current detection method, is vortexed inspection using the rail
Examining system is realized, is included the following steps:
S1: screw rod control detection device moves down, and stops moving down after the rail level that detection device touches rail；
S2: three-dimensional mobile platform control detection device, which slowly moves ahead, to be detected, and is realized to rail longitudinally detection operation, together
When three-dimensional mobile platform control detection device laterally move, realize and all standing of rail level detected, and collect rail in real time
The flaw indication of rail level；
S3: flaw indication is transferred to vehicle-mounted workbench by detection device, is handled in real time signal；
S4: after being disposed, being moved upwards by screw rod, is made detection device far from rail, is stopped detection operation.
Further, a marshalling, previous rail EDDY CURRENT are formed using two rail eddy detection systems
System is used for orbital motion, carries out initial survey to rail, when finding that rail is defective, the latter rail eddy detection system stops
Get off and further essence inspection is carried out to defective locations, determines its specific defective form and parameter, and handled.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
1. detection system of the invention is equipped with modularization eddy current testing device in the two sides of mobile detection trolley, passes through
Three-dimensional mobile platform, can all-around mobile eddy current probe rail rail level is detected, be capable of real-time acquisition rail rail level
Flaw indication, signal is handled in real time by mobile detection trolley vehicle-mounted workbench, it can be achieved that in-service steel rail defect
Real-time detection, solve large-scale rail-defect detector car cost of equipment it is high and configuration lazy weight predicament.
2. detection system of the invention drives rail by staff and detects trolley, control is installed on detection trolley two
The eddy current testing device of side carries out flaw indication acquisition to rail, then carries out online processing to signal by vehicle-mounted workbench, real
The real-time monitoring of existing steel rail defect ensure that the operational safety of high-speed rail to take maintenance measure.
3. detection system of the invention, rail eddy detection system and method are at low cost, easy to operate, can to rail rail level into
Row examining, detection efficiency are high.
4. detection system of the invention, eddy current testing device uses modularized design, and device replacement is simple.
5. detection system of the invention detects the movement of trolley and the movement of eddy current testing device by vehicle-mounted workbench control
System, while the signal of eddy current testing device acquisition is uploaded to vehicle-mounted workbench, is carried out by vehicle-mounted workstation to signal online
Processing can real-time monitor the defect place of rail.
6. detection method of the invention, detection trolley, which slowly moves ahead, to be detected, realize to rail longitudinally detection operation, together
When three-dimensional mobile platform control detection device laterally move, collect the flaw indication of rail rail level in real time, and defect is believed
Number it is transferred to vehicle-mounted workbench, signal is handled in real time, realizes that all standing to rail level detects.
7. detection method of the invention forms a marshalling, previous rail using two rail eddy detection systems
Eddy detection system is used for orbital motion, carries out initial survey to rail, when finding that rail is defective, the vortex inspection of the latter rail
Examining system, which stops, carries out further essence inspection to defective locations, determines its specific defective form and parameter, and handled, greatly
Rail precision and efficiency of detecting is improved greatly.
Detailed description of the invention
Fig. 1 is a kind of rail eddy detection system of the embodiment of the present invention and method structural schematic diagram；
Fig. 2 is a kind of rail eddy detection system of the embodiment of the present invention and method side view
Fig. 3 is the top view of three-dimensional mobile platform of the embodiment of the present invention；
Fig. 4 is the axonometric drawing of three-dimensional mobile platform of the embodiment of the present invention；
Fig. 5 is eddy current probe of embodiment of the present invention structural schematic diagram.
In all the appended drawings, same appended drawing reference indicates identical technical characteristic, specifically: 1- detects trolley；101-
Vehicle-mounted work platform；102- anticollision corner protector；103- vehicle power supply；104- headlamp；2- three-dimensional mobile platform；201- driving machine
Case；202- screw rod；203- longitudinal movement rail；204- longitudinal mobile motor；205- transverse shifting guide rail；206- transverse shifting electricity
Machine；3- detection device；301- magnetic core；302- detection coil；303- excitation coil.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below that
Not constituting conflict between this can be combined with each other.
