CN109490406A - Dynamic magnetic detection system, detection method and electromagnetism control battle array method - Google Patents
Dynamic magnetic detection system, detection method and electromagnetism control battle array method Download PDFInfo
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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
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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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
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Abstract
The present invention provides a kind of dynamic magnetic detection system, detection method and electromagnetism control battle array method, the system comprises: magnetic field applicator, for applying magnetic field to ferromagnetic determinand；Dynamic magnetic actuation means, for generating transient state excitation field；Field detecting device, for detecting the induction magnetic signal around determinand.A kind of dynamic magnetic detection system provided by the invention and method can detecte the lesser defect of scale and precision is higher, and detection performance keeps stablizing under high-speed mobile.
Description
Technical field
The present invention relates to electronic information technical field more particularly to a kind of dynamic magnetic detection systems, detection method and electromagnetism
Control battle array method.
Background technique
Industrialization, the functionization of oil-gas pipeline defect inner detection technique and equipment are significant.
Magnetic Flux Leakage Inspecting is the current established defect of pipeline inner detection technique of industry both at home and abroad.Magnetic Flux Leakage Inspecting technology is based on forever
The stationary magnetic field that magnet provides magnetizes detection zone tube wall, is measured by magnetic field sensing elements such as Hall sensors by wall defects
Generated magnetic leakage signal identifies defect of pipeline information according to magnetic leakage signal feature.
Magnetic Flux Leakage Inspecting can only generally detect the biggish defects of scales such as corrosion, and defect lesser for scales such as crackles is examined
It is very poor to survey precision.
Summary of the invention
Based on this, it is necessary in view of the above technical problems, it is with high accuracy dynamic to provide a kind of pair of lesser defects detection of scale
State magnetic detection system, detection method and electromagnetism control battle array method, wherein the system comprises:
Magnetic field applicator, for applying magnetic field to ferromagnetic determinand；
Dynamic magnetic actuation means, for generating transient state excitation field；
Field detecting device, for detecting the induction magnetic signal around determinand.
In one embodiment, the magnetic field applicator includes permanent magnet or electromagnet.
In one embodiment, the dynamic magnetic actuation means include dynamic magnetic excitation coil.
In one embodiment, the dynamic magnetic detection system further includes high-frequency electrical pulses flow generating apparatus, is moved with described
Magnetic actuation means electrical connection.
In one embodiment, the high-frequency electrical pulses flow generating apparatus includes metal oxide semiconductor field effect transistor
Pipe, for generating pulse current, it is respectively 0.05- that the pulsewidth of the pulse excitation electric current, which is 1-5 μ s, rising edge and failing edge,
0.2μs。
In one embodiment, the field detecting device includes receiving coil, and the receiving coil is differential received line
Circle, the differential received coil include the first receiving coil and the second receiving coil, and first receiving coil and second receive
Coil is oppositely wound, and first receiving coil and the second receiving coil join end to end.
In one embodiment, the dynamic magnetic detection system further includes the Martin Hilb connecting with the field detecting device
Special converter, for the magnetic signal to be carried out Hilbert variation.
In one embodiment, the dynamic magnetic detection system further include:
First low-noise amplifier is arranged between the Hilbert transformer and the field detecting device；
Second low-noise amplifier is connected to the Hilbert transformer signal output end；
Low-pass filter is arranged between the Hilbert transformer and second low-noise amplifier.
In one embodiment, the dynamic magnetic detection system further includes leakage magnetic detection device, the leakage magnetic detection device
For multichannel Hall chip array, each channel includes the Hall chip of three vertical direction of X, Y, Z axis, for detecting space leakage
Magnetic signal.
In one embodiment, the dynamic magnetic detection system further include:
Control device, for control the magnetic field applicator, the dynamic magnetic actuation means, the field detecting device,
The leakage magnetic detection device and the Hilbert transformer.
The present invention also provides a kind of dynamic magnetic detection methods, which comprises
Magnetic field is applied to determinand, the determinand is made to enter magnetic saturation state；
Transient state excitation field is applied to determinand；
After being superimposed the transient state excitation field, the magnetic signal around the detection object is detected.
