CN101231268A - Polyphase eddy detecting device and method - Google Patents
Polyphase eddy detecting device and method Download PDFInfo
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- CN101231268A CN101231268A CNA2008100572772A CN200810057277A CN101231268A CN 101231268 A CN101231268 A CN 101231268A CN A2008100572772 A CNA2008100572772 A CN A2008100572772A CN 200810057277 A CN200810057277 A CN 200810057277A CN 101231268 A CN101231268 A CN 101231268A
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Abstract
The invention discloses a multiphase eddy current detecting device and a detecting method. The device comprises an input unit, an excitation and receiving unit and a signal processing unit. The method comprises that energizing currents with different phases are input into different drive wires; a rotary scanning magnetic field is generated; a detecting signal is received and output; and the quality of an object to be detected is evaluated according to the detecting signal. The detection for the surface defect of the object to be detected is realized through the rotary magnetic field scanning the object to be detected. The invention has the advantages of simpleness, reliability and flexible and convenient use, and is suitable for detection for metal tubular product and wire stock.
Description
Technical field
The present invention relates to a kind of electromagnetic nondestructive field, relate in particular to a kind of multiphase eddy flow pick-up unit and detection method.
Background technology
Along with the requirement of quality monitoring is more and more stricter, Dynamic Non-Destruction Measurement is also had higher requirement.In industrially developed country, Non-Destructive Testing is arranged side by side with design, material, manufacturing (technology), become four big gordian techniquies of industrial circle, many relevant industries such as machinery, petrochemical industry, Aeronautics and Astronautics, automobile, pressure vessel, railway, road, nuclear industry and technical field are played an important role.
When existing eddy detection technology detects many materials such as tubing, wire rods, material require passes drive coil and receiving coil, the vortex flow that drive coil induces is axial perpendicular to material surface, therefore the axial defective of material surface is bigger to the influence of excitation electromagnetic field, is easy to detect; And the circumferential defective of material surface is owing to be parallel to the vortex flow of drive coil induction, and the circumferential defective of material surface is smaller for the influence that detects magnetic field like this, very difficultly discerned by receiving coil.Because eddy current probe is insensitive to the circumferential defective of material, is easy to cause omission, influences the quality of material and Related product, therefore, eddy current probe is badly in need of being improved.
Summary of the invention
For solving above-mentioned middle problem and the defective that exists, the invention provides a kind of multiphase eddy flow pick-up unit and detection method.
The present invention is achieved by the following technical solutions:
A kind of multiphase eddy flow pick-up unit involved in the present invention comprises:
Input block is used to transmit the exciting current of out of phase, and with the exciting current output of described out of phase;
Encourage and receiving element, be used to receive the exciting current of described out of phase, produce rotating magnetic field, receive and export described detection signal; Described excitation is corresponding one by one with receiving coil with the drive coil of receiving element, and its quantity is at least three groups;
Signal processing unit is used to receive described detection signal, and according to described detection signal, the quality of assessment object under test.
A kind of eddy current detection method, this method comprises:
The exciting current of out of phase is inputed in the different drive coils, and the quantity of described drive coil is at least three;
Produce the excitation rotating magnetic field;
Receive and output detection signal, and according to described detection signal, the quality of assessment object under test.
Described exciting current is a sine-wave current.
The beneficial effect of technical scheme provided by the invention is:
The rotating magnetic field that drive coil provided by the invention produces, the scanning object under test, it is insensitive to the circumferential defective of material and the omission phenomenon that causes has improved the detection quality to have reduced conventional eddy current probe.
Description of drawings
Fig. 1 is multiphase eddy flow pick-up unit figure;
The multiphase eddy flow testing mode synoptic diagram of the probe that Fig. 2 provides for the embodiment of the invention;
The position view of Fig. 3 rotating magnetic field that to be the probe that provides of the embodiment of the invention produce constantly in difference.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing:
Present embodiment provides a kind of multiphase eddy flow pick-up unit.
Eddy current testing device comprises input block, excitation and receiving element and signal processing unit, the eddy current testing device synoptic diagram that the embodiment of the invention provides as shown in Figure 1:
Input block is used to transmit the exciting current of out of phase, and the exciting current of described out of phase is exported;
Excitation and receiving element are used to receive the exciting current of out of phase, produce rotating magnetic field, receive and export described detection signal; The quantity of described exciting unit is at least three;
Excitation may further include exciting current receiving element and detection signal receiving element with receiving element,
Wherein, the exciting current receiving element is used to receive the exciting current of out of phase, produces rotation sweep magnetic field, the scanning object under test; The exciting current receiving element adopts drive coil to realize;
The detection signal receiving element is used to receive detection signal, and with described detection signal output; The detection signal receiving element adopts receiving coil to realize usually, also can realize by other modes;
Exciting current receiving element and detection signal receiving element are corresponding one by one, and its quantity is at least three groups; Signal processing unit is used to receive described detection signal, and according to described detection signal, the quality of assessment object under test.