As shown in Figure 1, the embodiment of the present invention provides a kind of rail eddy detection system, including detects trolley 1, is set to the inspection
Survey the three-dimensional mobile platform 2 on trolley and the detection device 3 set on 2 two sides of three-dimensional mobile platform.Wherein, trolley 1 is detected
Can be across on track, and can orbital motion, to realize detection to track with motion detection device 3, meanwhile, three-dimensional is mobile
Platform 2 can direction along ng a path and/or mobile perpendicular to orbital direction, detection device 3 can be controlled thereon by three-dimensional mobile platform 2
Lower left-right and front-back movement, to realize that detection device 3 detects all standing of rail rail level.Detection system of the invention is being moved
The two sides of dynamic detection trolley are equipped with modularization eddy current testing device, can all-around mobile vortex inspection by three-dimensional mobile platform
Probing head detects rail rail level, is capable of real-time acquisition the flaw indication of rail rail level, vehicle-mounted by mobile detection trolley
Workbench is handled in real time signal the real-time detection, it can be achieved that in-service steel rail defect, solves large-scale rail-defect detector car
Cost of equipment is high and configures the predicament of lazy weight.
As shown in Fig. 2, carrier of the inspection vehicle trolley 1 mainly as detection device and staff, including vehicle-mounted work platform
101, anticollision corner protector 102, vehicle power supply 103, headlamp 104 and car body and idler wheel.Wherein, car body is preferably steel frame knot
Structure, vehicle-mounted work platform 101 are set in the frame structure, for controlling detection trolley mass motion and detection device operation, together
When Real time displaying and processing are carried out to the obtained result of detection.Idler wheel is set to the frame structure quadrangle, it is preferable that the idler wheel is along rail
Road direction is groove structure, and the groove shapes and size match with the rail level shape and size of track just, is convenient for idler wheel card
On track, and can orbital motion.Vehicle power supply 103 is set to the front end of detection trolley 1, moves ahead and sets for detection trolley 1
Received shipment row is powered.Be equipped with headlamp 104 in vehicle power supply front end side, under light poor condition, to track into
Row illumination.In addition, the ending end in car body is additionally provided with anticollision corner protector 102, which is preferably rubber material preparation
It forms, is damaged for protecting entire detection system that it is avoided to collide with other vehicles or object.
As shown in Figure 3 and Figure 4, three-dimensional mobile platform 2 is wrapped for driving detection device 3 to be detected along entire rail level
Include driving cabinet 201, screw rod 202, longitudinal movement rail 203, longitudinal mobile motor 204, transverse shifting guide rail 205 and transverse direction
Mobile motor 206.Wherein, longitudinal movement rail 203 and transverse shifting guide rail 205 are vertical on car body, and driving cabinet 201 is set
Rail side is protruded into after screw rod 202 passes through the driving cabinet 201 in longitudinal movement rail 203 and 205 top of transverse shifting guide rail
Face, driving 201 built-in motor of cabinet and screw rod 202 are sequentially connected, and screw rod 202 can be driven to move up and down, so that detection be driven to fill
Set 3 up and down motions.
In addition, 203 one end of longitudinal movement rail is equipped with longitudinal mobile motor 204, the output of the longitudinal mobile motor 204
Axis is connect by transmission shaft with driving cabinet 201, and vehicle-mounted work platform 101 controls longitudinal mobile motor 204 according to track condition
Movement, to drive driving cabinet 201 to vertically move, to realize to rail longitudinally detection operation；Transverse shifting guide rail 205 its
Middle one end is equipped with transverse mobile motor 206, and the output shaft of the transverse mobile motor 206 passes through transmission shaft and driving cabinet 201
Connection, vehicle-mounted work platform 101 control transverse mobile motor 206 according to track condition and act, to drive driving cabinet 201 vertical
To movement, to realize that all standing to rail level detects.