In one embodiment, after the superposition transient state excitation field, the magnetic signal around the detection object is detected
The step of, further includes:
The magnetic signal is subjected to Hilbert transform and output waveform signals by Hilbert transformer；
Judge whether the determinand has defect according to the waveform signal.
In one embodiment, further includes: 3 d-space field signal is acquired by leakage magnetic detection device, and to described three
Dimension space magnetic signal is analyzed, and defect condition is obtained.
In one embodiment, the transient state excitation field is generated by dynamic magnetic actuation means, passes through high-frequency pulse current
Generating device is connect with the dynamic magnetic actuation means, is 1-5 μ s, rising edge and decline to the dynamic magnetic actuation means input pulsewidth
Along the respectively pulse excitation electric current of 0.05-0.2 μ s to generate transient state excitation field.
The present invention also provides a kind of electromagnetism control battle array methods, comprising:
There is provided multiple claims any aforementioned dynamic magnetic detection system；
By control system, the dynamic magnetic detection system is carried out by sequential control array using sequential control method
Control.
Dynamic magnetic detection system provided by the present invention, magnetic field applicator apply magnetic field to ferromagnetic determinand
So that determinand is entered magnetic saturation state, moves magnetic actuation means on determinand surface and generate transient state excitation field, field detecting device
Detect the induction magnetic signal of the field detecting device position.If determinand has when smaller scale defect by detecting
Magnetic signal provide defect information compared with magnetic signal when zero defect.The present invention can detecte the lesser defect of scale and precision
It is higher.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the magnetic field sensing system of one embodiment；
Fig. 2 is the structure chart of the magnetic field sensing system of one embodiment handled dynamic magnetic signal；
Fig. 3 is the structural schematic diagram of the magnetic field sensing system of another embodiment；
Fig. 4 is the flow chart of the dynamic magnetic detection method of the dynamic magnetic detection system of one embodiment；
Fig. 5 is the BH curve evolution diagram of determinand when magnetic field applicator applies magnetic field；
Fig. 6 is defect Distribution of Magnetic Field figure at the outer surface of the determinand；
Fig. 7 is defect Distribution of Magnetic Field figure in the inner surface of the determinand；
Fig. 8 is defect measurement voltage data in material inner surface；
Fig. 9 is defect measurement voltage data in outer surface；
Dynamic magnetic signal voltage develops when Figure 10 is different movement speeds；
Figure 11 is the sequential control array schematic diagram of the electromagnetism control battle array method of one embodiment.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, right with reference to the accompanying drawings and embodiments
Technical solution of the present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain
Technical solution of the present invention, the technical solution being not intended to limit the present invention.
Referring to Fig. 1, being a kind of magnetic field sensing system 10 provided by one embodiment of the present invention, comprising: magnetic field applies dress
Set 100, dynamic magnetic actuation means 200 and field detecting device 300.The magnetic field applicator 100 is used for ferromagnetic
Determinand 900 applies magnetic field.The dynamic magnetic actuation means 200 are for generating transient state excitation field.The field detecting device 300
For detecting the induction magnetic signal of 300 position of field detecting device.
The magnetic field applicator 100 applies magnetic field to ferromagnetic determinand 900, reaches the determinand 900
To magnetic saturation state, there is stationary magnetic field at this time around the determinand.The dynamic magnetic actuation means 200 are arranged described to be measured
900 surface of object, generates a direction perpendicular to the stationary magnetic field and magnetic field strength swashs much smaller than the transient state of the stationary magnetic field
Exciting field.The field detecting device 300 detects the dynamic magnetic response that the transient state excitation field is caused and obtains the magnetic field spy
Survey the magnetic signal of 300 position of device.The magnetic signal includes earth magnetic field signal, magnetic field applicator and dynamic magnetic pumping dress
Set the magnetic signal etc. of initiation.The field detecting device 300 can be existing magnetic field measuring apparatus, or a conductor wire
Circle or multiple conductive coils etc..
In one embodiment, the dynamic magnetic actuation means 200 and field detecting device 300 can integrate, together
It is removably set near the determinand 900 provided with the magnetic field applicator 100.
