CN107271536A - Based on coercitive ferrimagnet electromagnetic nondestructive detection system and detection method - Google Patents
Based on coercitive ferrimagnet electromagnetic nondestructive detection system and detection method Download PDFInfo
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- CN107271536A CN107271536A CN201710438187.7A CN201710438187A CN107271536A CN 107271536 A CN107271536 A CN 107271536A CN 201710438187 A CN201710438187 A CN 201710438187A CN 107271536 A CN107271536 A CN 107271536A
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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
Abstract
Based on coercitive ferrimagnet electromagnetic nondestructive detection system and detection method, belong to ferrimagnet electromagnetic nondestructive field.Including being tested ferrimagnet（4）, it is characterised in that：It is provided with microprocessor module, analog-to-digital conversion module, pumping signal and occurs module, collection period control module, Signal-regulated kinase, power amplifier module, magnetic survey probe module and sampling resistor module, and following steps：Step 1, selection standard ferromagnetic material；Step 2, the magnetic hysteresis loop of standard ferromagnetic material is obtained；Step 3, tested ferrimagnet is obtained（4）Magnetic hysteresis loop；Step 4, it is determined that tested ferrimagnet（4）Internal stress degree.Coercitive ferrimagnet electromagnetic nondestructive detection system and detection method are based on by this, internal stress situation that can be more precisely to ferrimagnet detect that circuit structure is more succinct simultaneously.
Description
Technical field
Based on coercitive ferrimagnet electromagnetic nondestructive detection system and detection method, belong to ferrimagnet electromagnetism without
Damage detection field.
Background technology
Ferrimagnet is as a kind of important construction material, and it is widely used in the every field such as petrochemical industry production,
Such as transport line, storage tank, boiler.When being made due to material during internal stress remaining in itself and materials'use by
To applied stress build up, can cause material structure occur stress defect, cause the generation of security incident.Therefore, use
A kind of fast and effectively method makes safety evaluation to the stress defect of ferrimagnet to be had for prevention security incident
Important meaning.
At this stage, ferrimagnet safety detection is based on lossless detection method, electromagnetic nondestructive with detection speed it is fast,
Harmless the advantages of, is more and more widely used.Conventional electromagnetic nondestructive method mainly has eddy current detection method, metallic magnetic
Remember detection, Barkhausen's detection method etc., but above-mentioned detection method of the prior art is provided with its respective defect, tool
For body：（1）Detection method of eddy extensive use in practice, but still further research is still needed in terms of quantitative analysis, become
Skin effect influence is larger.（2）Metal magnetic memory detecting method is relative to eddy current detection method, it is not necessary to magnetizing assembly, ferromagnetism
Material is under earth magnetism and alternate load effect, in ferromagnetism surface of test piece formation stray field, surface stray field " memory " part
Defect stress concentrated position, reach the purpose of stress mornitoring, but accuracy of detection is not accurate enough.（3）Barkhausen's detection method
Cleaning Principle be ferrimagnet under the magnetic fields of outside alternation, the discontinuous fortune with great-jump-forward that neticdomain wall occurs
Dynamic, it, which produces electromagnetic induction noise, can reflect the stress of ferrimagnet.But this method be affected by the external environment compared with
Greatly, signal isolation, extraction difficulty are larger.
The content of the invention
The technical problem to be solved in the present invention is：Overcome the deficiencies in the prior art can be more succinct with structure there is provided one kind,
Simultaneously can be more precisely to ferrimagnet internal stress situation detected based on coercitive ferrimagnet
Electromagnetic nondestructive detection system and detection method.
