CN107576425A - A kind of device and method of non-contact measurement ferromagnetic material stress - Google Patents
A kind of device and method of non-contact measurement ferromagnetic material stress Download PDFInfo
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- CN107576425A CN107576425A CN201710740610.9A CN201710740610A CN107576425A CN 107576425 A CN107576425 A CN 107576425A CN 201710740610 A CN201710740610 A CN 201710740610A CN 107576425 A CN107576425 A CN 107576425A
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- ferromagnetic material
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Abstract
The present invention provides a kind of device and method of non-contact measurement ferromagnetic material stress, belongs to detection technique field.The device includes excitation coil, magnetic core, GMR, D.C. regulated power supply and data acquisition device, wherein, D.C. regulated power supply can be replaced successfully rate amplifier and function signal generator, and now data acquisition device is connected with phase-sensitive detection circuit.This method is by being passed through current induced magnetic field into excitation coil, tested ferromagnetic material is set to be in System for Low DC Magnetic Field off field, the change of the magnetic induction intensity as caused by changing magnetic conductivity around ferromagnetic material under GMR detection stress, stress information is obtained by the one-to-one relationship between GMR output and stress.What is be passed through to excitation coil can be DC current or alternating current, and GMR exports the voltage signal related to being tested ferromagnetic material stress；The system sensitivity height, small volume, ferromagnetic material stress non-contact measurement can be realized.
Description
Technical field
The present invention relates to detection technique field, device and the side of a kind of non-contact measurement ferromagnetic material stress are particularly related to
Method.
Background technology
The conventional measuring method of measurement ferromagnetic material (such as Strip, large-scale truss, spherical tank) internal stress is magnetic at present
Survey method, there are magnetic barkhausen method, magnetosonic shooting method, counter magnetostriction effect method, stress to cause Magnetic anisotropy method etc., its
In, counter magnetostriction effect method application is wider.Counter magnetostriction effect, also known as piezomagnetism or magnetoelastic effect, refer to be in
The ferrimagnet of System for Low DC Magnetic Field off field in the presence of external force (pulling force, pressure, moment of torsion etc.), its intensity of magnetization (i.e. magnetic conductivity,
Magnetic resistance) phenomenon that will change therewith.Magnetoelastic effect method survey the currently used measurement thinking of stress be using U-shaped, E types and
Multipole magnetic core, in center magnetic core around excitation coil, other magnetic cores around induction coil or two magnetic cores around excitation coil, two magnetic cores
Around induction coil, excitation coil is passed through the alternating current of a certain size and frequency, the iron of the alternate weak magnetic certain in amplitude off field
Magnetic material magnetic conductivity under outer stress changes and then causes magnetic induction intensity to change, and detects to become using induction coil
The signal of change, by the corresponding relation between ferromagnetic material stress and induction coil signal, it can must be tested stress suffered by ferromagnetic material.
This method can realize contact and the non-cpntact measurement of Ferromagnetic Material stress.But in order to improve the line of induction
The output characteristics of circle, AC excitation field excitation ferromagnetic material can only be used；Thus because the Kelvin effect of AC magnetic field makes the party
The stress mornitoring depth of method is limited；Simultaneously because the resolution ratio of induction coil is low, cause the stress mornitoring sensitivity of this method compared with
It is low.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of device and method of non-contact measurement ferromagnetic material stress,
Stress detection depth is improved, while more delicately measures the stress in ferromagnetic material in a non contact fashion.The present invention is using directly
Current circuit excitation ferromagnetic material produces magnetic field, straight using giant magnetoresistance (GMR-giant magnetoresistance) sensor
The change of detection ferromagnetic material D.C. magnetic field magnetic induction intensity is connect, therefore the detection sensitivity of stress can be significantly improved, is increased
The detection depth of internal stress, expand the application of magnetic survey strain method.
Apparatus of the present invention include excitation coil, magnetic core and GMR, and excitation coil is wrapped on magnetic core, are tested ferromagnetic
Material is relative with magnetic core, and GMR is between magnetic core and tested ferromagnetic material；The device also include D.C. regulated power supply and
Data acquisition device, D.C. regulated power supply output connect excitation coil, and GMR gathers signal output to data acquisition device.
Wherein, the input direct-current electric current into excitation coil.
