CN105067701B - Pulsed eddy current testing hardware separation method based on rectangular probe - Google Patents
Pulsed eddy current testing hardware separation method based on rectangular probe Download PDFInfo
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- CN105067701B CN105067701B CN201510448415.XA CN201510448415A CN105067701B CN 105067701 B CN105067701 B CN 105067701B CN 201510448415 A CN201510448415 A CN 201510448415A CN 105067701 B CN105067701 B CN 105067701B
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- eddy current
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Abstract
The present invention provides a kind of hardware approach for the rectangular probe Pulsed eddy current testing that can efficiently separate eddy current signal and magnetic leakage signal, the detection especially for ferrimagnet shows its superiority.This method is mainly made that some improvement to the structure design of probe and the arrangement of sensor, mainly vortex in ferrimagnet and magnetic leakage signal is set to efficiently separate by the setting of different direction sensor and shielding case, enable detection signal to reflect the information of more defects, the wide advantage of impulse eddy current frequency spectrum is greatly utilized.This system includes mainly signal generating module, excitation coil module, sensor assembly, signal processing module, signal acquisition module etc..
Description
Technical field
The present invention mainly carries out the research of Signal separator by the improvement to probe and sensor structure, therefore relates to nothing
Damage detection and technical field of measurement and test.
Background technology
With the fast development of world industry, pipeline has in every field such as petrochemical industry, colliery industry, ocean engineerings
It is widely applied, has become indispensable part in modern industry.But as the active time of pipeline is increasingly longer, pipeline
There can be some potential safety problems, and the principal element occurred is corrosive pipeline and abrasion.Therefore, the burn into mill of pipeline is detected
It damages situation and evaluates the reliability and service life of pipe-line system, be one of the important means for avoiding pipeline accident from occurring.
Generally there are the detection techniques such as ray, ultrasound, leakage field and EDDY CURRENT to the detection method of pipeline；However ultrasound needs couplant,
Ray needs radioactive source, and when Magnetic Flux Leakage Inspecting needs magnetic saturation device, these all limit detection technique in pipeline in a way
The development of detection.Impulse eddy current only needs single pass energy as a kind of novel detection technique because it has very wide frequency spectrum
The defect for analyzing test specimen different depth has the characteristics that penetration depth is strong, includes abundant information, therefore ferromagnetic to pipeline etc.
Property component detection have certain advantage.
Invention content
The characteristics of the present invention be directed to there are eddy current signal and magnetic leakage signals in the Pulsed eddy current testing of ferrimagnet, adopts
It uses rectangular probe as detection probe, devises and be equipped with Hall sensor pcb board, detect different zones respectively, be provided with magnetic cup
It covers, eddy current signal and magnetic leakage signal is distinguished with this, enrich the means of defect quantitative.
A kind of Pulsed eddy current testing hardware separation method based on rectangular differential probe includes mainly following aspect：
(1) detecting system is built：
Rectangular probe, is lain in a horizontal plane in the surface of test specimen by the experiment porch for building detection, and lift-off remains
The driver unit of detection probe is connected through the pulse signal of amplification by 1mm, after the Hall sensor connection on pcb board ..
Continuous signal conditioning circuit；
(2) it devises rectangle differential type and absolute type probe is detected；
(3) PCB circuit board of Hall sensor has been made；
(4) corresponding signal generation and modulate circuit are designed；
(5) angle between detection defect and probe axis is optimized.
The rectangular differential probe modes of emplacement is as follows：Probe is lain in a horizontal plane in right over test specimen, the center of probe
Axis and test specimen axis keeping parallelism, lift-off value 1mm.
It is as follows that the detecting system detects the step of defect：When being detected as Pulsed eddy current testing pattern, rectangle difference
In fault location, fault location current vortex disturbs probe placement, and then causes the variation of secondary magnetic field inducted, and sensor
Measured signal is Primary field and the secondary magnetic field superposition of exciting field；When detecting my pulse leakage detection pattern, rectangular probe
Since the magnetic-field component perpendicular to defect can be generated at center, the leakage in magnetic field is at this moment just had, Hall sensor can capture
It to the variation of eddy current magnetism and stray field, and converts magnetic field value to the form of voltage value, amplifies, filters, goes by subsequent
It the processing such as makes an uproar, computer is input to by oscilloscope display signal and by data collecting card and carries out subsequent processing.
A kind of Pulsed eddy current testing hardware separation method based on rectangular probe, including following feature：Signal generating module,
Excitation coil module, sensor assembly, signal processing module, signal acquisition module, carrying out practically flow are rectangular probe (2) water
Placing flat makes the excitation coil of rectangular probe (2) connect amplifier, the horizontal embedded square of pcb board (4) on test specimen (1)
Shape pop one's head in (2) both ends slot in, when detection, so that the Hall sensor of pcb board (4) faces defect (3), and pcb board (4) is from a left side
Side is sequentially arranged three Hall sensors (5,6,7) to the right, and the interval between three Hall sensors is consistent, wherein in PCB
Plate (4) both ends are respectively arranged a Hall sensor (5,7), and a Hall sensor (6) is arranged in pcb board (4) centre position
And devise magnetic shielding cover (8).