The technical solution adopted for the present invention to solve the technical problems is：Should based on coercitive ferrimagnet electromagnetism without
Damage detecting system, including tested ferrimagnet, it is characterised in that：It is provided with microprocessor module, analog-to-digital conversion module, excitation
Signal generating module, collection period control module, Signal-regulated kinase, power amplifier module, magnetic survey probe module and sampling
Resistive module；
The input that with pumping signal module occurs for the output end of microprocessor is connected, and the output end that module occurs for pumping signal is same
When be connected with the input of collection period control module and power amplifier module, the output end of collection period control module with it is micro-
The input of processor module is connected, and the output end of power amplifier module is connected with the input of magnetic survey probe module, and magnetic survey is visited
The output end of head module is connected with the input of Signal-regulated kinase and sampling resistor module simultaneously, sampling resistor module it is defeated
Go out end with the input of Signal-regulated kinase to be connected, the output end of Signal-regulated kinase and the input phase of analog-to-digital conversion module
Even, the output end of analog-to-digital conversion module is connected with the input of micro treatment module, magnetic survey probe module and tested ferrimagnet
It is brought into close contact.
It is preferred that, described magnetic survey probe module includes magnetic core, is provided with magnetic core and the tested ferrimagnet
The magnetic survey probe of laminating；Induction coil and excitation coil are wound with magnetic core, connection described power in excitation coil one end is put
Big module, the other end passes through described sampling resistor module ground；Induction coil one end is grounded, the described signal of other end connection
Conditioning module.
It is preferred that, described magnetic core includes left and right two vertical ends and is vertically fixed on two vertical end upper surfaces
One horizontal segment, the lower surface of two vertical ends forms described magnetic survey probe；Described induction coil is simultaneously wound left and right
In two vertical ends and horizontal segment；Excitation coil is respectively wound around in left and right two vertical ends of magnetic core.
It is preferred that, described induction coil winds and divided in the same direction in left and right two vertical ends and horizontal segment of magnetic core
Chan Rao not 65 circles；Described excitation coil is wound in the same direction in left and right two vertical ends of magnetic core and winding 60 is enclosed respectively.
It is preferred that, described sampling resistor module uses resistance for 2 Ω, and power is more than 100W resistance.
It is preferred that, described power amplifier module includes the power amplifier of four groups of different amplifications composed in parallel,
The input of four groups of power amplifiers is provided with 4-bit DIP switch, 4-bit DIP switch respectively with four groups of power amplifier phases
Correspondence.
It is preferred that, described Signal-regulated kinase includes signal amplification circuit, signal filter circuit and integrating circuit, magnetic survey
The output end of probe module and the output end of sampling resistor module are respectively through amplifying circuit and signal filter circuit and integration
Analog-to-digital conversion module is accessed after circuit.
One kind is based on coercitive ferrimagnet electromagnetic nondestructive detection system method, it is characterised in that：Including following step
Suddenly：
Step 1, identical with tested ferrimagnet material and in the absence of internal stress ferromagnetic material is chosen ferromagnetic as standard
Material；
Step 2, using standard ferromagnetic material as test material, the collection of electromagnetic parameter is carried out by electromagnetic parameter collecting flowchart,
And obtain the magnetic hysteresis loop of standard ferromagnetic material；
Step 3, standard ferromagnetic material is replaced with into tested ferrimagnet, repeats electromagnetic parameter collecting flowchart and obtain tested ferromagnetic
The magnetic hysteresis loop of property material；
Step 4, it is determined that the internal stress degree of tested ferrimagnet.