Dynamic magnetic detection system 10 provided by the present invention, the magnetic field applicator 100 is to ferromagnetic to be measured
Object, which applies magnetic field, makes determinand enter magnetic saturation state, and the dynamic magnetic actuation means 200 generate transient state excitation on determinand surface
Magnetic field, the field detecting device 300 detect the magnetic signal of 300 position of field detecting device.Determinand have compared with
Small dimensional defects can be showed by the magnetic signal variation detected.The present invention can detecte the lesser defect of scale and precision
It is higher.
In one embodiment, the magnetic field applicator 100 is permanent magnet or electromagnet.The magnetic field applicator
100 may be that other make the magnetized equipment of the determinand.
In one embodiment, the dynamic magnetic actuation means 200 are dynamic magnetic excitation coil.
In one embodiment, the magnetic field sensing system 10 further includes high-frequency electrical pulses flow generating apparatus 210, and described
Dynamic magnetic actuation means electrical connection makes the dynamic magnetic actuation means generate induction wink for being passed through electric current to the dynamic magnetic actuation means
When magnetic field.The dynamic magnetic actuation means can also be passed through electric current, such as alternating current of the variation of other equipment generation.In a reality
It applies in example, the high-frequency electrical pulses flow generating apparatus 210 includes Metal Oxide Semiconductor Field Effect Transistor (MOSFET), is used
In generating pulse current, it is respectively 0.05-0.2 μ s that the pulsewidth of the pulse excitation electric current, which is 1-5 μ s, rising edge and failing edge,.
Preferably, by controlling the switch of Metal Oxide Semiconductor Field Effect Transistor, generation pulsewidth is 1-5 μ s, raising and lowering
Along the pulse excitation electric current for being 0.05-0.2 μ s.In one embodiment, the metal oxide semiconductor field effect transistor
The switch of pipe is by program real-time control.When pulse current failing edge carries out detection of magnetic field, the magnetic signal signal-to-noise ratio that can obtain
It is higher.
Referring to Fig. 2, in one embodiment, the field detecting device 300 is receiving coil, the receiving coil is
Differential received coil, the differential received coil include the first receiving coil 310 and the second receiving coil 320, and described first connects
Take-up circle 310 and the second receiving coil 320 are oppositely wound, and 320 head and the tail of first receiving coil 310 and the second receiving coil
It is connected.The coil that this mode designs can effectively eliminate interference magnetic signal, improve the signal-to-noise ratio of dynamic magnetic signal.
In one embodiment, the magnetic field sensing system 10 further includes the institute connecting with the field detecting device 300
Hilbert transformer 400 is stated, for the magnetic signal to be carried out Hilbert variation.
Specifically, the field detecting device 300 receives the transient state excitation field that the dynamic magnetic actuation means 200 generate.
The Hilbert transformer 400 receives the magnetic signal that the field detecting device 300 exports, and carries out Xi Er to the magnetic signal
It is exported after Bert variation.The magnetic signal of the Hilbert variator 400 exported using the field detecting device 300 is improved
Signal-to-noise ratio, extend the effect of the magnetic signal observation time, analog information conversion.
In one embodiment, the magnetic field sensing system 10 further include: the first low-noise amplifier 510, the second low noise
Acoustic amplifier 520 and low-pass filter 530.First low-noise amplifier 510 is arranged in the Hilbert transformer 400
Between the field detecting device 300.Second low-noise amplifier 520 is connected to the Hilbert transformer 400
Signal output end.The low-pass filter 530 is arranged in the Hilbert transformer 400 and second low-noise amplifier
Between 520.By using first low-noise amplifier 510, second low-noise amplifier 520 and the low-pass filtering
Device 530, final output signal is more accurate.
Referring to Fig. 3, in one embodiment, the magnetic field sensing system 10 further includes leakage magnetic detection device 600, described
Leakage magnetic detection device 600 is multichannel Hall chip array, and each channel includes the Hall core of three vertical direction of X, Y, Z axis
Piece, for detecting space magnetic leakage signal.In use, being arranged the leakage magnetic detection device 600 inside the determinand.Fusion
After Magnetic Flux Leakage Inspecting, makes the magnetic field sensing system 10 that can detect pipeline and wait the defect for surveying large scale on object that can detect small ruler again
Defect is spent, application range and precision are improved.
