CN108956756A - A kind of highly sensitive ferromagnetic material lossless detection method and system - Google Patents
A kind of highly sensitive ferromagnetic material lossless detection method and system Download PDFInfo
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- CN108956756A CN108956756A CN201810919770.4A CN201810919770A CN108956756A CN 108956756 A CN108956756 A CN 108956756A CN 201810919770 A CN201810919770 A CN 201810919770A CN 108956756 A CN108956756 A CN 108956756A
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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
Abstract
A kind of highly sensitive ferromagnetic material lossless detection method, step include: one magnet field probe of setting, can be scanned in a planar range or some direction to sample to be tested；One mobile platform is set, energy band moving field probe or sample to be tested are moved according to being set on a planar range or some direction, move in magnet field probe the Distribution of Magnetic Field of sample to be tested is scanned；The electric signal transmission that magnet field probe measures gives signal detection processing module, and signal detection processing module is to the data for obtaining description magnetic field size distribution after the Electric signal processing measured；When the magnetic field of sample to be tested certain size wide-ultra crossed setting the change of divergence threshold value, then the range is marked, which is shown, and storing data.Not damaged to material in test process of the present invention, without magnetizing and contacting, defect detectable external and closely inside table is low in energy consumption, small in size, can be applicable to a variety of detection occasions.
Description
Technical field
The invention belongs to technical field of nondestructive testing, it is related to a kind of highly sensitive ferromagnetic material lossless detection method and system.
Background technique
Existing ferromagnetism non-destructive testing technology, predominantly osmosis, magnetic particle method, supercritical ultrasonics technology, X-ray or gamma ray
A few class methods such as method.Osmosis needs pre-cleaning, need to magnetize in advance or excitation, speed are slow, inconvenient；Magnetic particle method also needs in advance
Clean, magnetic and demagnetization need to be rushed, cleaning again and etc., speed is slow, inconvenient, cannot find internal relatively deeper defect and lead
The material of magnetic difference (such as austenitic steel)；The defect location of supercritical ultrasonics technology is relatively inaccurate；The spoke of X-ray or gamma ray method
Penetrate it is larger, it is risky to tester.
Non-contact pipeline magnetic detection method disclosed in existing patent CN103075641A, comprising the following steps: step 1,
Preliminary analysis determines the duration；Step 2, land clearing mark route；Step 3, pipe detection；The analysis of step 4, detection data
Processing；The processing of step 5, data result.Non-contact pipeline magnetic detection method of the invention overcomes existing contact detection
Various drawbacks in the method for pipeline local defect carry out cleaning demagnetization to pipeline if you need to blindly excavate, finally will also to pipeline into
The complicated processes of row uniform magnetization；Uniform magnetization is carried out to pipeline using earth magnetic field, is not required to carry out the surface of examined workpiece
Cleaning or other pretreatments, can detection on-line checking to workpiece surface, enormously simplify detection process, keep speed fast, imitate
Rate is high, and investigation depth is deepened significantly.The object that this method is directed to is longer, wider range pipeline of distance, is according to measurement
As a result it is compared with background magnetic field size distribution to obtain values of disparity, needs additionally to determine background value and comparison work,
Operating procedure and calculation amount are more.In magnetometer moving process, at least two three component sensors/simple component magnetic induction need to be used
Magnetic vector of the vector sensor in fixed position measurement rectangular co-ordinate, forms the tensor of magnetic field gradient, and magnetometer is logical
The mobile progress of operator's craft is crossed, and allows to deviate biggish distance, comparatively precision greatly reduces, thus the party
Method is unable to measure accurate ferromagnetic material and part, and the rapid batch detection being unable to reach on such as flow production line is wanted
It asks.
Summary of the invention
The invention proposes a kind of highly sensitive ferromagnetic material lossless detection method and system, this method measurements with higher
Range and higher signal frequency are corresponding；System accuracy is high, can pass through comprehensively control software automatically scanning and export and deposit
Store up test result；Can analyze in real time with display system detection data, can be according to Coordinate generation chromoscan figure, can Coutinuous store one
A scan period data；It is not damaged to material during the system testing, without magnetizing and contacting, it can detect external and close table
Internal defect, it is low in energy consumption, small in size, it can be applicable to a variety of detection occasions.