It is preferred that, the electromagnetic parameter collecting flowchart described in step 2 comprises the following steps：
Step 2-1, the test surfaces of two magnetic survey probes and standard ferromagnetic material in magnetic survey probe module are fitted, and in knot
It is filled between conjunction face using magnetic-conductive adhesive；
Step 2-2, amplifying power is selected by power amplifier module, then pumping signal is occurred mould by microprocessor module
Block produces pumping signal, and pumping signal is sent into magnetic survey probe module and collection period control module simultaneously；
Step 2-3, the two neighboring rising edge signal that microprocessor module is sent into according to collection period control module controls modulus
The beginning and end of modular converter collection, is obtained in the same period that Signal-regulated kinase is exported by analog-to-digital conversion module
The integral voltage signal of integrating circuit, the sampled voltage signal of sampling resistor module and standard ferromagnetic material are obtained after being energized
Induced signal voltage；
Step 2-4, microprocessor module is according to formula（1）The magnetic field intensity for obtaining standard ferromagnetic material is calculated,
（1）
Wherein：For the electricity value at sampling resistor module two ends；R 1 For the resistance value at sampling resistor module two ends；N 1 For excitation line
The number of turn of circle；L is the average length of tested magnetic circuit；
Step 2-5, microprocessor is according to formula（2）The magnetic induction intensity for obtaining standard ferromagnetic material is calculated,
（2）
Wherein：For the induced signal voltage in induction coil,N 2 For the number of turn of induction coil；SFor the sectional area of magnetic circuit, i.e.,
The area that magnetic survey probe is contacted with standard ferromagnetic material.
It is preferred that, the frequency range of the pumping signal described in step 2-3 is 20 ~ 100Hz, and amplitude is less than ± 3.3V；
The time response t of integrating circuit is more than or equal to 10 times of magnetic field excitation signal pulse width.
Compared with prior art, the present invention is had an advantageous effect in that：1st, coercitive ferromagnetism material is based on by this
Expect electromagnetic nondestructive detection system and detection method, internal stress situation that can be more precisely to ferrimagnet is detected
Circuit structure is more succinct simultaneously.
2nd, it is based at this in coercitive ferrimagnet electromagnetic nondestructive detection system, by setting collection period to control mould
Block, can collect integral voltage signal, sampling resistor voltage signal and the standard ferromagnetic material quilt agreed in the period
The induced signal voltage obtained after excitation, thus obtain it is coercitive to ferrimagnet detection it is more accurate, so as to contribute to
More accurate judgement is made to the internal stress of ferrimagnet.
3rd, by setting the different power amplifier of multigroup multiplication factor in power amplifier module, therefore can be according to feelings
Condition selects suitable multiplication factor, and application is wider.
4th, pumping signal is adjusted to low frequency signal, the skin that becomes of tested ferrimagnet during so as to effectively reduction detection
Effect.
5th, it will be filled, can obtained more preferably using magnetic-conductive adhesive by popping one's head in and being tested between ferrimagnet in magnetic survey
Magnetic conduction effect, improve detection precision.
Brief description of the drawings
Fig. 1 is based on coercitive ferrimagnet electromagnetic nondestructive detection system functional-block diagram.
Fig. 2 is based on coercitive ferrimagnet electromagnetic nondestructive detection system magnetic survey probe module structural representation.
Fig. 3 is based on coercitive ferrimagnet electromagnetic nondestructive detection system collection period control module circuit theory
Figure.
Fig. 4 is based on coercitive ferrimagnet electromagnetic nondestructive detection system collection period control module oscillogram.
Fig. 5 is magnetic induction intensity with change of magnetic field strength curve.
Wherein：1st, magnetic core 2, induction coil 3, excitation coil 4, tested ferrimagnet 5, sampling resistor.
Embodiment
Fig. 1 ~ 5 are highly preferred embodiment of the present invention, and 1 ~ 5 the present invention will be further described below in conjunction with the accompanying drawings.
As shown in figure 1, based on coercitive ferrimagnet electromagnetic nondestructive detection system, including host computer, microprocessor
Module, collection period control module, Signal-regulated kinase, power amplification mould occur for module, analog-to-digital conversion module, pumping signal
Block, magnetic survey probe module and sampling resistor module.
The output end of microprocessor module is connected with the input of host computer, and output end and the pumping signal of microprocessor are sent out
The input of raw module is connected, pumping signal occur the output end of module simultaneously with collection period control module and power amplification
The input of module is connected, and the output end of collection period control module is connected with the input of microprocessor module.Power amplification
The output end of module is connected with the input of magnetic survey probe module, and the output end of magnetic survey probe module is while and Signal-regulated kinase
It is connected with the input of sampling resistor module, the output end of sampling resistor module is connected with the input of Signal-regulated kinase, believes
Number output end of conditioning module is connected with the input of analog-to-digital conversion module, the output end and micro treatment module of analog-to-digital conversion module
Input be connected.
