CN105547124B - Ohject displacement measurement apparatus and its measuring method in paramagnetic case based on magnetic mark - Google Patents
Ohject displacement measurement apparatus and its measuring method in paramagnetic case based on magnetic mark Download PDFInfo
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- CN105547124B CN105547124B CN201610029340.6A CN201610029340A CN105547124B CN 105547124 B CN105547124 B CN 105547124B CN 201610029340 A CN201610029340 A CN 201610029340A CN 105547124 B CN105547124 B CN 105547124B
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- magnetic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
Abstract
The invention discloses ohject displacement measurement apparatus in a kind of paramagnetic case based on magnetic mark, including between magnetic screen, planer-type measurement bay, magnetic mark, the first measuring system and the second measuring system, wherein：Planer-type measurement bay is arranged in magnetic screen, and the paramagnetic case for being loaded with testee is placed with it；Magnetic mark is fixed on the testee position nearest from paramagnetic case inner surface, and the direction that may be subjected to displacement along testee magnetizes；First measuring system places the changes of magnetic field after front and rear and testee is subjected to displacement for recording testee；Second measuring system carries out corresponding one-dimensional coordinate demarcation for the first measuring system while recording magnetic field changes.The present invention can possess higher detection depth and relatively low error to the displacement progress Non-Destructive Testing of object in paramagnetic metal or non-metal box, and lossless to material, have no any harm to health, therefore, it is suitable to popularization and application.
Description
Technical field
The present invention relates to field of non destructive testing, and in particular to be ohject displacement in a kind of paramagnetic case based on magnetic mark
Measurement apparatus and its measuring method.
Background technology
In field of non destructive testing, the detection of object is common application scenario in case, such as the product to casing encapsulation
Relative displacement, the detection of dislocation occur for interior parts, and particularly product can be caused when casing can not be taken apart or take apart easily
When damage, this Non-Destructive Testing is highly desirable.
At present, x-ray imaging or gamma-rays detection technique are typically used to the detection method of object in case, wherein, X ray
Imaging technique is commonly utilized in field of safety check and medical domain, and the former more pays close attention to the information such as the shape of object, structure, the latter in case
Human organ, the image and pathology of tissue are more paid close attention to, but X ray is weaker to the penetration capacity of metal cabinet, it is micro- to object in case
The measurement of thin tail sheep is even more rare.And gamma-rays is larger to human health damage, thus more it is used for material and detects a flaw, but it is strict next
Say, gamma-rays has micro- damage to material.In addition, although observational measurement ability of the gamma-rays to defect is stronger, equally it is difficult to
The micro-displacement of quantitative measurment object.
Therefore, it is necessary to provide a kind of deep to metal piercing ability, lossless and to object in the case of health non-hazardous
Displacement, the detection technique of dislocation.
The content of the invention
For above-mentioned the deficiencies in the prior art, the invention provides ohject displacement in a kind of paramagnetic case based on magnetic mark
Measurement apparatus and its measuring method, can in paramagnetic metal or non-metal box object displacement carry out Non-Destructive Testing, possess compared with
High detection depth and relatively low error.
To achieve the above object, the technical solution adopted by the present invention is as follows：
Ohject displacement measurement apparatus in paramagnetic case based on magnetic mark, including between magnetic screen, planer-type measurement bay, magnetic
Mark, the first measuring system and the second measuring system, wherein：
Planer-type measurement bay, it is arranged in magnetic screen, the paramagnetic case for being loaded with testee is placed with it；
Magnetic mark, the testee position nearest from paramagnetic case inner surface is fixed on, and may be sent out along testee
The direction magnetization of raw displacement；
First measuring system, directly over magnetic mark, and close to paramagnetic case outer surface, put for recording testee
Put the changes of magnetic field after front and rear and testee is subjected to displacement；
Second measuring system, while be connected with planer-type measurement bay and the first measuring system, exist for the first measuring system
Recording magnetic field carries out corresponding one-dimensional coordinate demarcation while change.