In one embodiment, the magnetic field sensing system 10 further include: control device (not shown), it is described for controlling
Magnetic field applicator 100, the dynamic magnetic actuation means 200, the field detecting device 300, the leakage magnetic detection device 600.
In one embodiment, the control device can also control the magnetic field applicator 100, the dynamic magnetic actuation means simultaneously
200, the field detecting device 300, the leakage magnetic detection device 600 and the Hilbert transformer 400 or other described in
Equipment in magnetic field sensing system 10.In one embodiment, the control device 800 control the leakage magnetic detection device 600,
The magnetic field applicator 100, the dynamic magnetic actuation means 200 and the field detecting device 300.By distributing collecting work
Timing reduces the instantaneous operating current of system, all collecting works is expeditiously completed in time window short enough, so that whole
A dynamic magnetic detection system collecting efficiency is high, low in energy consumption, safety is good.
Referring to Fig. 4, the present invention also provides a kind of dynamic magnetic detection methods, which comprises
S100 applies magnetic field to determinand, the determinand is made to enter magnetic saturation state；
S200 applies transient state excitation field to determinand；
S300 after being superimposed the transient state excitation field, detects the magnetic signal around the detection object.
In one embodiment, after the step S300 further include:
The magnetic signal is carried out Hilbert transform and output waveform signals by Hilbert transformer by S400；
S500 judges whether the determinand has defect according to the waveform signal.
The dynamic magnetic detection method in one of the embodiments, further include:
S110 acquires 3 d-space field signal by leakage magnetic detection device, and carries out to the three-dimensional space magnetic signal
Analysis obtains defect condition.
The dynamic magnetic detection method in one of the embodiments, further include:
S110, by high-frequency electrical pulses flow generating apparatus, generating pulsewidth is that 1-5 μ s, rising edge and failing edge are respectively
The pulse excitation electric current of 0.05-0.2 μ s；
S120, the pulse excitation electric current are passed through conductive coil, to generate transient state excitation field.
10 concrete application process of magnetic field sensing system of the present invention are as follows:
By the control device open the magnetic field applicator 100 to determinand apply magnetic field make the determinand into
Enter magnetic saturation state.Then the magnetic leakage signal that the leakage magnetic detection device 600 detects three-dimensional space is opened in control device control.Institute
It states control device control and successively opens the magnetic field applicator 100, the dynamic magnetic actuation means 200, detection of magnetic field dress
Set 300, first low-noise amplifier 510, the Hilbert transformer 400, the low-pass filter 530 and described
Two low-noise amplifiers 520 start dynamic Magnetic testi and obtain magnetic signal.
Finally the magnetic signal of second low-noise amplifier 520 output is analyzed, meanwhile, analyze the leakage field letter
Number.
Referring to Fig. 5, magnetic field applicator apply magnetic field when determinand BH curve evolution diagram.When ferromagnetic described
When determinand is by outer application high-intensity magnetic field saturated magnetization, the BH curve operating point of the determinand on quiescent point Q (B, H),
Zone of saturation of the operating point on BH curve.Magnetic induction when further increasing outer application magnetic field H, inside the determinand
Intensity B increases slowly, into saturation state.At this point, adding a dynamic magnetic pumping b perpendicular to the direction for applying a H outside, then it is described to
The dynamic working point for surveying object is moved to Q'(B+b, H+h).
Referring to Fig. 6, defect Distribution of Magnetic Field figure at the outer surface of the determinand.When defect is in the outer of the determinand
When surface, near the inner surface of the determinand, transient state excitation field will be generated.Due to applying magnetic outside material opening edge
Field leaks, and turns to dynamic magnetic pumping direction by original moving direction, therefore the transient state excitation field of defect opening edge is close
Degree is bigger than the transient state excitation field density at two side position of defect, as shown in fig. 6, circle shows more greatly transient state excitation field density
It is bigger.
Referring to Fig. 7, defect Distribution of Magnetic Field figure in the inner surface of the determinand.When defect appears in the determinand
Inner surface when, the air section of defective locations, magnetic conductivity becomes air permeability, and conductivity is reduced to 0, recess due to wink
Farther out, the density of the transient state excitation field of generation reduces the distance of state excitation field, and as described in Figure 7, circle is smaller to show transient state
Excitation field density is smaller.