When needing to detect measured material, the probe of ferromagnetic probe module is fitted with the surface of measured material,
Then microprocessor module sends pumping signal, pumping signal feeding power amplifier module by controlling pumping signal to occur module
After interior progress signal amplification in feeding magnetic survey probe module, pumping signal is applied in measured material by magnetic survey probe, and
Pass through sampling resistor module ground simultaneously, i.e., the electric current flowed through from sampling resistor module is the electric current of pumping signal, excitation
The electric current of signal flows through the sampling resistor voltage signal that sampling resistor module is obtained after sampling resistor module.
The sensing that the pumping signal and measured material obtained by sampling resistor module is obtained after being encouraged through pumping signal
Signal is sent into Signal-regulated kinase, and is further fed into by Signal-regulated kinase in analog-to-digital conversion module simultaneously, and passes through
Cross after the signal that analog-to-digital conversion module sends into Signal-regulated kinase synchronizes collection and send into microprocessor module, microprocessor
Module again sends into signal in host computer, is carried out by host computer to pumping signal and by the induced signal that measured material is obtained
Judge.
As shown in Fig. 2 magnetic survey probe module includes magnetic core 1, magnetic core 1 includes left and right two vertical ends and is fixed on perpendicular
One horizontal segment of straight end upper surface, horizontal segment vertically forms reverse U-shaped shape, magnetic core 1 with the vertical end of left and right two simultaneously
The lower surface of two vertical ends is popped one's head in as magnetic survey and fitted simultaneously with the surface of tested ferrimagnet 4 simultaneously.The height of magnetic core 1
For 50mm, length is 70mm, and width is 20mm, so as to form area at magnetic survey probe for 4cm2Magnetic survey face, the two of magnetic core 1
Spacing between individual magnetic survey probe is 30mm.Between existing when the magnetic survey face and the contact surface of tested ferrimagnet 4 that magnetic survey is popped one's head in
During gap, gap is filled using magnetic-conductive adhesive.
Two groups of coils are wound with magnetic core 1：Induction coil 2（Adopt and be represented by dashed line in fig. 2）With excitation coil 3（
Adopted in Fig. 2 indicated by the solid line）, wherein induction coil 2 is successively in the left side vertical section of magnetic core 1, horizontal segment and right vertical section
On be wound, and the number of turns that induction coil 2 is wound in two vertical sections and horizontal segment is identical with direction, induction coil 2
Two ends one end ground connection, the other end is accessed in above-mentioned Signal-regulated kinase, by the induced signal in induction coil 2（In Fig. 2
Voltage signal U1）Signal-regulated kinase and analog-to-digital conversion module are sent into simultaneously.Excitation coil 3 is wrapped in the left side of magnetic core 1 successively
In vertical section and right vertical section, the winding number of turns is identical with direction.The one end of excitation coil 3 connects the defeated of above-mentioned power amplifier module
Go out end, the other end completes with one end of sampling resistor 5 to be connected after corresponding winding, the other end ground connection of sampling resistor 5, sampling
Voltage signal on resistance 5（Voltage signal U2 in Fig. 2）Signal-regulated kinase and analog-to-digital conversion module, sampling electricity are accessed simultaneously
Resistance 5 is above-mentioned sampling resistor module.
Excitation coil 3 uses a diameter of 0.8mm enamel-covered wire, and excitation coil 3 is twined respectively in two vertical sections of magnetic core 1
Around 60 circles.Induction coil 2 is using a diameter of 0.28mm enamel-covered wire, two vertical sections and horizontal segment of the induction coil 2 in magnetic core 1
Upper winding 65 respectively is enclosed, and sampling resistor 5 uses resistance for 2 Ω, and power is more than 100W resistance.
