CN109187732A - A kind of barkhausen signal detection probe and measurement method with lift off measurement - Google Patents
A kind of barkhausen signal detection probe and measurement method with lift off measurement Download PDFInfo
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- CN109187732A CN109187732A CN201811059874.9A CN201811059874A CN109187732A CN 109187732 A CN109187732 A CN 109187732A CN 201811059874 A CN201811059874 A CN 201811059874A CN 109187732 A CN109187732 A CN 109187732A
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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
- G01N27/725—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables by using magneto-acoustical effects or the Barkhausen effect
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Abstract
The invention discloses a kind of barkhausen signal detection probe and measurement method with lift off measurement, detection probe is wound in U-shaped magnetic yoke by excitation coil and constitutes magnetizing exciter；Lift-off detection coil is made of the PCB coil on flexible circuit board, and lift-off detection coil is located on two feet of U-shaped magnetic yoke；Barkhausen signal detection coil is the air core coil as made of enameled wire coiling, is located at the centre of U-shaped magnetic yoke, and the barkhausen signal of detection is finally saved and handled by PC by amplification, high-pass filtering, A/D sampling.Lift-off detection method uses the LC parallel resonance of lift-off detection coil and resonant capacitance, is based on eddy current effect, by measuring equivalent parallel impedance RpVariation with inductance L measures lift off.Due to overcoming Lift-off effect, the barkhausen signal accuracy of detection coil measurement is higher.
Description
Technical field
The present invention relates to a kind of barkhausen signal detection probes and measurement method with lift off measurement, integrate simultaneously
Barkhausen signal detection and lift off measurement, the detection for ferrimagnet stress and mechanical performance.
Background technique
Ferrimagnet is as manufacturing and the important materials of engineering, for ferrimagnet stress and mechanical performance
It detects most important.Traditional detection technique mainly has X-ray diffraction method, Metallographic Analysis etc., but in the detection process can be right
Material cause wear or destroy, and there are operating difficulties, measurement accuracy is low the problems such as, limit its application in engineering.
Magnetic Barkhausen noise detection method is answered in research and engineering as a kind of new lossless detection method
With.Magnetic Barkhausen noise signal reflects the irreversible change and motion conditions of magnetic domain inside ferrimagnet.Due to magnetic domain
The variation and movement of structure are closely related with the microstructure and stress state of material, it is possible to be used for material internal and answer
The detection and evaluation of power and mechanical performance.
Since barkhausen signal is influenced by Lift-off effect, that is, the electromagnetic field effect changed is on ferrimagnet, material
Interior generation magnetic barkhausen signal size can change at a distance from conductor with variation electromagnetic field and be changed.So for lift-off away from
From being detected, the precision of barkhausen signal detection can be effectively improved, to more accurately detect material internal stress
And mechanical performance.
The lift off of Barkhausen's detection probe needs very high detection accuracy in millimeter to a centimetre rank.Currently,
It using the detecting distance method of ultrasonic wave or infrared distance measurement, is affected by bad border, such as dirt, dust etc., and exists and survey
The problems such as accuracy of measurement is low, there are measurement blind areas.
The present invention proposes a kind of barkhausen signal detection probe and measurement method with lift off measurement, realizes inspection
The lift off of measuring probe while surveying barkhausen signal, not (the remote ultra-traditional distance detection in the micron-scale of the precision of measurement
Method), the influence that can be effectively compensated for or overcome lift off to barkhausen signal.Compared to traditional single Barkhausen
Detection probe can accurately measure barkhausen signal.
Summary of the invention
Goal of the invention: the purpose of the present invention is design it is a kind of with lift off measurement barkhausen signal detection probe and
Measurement method can overcome influence of the lift off to barkhausen signal compared to single barkhausen signal detection probe,
Have the advantages that measurement is accurate, easy to operate.
