CN105067701A - Pulsed eddy current detection hardware separation method based on rectangular probe - Google Patents
Pulsed eddy current detection hardware separation method based on rectangular probe Download PDFInfo
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- CN105067701A CN105067701A CN201510448415.XA CN201510448415A CN105067701A CN 105067701 A CN105067701 A CN 105067701A CN 201510448415 A CN201510448415 A CN 201510448415A CN 105067701 A CN105067701 A CN 105067701A
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Abstract
The invention provides a rectangular probe-based pulsed eddy current detection hardware separation method capable of effectively separating an eddy current signal and a magnetic leakage signal. The method is superior especially in detection of ferromagnetic materials. According to the method, the structural design of a probe and arrangement of sensors are improved, and eddy current and magnetic leakage signals in a ferromagnetic material are effectively separated mainly through arrangement of different aspect sensors and shielding cases; thus, a detection signal can reflect more defect information, and the advantage of wide frequency spectrum of pulsed eddy current is given to full play. A system used in the method mainly comprises a signal generation module, an exciting coil module, a sensor module, a signal processing module, a signal acquisition module, etc.
Description
Technical field
The present invention mainly through carrying out the research of Signal separator to the improvement of probe and sensor construction, therefore relate to Non-Destructive Testing and technical field of measurement and test.
Background technology
Along with the fast development of world industry, pipeline has a wide range of applications in every field such as petrochemical complex, colliery industry, oceanographic engineerings, has become indispensable part in modern industry.But along with the active time of pipeline is more and more longer, pipeline can have certain potential safety hazard, and the principal element occurred is corrosive pipeline and wearing and tearing.Therefore, the burn into abrasion condition of testing pipes and evaluate reliability and the serviceable life of piping system is one of important means avoiding pipeline accident to occur.The detection method of pipeline is generally being had to ray, ultrasonic, the detection technique such as leakage field and EDDY CURRENT; But ultrasonicly needing couplant, ray needs radioactive source, needs magnetic saturation device during Magnetic Flux Leakage Inspecting, and these all limit the development of detection technique in pipe detection in a way.Impulse eddy current is as a kind of novel detection technique, because it has very wide frequency spectrum, only need single pass just can analyze the defect of test specimen different depth, have penetration depth strong, comprise the features such as abundant information, therefore to the detection of the ferromagnetic components such as pipeline, there is certain advantage.
Summary of the invention
The present invention be directed to the feature that there is eddy current signal and magnetic leakage signal in the Pulsed eddy current testing of ferrimagnet, adopt rectangular probe as detection probe, devise and be equipped with Hall element pcb board, detect zones of different respectively, be provided with magnetic shielding, distinguish eddy current signal and magnetic leakage signal with this, enrich the means of defect quantitative.
Based on a Pulsed eddy current testing hardware separation method for rectangle difference detector, mainly comprise following aspect:
(1) detection system is built:
Build the experiment porch of detection, rectangular probe is lain in a horizontal plane in directly over test specimen, lift-off remains 1mm, the driver unit of detection probe is connected through the pulse signal of amplification, and the Hall element on pcb board .. is connected follow-up signal conditioning circuit;
(2) devise rectangle differential type and absolute type probe detect
(3) PCB of Hall element has been made;
(4) design corresponding signal to occur and modulate circuit;
(5) angle detected between defect and probe axis is optimized.
Described rectangle difference detector modes of emplacement is as follows: probe lies in a horizontal plane in directly over test specimen, and the central axis of probe and test specimen axis keeping parallelism, lift-off value is 1mm.
The step that described detection system detects defect is as follows: when being detected as Pulsed eddy current testing pattern, when rectangle difference detector is placed on fault location, fault location current vortex generation disturbance, and then cause the change of the secondary magnetic field of inducting, and sensor measured signal is Primary field and the secondary magnetic field superposition of exciting field; When detecting my pulse leakage detecting pattern, rectangular probe is owing to can produce the magnetic-field component perpendicular to defect in center, at this moment the leakage in magnetic field is just had, Hall element can capture the change of eddy current magnetism and stray field, and magnetic field value is converted into the form of magnitude of voltage, through process such as follow-up amplification, filtering, denoisings, be input to computing machine by data collecting card carried out follow-up process by oscilloscope display signal.