Above-mentioned microprocessor uses the STM32F407ZGT6 with 32 disposal abilities, microprocessor module with it is upper
The serial ports of machine, which is connected, realizes communication.
Pumping signal occurs module and realized by model AD9850 chip, and module occurs for pumping signal by microprocessor mould
Block carries out system configuration, and microprocessor module sends different control commands so that pumping signal occurs module and can produce different frequencies
The periodic signal of rate, amplitude, signal form has sine wave, triangular wave, square wave etc.；Frequency range in 20 ~ 100Hz, amplitude ±
Within 3.3V, pumping signal is adjusted to low frequency signal, the skin that becomes of tested ferrimagnet 4 during so as to effectively reduction detection
Effect.
Power amplifier module includes the power amplifier of four groups of different amplifications composed in parallel, using model
LM3886TF power amplifier is realized, the input of four groups of power amplifiers is provided with 4-bit DIP switch, four dial-ups
Switch is corresponding with four groups of power amplifiers respectively, and the regulation of different amplifying powers is realized by stirring toggle switch.
As shown in Fig. 3 ~ 4, collection period control module is constituted to zero electricity using model LM293 integrated operational amplifier
Comparator circuit is pressed, the output signal of module occurs for the positive input connection pumping signal of integrated operational amplifier, reversely defeated
Enter end ground connection, using pumping signal each cycle initially with terminating the rising edge of relatively each triggering with no-voltage, microprocessor
Beginning and end of the device module according to collection period control module rising signals along control collection period；When first time rising edge letter
Control analog-to-digital conversion module starts to gather signal after number arriving, and control analog-to-digital conversion module is closed after second rising edge signal arrives
Close collection.
Signal-regulated kinase includes what is produced in signal amplification circuit, signal filter circuit and integrating circuit, induction coil 2
The voltage division signal U2 of induced signal U1 and sampling resistor 5 respectively through amplifying circuit and signal filter circuit and integrating circuit it
After send into analog-to-digital conversion module.The time response of the integrating circuit of Signal-regulated kinase should meet t and be greater than magnetic equal to 10 times
Field excitation signal pulse width.
Concrete operation step is as follows：
Step 1, identical with the tested material of ferrimagnet 4 and in the absence of internal stress ferromagnetic material is chosen ferromagnetic as standard
Material；
Step 2, the collection of electromagnetic parameter is carried out using standard ferromagnetic material as test material, and obtains the magnetic of standard ferromagnetic material
Hysteresis loop；
Comprise the following steps that：
Step 2-1, the test surfaces of two magnetic survey probes and standard ferromagnetic material in magnetic core 1 are fitted, and faying face it
Between be filled using magnetic-conductive adhesive；
Step 2-2, selects suitable amplifying power by power amplifier module, then makes pumping signal by microprocessor module
Generation module produces pumping signal, and pumping signal is sent into magnetic survey probe module and collection period control module simultaneously；
Step 2-3, the two neighboring rising edge signal that microprocessor module is sent into according to collection period control module controls modulus
The beginning and end of modular converter collection, is obtained in the same period that Signal-regulated kinase is exported by analog-to-digital conversion module
The induced signal voltage that integral voltage signal, the voltage signal of sampling resistor 5 and standard ferromagnetic material are obtained after being energized；
Step 2-4, microprocessor module is according to formula（1）The magnetic field intensity for obtaining standard ferromagnetic material is calculated,
（1）
Wherein：For the electricity value at the two ends of sampling resistor 5；R 1 For the resistance value at the two ends of sampling resistor 5；N 1 For excitation coil 3
The number of turn；LTo be tested the average length of magnetic circuit.
Step 2-5, microprocessor is according to formula（2）The magnetic induction intensity for obtaining standard ferromagnetic material is calculated,
（2）
Wherein：For the induced signal voltage in induction coil 2,N 2 For the number of turn of induction coil 2；SFor the sectional area of magnetic circuit,
The area that i.e. magnetic survey probe is contacted with standard ferromagnetic material.