Preferably, the magnetic mark is NdFeB magnetic powder.
Specifically, first measuring system is included directly over magnetic mark and close to paramagnetic case outer surface
Flux-gate magnetometer is popped one's head in, the probe that one end is connected with the connection of flux-gate magnetometer probe, the other end with the second measuring system
Folder, and the flux-gate magnetometer digital display being connected by signal wire with the fluxgate magnetic strength head；The fluxgate magnetic strength
Count the pole orientation for being oriented parallel to magnetic mark of probe.
Specifically, second measuring system include being fixed in planer-type measurement bay and with measured object in paramagnetic case
The parallel grating scale of body moving direction, the displacement transducer for being slidably connected on the grating scale and being connected with the probe clip other end,
And the grating scale digital display being connected by signal wire with the displacement transducer.
Further, the probe clip length is 5cm~10cm.
Preferably, it is between double-deck permalloy magnetic screen between the magnetic screen.
Yet further, described grating scale, displacement transducer, probe clip and the respective outside of flux-gate magnetometer probe
It is enclosed with the magnetic masking layer made of paramagnetic material.
Structure based on said apparatus, present invention also offers the measuring method of the measurement apparatus, comprise the following steps：
(1) each point before testee is placed along grating scale range measurement paramagnetic case using flux-gate magnetometer probe
Magnetic field, magnetic field space distribution curve is then recorded and drawn out, and be designated as background magnetic field；
(2) it is each after placement testee along grating scale range measurement paramagnetic case to continue with flux-gate magnetometer probe
The magnetic field of point, then each subtracts the background magnetic field of same coordinate point in step (1), then draws out magnetic field space distribution curve,
Obtain the sample magnetic field before testee is subjected to displacement；
(3) curve drawn according to step (2), flux-gate magnetometer probe is moved to the maximum position of the slope of curve,
Then the coordinate value of the point and corresponding sample magnetic field are recorded；
(4) after testee is subjected to displacement, flux-gate magnetometer probe positions are constant, measure the magnetic field of point now,
Then the background magnetic field of same coordinate point is subtracted again, obtains the sample magnetic field of the point after displacement；
(5) according to the sample magnetic field obtained by step (4), corresponding coordinate value is found in the curve that step (2) is drawn,
Then the coordinate value is subtracted to the coordinate value of record in step (3), you can obtain the displacement of testee.
Compared with prior art, the invention has the advantages that：
(1) present invention by setting between magnetic screen, planer-type measurement bay, the first measuring system, the second measuring system and magnetic
Property mark, and paramagnetic case is placed on flux-gate magnetometer probe lower section, probe is as far as possible close with box outer surface, and testee can
What can be subjected to displacement is oriented parallel to grating scale.Consequently, it is possible to after testee is subjected to displacement, flux-gate magnetometer probe can
The change in magnetic field is measured, so as to which the displacement of object can be measured according to the space distribution rule and background magnetic field in magnetic magnetic field.This
Invention possesses simultaneously to the detectability of ohject displacement in paramagnetic metal case and non-metal box, and the present invention is using magnetostatic field suitable
The characteristics of penetration depth is big in magnetic material carries out displacement detecting, the shortcomings that X ray being overcome to be difficult to penetrate metal.
(2) detection depth of the present invention to object is very big, the results showed, it can reach about 50mm, because
Magnetostatic field will not produce vortex in paramagnetic material and cause to decay, and only exist negative cube of the magnetic dipole magnetic field with distance
Decay.
(3) displacement measurement accuracy of the invention is high, its using the milligauss of minimum measured value 0.01 flux-gate magnetometer and
30mm3NdFeB magnetic powder, when paramagnetic case thickness is 17mm, to the measurement error of the micro-displacement within 1mm up to 0.02mm,
And measurement of the x-ray imaging technology to ohject displacement in the paramagnetic metal case of condition of equivalent thickness at present is difficult to reach this precision.