The method measured using apparatus of the present invention, it is specially：The input direct-current electric current into excitation coil, DC voltage-stabilizing
Power supply output DC current makes tested ferromagnetic material magnetization, and D.C. regulated power supply provides Constant Direct Current weak magnetic for tested ferromagnetic material
, adjust the size in continuous current excitation magnetic field by adjusting D.C. regulated power supply output current size；GMR pickup is in
The signal intensity of tested ferromagnetic material under direct current low-intensity magnetic field under elastic stress effect, and GMR output and stress it
Between be in one-to-one relation.
When the input AC electric current into excitation coil, alternating current passes through function signal generator, function signal first
For generator output current to power amplifier, power amplifier provides electric current input stimulus coil to friendship for tested ferromagnetic material
Become low frequency low-intensity magnetic field；GMR detects the Dynamic Signal change under different stress, first through phase-sensitive detection circuit by carrier wave
Signal demodulation, filtering, then by data acquisition device gathered data.
The present apparatus adjusts continuous current excitation field by adjusting D.C. regulated power supply output current size；Believed by adjustment function
Number generator output waveform, frequency size, current amplitude adjust ac-excited field.GMR change in detection signal, can be with
The signal intensity under ac-excited magnetic fields is detected, the signal intensity under continuous current excitation magnetic fields can also be detected.
The above-mentioned technical proposal of the present invention has the beneficial effect that：
In such scheme, compared with existing magnetic survey technical scheme, its outstanding feature is to be used as signal by the use of DC excitation field
Excitation, changed with GMR to detect magnetic field signal.Ferromagnetic material excitation is actuated to by the use of DC excitation field as signal
When, its stress mornitoring depth is deeper, while the direct current signal post processing circuitry exported is simpler；And using GMR come
Detection direct current magnetic survey signal intensity is compared with using induction coil to detect AC magnetic field change, and the former detection sensitivity is more
Height, volume is smaller, can significantly reduce the volume of test device, and improve its sensitivity.
Brief description of the drawings
Fig. 1 is the apparatus structure schematic diagram of the non-contact measurement ferromagnetic material stress of the present invention；
Fig. 2 is the measurement device theory diagram of the non-contact measurement ferromagnetic material stress of the present invention；
Fig. 3 is the principle that the device of the non-contact measurement ferromagnetic material stress of the present invention is measured with continuous current excitation field
Sketch；
Fig. 4 is the principle sketch measured with direct current bilateral exciting field being extended according to measuring principle of the present invention.
Wherein：1- excitation coils；2- magnetic cores；3- is tested ferromagnetic material；4-GMR sensors；5- D.C. regulated power supplies；6- numbers
According to harvester.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
The present invention provides a kind of device and method of non-contact measurement ferromagnetic material stress.
As shown in figure 1, excitation coil 1 is wrapped on magnetic core 2 in the device, it is tested ferromagnetic material 3 and magnetic core 2 is relative, GMR
Sensor 4 is between magnetic core 2 and tested ferromagnetic material 3；Measuring principle is as shown in Figure 2.
Embodiment 1
It is a kind of using one group of Drive assembly and one group of sensor cluster homonymy (one side) arrangement, device as shown in Figure 3, selection
GMR 4 of the range of linearity between -3.0mT~3.0mT, the number of turn of excitation coil 1 are 450 circles, and it is thick to be tested ferromagnetic material 3
Degree is respectively 1.0mm, 2.0mm, 3.0mm, and the regulation output current of D.C. regulated power supply 5 is 200mA, and GMR 4 detects difference
Stationary singnal change under stress, then by the gathered data of data acquisition device 6, above-described embodiment is used to measure relatively thin iron
Thickness mean stress in magnetic material a direction.
Embodiment 2
When carrying out online stress measurement to light sheet with Fig. 3 shown devices, strip vibrates the change that can cause magnetic gap, magnetic gap
Change is very big on sensor output influence, in order to which magnetic gap caused by the vibration of compensating plate band changes the influence to output, using two groups
Drive assembly and two sensors component Bilateral Symmetry arrangement, device as shown in Figure 4, select a kind of range of linearity -3.0mT~
GMR 4 between 3.0mT, the number of turn of excitation coil 1 are 450 circles, the tested thickness of ferromagnetic material 3 be respectively 1.0mm,
2.0mm, 3.0mm, the regulation output current of D.C. regulated power supply 5 is 200mA, and GMR 4 detects sheet material under same stress
Stationary singnal change during vibration, then by the gathered data of data acquisition device 6.Stress is certain and two magnetic cores and two sensorses
Distance is certain, and two sensorses output sum can be approximately certain certain value when sheet material vibrates, and above-described embodiment is used to realize online survey
Measure the backlash compensation during thickness mean stress in relatively thin ferromagnetic material a direction.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (3)
- A kind of 1. device of non-contact measurement ferromagnetic material stress, it is characterised in that：Including excitation coil (1), magnetic core (2) and GMR (4), excitation coil (1) are wrapped on magnetic core (2), are tested ferromagnetic material (3) and magnetic core (2) relatively, GMR sensings Device (4) is located between magnetic core (2) and tested ferromagnetic material (3)；The device also includes D.C. regulated power supply (5) and data acquisition fills Put (6), D.C. regulated power supply (5) output connects excitation coil (1), and GMR (4) gathers signal output to data acquisition device (6)。
- 2. the device of non-contact measurement ferromagnetic material stress according to claim 1, it is characterised in that：The excitation line Enclose (1) input direct-current electric current.