The technical solution adopted by the present invention is that:
A kind of highly sensitive ferromagnetic material lossless detection method, step include:
(1) magnet field probe is set, sample to be tested can be scanned in a planar range or some direction；
(2) be arranged a mobile platform, energy band moving field probe or sample to be tested according to be set in a planar range or
It is moved on some direction, magnet field probe is scanned the Distribution of Magnetic Field of sample to be tested in movement；
(3) electric signal transmission that magnet field probe measures gives signal detection processing module, and signal detection processing module is to survey
The data of description magnetic field size distribution are obtained after the Electric signal processing measured；
(4) the change of divergence threshold value for having crossed setting in certain size wide-ultra when the magnetic field of sample to be tested, then to the model
It encloses and is marked, which is shown, and storing data.The present invention can inside to material and appearance defect, and
Density of material is uneven or irregularities carries out Poul Dorset Sheep, and the result for passing through signal processing is intuitively shown
Show；Drive magnet field probe or sample to be tested mobile according to the parameter of setting by mobile platform, setting accuracy is high.It can divide in real time
Analysis with display system detection data, can according to Coordinate generation chromoscan figure, can one scan period data of Coutinuous store, data
It handles more flexible；It is not damaged to material in test process, without magnetizing and contacting, it can detect lacking inside external and nearly table
It falls into, it is low in energy consumption, small in size, it can be applicable to a variety of detection occasions.
It further, further include magnetic field number of the data with reference standard part for the magnetic field size distribution that will be obtained after step (3)
Compare according to collection, according to changes of magnetic field abnormal conditions, obtain the ordinary circumstance and abnormal conditions of the Distribution of Magnetic Field of sample to be tested, to
In the abnormal conditions of sample carry out magnetic field within the scope of certain size whether be more than setting the change of divergence threshold value judgement.
Further, the setting in step (2) includes scanning range, the parameter setting of scanning accuracy.
Further, the total magnet field probe of step (1) is highly sensitive magnet field probe.
Further, the carrier of the signal processing module in step (3) is embedded system or computer.
A kind of highly sensitive ferromagnetic material nondestructive detection system, it is characterised in that: including can be to the Distribution of Magnetic Field of sample to be tested
The magnet field probe being scanned, the magnet field probe that can be driven or the mobile platform of sample to be tested movement, the mobile platform and control
Make the platform control module connection of its movement, the magnet field probe and the data that it is measured exported after carrying out processing analysis and
Show the signal detection processing module connection of result and storing data.
Further, connecting component is provided on the mobile platform, the magnet field probe or sample to be tested are installed on connection
Component.
Further, the platform control module includes parameter setting module and drive module, and the drive module is according to pre-
If driving parameter mobile platform it is mobile.
Further, the parameter that the parameter setting module is related to includes scanning range, scanning accuracy.
Further, the signal detection processing module is embedded system or computer.
Further, the magnet field probe is a highly sensitive magnet field probe.
Beneficial effects of the present invention: can inside to material and appearance defect and density of material unevenly or not
Rule section carries out Poul Dorset Sheep, and the result for passing through signal processing is intuitively shown；Measurement range with higher,
High-intensity magnetic field can be surveyed with low-intensity magnetic field；Higher signal frequency is corresponding；Equipped with precision sweep platform, system accuracy is high；It can be certainly
It is dynamic to scan and export storage test result, high degree of automation；Can analyze in real time with display system detection data, can be according to coordinate
Generate chromoscan figure, can one scan period data of Coutinuous store, data processing is more flexible；To material during the system testing
Expect not damaged, without magnetizing and contact, can detect the defect inside external and nearly table, it is low in energy consumption, small in size, it can be applicable to more
Kind detection occasion.
Detailed description of the invention
Fig. 1 is system structure diagram of the invention.
Fig. 2 is the magnetic field profile schematic diagram of sample to be tested of the invention.
Specific embodiment
Next combined with specific embodiments below invention is further explained, but does not limit the invention to these tools
Body embodiment.One skilled in the art would recognize that present invention encompasses may include in Claims scope
All alternatives, improvement project and equivalent scheme.
Embodiment one
A kind of highly sensitive ferromagnetic material lossless detection method is present embodiments provided, step includes:
(1) a highly sensitive magnet field probe 1 is set, test sample can be treated in a planar range or some direction
Product are scanned；
(2) mobile platform 4 is set, and energy band moving field probe 1 or sample to be tested are according to the scanning range of setting, scanning
Precision moves in a planar range or some direction, and magnet field probe 1 carries out the Distribution of Magnetic Field of sample to be tested in movement
Scanning；
(3) for the electric signal transmission that magnet field probe 1 measures to signal detection processing module 2, signal detection processing module 2 is right
The data of description magnetic field size distribution are obtained after the Electric signal processing measured；
(4) the change of divergence threshold value for having crossed setting in certain size wide-ultra when the magnetic field of sample to be tested, then to the model
It encloses and is marked, which is shown, and storing data.