In one embodiment of the invention, the length and width of pcb board (4) and rectangular probe (2) are consistent, water
It is flat to be nested into rectangular probe, keep the precision between pcb board (4) and rectangular probe (2).
In one embodiment of the invention, rectangular probe (2) is lain in a horizontal plane on test specimen (1), between them
Gap be no more than 1mm, when detection, makes the Hall sensor on pcb board (4) face defect (3).
In one embodiment of the invention, when detecting system is in operating mode, defect (3) should be visited with rectangle
Head (2) axis has best detection result in 45 °, and testing requirements can be met by being in 90 ° between two defects (10,14).
In one embodiment of the invention, the Hall sensor (5,7) at pcb board (4) both ends corresponds to defect respectively
(10) two test points (9,13) on correspond to two test points (11,15) in defect (14) respectively, and pcb board (4) is intermediate
The test point (12) in the Hall sensor (6) of position corresponding defect centre position.
The technical characteristics of the present invention have：
(1) design of the invention is hough transform probe, is different from conventional cylindrical probe, which can the side of generation
Tropism preferably vortex and magnetic field intensity, are conducive to the detection of defect.
(2) present invention is the technology for being detected to signal differential using three Hall sensors and directly being detected, two Halls
Sensor is symmetrically distributed in detection probe both ends, is detected respectively with and without flaw indication, and corresponding is eddy current signal, intermediate biography
Sensor detection is magnetic leakage signal.
(3) present invention devises the magnetic shielding cover of aluminum to shield high-frequency vortex signal, carries out the protection to magnetic leakage signal.
(4) this invention takes defects and rectangular probe axis to be detected in 45 °, and detection result is most in the case
It is good.
(5) present invention chooses characteristic quantity of the Y-component in magnetic field as detection signal, and magnetic field Z component, magnetic are chosen compared to conventional
The intensity value bigger of field Y-component.
Description of the drawings
Fig. 1 is rectangular probe Pulsed eddy current testing schematic diagram.
Fig. 2 is the PCB figures of Hall sensor.
Fig. 3 is the sectional view of the Hall sensor PCB with shielding case.
Fig. 4 is rectangular probe impulse eddy current Signal separator working mode figure.
Specific implementation mode
The following further describes the specific embodiments of the present invention with reference to the drawings.
First, experiment porch as shown in Figure 1 is built.It adjusts the suitable control source of DC power supply and electricity occurs to square wave
Road generates the adjustable square wave of frequency, faint signal is amplified by power amplifier, amplified signal enters rectangle
The excitation coil of institute's coiling, excitation coil itself will produce Primary field on differential probe；When rectangular differential probe (2), level is put
It sets when on test specimen (1), the secondary magnetic field and Primary field that test specimen internal vortex generates couple, when encountering defect (3),
Vortex density and distribution change, and then the magnetic field coupled disturbs, and this variation is detected by Hall sensor
Amount；Test specimen internal vortex can cause the variation of magnetic induction intensity value due to defect (3), by the Hall for being placed in pcb board (4) both sides
Magnetic field when at zero defect and defect (3) is detected in sensor (5), (7) respectively, and Hall sensor (6) detects defect middle
Magnetic field.In order to eliminate interference of the eddy current magnetism to leakage field, the magnetic shielding cover (8) of aluminum is set at Hall sensor (6), is come
Shield the eddy current magnetism of high frequency.When defect (3) and rectangular probe (4) axis are in 45 °, there is best detection result, by square
The symmetry of shape probe, defect (10), (14) can be detected when being in 90 °, and Hall sensor (5), (7) can correspond to defect
(10) test point (9) at (13), may correspond to test point (11) in defect (14), at (15), the signal detected at this time
Form difference, corresponding eddy current signal；Hall sensor (6) corresponds to defect (10), at the test point (12) on (14), is detected
It is magnetic leakage signal, to which the signal exported by different sensors can be successfully separated out vortex and magnetic leakage signal.Hall
Subsequent circuit is accessed in sensor (5), (6), (7), in order to eliminate HF noise signal, it is necessary to be carried out at low-pass filtering to it
Reason, the reason is that low-frequency component plays a major role and filters out high-frequency noise for the detection of defect in vortex, subsequent signal into
Enter signal conditioning circuit to be improved, the signal waveform after conditioning is shown on oscillograph.It is responsible for acquisition in data collecting card one end
The rectangular pulse signal of generation, the other end are responsible for being acquired the signal after conditioning and inputting computer, data are introduced
MATLAB is analyzed and is handled, and the identification and quantitative analysis of defect are carried out, by the operation of both the above difference detection pattern,
The vortex and magnetic leakage signal that can be successfully separated out in detection.
