CN108195927A - Nonferromugnetic material impurity non-destructive testing sensor based on magnetic susceptibility measurement principle - Google Patents
Nonferromugnetic material impurity non-destructive testing sensor based on magnetic susceptibility measurement principle Download PDFInfo
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- CN108195927A CN108195927A CN201711407797.7A CN201711407797A CN108195927A CN 108195927 A CN108195927 A CN 108195927A CN 201711407797 A CN201711407797 A CN 201711407797A CN 108195927 A CN108195927 A CN 108195927A
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- permanent magnet
- cantilever beam
- hall element
- impurity
- destructive testing
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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
-
- 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
The invention discloses the nonferromugnetic material impurity non-destructive testing sensors based on magnetic susceptibility measurement principle, mainly include cantilever beam, adjust permanent magnet, be fixed on the perception permanent magnet of cantilever beam end, be installed on the Hall element of beam-ends, wherein perceiving the magnetostatic field that permanent magnet provides vertical nonferromugnetic material surface to be measured；Crossbeam where Hall element is mutually fixed with cantilever beam pedestal, and Hall element measures the magnetic field intensity above permanent magnet.Adjustment permanent magnet, adjustment cantilever beam to level are installed on the upside of crossbeam.Nonferromagnetic material is different from internal impurity susceptibility, they are inconsistent with the amount of force for perceiving permanent magnet, and cantilever beam deflection is caused to change；The change of cantilever beam deflection will cause the changes of magnetic field of Hall element position, and then hall element output voltage is caused to change.The sensor that the present invention announces particular for the non-destructive testing of impurity in nonferromagnetic material, and can judge paramagnetic, the diamagnetic or ferromagnetic characteristic of impurity according to testing result.
Description
Technical field
The invention discloses a kind of nonferromugnetic material impurity non-destructive testing sensors based on magnetic susceptibility measurement principle, belong to
In the magnetics field of non destructive testing of material damage.
Background technology
Material non-destructive testing judges the characteristic of material using the various physicochemical properties of material defects inspecting is material
Expect the important content of non-destructive testing.It, can be to having the impurity of different magnetic characteristics to carry out in material based on magnetic susceptibility measurement principle
Non-destructive testing.
The magnetic characteristic of material is classified according to the value range of material susceptibility, is broadly divided into ferromagnetic material, paramagnetic material
Material and diamagnetic material three classes.The magnetic susceptibility measurement method of common used material is magnetic balance method, and principle is：Material is in uniform gradient magnetic
By magneticaction in, the magnetic force being subject in uniform gradient magnetic field using the material of precision balance measurement designated volume, then
According to formulaMaterial susceptibility is calculated, this method is mainly applicable in the sample of material of specific shape or solution sample
This, reason is that the exciting field that the field element of magnetic balance generates only is uniform graded in a certain range, because
This this method can not evaluate block materials local susceptibility.Another measuring instrument of magnetic susceptibility is vibrating example magnetic strength
Meter, suitable for the sample of material of micro volume.The above method can not directly apply to block materials and carry out impurity non-destructive testing.
The present invention is directed to the non-destructive testing problem of block materials impurity, based on magnetic susceptibility measurement principle, discloses a kind of base
In the novel sensor of cantilever beam structure, the hall element output voltage signal reflection for being installed on beam-ends can be utilized tested
Active force between material and its internal impurity and cantilever beam tail end permanent magnet body.Present invention is generally directed to the inspections of nonferromagnetic block materials
It surveys, it can be according to magneto sensor output voltage signal mutation analysis impurity position and magnetic characteristic.