The carrier of signal processing module 2 in the present embodiment step (3) is embedded system or computer.
The sensitivity parameter of magnet field probe in the present embodiment, for example it is better than 10nT/Hz1/2(1nT=10-9T, T: Te Si
It draws).Magnet field probe type can be based on magnetic resistance (such as: incorgruous magnetic resistance AMR or giant magnetoresistance GMR), or be based on fluxgate or base
In magneto-optic effect, or it is based on optical pumping Magnetic Measurement Technology, or is based on fibre optic magnetic field sensing technology.
The present invention being capable of inside to material and appearance defect and density of material is uneven or irregularities carries out
Poul Dorset Sheep, and the result for passing through signal processing is intuitively shown；It is driven by mobile platform according to the parameter of setting
Magnet field probe or sample to be tested are mobile, and setting accuracy is high.Can analyze in real time with display system detection data, can be raw according to coordinate
At chromoscan figure, can one scan period data of Coutinuous store, data processing is more flexible；It is lossless to material in test process
Wound, without magnetizing and contacting, defect detectable external and closely inside table is low in energy consumption, small in size, can be applicable to a variety of detections
Occasion.
Embodiment two
The present embodiment and embodiment one the difference is that, further include the magnetic field size distribution that will be obtained after step (3)
Data compared with the magnetic field data collection of reference standard part, according to changes of magnetic field abnormal conditions, obtain the magnetic field point of sample to be tested
The ordinary circumstance and abnormal conditions of cloth, in the abnormal conditions of sample to be tested carry out magnetic field within the scope of certain size whether be more than
The judgement of the change of divergence threshold value of setting.It is first compared one anticipation of progress with the magnetic field data collection of reference standard part, obtains
To the abnormal conditions of the Distribution of Magnetic Field of a sample to be tested, the judgement of size range is carried out again in abnormal conditions, improve detection
Efficiency.
Embodiment three
Referring to Fig. 1, a kind of highly sensitive ferromagnetic material nondestructive detection system is present embodiments provided, including can be to sample to be tested
The Distribution of Magnetic Field highly sensitive magnet field probe 1 being scanned, the movement moved of the magnet field probe 1 that can drive or sample to be tested
Platform 4, the mobile platform 4 are connect with the platform control module 5 for controlling its movement, and the platform control module 5 includes parameter
Setup module and drive module, the drive module is mobile according to preset driving parameter mobile platform 4, the parameter setting mould
The parameter that block is related to includes scanning range, scanning accuracy, and the drive module is precision electric motor；The magnet field probe 1 with to it
The data measured export after carrying out processing analysis and the connection of signal detection processing module 2 of display result and storing data.
Connecting component 3 is provided on mobile platform 4 described in the present embodiment, the magnet field probe 1 or sample to be tested are installed on
Connecting component 3.When magnet field probe 1 is mounted in connecting component 3, magnet field probe 1 with mobile platform 3 movement, to placement
Sample to be tested near magnet field probe 1 is scanned detection.It is also possible to sample to be tested to be mounted in connecting component 3, together
As mobile platform 4 is mobile in the range by the fixed magnet field probe 1 of near position, it is scanned detection.
Signal detection processing module 2 described in the present embodiment is embedded system or computer.
The sensitivity parameter of magnet field probe in the present embodiment, for example it is better than 10nT/Hz1/2(1nT=10-9T, T: Te Si
It draws).Magnet field probe type can be based on magnetic resistance (such as: incorgruous magnetic resistance AMR or giant magnetoresistance GMR), or be based on fluxgate or base
In magneto-optic effect, or it is based on optical pumping Magnetic Measurement Technology, or is based on fibre optic magnetic field sensing technology.
One concrete application of the present embodiment is as follows:
Magnet field probe 1 is mounted in connecting component 3, connecting component 3 is mounted on mobile platform 4, according to embodiment one
The highly sensitive ferromagnetic material lossless detection method detects sample to be tested, is arranged by platform control module 5 and is moved
The scanning range of platform 4 is 0-5mm, and the data obtained after the completion of the scanning of magnet field probe 1 are carried out by signal detection processing module 2
Measurement is handled with analysis, obtains magnetic field profile figure shown in Fig. 2, and wherein transverse and longitudinal unit is opposite arbitrary unit, opposite position
Setting range is 0-5, and relative intensity range is 0-10.
In Fig. 2:
Relative position be 2.1-2.6 within the scope of relative magnetic field strength size variation amplitude be more than difference given threshold (>
0.5)；
Relative position is that the amplitude of relative magnetic field strength size variation within the scope of 3.5-4.0 has been more than what Long-term change trend was predicted
Difference given threshold (> 0.5).