What has been described above is only a preferred embodiment of the present invention, and present invention is not limited to the above embodiments.It is appreciated that this
The oher improvements and changes that field technology personnel directly export or associate without departing from the basic idea of the present invention,
It is considered as being included within protection scope of the present invention.
Claims (5)
1. a kind of Pulsed eddy current testing hardware separation method based on rectangular probe, including following feature：Signal generating module swashs
Coil module, sensor assembly, signal processing module, signal acquisition module are encouraged, carrying out practically flow is that rectangular probe (2) is horizontal
It is placed on test specimen (1), and the excitation coil of rectangular probe (2) is made to connect amplifier, the horizontal embedded rectangle of pcb board (4)
It pops one's head in the slot at (2) both ends, when detection so that the Hall sensor of pcb board (4) faces defect (3), and pcb board (4) is from the left side
Three Hall sensors (5,6,7) are sequentially arranged to the right, the interval between three Hall sensors is consistent, wherein in pcb board
(4) both ends are respectively arranged a Hall sensor (5,7), and a Hall sensor (6) is arranged simultaneously in pcb board (4) centre position
Devise magnetic shielding cover (8).
2. according to the Pulsed eddy current testing hardware separation method based on rectangular probe described in claim 1, it is characterised in that：PCB
The length and width and rectangular probe (2) of plate (4) are consistent, and horizontal nest enters in rectangular probe, keep pcb board (4) and square
Precision between shape probe (2).
3. according to the Pulsed eddy current testing hardware separation method based on rectangular probe described in claim 1, it is characterised in that：Rectangle
Probe (2) is lain in a horizontal plane on test specimen (1), and the gap between them is no more than 1mm, and when detection makes on pcb board (4) suddenly
You face defect (3) by sensor.
4. according to the Pulsed eddy current testing hardware separation method based on rectangular probe described in claim 1, it is characterised in that：Work as inspection
Examining system is in operating mode, and defect (3) should have best detection result with rectangular probe (2) axis in 45 °, and two lack
Testing requirements can be met in 90 ° by falling between (10,14).
5. according to the Pulsed eddy current testing hardware separation method based on rectangular probe described in claim 1, it is characterised in that：PCB
The Hall sensor (5,7) at plate (4) both ends corresponds to two test points (9,13) in defect (10) or corresponds to defect respectively respectively
(14) two test points (11,15) on, the inspection in Hall sensor (6) the corresponding defect centre position in pcb board (4) centre position
Measuring point (12).
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548349B (en) * | 2016-01-18 | 2019-02-22 | 江南大学 | Realize the rectangular probe pulse eddy current detection method of Root cause analysis technology |
| CN105527339B (en) * | 2016-03-01 | 2019-01-25 | 江南大学 | Lossless detection method based on the U-shaped pulse electromagnetic sensor of combined type |
| CN105866239A (en) * | 2016-04-25 | 2016-08-17 | 江南大学 | Detection method for U-shaped pulse fusing sensor based on ferromagnetic test piece |
| CN108088900B (en) * | 2018-01-19 | 2023-09-22 | 沈阳仪表科学研究院有限公司 | Multifunctional composite probe for pipeline internal detection |
| CN112505139B (en) * | 2020-12-15 | 2022-11-25 | 爱德森（厦门）电子有限公司 | Method and device for removing interference signals in composite material detection |
| CN115047060B (en) * | 2022-05-23 | 2023-06-20 | 中国矿业大学 | Stripping method for pipeline weld defect magnetic flux leakage signal |
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| CN102182933A (en) * | 2011-03-22 | 2011-09-14 | 江南大学 | Nondestructive detection system and method for pulsed magnetic flux leakage defects and stresses |
| CN104267094A (en) * | 2014-09-23 | 2015-01-07 | 江南大学 | Pulsed magnetic flux leakage response signal separation method of ferromagnetic component |
| CN104297338A (en) * | 2014-10-31 | 2015-01-21 | 江南大学 | Pulse eddy current detecting system based on rectangular difference probe |
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| JP5188466B2 (en) * | 2009-06-30 | 2013-04-24 | 株式会社日立製作所 | Pulse excitation type eddy current flaw detection method and pulse excitation type eddy current flaw detection apparatus using the same |
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| CN102182933A (en) * | 2011-03-22 | 2011-09-14 | 江南大学 | Nondestructive detection system and method for pulsed magnetic flux leakage defects and stresses |
| CN104267094A (en) * | 2014-09-23 | 2015-01-07 | 江南大学 | Pulsed magnetic flux leakage response signal separation method of ferromagnetic component |
| CN104297338A (en) * | 2014-10-31 | 2015-01-21 | 江南大学 | Pulse eddy current detecting system based on rectangular difference probe |
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| 钢板脉冲涡流检测方法;杨理践 等;《仪表技术与传感器》;20110731(第7期);第87-90页 * |
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