Invention content
The present invention is based on magnetic susceptibility measurement principles to propose a kind of novel sensing for nonferromagnetic material impurity non-destructive testing
Device.The measuring principle of sensor is that nonferromugnetic material has different magnetic susceptibility from internal impurity, they are with perceiving permanent magnet
Amount of force it is inconsistent, the amount of deflection of cantilever beam end is caused to change；The change of cantilever beam deflection will cause Hall element institute
The changes of magnetic field at position, and then the output voltage of Hall element is caused to change.Non-ferric based on magnetic susceptibility measurement principle
Magnetic material impurity non-destructive testing sensor mainly include cantilever beam, be fixed on cantilever beam end perception permanent magnet, be installed on
Adjustment permanent magnet on crossbeam, the Hall element for being installed on beam-ends.Wherein, permanent magnet is perceived to be installed under cantilever beam
Side provides the static magnetic field on vertical ferrimagnet surface to be measured；Crossbeam where Hall element is mutually fixed with cantilever beam pedestal,
Hall element is fixed on beam-ends, for measuring the magnetic field intensity above permanent magnet.Adjustment permanent magnetism is installed on the upside of crossbeam
Body for adsorbing the perception permanent magnet of cantilever beam end, offsets the dead weight for perceiving permanent magnet, adjustment cantilever beam to level.With magnetic
Balance measurement material susceptibility method is different, is fixed using measured material, perceives the mode of permanent magnet stress, realizes material
The measurement of surface local susceptibility, and can be by changing cantilever beam and being fixed on the ruler for perceiving permanent magnet of cantilever beam end
The very little sensitivity for improving detection spatial resolution or sensor；Cantilever beam has as mgnetic observations element relative to magnetic balance
There is dynamometry high sensitivity, small, strong antijamming capability, move；Linear hall element is a kind of General Magnetic field inspection
Element is surveyed, there is the advantages of linearity is good, and stability is strong；Using Hall element measure changes of magnetic field, can accurately reflect due to
Cantilever beam tip displacement caused by magnetic force change.Therefore, the size changed by the output signal of Hall element can be surveyed accurately
The variation of material susceptibility is measured, so as to fulfill the different defects inspecting of magnetic susceptibility in nonferromagnetic material, hall element output signal
Variation may determine that the presence or absence of impurity, the polarity of variation may determine that the magnetism of material (paramagnetic, diamagnetic).In conclusion base
In magnetic susceptibility measurement principle nonferromugnetic material impurity non-destructive testing sensor be suitable for nonferromagnetic block materials impurity without
Damage detection, and can determine the magnetism of impurity.
Description of the drawings
Fig. 1 is the nonferromugnetic material impurity non-destructive testing sensor detection principle diagram based on magnetic susceptibility measurement principle
Fig. 2 is the nonferromugnetic material impurity non-destructive testing sensor graphics based on magnetic susceptibility measurement principle
Fig. 3 is the nonferromugnetic material impurity non-destructive testing sensor vertical view based on magnetic susceptibility measurement principle
Fig. 4 is work of the nonferromugnetic material impurity non-destructive testing sensor on scanning support based on magnetic susceptibility measurement principle
Make schematic diagram
Fig. 5 is peace of the nonferromugnetic material impurity non-destructive testing sensor on scanning support based on magnetic susceptibility measurement principle
Fill schematic diagram
Fig. 6 be nonferromugnetic material impurity non-destructive testing sensor based on magnetic susceptibility measurement principle distinguish sweep air,
Paramagnetic material, diamagnetic material, air scanning result figure
Fig. 7 is that the nonferromugnetic material impurity non-destructive testing sensor based on magnetic susceptibility measurement principle detects faint diamagnetic material
The typical testing result figure of paramagnetic impurities in the material diamagnetic impurity different with magnetic susceptibility
Specific embodiment
Fig. 1 shows that the detection of the nonferromugnetic material impurity non-destructive testing sensor based on magnetic susceptibility measurement principle is former
Reason, the perception permanent magnet 9 are fixed on 1 end of cantilever beam, and with test specimen 18 by magnetic interaction, test specimen 18 is interior, and there are two kinds
The paramagnetic impurities 25 different from 18 magnetic susceptibility of test specimen and diamagnetic impurity 26, when perceiving permanent magnet by paramagnetic impurities 25 or diamagnetic miscellaneous
It during matter 26, perceives permanent magnet 16 and paramagnetic impurities 25 and either generates between diamagnetic impurity 26 and attract or repulsive force, with perceiving forever
16 mutually fixed cantilever beam 1 of magnet generates downward or upward deflection deformation, so as to change Hall element 13 with perceiving forever
Relative position between magnet 16 causes the magnetic field at Hall element 13 to change, and Hall element 13 detects changes of magnetic field
And output voltage signal, the polarity and size that are changed by 13 voltage signal of Hall element can detect magnetism and the position of impurity
The information such as put.Adjustment permanent magnet 9 is fixed on crossbeam 4, for interacting with perceiving permanent magnet 16, to eliminate by perception permanent magnetism
1 deflection deformation of cantilever beam caused by body 16 is conducted oneself with dignity.