When defect is in the exterior surface to be measured, at interior surface location, defect edge and internal transient state excitation field
Density is big, the small feature of defect two sides transient state excitation field density；When defect is in inner surface, then defect edge and inside is presented
Transient state excitation field density is small, the big feature of defect two sides transient state excitation field density.
Further, transient state excitation field variable density trend caused by the inner and outer surfaces defect of direction is moved along just
On the contrary, using the dynamic magnetic pumping and differential received, realizing the inner and outer surfaces under high-speed moving state using this feature
The reliable detection of defect, and distinguish the function of defect inner and outer surfaces distribution (ID/OD).
Referring to Fig. 8, defect measurement voltage data in material inner surface.Measured data shows when defect is in material
When surface, the magnetic signal output waveform for moving along direction is first negative envelope, after be positive envelope.
Referring to Fig. 9, defect measurement voltage data in the exterior surface to be measured.Measured data shows to exist when defect
When the exterior surface to be measured, waveform of the magnetic signal after difference output, Hilbert transform be first positive, after be negative；Further
Ground, the length interval of positive and negative waveform peak and the length dimension of defect are very close, this shows that pre-post difference divides receiving coil to scarce
Length sides are fallen into along very sensitive, the transient state excitation field density also demonstrated at this location varies widely.
Referring to Fig. 10, magnetic signal voltage develops when different movement speeds.Abscissa is moving direction, and unit is millimeter
(mm), ordinate is magnetic signal voltage, and unit is volt (V).From fig. 10 it can be seen that being surveyed when the magnetic field sensing system 10 is practical
When the movement speed range of amount is 1-8m/s, the difference output waveform of the same defect is substantially overlapping, the shadow by movement speed
Sound is smaller.It can be realized the reliable and stable detection under high-speed moving state.And the magnetic field sensing system 10 is in high-speed mobile
Lower detection performance keeps stablizing.
Figure 11 is please referred to, the present embodiment also provides a kind of electromagnetism control battle array method, comprising:
S100 ' provides multiple any dynamic magnetic detection systems above-mentioned；
S200 ' is by control system, using sequential control method by sequential control array to the dynamic magnetic detection system
System is controlled.
Specifically, the corresponding dynamic magnetic detection system of each module in Figure 11.Control module is control system
For control module.The control module distributes specific collecting work timing control different described dynamic by sequential control method
State magnetic detection system.In one embodiment, multiple modules can be grouped.It is controlled respectively by sequential control method.Institute
It states sequential control array described in electromagnetism control battle array method to refer to using sequential triggering mode, passes through reasonable distribution working sequence, sequence
The work for starting each module is passed through, the instantaneous operating current of system is reduced, is expeditiously completed in time window short enough all
Module collecting work, so that entire detection system collecting efficiency is high, low in energy consumption, safety is good.
In several embodiments provided by the present invention, it should be understood that disclosed relevant apparatus and method, Ke Yitong
Other modes are crossed to realize.For example, Installation practice described above is only illustrative, for example, the module or unit
Division, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or group
Part can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown
Or the mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, device or unit it is indirect
Coupling or communication connection can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, described program can be stored in a computer-readable storage medium
In, in the embodiment of the present invention, described program be can be stored in the storage medium of computer system, and by the computer system
In at least one processor execute, to realize including process such as the embodiment of above-mentioned each method.Wherein, the storage medium
It can be magnetic disk, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random
Access Memory, RAM) etc..
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (15)
1. a kind of dynamic magnetic detection system characterized by comprising
Magnetic field applicator, for applying magnetic field to ferromagnetic determinand；
Dynamic magnetic actuation means, for generating transient state excitation field；
Field detecting device, for detecting the induction magnetic signal around determinand.
2. dynamic magnetic detection system as described in claim 1, which is characterized in that the magnetic field applicator includes permanent magnet
Or electromagnet.
3. dynamic magnetic detection system as described in claim 1, which is characterized in that the dynamic magnetic actuation means include dynamic magnetic pumping
Coil.
4. dynamic magnetic detection system as described in claim 1, which is characterized in that the dynamic magnetic detection system further includes high frequency
Pulse current generating device is electrically connected with the dynamic magnetic actuation means.