(4) measuring method of the invention is not only lossless to material, and has no any harm to health, because
The present invention does not produce any ionising radiation during use, and the magnetic field size measured also only has milligauss magnitude, is
Very weak magnetic field, therefore on measured material and biology without influence.
(5) metering system of the present invention is flexible, measurement accuracy is high, detection depth is big, compensate for field of non destructive testing well
To object micro-displacement and the blank of dislocation measurement, therefore, the present invention has very high practical value and promotional value.
Brief description of the drawings
Fig. 1 is the structural representation of measurement apparatus of the present invention.
Fig. 2 is the enlarged diagram at A in Fig. 1.
Fig. 3 is the curve synoptic diagram of background magnetic field in the present invention.
Fig. 4 is to add the curve synoptic diagram that testee is subjected to displacement forward and backward sample magnetic field in Fig. 3.
Fig. 5 is the contrast schematic diagram of the testee shift value and measured value measured using the present invention.
Fig. 6 is the 0.2mm that the present invention measures to the micro-displacement value and the contrast schematic diagram of measured value between 1.6mm.
Wherein, it is entitled corresponding to reference：
Between 1- magnetic screens, 2- planer-type measurement bays, 3- grating scales, 4- displacement transducers, 5- probe clips, 6- fluxgate magnetic strength
Meter probe, 7- grating scale digital displays, 8- flux-gate magnetometer digital displays, 9- magnetic marks, 10- paramagnetic casees, 11- quilts
Survey object.
Embodiment
The invention will be further described with embodiment for explanation below in conjunction with the accompanying drawings, and mode of the invention includes but not only limited
In following examples.
As shown in Figure 1, 2, the invention provides a kind of displacement measuring device, in terms of can be applied to Non-Destructive Testing, the device
Including 1 between magnetic screen, planer-type measurement bay 2, magnetic mark 9, the first measuring system and the second measuring system.
1 using (such as double-deck 1.5mm permalloys magnetic screen between double-deck permalloy magnetic screen between described magnetic screen
Between), it can be by below earth magnetism field shield to 10 milligauss under the earth's magnetic field environment of 0.5 Gauss.Described planer-type measurement bay 2
It is arranged in 1 between magnetic screen, the paramagnetic case 10 for being loaded with testee 11 is placed with it.In the present embodiment, planer-type measurement
Frame 2 is built by 4040 aluminium section bars and aluminum connector, copper screw.
Described magnetic mark 9 is fixed on the testee position nearest from paramagnetic case inner surface, and along testee
The direction magnetization that may be subjected to displacement.In the present embodiment, the magnetic mark 9 is NdFeB magnetic powder, and it should be noted that paramagnetic
There can not be the magnetic field sources for being better than NdFeB magnetic powder in case 10, to avoid interference.
The magnetic field that first measuring system is used to record before and after testee 11 is placed and after testee displacement becomes
Change, it is included directly over magnetic mark 9 and close to the flux-gate magnetometer probe 6 of paramagnetic case outer surface, one end and the magnetic
The probe clip 5 of the connection of flux-gate magnetometer probe 6, and be connected by signal wire with flux-gate magnetometer probe 6 and be located at magnetic
Flux-gate magnetometer digital display 8 outside 1 between shielding；The flux-gate magnetometer probe 6 is oriented parallel to magnetic mark
The pole orientation of note 9.And the first described measuring system is then carried out for the first measuring system while recording magnetic field changes
Corresponding one-dimensional coordinate demarcation, it includes being fixed in planer-type measurement bay 2 and put down with testee moving direction in paramagnetic case
Capable grating scale 3, the displacement transducer 4 for being slidably connected on the grating scale 3 and being connected with the other end of probe clip 5, and pass through
Signal wire and the displacement transducer 4 connect and 1 between magnetic screen outside grating scale digital display 7.Flux-gate magnetometer
Probe 6 can be selected with grating scale 3 according to the measurement accuracy needed for user, displacement measurement errors and the measurement error of the two
Relevant, the measurement error of the two is smaller, and the measurement error of testee displacement is also smaller in paramagnetic case.