Technical characteristics of the present invention has:
(1) design of the present invention is hough transform probe, and be different from conventional cylindrical probe, this probe can produce the good eddy current of directivity and magnetic field intensity, is conducive to the detection of defect.
(2) to be employing three Hall elements to signal differential detect and the technology of direct-detection in the present invention, two Hall elements are symmetrically distributed in detection probe two ends, detect respectively have, zero defect signal, corresponding is eddy current signal, and what middle sensor detected is magnetic leakage signal.
(3) the 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 defect and rectangular probe axis to be 45 ° and to detect, Detection results is best in the case.
(5) the present invention chooses the characteristic quantity of Y-component as detection signal in magnetic field, and compare routine and choose magnetic field Z component, the intensity level of magnetic field Y-component is larger.
Accompanying drawing explanation
Fig. 1 is rectangular probe Pulsed eddy current testing schematic diagram.
Fig. 2 is the PCB figure of Hall element.
Fig. 3 is the sectional view of the Hall element PCB of band radome.
Fig. 4 is rectangular probe impulse eddy current Signal separator working mode figure.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
First, experiment porch is as shown in Figure 1 built.The suitable voltage of direct supply is regulated to be input to square wave circuit for generating, produce the square wave of frequency-adjustable, by power amplifier, faint signal is amplified, the signal after amplification enters the drive coil of institute's coiling on rectangle difference detector, and drive coil itself can produce Primary field; When rectangle difference detector (2) lies in a horizontal plane on test specimen (1), the secondary magnetic field that test specimen internal vortex produces and Primary field are coupled, when running into defect (3), vortex density and distribution change, and then there is disturbance in the magnetic field of coupling, this variable quantity detected by Hall element; Test specimen internal vortex can cause the change of magnetic induction density value due to defect (3), by be placed in pcb board (4) both sides Hall element (5), (7) detect zero defect place and defect (3) respectively time magnetic field, Hall element (6) detects the magnetic field of defect middle.In order to eliminate the interference of eddy current magnetism to leakage field, the magnetic shielding cover (8) of aluminum being set at Hall element (6) place, shielding the eddy current magnetism of high frequency.When defect (3) and rectangular probe (4) axis are 45 °, there is best Detection results, by the symmetry of rectangular probe, defect (10), (14) can detect in when 90 °, Hall element (5), (7) may correspond in the upper check point (9) of defect (10), (13) place, also the upper check point (11) of defect (14), (15) place can be corresponded to, the signal now detected forms difference, corresponding eddy current signal; Hall element (6) is corresponding to check point (12) place on defect (10), (14), what detected is magnetic leakage signal, thus can successfully isolate eddy current and magnetic leakage signal by the signal that different sensors exports.Follow-up circuit is accessed in Hall element (5), (6), (7), in order to eliminate HF noise signal, be necessary to carry out low-pass filtering treatment to it, to be eddy current medium and low frequency composition play a major role and filter away high frequency noise for the detection of defect its reason, follow-up signal entering signal modulate circuit is nursed one's health, and the signal waveform after conditioning is presented on oscillograph.Data collecting card one end is responsible for gathering the rectangular pulse signal produced, the other end is responsible for the signal after to conditioning and is gathered and input computer, data are introduced MATLAB and carries out treatment and analysis, carry out identification and the quantitative test of defect, by the operation of above two kinds of different detecting patterns, the eddy current in detection and magnetic leakage signal successfully can be isolated.
Above-described is only the preferred embodiment of the present invention, the invention is not restricted to above embodiment.Be appreciated that the oher improvements and changes that those skilled in the art directly derive without departing from the basic idea of the present invention or associate, all should think and be included within protection scope of the present invention.