Steel rail defect is detected as shown in figure 5, detection device 3 is based on EDDY CURRENT principle, including shell, the shell
Preferably column structure is successively arranged magnetic core 301, detection coil 302 and excitation coil 303 from inside to outside.Wherein, magnetic core 301
Preferably MnZn ferrite material is fabricated, and for enhancing magnetic field strength, is detected convenient for detection coil；Detection coil 302 is used
In detection electromagnetic field change information；Excitation coil 303 is used to provide the alternate electrical signal excitation of Pulsed eddy current testing.
The embodiment of the present invention provides a kind of rail eddy current detection method, its working principles are as follows:
The detection operation of the motion work and detection device of rail eddy detection system and method is by vehicle-mounted workbench 101
Carry out control processing.Detection device 3 is installed on the two sides of detection trolley 1, can control it up and down by three-dimensional mobile platform 2
It moves forward and backward.Wherein, specific detection process is as follows:
(1) detection device 3 is controlled by screw rod 202 to move down, stop after the rail level that detection device 3 touches rail
Only move down；
(2) three-dimensional mobile platform 2 controls slow move ahead of detection device 3 and is detected, and realizes to rail longitudinally detection operation,
Three-dimensional mobile platform 2 controls detection device 3 and laterally moves simultaneously, realizes that all standing to rail level detects, collects steel in real time
The flaw indication of rail rail surface；
(3) flaw indication is transferred to vehicle-mounted workbench 101 by detection device, is handled in real time signal；
(4) it after being disposed, is moved upwards by screw rod 202, makes detection device 3 far from rail, made to stop detection
Industry.
Preferably, two rail eddy detection systems can be used and form a marshalling, previous rail EDDY CURRENT system
System is used for orbital motion, carries out initial survey to rail, when finding that rail is defective, the latter rail eddy detection system stops
To carry out defective locations further essence inspection, determines its specific defective form and parameter, and handled.The latter rail whirlpool
After flowing detection system processing essence inspection, continues to next defect point and carry out essence inspection operation.Pass through detection one in front and one in back
System marshalling, one of rail eddy detection system can carry out quick initial survey to rail, determine steel rail defect position, and will letter
It number is transferred to the latter rail eddy detection system, the latter rail eddy detection system directly reaches designated position and carries out essence
Inspection, substantially increases rail precision and efficiency of detecting.
Detection method of the invention, detection trolley, which slowly moves ahead, to be detected, and is realized to rail longitudinally detection operation, simultaneously
Three-dimensional mobile platform control detection device laterally moves, and collects the flaw indication of rail rail level in real time, and by flaw indication
It is transferred to vehicle-mounted workbench, signal is handled in real time, realizes that all standing to rail level detects.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of rail eddy detection system, which is characterized in that including detection trolley (1), three on the detection trolley (1)
The detection device (3) tieed up mobile platform (2) and be set to three-dimensional mobile platform (2) two sides；Wherein,
The detection trolley (1) is across on track, and can orbital motion, realize inspection to track with motion detection device (3)
It surveys；
The three-dimensional mobile platform (2) includes driving cabinet (201), screw rod (202), longitudinal movement rail (203) and laterally moves
Dynamic guide rail (205), the longitudinal movement rail (203) and transverse shifting guide rail (205) are vertical at the detection trolley (1)
On, driving cabinet (201) is set at the top of the longitudinal movement rail (203) and transverse shifting guide rail (205), and screw rod (202) passes through
The driving cabinet (201) protrudes into track side surfaces, and drives the detection device (3) direction along ng a path and/or perpendicular to track side
To movement, realize that all standing to rail rail level detects.
2. a kind of rail eddy detection system according to claim 1, which is characterized in that the longitudinal movement rail
(203) wherein one end is equipped with longitudinal mobile motor (204), the output shaft of the longitudinal mobile motor (204) by transmission shaft with
Drive cabinet (201) connection.