Technical solution: a kind of barkhausen signal detection probe with lift off measurement, including U-shaped magnetic yoke, excitation line
Circle, lift-off detection coil and barkhausen signal detection coil；It is wound in U-shaped magnetic yoke by excitation coil and constitutes magnetizing exciter；It mentions
It from detection coil is made of the PCB coil on flexible circuit board, lift-off detection coil is located on two feet of U-shaped magnetic yoke；Bar
Ke Haosen signal detection coil is the air core coil as made of enameled wire coiling, is located at the centre of U-shaped magnetic yoke, the Bark person of outstanding talent of detection
Gloomy signal is finally saved and is handled by PC by amplification, high-pass filtering, A/D sampling.
The lift-off detection coil is made of the PCB coil on flexible circuit board, and two feet of U-shaped magnetic yoke are placed on
On；Or be made of the coil of enameled wire coiling, it is placed on two foot sides of U-shaped magnetic yoke.
A kind of measurement method of the barkhausen signal detection probe with lift off measurement, using lift-off detection coil and
Capacitor LC parallel resonance is based on eddy current effect, by measuring equivalent parallel impedance RpVariation with inductance L come measure lift-off away from
From.Due to overcoming Lift-off effect, the barkhausen signal accuracy of measurement is higher.It is as follows to measure lift off process:
Step 1:[frequency sweep] Direct Digital Synthesizer (DDS chip) is used, the sine wave of variable frequency is exported, is made
It obtains LC antiresonant circuit and is constantly in resonant state；
Step 2:[frequency measurement] by timer measurement resonance frequency, so that inductance value L be calculated indirectly；
Step 3:[survey impedance] measurement inductance capacitance LC resonance circuit impedance；
Step 4:[data are fitted] since equivalent parallel impedance, inductance and lift off are not stringent linear relationship, institute
With the nonlinear fitting of data to be carried out, then the different ferrimagnets detected to needs establish model library.
The utility model has the advantages that compared with prior art, the barkhausen signal detection provided by the invention with lift off measurement
Probe and measurement method, have the advantages that
1. the integrated barkhausen signal detection of probe and lift off measurement.
2. influence of the lift-off to barkhausen signal can be overcome by the detection of lift off.
3. being based on eddy current effect, the detection of lift off is not influenced by grease, dust.
4. the measurement accuracy of lift off is other in the micron-scale.
5. carrying out Database Modeling for the plate needed, the lift off and Bark of all ferrimagnets can detecte
The gloomy signal of person of outstanding talent.
Detailed description of the invention
Fig. 1 is the barkhausen signal detection probe schematic device with lift off measurement；
Fig. 2 is the another way figure of lift-off measuring coil installation；
Fig. 3 is lift off measurement model schematic diagram.
Specific embodiment
Combined with specific embodiments below, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate the present invention
Rather than limit the scope of the invention, after the present invention has been read, those skilled in the art are to various equivalences of the invention
The modification of form falls within the application range as defined in the appended claims.
The detection probe of the detection of a kind of while integrated barkhausen signal and lift off measurement that the present invention designs, device
Schematic diagram is as shown in Figure 1.It is wound in U-shaped magnetic yoke by excitation coil and constitutes magnetizing exciter, can produce the magnetic field of alternation.Lift-off inspection
Test coil is made of the PCB coil on flexible circuit board (FPC), and FPC coil can be made very thin, can be placed in U-shaped magnetic
On two feet of yoke.Detection coil is the air core coil as made of enameled wire coiling, is placed on the centre of U-shaped magnetic yoke, bar of detection
Ke Haosen signal is finally saved and is handled by PC by amplification, high-pass filtering, A/D sampling.If lift-off detection coil is
The coil of enameled wire coiling can be placed on magnetic yoke side, as shown in Figure 2.
The present invention is based on eddy current effects to measure lift off.When being connected with alternating current in coil, meeting around coil
An alternating magnetic field is generated, the conductor being placed in magnetic field can generate current vortex, and current vortex can generate a new magnetic field, and direction
With former magnetic field on the contrary, so part original magnetic field can be offset, the effective impedance of hot-wire coil and inductance value is made to change.So surveying
Lift off is measured, measurement effective impedance and inductance value can be passed through.
Since ferrimagnet will affect former electromagnetic field near inductance capacitance LC parallel resonance, the variation of eddy-current loss can
To be equivalent to equivalent parallel resonant impedance Rp, the variation of winding inductance quantity L can be equivalent to the variation of resonance frequency.