Step 3, repeat step 2 obtains the magnetic hysteresis loop of tested ferrimagnet 4；
As shown in figure 5, wherein solid line is the magnetic hysteresis loop of standard ferromagnetic material, dotted line is the magnetic hysteresis of tested ferrimagnet 4
Curve is returned, a points are the coercivity of standard ferromagnetic material, and b points are the coercivity of tested ferrimagnet 4.
Step 4, it is determined that the internal stress degree of tested ferrimagnet 4.
The above described is only a preferred embodiment of the present invention, being not the limitation for making other forms to the present invention, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Imitate embodiment.But it is every without departing from technical solution of the present invention content, the technical spirit according to the present invention is to above example institute
Any simple modification, equivalent variations and the remodeling made, still fall within the protection domain of technical solution of the present invention.
Claims (10)
1. based on coercitive ferrimagnet electromagnetic nondestructive detection system, including tested ferrimagnet（4）, its feature exists
In：It is provided with microprocessor module, analog-to-digital conversion module, pumping signal and occurs module, collection period control module, signal condition
Module, power amplifier module, magnetic survey probe module and sampling resistor module；
The input that with pumping signal module occurs for the output end of microprocessor is connected, and the output end that module occurs for pumping signal is same
When be connected with the input of collection period control module and power amplifier module, the output end of collection period control module with it is micro-
The input of processor module is connected, and the output end of power amplifier module is connected with the input of magnetic survey probe module, and magnetic survey is visited
The output end of head module is connected with the input of Signal-regulated kinase and sampling resistor module simultaneously, sampling resistor module it is defeated
Go out end with the input of Signal-regulated kinase to be connected, the output end of Signal-regulated kinase and the input phase of analog-to-digital conversion module
Even, the output end of analog-to-digital conversion module is connected with the input of micro treatment module, magnetic survey probe module and tested ferrimagnet
（4）It is brought into close contact.
2. according to claim 1 be based on coercitive ferrimagnet electromagnetic nondestructive detection system, it is characterised in that：Institute
The magnetic survey probe module stated includes magnetic core（1）, in magnetic core（1）On be provided with and the tested ferrimagnet（4）The magnetic of laminating
Probing head；In magnetic core（1）On be wound with induction coil（2）And excitation coil（3）, excitation coil（3）The described work(of one end connection
Rate amplification module, the other end passes through described sampling resistor module ground；Induction coil（2）One end is grounded, other end connection institute
The Signal-regulated kinase stated.
3. according to claim 2 be based on coercitive ferrimagnet electromagnetic nondestructive detection system, it is characterised in that：Institute
The magnetic core stated（1）Including left and right two vertical ends and it is vertically fixed on a horizontal segment of two vertical end upper surfaces, two
The lower surface of vertical end forms described magnetic survey probe；Described induction coil（2）It is simultaneously wound left and right two vertical ends with
And on horizontal segment；Excitation coil（3）It is respectively wound around magnetic core（1）Left and right two vertical ends on.
4. according to claim 3 be based on coercitive ferrimagnet electromagnetic nondestructive detection system, it is characterised in that：Institute
The induction coil stated（2）In magnetic core（1）Left and right two vertical ends and horizontal segment in the same direction wind and respectively winding 65 enclose；
Described excitation coil（3）In magnetic core（1）Left and right two vertical ends in the same direction wind and respectively winding 60 enclose.
5. according to claim 1 or 2 be based on coercitive ferrimagnet electromagnetic nondestructive detection system, its feature exists
In：Described sampling resistor module uses resistance for 2 Ω, and power is more than 100W resistance.
6. according to claim 1 be based on coercitive ferrimagnet electromagnetic nondestructive detection system, it is characterised in that：Institute
The power amplifier module stated includes four groups of power amplifiers of different amplification composed in parallel, in four groups of power amplifiers
Input is provided with 4-bit DIP switch, and 4-bit DIP switch is corresponding with four groups of power amplifiers respectively.