3. a kind of rail eddy detection system according to claim 1 or 2, which is characterized in that the transverse shifting guide rail
(205) wherein one end is equipped with transverse mobile motor (206), the output shaft of the transverse mobile motor (206) by transmission shaft with
Drive cabinet (201) connection.
4. a kind of rail eddy detection system according to any one of claim 1-3, which is characterized in that the detection is small
Vehicle (1) includes car body and vehicle-mounted work platform (101), and the car body is steel frame structure, and vehicle-mounted work platform (101) is set to
In the frame structure.
5. a kind of rail eddy detection system described in any one of -4 according to claim 1, which is characterized in that the detection is small
Vehicle (1) includes idler wheel, which is set to the four corners of the frame structure, and direction along ng a path is groove structure, the groove type
Shape and size match with the rail level shape and size of track just.
6. a kind of rail eddy detection system according to any one of claims 1-5, which is characterized in that the detection is small
Vehicle (1) includes vehicle power supply (103), which is set to the front end of detection trolley (1), and the vehicle power supply (103)
If front end side is equipped with headlamp (104).
7. a kind of rail eddy detection system according to claim 1 to 6, which is characterized in that the detection is small
Vehicle (1) includes anticollision corner protector (102), which is prepared for rubber material, is respectively equipped with the receipts of the car body
Tail both ends.
8. a kind of rail eddy detection system described in any one of -7 according to claim 1, which is characterized in that the detection dress
Setting (3) includes shell, which is column structure, is successively arranged magnetic core (301), detection coil (302) and excitation from inside to outside
Coil (303), wherein the magnetic core (301) is fabricated for MnZn ferrite material.
9. a kind of rail eddy current detection method, which is characterized in that application such as rail of any of claims 1-8 is vortexed
Detection system is realized, is included the following steps:
S1: screw rod (202) control detection device (3) moves down, and stops after the rail level that detection device (3) touches rail
It moves down；
S2: three-dimensional mobile platform (2) control detection device (3) slowly moves ahead and is detected, and realizes to rail longitudinally detection operation,
Three-dimensional mobile platform (2) control detection device (3) laterally moves simultaneously, realizes that all standing to rail level detects, and adopt in real time
Collect the flaw indication of rail rail level；
S3: flaw indication is transferred to vehicle-mounted workbench (101) by detection device, is handled in real time signal；
S4: after being disposed, being moved upwards by screw rod (202), is made detection device (3) far from rail, is stopped detection operation.
10. a kind of rail eddy current detection method according to claim 9, which is characterized in that use two rail whirlpools
It flowing detection system and forms a marshalling, previous rail eddy detection system is used for orbital motion, initial survey is carried out to rail, when
It was found that the latter rail eddy detection system, which stops, carries out further essence inspection to defective locations when rail is defective, it is determined
Specific defective form and parameter, and handled.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910340658.XA CN109975399A (en) | 2019-04-25 | 2019-04-25 | A kind of rail eddy detection system and method |
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| CN201910340658.XA CN109975399A (en) | 2019-04-25 | 2019-04-25 | A kind of rail eddy detection system and method |
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| CN111521671A (en) * | 2020-05-19 | 2020-08-11 | 华中科技大学 | Eddy current flaw detection method and device for surface cracks of steel rail |
| WO2021223423A1 (en) * | 2020-05-07 | 2021-11-11 | 南京航空航天大学 | Parameter design method for high-speed rail defect detection system based on differential eddy current |
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| WO2021223423A1 (en) * | 2020-05-07 | 2021-11-11 | 南京航空航天大学 | Parameter design method for high-speed rail defect detection system based on differential eddy current |
| CN111521671A (en) * | 2020-05-19 | 2020-08-11 | 华中科技大学 | Eddy current flaw detection method and device for surface cracks of steel rail |
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