Fig. 2 shows the graphics of the nonferromugnetic material impurity non-destructive testing sensor based on magnetic susceptibility measurement principle,
Wherein cantilever beam 1 is fixed together with crossbeam 4 by setting-up piece 3, bolt 2, nut 5, cantilever beam 1 between two panels gasket 3,
Between nut and gasket, crossbeam 4 is connect crossbeam 4 with bracket base 7, Hall sensor stent 15 using slideway structure, makes it
It can be slided along 4 length direction of crossbeam, the purpose is to allow Hall element position with adjustment permanent magnetism body position with cantilever beam
Size changes and changes, and to adapt to different detection demands, adjustment permanent magnet 9 is fixed on permanent magnetism body support frame 8, bracket base 7
On have the half-arc groove do not closed, for installing permanent magnetism body support frame 8, allow permanent magnetism body support frame 8 around its axis rotation, permanent magnet
The elongated shaft at 8 both ends of stent is used with bracket base 7 and is interference fitted, due to magnetic between adjustment permanent magnet 9 and perception permanent magnet 16
Power effect is very faint, therefore interference fit can ensure 8 angle of permanent magnetism body support frame after fixing not because magneticaction rotates.
Fixing nut 6 for fixed adjustment permanent magnet pedestal 7 horizontal position, Hall sensor 13 by Hall sensor stent 15 with
Crossbeam connects, and printed circuit board (PCB) 12 simplifies the circuit connection of Hall element, and is fixed on Hall with connection bolt 11 and passes
On sensor bracket 15, the power supply of Hall element 13 and output signal are transferred by the miniature adapters 10 of SMB.Adjust permanent magnet
Bracket base 7 and Hall sensor stent 15 slide to 4 middle part of crossbeam by crossbeam front end, and end socket 14 seals the notch of crossbeam 4, increases
The stability of sensor perceives permanent magnet 16 and is fixed on 1 downside of cantilever beam, and the residual magnetization and size for perceiving permanent magnet can bases
Detection demand is set, while the size of cantilever beam 1 also occurs accordingly to change.
Fig. 4 shows the nonferromugnetic material impurity non-destructive testing sensor based on magnetic susceptibility measurement principle on scanning support
Operating diagram, sensor 21 is fixed on scanning support 20, in the height apart from 18 surface vertical range 0.5mm to 2mm of test specimen
Horizontal direction scanning experiment is carried out at degree, to avoid test error, cushion block 17 is non-magnetic material, and magnetic susceptibility parameter should be remote small
In test specimen, dry timber or plastics etc. can be used.
Fig. 5 shows nonferromugnetic material impurity non-destructive testing sensor based on magnetic susceptibility measurement principle and scanning support
Fixed relationship, U-shaped fixed block 22 have the sliding slot to match with 21 crossbeam of sensor for fixing 21 crossbeam of sensor, and U-shaped is fixed
Block 22 is fixed with fixing bracket 19 by fixing screws 23, and four adjusting screws 24 can be used for adjustment 21 crossbeam of sensor to water
It is flat.