- 3. the method measured using the non-contact measurement ferromagnetic material stress device described in claim 1, its feature are existed In：When the input direct-current electric current into excitation coil (1), D.C. regulated power supply (5) output DC current makes tested ferromagnetic material (3) magnetize, D.C. regulated power supply (5) is that tested ferromagnetic material (3) provides Constant Direct Current low-intensity magnetic field；At GMR (4) pickup Signal intensity of the tested ferromagnetic material (3) under elastic stress effect under direct current low-intensity magnetic field, and GMR (4) exports It is in one-to-one relation between stress.
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| CN201710740610.9A CN107576425A (en) | 2017-08-25 | 2017-08-25 | A kind of device and method of non-contact measurement ferromagnetic material stress |
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| CN201710740610.9A CN107576425A (en) | 2017-08-25 | 2017-08-25 | A kind of device and method of non-contact measurement ferromagnetic material stress |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111060241A (en) * | 2019-12-02 | 2020-04-24 | 天津大学 | Torque detection system and method based on magnetic Barkhausen effect |
| CN111208457A (en) * | 2019-12-18 | 2020-05-29 | 清华大学 | Novel magnetostriction measurement method and device |
| CN112067173A (en) * | 2020-09-29 | 2020-12-11 | 刘翡琼 | Spiral pressure detector |
| CN112327224A (en) * | 2020-11-02 | 2021-02-05 | 国网江苏省电力有限公司电力科学研究院 | Non-closed magnetic circuit magnetic field induction electricity taking testing device and method |
| CN113405648A (en) * | 2021-06-23 | 2021-09-17 | 常州工学院 | Variable stress type vibration sensor |
| CN116593035A (en) * | 2023-04-11 | 2023-08-15 | 杭州健而控科技有限公司 | Split type electromagnetic spring type absolute stress monitoring device without on-site winding |
| CN116839780A (en) * | 2023-07-06 | 2023-10-03 | 西安电子科技大学 | Weak electromagnetic force measuring device and method for wireless power transmission coupler |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111060241A (en) * | 2019-12-02 | 2020-04-24 | 天津大学 | Torque detection system and method based on magnetic Barkhausen effect |
| CN111208457A (en) * | 2019-12-18 | 2020-05-29 | 清华大学 | Novel magnetostriction measurement method and device |
| CN111208457B (en) * | 2019-12-18 | 2021-05-18 | 大连理工大学 | Novel magnetostriction measurement method and device |
| CN112067173A (en) * | 2020-09-29 | 2020-12-11 | 刘翡琼 | Spiral pressure detector |
| CN112327224A (en) * | 2020-11-02 | 2021-02-05 | 国网江苏省电力有限公司电力科学研究院 | Non-closed magnetic circuit magnetic field induction electricity taking testing device and method |
| CN112327224B (en) * | 2020-11-02 | 2024-02-13 | 国网江苏省电力有限公司电力科学研究院 | Non-closed magnetic circuit magnetic field induction electricity acquisition testing device and method |
| CN113405648A (en) * | 2021-06-23 | 2021-09-17 | 常州工学院 | Variable stress type vibration sensor |
| CN113405648B (en) * | 2021-06-23 | 2024-01-23 | 常州工学院 | Variable stress type vibration sensor |
| CN116593035A (en) * | 2023-04-11 | 2023-08-15 | 杭州健而控科技有限公司 | Split type electromagnetic spring type absolute stress monitoring device without on-site winding |
| CN116839780A (en) * | 2023-07-06 | 2023-10-03 | 西安电子科技大学 | Weak electromagnetic force measuring device and method for wireless power transmission coupler |
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