7. according to claim 1 be based on coercitive ferrimagnet electromagnetic nondestructive detection system, it is characterised in that：Institute
The Signal-regulated kinase stated includes signal amplification circuit, signal filter circuit and integrating circuit, the output end of magnetic survey probe module
And the output end of sampling resistor module after amplifying circuit and signal filter circuit and integrating circuit respectively through accessing modulus
Modular converter.
8. utilize being realized based on coercitive ferrimagnet electromagnetic nondestructive detection system described in any one of claim 1 ~ 7
Detection method, it is characterised in that：Comprise the following steps：
Step 1, choose and tested ferrimagnet（4）Material is identical and is used as standard iron in the absence of the ferromagnetic material of internal stress
Magnetic material；
Step 2, using standard ferromagnetic material as test material, the collection of electromagnetic parameter is carried out by electromagnetic parameter collecting flowchart,
And obtain the magnetic hysteresis loop of standard ferromagnetic material；
Step 3, standard ferromagnetic material is replaced with into tested ferrimagnet（4）, repeat electromagnetic parameter collecting flowchart and be tested
Ferrimagnet（4）Magnetic hysteresis loop；
Step 4, it is determined that tested ferrimagnet（4）Internal stress degree.
9. detection method according to claim 8, it is characterised in that：Electromagnetic parameter collecting flowchart described in step 2, bag
Include following steps：
Step 2-1, the test surfaces of two magnetic survey probes and standard ferromagnetic material in magnetic survey probe module are fitted, and in knot
It is filled between conjunction face using magnetic-conductive adhesive；
Step 2-2, amplifying power is selected by power amplifier module, then pumping signal is occurred mould by microprocessor module
Block produces pumping signal, and pumping signal is sent into magnetic survey probe module and collection period control module simultaneously；
Step 2-3, the two neighboring rising edge signal that microprocessor module is sent into according to collection period control module controls modulus
The beginning and end of modular converter collection, is obtained in the same period that Signal-regulated kinase is exported by analog-to-digital conversion module
The integral voltage signal of integrating circuit, the sampled voltage signal of sampling resistor module and standard ferromagnetic material are obtained after being energized
Induced signal voltage；
Step 2-4, microprocessor module is according to formula（1）The magnetic field intensity for obtaining standard ferromagnetic material is calculated,
（1）
Wherein：For the electricity value at sampling resistor module two ends；R 1 For the resistance value at sampling resistor module two ends；N 1 For excitation line
Circle（3）The number of turn；L is the average length of tested magnetic circuit；
Step 2-5, microprocessor is according to formula（2）The magnetic induction intensity for obtaining standard ferromagnetic material is calculated,
（2）
Wherein：For induction coil（2）In induced signal voltage,N 2 For induction coil（2）The number of turn；SFor the section of magnetic circuit
Product, i.e., the area that magnetic survey probe is contacted with standard ferromagnetic material.
10. detection method according to claim 9, it is characterised in that：The frequency model of pumping signal described in step 2-3
Enclose for 20 ~ 100Hz, amplitude is less than ± 3.3V；
The time response t of integrating circuit is more than or equal to 10 times of magnetic field excitation signal pulse width.
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| CN110823997A (en) * | 2019-10-29 | 2020-02-21 | 万向钱潮股份有限公司 | Nondestructive measurement device and method for core ferrite of shaft part |
| CN111257407A (en) * | 2020-03-08 | 2020-06-09 | 北京工业大学 | First-order reversal magnetization response matrix characterization method for ferromagnetic material performance |
| CN111257407B (en) * | 2020-03-08 | 2023-04-14 | 北京工业大学 | Method for representing first-order reversal magnetization response matrix of ferromagnetic material performance |
| CN113608154A (en) * | 2021-08-12 | 2021-11-05 | 北京航空航天大学 | In-situ magnetic permeability detection probe, equipment and detection method |
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