The present invention is it is discovered by experiment that equivalent parallel resonant impedance RpSuitable for measuring apart from big situation, inductance L is suitable
For measuring apart from lesser situation, since lift off is generally all in millimeter to Centimeter Level, it is possible to be combined with inductance L
Equivalent parallel resonant impedance RpIt measures.Equivalent parallel resonant impedance RpMore sensitive to temperature, inductance L is relatively stable, institute
With when distance fitting, the weight of inductance can be higher than equivalent parallel resonant impedance.
The connection method of integrated lift-off detection circuit and lift-off detection coil is as shown in figure 3, lift-off detection line in probe
Parallel resonance capacitor C on circle, single-chip microcontroller/DSP control DDS chip drives LC resonance circuit by detection frequency, impedance, measure
The step of lift off, is as follows:
Step 1:[frequency sweep] using single-chip microcontroller/DSP control Direct Digital Synthesizer (DDS chip), output is variable
The sine wave of frequency, so that LC antiresonant circuit is constantly in resonant state.Single-chip microcontroller/DSP acquisition lift-off detection coil
Voltage illustrates that LC is in resonant state when voltage maximum, and single-chip microcontroller/DSP control DDS exports the frequency sine at this time
Wave.
Step 2:[frequency measurement] by the resonance frequency in single-chip microcontroller/DSP timer measurement lift-off detection coil, thus
It connects and inductance value L is calculated, as shown in formula (1).
Wherein, f is the resonance frequency of lift-off detection coil, and C is the capacitance of resonant capacitance, and π is pi.
Step 3:[survey impedance] measurement inductance capacitance LC resonance circuit impedance.It is adopted by the electric current being connected in the circuit LC
Current signal is converted into voltage signal by sample resistance and operational amplifier, is believed with single-chip microcontroller/DSP sampling sampling resistor voltage
Number, accurate current value is obtained, by the voltage V and electric current I in LC resonance circuit, the equivalent impedance of LC resonance circuit is calculated
Rp, as shown in formula (2).
Step 4:[data are fitted] since equivalent parallel impedance, inductance L and lift off are not stringent linear relationship, institute
With the nonlinear fitting of data to be carried out, then the different ferrimagnets detected to needs establish model library.
Claims (6)
1. a kind of barkhausen signal detection probe with lift off measurement, it is characterised in that: including U-shaped magnetic yoke, excitation line
Circle, lift-off detection coil and barkhausen signal detection coil；It is wound in U-shaped magnetic yoke by excitation coil and constitutes magnetizing exciter；It mentions
It from detection coil is made of the PCB coil on flexible circuit board, lift-off detection coil is located on two feet of U-shaped magnetic yoke；Bar
Ke Haosen signal detection coil is the air core coil as made of enameled wire coiling, is located at the centre of U-shaped magnetic yoke, the Bark person of outstanding talent of detection
Gloomy signal is finally saved and is handled by PC by amplification, high-pass filtering, A/D sampling.
2. the barkhausen signal detection probe as described in claim 1 with lift off measurement, it is characterised in that: by lift-off
Detection coil, which is made of the PCB coil on flexible circuit board and is changed to lift-off detection coil, then will by the coil of enameled wire coiling
Lift-off detection coil is located on two foot sides of U-shaped magnetic yoke.
3. the barkhausen signal detection probe as described in claim 1 with lift off measurement, it is characterised in that: in probe
The connection type of integrated lift-off detection circuit and lift-off detection coil are as follows: parallel resonance capacitor C, monolithic in lift-off detection coil
Machine/DSP controls DDS chip drives LC resonance circuit by detecting resonance frequency, the impedance of lift-off detection coil.
4. a kind of measurement method of the barkhausen signal detection probe with lift off measurement, which is characterized in that measurement lift-off
It is as follows apart from process:
Step 1: using Direct Digital Synthesizer, the sine wave of variable frequency is exported, so that LC antiresonant circuit one
Directly it is in resonant state；
Step 2: resonance frequency being measured by timer, so that inductance value L be calculated indirectly；
Step 3: the impedance of measurement inductance capacitance LC resonance circuit；
Step 4: since equivalent parallel impedance, inductance and lift off are not stringent linear relationships, so to carry out data
Nonlinear fitting, then the different ferrimagnets detected to needs establish model library.