Fig. 6 shows that sensor 21 detects the scanning result figure for passing through air, paramagnetic test specimen, diamagnetic test specimen, air successively,
The aerial detection voltage of setting sensor is reference voltage 0, hall output voltage during 21 swept paramagnetic material of sensor
It reduces, Hall sensor output voltage raising during swept diamagnetic material.
Fig. 7 shows that the nonferromugnetic material impurity non-destructive testing sensor detection based on magnetic susceptibility measurement principle is faint anti-
The typical testing result figure of paramagnetic impurities in the magnetic material diamagnetic impurity different with magnetic susceptibility, when there are paramagnetics in diamagnetic material
During impurity, the output voltage values of sensor can decline rapidly, when, there are during paramagnetic impurities, the output of sensor is electric in diamagnetic material
Pressure value can rise rapidly, in actually detected, sensor can surface of test piece carry out C-scan experiment, and to testing result into
Row imaging, can the position of impurity and magnetic characteristic in accurate judgement test specimen.
Claims (2)
1. the nonferromugnetic material impurity non-destructive testing sensor based on magnetic susceptibility measurement principle, it is characterised in that：Including cantilever
Beam, the perception permanent magnet for being fixed on cantilever beam end and the Hall element for being installed on beam-ends, the crossbeam where Hall element
It is mutually fixed with cantilever beam pedestal, to measure the magnetic field intensity above permanent magnet；Adjustment permanent magnet on the upside of crossbeam is installed, is used for
Adsorb the perception permanent magnet of cantilever beam end, adjustment cantilever beam to level；The downside that permanent magnet is installed on cantilever beam is wherein perceived,
The static magnetic field on vertical ferrimagnet surface to be measured is provided, when the magnetic susceptibility for perceiving detected materials below permanent magnet changes,
The interaction force for perceiving permanent magnet and detected materials changes, and cantilever beam end is caused to generate displacement, and then cause Hall element
It changes with the electromagnetic field at perceiving the relative distance variation namely Hall element of permanent magnet.
2. according to the nonferromugnetic material impurity non-destructive testing sensor described in claim 1 based on magnetic susceptibility measurement principle,
It is characterized in that：
Paramagnetic or ferromagnetism detected materials or impurity provide adsorption to perceiving permanent magnet, lead to cantilever beam end to court
Detected materials or contaminant surface direction generate displacement, and the output voltage of Hall element reduces；Diamagnetic detected materials or impurity, to sense
Know that permanent magnet provides repulsion force, cantilever beam end is caused to generate displacement to far from detected materials or contaminant surface direction, suddenly
The output voltage increase of your element.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711407797.7A CN108195927A (en) | 2017-12-22 | 2017-12-22 | Nonferromugnetic material impurity non-destructive testing sensor based on magnetic susceptibility measurement principle |
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| CN201711407797.7A CN108195927A (en) | 2017-12-22 | 2017-12-22 | Nonferromugnetic material impurity non-destructive testing sensor based on magnetic susceptibility measurement principle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858462A (en) * | 2021-04-12 | 2021-05-28 | 浙江捷安工程有限公司 | Rapid nondestructive testing method applied to standard reaching of carbon content of steel bar in concrete member |
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| JP2001033429A (en) * | 1999-07-23 | 2001-02-09 | Shimizu Corp | Damage diagnostic method for metal member |
| CN101512700A (en) * | 2006-09-06 | 2009-08-19 | 本田技研工业株式会社 | Position sensor and vehicle seat position sensor |
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| CN103499636A (en) * | 2013-10-11 | 2014-01-08 | 中国科学院大学 | Method for nondestructively testing micro-defects in sheet ferromagnetic materials based on measurement of magnetostatic force |
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Non-Patent Citations (1)
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|---|---|---|---|---|
| CN112858462A (en) * | 2021-04-12 | 2021-05-28 | 浙江捷安工程有限公司 | Rapid nondestructive testing method applied to standard reaching of carbon content of steel bar in concrete member |
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Application publication date: 20180622 |