The eddy current detection method that embodiment of the present invention is provided describes below:
Before implementing Non-Destructive Testing, at first need the exciting current of out of phase is inputed in the different drive coils, the quantity of described drive coil is at least three; Adopt in an embodiment of the present invention sinusoidal wave as exciting current, also can adopt other the alternation square wave or sawtooth wave as exciting current, as long as can make drive coil produce rotating magnetic field, adopt which kind of exciting current to decide according to actual conditions;
Produce rotating magnetic field by excitation;
Object under test is placed rotating magnetic field, and rotating magnetic field scans object under test, goes out the vortex flow of rotation at the object under test surface induction; Therefore, if there is defective in the object under test surface, then can influence the intensity and the phase place of the vortex flow of being responded to;
Receiving element receives detection signal, can obtain object under test and whether have defective according to described detection signal, and the quality of assessment object under test judges further whether object under test meets the reservation requirement.
In the embodiment of the invention, the working method synoptic diagram that the multiphase eddy flow of probe detects as shown in Figure 2, for the probe of n phase, probe comprises n group drive coil and receiving coil, give logical sinusoidal current in n the drive coil respectively, described sinusoidal current can be expressed as respectively:
i
1＝I×sin(wt)
i
2＝I×sin(wt-2π/n)
......
i
n＝I×sin(wt-2(n-1)π/n)
The position view of the rotating magnetic field that produces constantly in difference of then popping one's head in as shown in Figure 3.
The present invention detects material by rotation sweep magnetic field, and this system has advantage simple and reliable and flexible and convenient to use, is suitable for metal pipe material, wire rod are detected.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (4)
1. an eddy current testing device is characterized in that, described device comprises:
Input block is used to transmit the exciting current of out of phase, and with the exciting current output of described out of phase;
Encourage and receiving element, be used to receive the exciting current of described out of phase, produce rotating magnetic field, receive and output detection signal; Described excitation is corresponding one by one with receiving element, and its quantity is at least three groups;
Signal processing unit is used to receive described detection signal, and according to described detection signal, the quality of assessment object under test.
2. device as claimed in claim 1 is characterized in that, described excitation and receiving element further comprise:
The exciting current receiving element is used to receive the exciting current of out of phase, produces rotation sweep magnetic field, by rotating magnetic field scanning object under test;
The detection signal receiving element is used to receive detection signal, and with described detection signal output.
3. an eddy current detection method is characterized in that, this method comprises:
The exciting current of out of phase is inputed in the different drive coils, and the quantity of described drive coil is at least three;
Produce rotating magnetic field;
Receiving coil receives and output detection signal, and according to described detection signal, the quality of assessment object under test.
4. method as claimed in claim 3 is characterized in that, described exciting current is a sine-wave current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100572772A CN101231268A (en) | 2008-01-31 | 2008-01-31 | Polyphase eddy detecting device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100572772A CN101231268A (en) | 2008-01-31 | 2008-01-31 | Polyphase eddy detecting device and method |
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| Publication Number | Publication Date |
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| CN101231268A true CN101231268A (en) | 2008-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008100572772A Pending CN101231268A (en) | 2008-01-31 | 2008-01-31 | Polyphase eddy detecting device and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095795A (en) * | 2010-12-29 | 2011-06-15 | 华南理工大学 | Multiphase multi-magnetic pole eddy current probe |
| CN111287733A (en) * | 2019-10-11 | 2020-06-16 | 中国石油大学(华东) | Method for detecting sucker rod of externally-penetrated rotating magnetic field well mouth |
| CN111360371A (en) * | 2020-03-09 | 2020-07-03 | 哈尔滨威尔焊接有限责任公司 | Method for detecting stability of gas shielded welding wire welding process |
| CN111842205A (en) * | 2020-06-24 | 2020-10-30 | 南京信息工程大学 | Nondestructive sorting method for metal materials |
-
2008
- 2008-01-31 CN CNA2008100572772A patent/CN101231268A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095795A (en) * | 2010-12-29 | 2011-06-15 | 华南理工大学 | Multiphase multi-magnetic pole eddy current probe |
| CN111287733A (en) * | 2019-10-11 | 2020-06-16 | 中国石油大学(华东) | Method for detecting sucker rod of externally-penetrated rotating magnetic field well mouth |
| CN111360371A (en) * | 2020-03-09 | 2020-07-03 | 哈尔滨威尔焊接有限责任公司 | Method for detecting stability of gas shielded welding wire welding process |
| CN111842205A (en) * | 2020-06-24 | 2020-10-30 | 南京信息工程大学 | Nondestructive sorting method for metal materials |
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Open date: 20080730 |