Claims (6)
1. based on a Pulsed eddy current testing hardware separation method for rectangular probe, comprise following feature: signal generating module, drive coil module, sensor assembly, signal processing module, signal acquisition module etc.System carrying out practically flow process is that rectangular probe (2) lies in a horizontal plane on test specimen (1), and make the drive coil of rectangular probe (2) connect amplifier, pcb board (4) level embeds in the groove at rectangular probe (2) two ends, makes the Hall element of pcb board (4) face defect (3) during detection.
2. according to the Pulsed eddy current testing hardware separation method based on rectangular probe described in claim 1, it is characterized in that: the length of PCB (4) and width and rectangular probe (2) consistent, its horizontal nest enters in rectangular probe, keeps the precision between PCB (4) and rectangular probe (2).
3. according to the Pulsed eddy current testing hardware separation method based on rectangular probe described in claim 1, it is characterized in that: rectangular probe (2) lies in a horizontal plane on test specimen (1), gap between them is no more than 1mm, makes the Hall element on PCB (4) face defect (3) during detection.
4. according to the Pulsed eddy current testing hardware separation method based on rectangular probe described in claim 1, it is characterized in that: pcb board (4) arranges three Hall elements (5), (6), (7) from left to right successively, interval between three Hall elements is consistent, Hall element (5) and (7) are at PCB (4) plate two ends, Hall element (6), in the centre position of plate, devises magnetic shielding cover (8).
5. according to the Pulsed eddy current testing hardware separation method based on rectangular probe described in claim 1, it is characterized in that: when detection system is in mode of operation, defect (3) should be 45 ° with rectangular probe (2) axis best Detection results, can meet testing requirement between defect (10), (14) in 90 °.
6. according to the Pulsed eddy current testing hardware separation method based on rectangular probe described in claim 1, it is characterized in that: the upper check point (9) of Hall element (5), (7) corresponding defect (10), (13) or the upper check point (11) of corresponding defect (14), (15), Hall element (6) corresponding check point (12).
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Cited By (6)
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| CN105527339A (en) * | 2016-03-01 | 2016-04-27 | 江南大学 | Nondestructive detection method based on combined U-shaped pulse electromagnetic sensor |
| CN105548349A (en) * | 2016-01-18 | 2016-05-04 | 江南大学 | Rectangular probe pulsed eddy current detecting method for realizing defect reconstruction technology |
| 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 |
| CN108088900A (en) * | 2018-01-19 | 2018-05-29 | 沈阳仪表科学研究院有限公司 | A kind of multifunctional combination probe for pipeline detection |
| CN112505139A (en) * | 2020-12-15 | 2021-03-16 | 爱德森（厦门）电子有限公司 | Method and device for removing interference signals in composite material detection |
| CN115047060A (en) * | 2022-05-23 | 2022-09-13 | 中国矿业大学 | Stripping method for pipeline weld defect magnetic leakage signal |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105548349A (en) * | 2016-01-18 | 2016-05-04 | 江南大学 | Rectangular probe pulsed eddy current detecting method for realizing defect reconstruction technology |
| 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 |
| CN105527339A (en) * | 2016-03-01 | 2016-04-27 | 江南大学 | Nondestructive detection method based on combined U-shaped pulse electromagnetic sensor |
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| 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 |
| CN108088900A (en) * | 2018-01-19 | 2018-05-29 | 沈阳仪表科学研究院有限公司 | A kind of multifunctional combination probe for pipeline detection |
| 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 |
| CN112505139A (en) * | 2020-12-15 | 2021-03-16 | 爱德森（厦门）电子有限公司 | Method and device for removing interference signals in composite material 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 |
| CN115047060A (en) * | 2022-05-23 | 2022-09-13 | 中国矿业大学 | Stripping method for pipeline weld defect magnetic leakage signal |
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