5. dynamic magnetic detection system as claimed in claim 4, which is characterized in that the high-frequency electrical pulses flow generating apparatus includes
Metal Oxide Semiconductor Field Effect Transistor, for generating pulse current, the pulsewidth of the pulse excitation electric current be 1-5 μ s,
Rising edge and failing edge are respectively 0.05-0.2 μ s.
6. dynamic magnetic detection system as described in claim 1, which is characterized in that the field detecting device includes receiving line
Circle, the receiving coil are differential received coil, and the differential received coil includes the first receiving coil and the second receiving coil,
First receiving coil and the second receiving coil are oppositely wound, and first receiving coil and the second receiving coil head and the tail phase
Even.
7. dynamic magnetic detection system as described in claim 1, which is characterized in that the dynamic magnetic detection system further includes and institute
The Hilbert transformer for stating field detecting device connection, for the magnetic signal to be carried out Hilbert variation.
8. dynamic magnetic detection system as claimed in claim 7, which is characterized in that the dynamic magnetic detection system further include:
First low-noise amplifier is arranged between the Hilbert transformer and the field detecting device；
Second low-noise amplifier is connected to the Hilbert transformer signal output end；
Low-pass filter is arranged between the Hilbert transformer and second low-noise amplifier.
9. dynamic magnetic detection system as claimed in claim 7, which is characterized in that the dynamic magnetic detection system further includes leakage field
Detection device, the leakage magnetic detection device are multichannel Hall chip array, and each channel includes three vertical direction of X, Y, Z axis
Hall chip, for detecting space magnetic leakage signal.
10. dynamic magnetic detection system as claimed in claim 9, which is characterized in that the dynamic magnetic detection system further include:
Control device, for controlling the magnetic field applicator, the dynamic magnetic actuation means, the field detecting device, described
Leakage magnetic detection device and the Hilbert transformer.
11. a kind of dynamic magnetic detection method, which is characterized in that the described method includes:
Magnetic field is applied to determinand, the determinand is made to enter magnetic saturation state；
Transient state excitation field is applied to determinand；
After being superimposed the transient state excitation field, the magnetic signal around the detection object is detected.
12. dynamic magnetic detection method as claimed in claim 11, which is characterized in that the superposition transient state excitation field
Afterwards, the step of detecting the magnetic signal around the detection object, further includes:
The magnetic signal is subjected to Hilbert transform and output waveform signals by Hilbert transformer；
Judge whether the determinand has defect according to the waveform signal.
13. dynamic magnetic detection method as claimed in claim 11, which is characterized in that further include:
3 d-space field signal is acquired by leakage magnetic detection device, and the three-dimensional space magnetic signal is analyzed, is obtained
Defect condition.
14. dynamic magnetic detection method as claimed in claim 11, which is characterized in that the transient state excitation field is swashed by dynamic magnetic
Device generation is encouraged, is connect by high-frequency electrical pulses flow generating apparatus with the dynamic magnetic actuation means, to the dynamic magnetic actuation means
Input pulsewidth is that 1-5 μ s, rising edge and failing edge are respectively the pulse excitation electric current of 0.05-0.2 μ s to generate transient state excitation magnetic
?.
15. a kind of electromagnetism control battle array method characterized by comprising
Any dynamic magnetic detection system of multiple claim 1-10 is provided；
By control system, the dynamic magnetic detection system is controlled by sequential control array using sequential control method
System.
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| PCT/CN2017/114485 WO2019047396A1 (en) | 2017-09-11 | 2017-12-04 | Dynamic magnet detection system and detection method, and electromagnetic array control method |
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| CN111307933A (en) * | 2020-04-15 | 2020-06-19 | 新兴铸管股份有限公司 | Nondestructive testing method for cast steel pipe |
| CN113984857A (en) * | 2021-10-27 | 2022-01-28 | 清华大学 | Metal loss defect detection device and detection method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110470726B (en) * | 2019-08-14 | 2023-03-07 | 中国特种设备检测研究院 | Steel pipeline defect detection method and device based on multi-frequency electromagnetism |
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| CN109490406B (en) | 2020-11-20 |
| WO2019047396A1 (en) | 2019-03-14 |
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