5. the measurement method of the barkhausen signal detection probe as claimed in claim 4 with lift off measurement, feature
It is, inductance value L in step 2, as shown in formula (1):
Wherein, f is the resonance frequency of lift-off detection coil, and C is the capacitance of resonant capacitance, and π is pi.
6. the measurement method of the barkhausen signal detection probe as claimed in claim 3 with lift off measurement, feature
It is, current signal is converted by voltage signal by current sampling resistor and operational amplifier in step 3, with single-chip microcontroller/DSP
Sampled voltage signal obtains accurate current value, and by the voltage V and electric current I in circuit, the equivalent of LC resonance circuit is calculated
Impedance Rp, as shown in formula (2):
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811059874.9A CN109187732A (en) | 2018-09-12 | 2018-09-12 | A kind of barkhausen signal detection probe and measurement method with lift off measurement |
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| CN201811059874.9A CN109187732A (en) | 2018-09-12 | 2018-09-12 | A kind of barkhausen signal detection probe and measurement method with lift off measurement |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111595493A (en) * | 2020-06-29 | 2020-08-28 | 沈阳仪表科学研究院有限公司 | Pipeline stress detection probe and method based on magnetostrictive inverse effect |
| CN112406318A (en) * | 2020-11-24 | 2021-02-26 | 武汉先同科技有限公司 | Ink quantity detection device and method based on inductance technology and ink-jet printer |
| CN114112736A (en) * | 2020-08-28 | 2022-03-01 | 宝山钢铁股份有限公司 | Online measuring device and method for determining fracture elongation of low-carbon steel cold-rolled sheet |
| CN114509499A (en) * | 2022-01-27 | 2022-05-17 | 南昌航空大学 | Focusing semicircular probe for eddy current defect detection of metal component and use method thereof |
| CN116558675A (en) * | 2023-05-09 | 2023-08-08 | 南昌航空大学 | Alternating electromagnetic field stress detection signal processing method and device considering lift-off effect |
| CN117309130A (en) * | 2023-08-25 | 2023-12-29 | 深圳拓竹科技有限公司 | Method for measuring natural frequency of sliding block, 3D printing system and electronic equipment |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111595493A (en) * | 2020-06-29 | 2020-08-28 | 沈阳仪表科学研究院有限公司 | Pipeline stress detection probe and method based on magnetostrictive inverse effect |
| CN114112736A (en) * | 2020-08-28 | 2022-03-01 | 宝山钢铁股份有限公司 | Online measuring device and method for determining fracture elongation of low-carbon steel cold-rolled sheet |
| CN114112736B (en) * | 2020-08-28 | 2023-11-14 | 宝山钢铁股份有限公司 | Online measuring device and method for determining fracture elongation of low-carbon steel cold-rolled sheet |
| CN112406318A (en) * | 2020-11-24 | 2021-02-26 | 武汉先同科技有限公司 | Ink quantity detection device and method based on inductance technology and ink-jet printer |
| CN114509499A (en) * | 2022-01-27 | 2022-05-17 | 南昌航空大学 | Focusing semicircular probe for eddy current defect detection of metal component and use method thereof |
| CN116558675A (en) * | 2023-05-09 | 2023-08-08 | 南昌航空大学 | Alternating electromagnetic field stress detection signal processing method and device considering lift-off effect |
| CN116558675B (en) * | 2023-05-09 | 2024-01-30 | 南昌航空大学 | Alternating electromagnetic field stress detection signal processing method and device considering lift-off effect |
| CN117309130A (en) * | 2023-08-25 | 2023-12-29 | 深圳拓竹科技有限公司 | Method for measuring natural frequency of sliding block, 3D printing system and electronic equipment |
| CN117309130B (en) * | 2023-08-25 | 2024-10-11 | 深圳拓竹科技有限公司 | Method for measuring natural frequency of sliding block, 3D printing system and electronic equipment |
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Application publication date: 20190111 |