Two above zone marker is those suspected defects position.
Sample to be tested in the present invention is the ferromagnetic material and part of small volume, and used method is that basis measures
Magnitude of field intensity analysis and trend prediction are carried out with respect to situation of change, can disposably measure and obtain a result；This
Magnet field probe or sample to be tested are positioned using precise mobile platform in invention, positioning accuracy and Measurement Resolution compared with
It is high.The present invention can have purposes in the related industry such as industrial detection, civilian, such as detecting the inside and outside of metal parts automatically
Defect detects the variation of periphery electromagnetic environment, metallic conduit internal flaw etc..
The present invention can defect to material and irregularities carry out Poul Dorset Sheep, and the knot by signal processing
Fruit is intuitively shown.Measurement range with higher and higher signal frequency are corresponding.System accuracy is high, can lead to
It crosses comprehensively control software automatically scanning and exports storage test result.Can analyze in real time with display system detection data, can basis
Coordinate generation chromoscan figure, can one scan period data of Coutinuous store., nothing not damaged to material during the system testing
It need to magnetize and contact, can detect the defect inside external and nearly table, it is low in energy consumption, small in size, it can be applicable to a variety of detection occasions.
It is relatively easy it is easy-to-use, cost is controllable, structure is reliable, the relevant technologies expection is bound to generate positive influence to domestic technique market.
Claims (10)
1. a kind of highly sensitive ferromagnetic material lossless detection method, step include:
(1) magnet field probe is set, sample to be tested can be scanned in a planar range or some direction；
(2) mobile platform, energy band moving field probe or sample to be tested are set according to being set in planar range or a certain
It is moved on a direction, magnet field probe is scanned the Distribution of Magnetic Field of sample to be tested in movement；
(3) electric signal transmission that magnet field probe measures gives signal detection processing module, and signal detection processing module is to measuring
Electric signal processing after obtain description magnetic field size distribution data；
(4) when the magnetic field of sample to be tested certain size wide-ultra crossed setting the change of divergence threshold value, then to the range into
Line flag shows the label, and storing data.
2. a kind of highly sensitive ferromagnetic material lossless detection method according to claim 1, it is characterised in that: after step (3)
It further include the data by the magnetic field size distribution of acquisition compared with the magnetic field data collection of reference standard part, according to changes of magnetic field exception
Situation obtains the ordinary circumstance and abnormal conditions of the Distribution of Magnetic Field of sample to be tested, magnetic is carried out in the abnormal conditions of sample to be tested
Within the scope of certain size whether be more than setting the change of divergence threshold value judgement.
3. a kind of highly sensitive ferromagnetic material lossless detection method according to claim 1, it is characterised in that: in step (2)
Setting include scanning range, the parameter setting of scanning accuracy.
4. a kind of highly sensitive ferromagnetic material lossless detection method according to claim 1, it is characterised in that: step (1) is total
Magnet field probe be highly sensitive magnet field probe.
5. a kind of highly sensitive ferromagnetic material lossless detection method described according to claim 1~one of 4, it is characterised in that: step
Suddenly the carrier of the signal processing module in (3) is embedded system or computer.
6. a kind of highly sensitive ferromagnetic material nondestructive detection system, it is characterised in that: including can Distribution of Magnetic Field to sample to be tested into
The mobile platform of the magnet field probe of row scanning, the magnet field probe that can be driven or sample to be tested movement, the mobile platform and control
Its platform control module moved connection, the magnet field probe and the data measured it are exported and are shown after carrying out processing analysis
Show the signal detection processing module connection of result and storing data.
7. a kind of highly sensitive ferromagnetic material nondestructive detection system according to claim 6, it is characterised in that: the movement is flat
Connecting component is provided on platform, the magnet field probe or sample to be tested are installed on connecting component.
8. a kind of highly sensitive ferromagnetic material nondestructive detection system according to claim 7, it is characterised in that: the platform control
Molding block includes parameter setting module and drive module, and the drive module is mobile according to preset driving parameter mobile platform,
The parameter that the parameter setting module is related to includes scanning range, scanning accuracy.
9. a kind of highly sensitive ferromagnetic material nondestructive detection system according to one of claim 6~8, it is characterised in that: institute
Stating signal detection processing module is embedded system or computer.
10. a kind of highly sensitive ferromagnetic material nondestructive detection system according to claim 9, it is characterised in that: the magnetic field
Probe is a highly sensitive magnet field probe.
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| CN112362726A (en) * | 2020-10-09 | 2021-02-12 | 郑州大学 | Device and method for detecting internal defects of building material based on magnetic particles |
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