Also, in the present embodiment, the length of probe clip 5 is 5cm~10cm, so can effectively reduce the shadow of grating scale remanent magnetism
Ring；Meanwhile described grating scale 3, displacement transducer 4, probe clip 5 and 6 respective outsides of flux-gate magnetometer probe are wrapped up
There is the magnetic masking layer made of paramagnetic material, so can effectively avoid the magnetic of parts to the adverse effect of magnetic-field measurement.
The measurement process of the present invention is described in detail below.
(1) magnetic mark 9 is installed.By volume about 30mm3Magnetic mark (NdFeB magnetic powder) with being adhesive in testee
11 positions nearest from the inner surface of paramagnetic case 10, and magnetize along the direction that may be subjected to displacement.Then paramagnetic case 10 is placed on magnetic
The lower section of flux-gate magnetometer probe 6, flux-gate magnetometer probe 6 are as far as possible close with the outer surface of paramagnetic case 10.
(2) background magnetic field is measured.Flux-gate magnetometer probe 6 is moved along grating scale 3, is moved to about from coordinate 0mm
70mm, the magnetic-field component numerical value of recording flux flux gate magnetometer digital display 8, and curve is depicted as, as shown in Figure 3.
(3) the sample magnetic field before measurement testee 11 is subjected to displacement.Paramagnetic case 10 is placed on planer-type measurement bay 2,
Magnetic mark 9 is located at immediately below flux-gate magnetometer probe 6.Before testee 11 is subjected to displacement, by flux-gate magnetometer probe 6
Moved along grating scale 3, about 70mm, the magnetic-field component number of recording flux flux gate magnetometer digital display 8 are moved to from coordinate 0mm
Value, plots curve, subtracts the background magnetic field in Fig. 3, then plots curve, that is, obtains magnetic sample field (circle point curve in Fig. 4).And
Afterwards, it (can be the one of maximum slope flux-gate magnetometer probe 6 to be moved into the larger any point of magnetic sample curvature of field line slope
Point), write down the point coordinates and sample magnetic field, background magnetic field.
(4) the sample magnetic field after measurement testee 11 is subjected to displacement.6 positions of flux-gate magnetometer probe are constant, are tested
After object is subjected to displacement, measured magnetic field changes, and new magnetic field value subtracts the background magnetic field of the point, obtains the point after displacement
Sample magnetic field it is vertical, new value is found on Fig. 4 circle point curves corresponding to coordinate value, the position of the point is marked, in Fig. 4
Shown in triangle point.New coordinate value subtracts the point coordinates before being subjected to displacement, that is, the measured value being subjected to displacement.
(5) measurement of comparison value and measured value.Open casing, the displacement actually occurred with vernier caliper measurement, the two contrast
Curve is plotted, as shown in figure 5, with measuring method of the present invention, 0.2mm is to the micro-displacement between 1.6mm for measurement, with reality
The displacement that border occurs compares, and plots curve, as shown in Figure 6.And in fig. 5 and fig., thickness model of the casing at 17 to 47 millimeters
In enclosing, the linearity is higher between displacement measurement and actual value, and error is smaller, illustrate the present invention have detection depth greatly, displacement
The advantages of measurement error is small.
The present invention is designed by rational structure and measuring method, can be to the displacement of object in paramagnetic metal or non-metal box
Non-Destructive Testing is carried out, it, which detects depth, can reach about 50mm, and the micro-displacement within 1mm be detected, and error can be with
Reach 0.02mm precision, thus possess higher detection depth and relatively low error.Also, the present invention is not only to paramagnetism gold
Category, nonmetallic casing can detect, and lossless to material, have no to endanger to health.Therefore, the present invention fills out well
Mended prior art be difficult to object micro-displacement and dislocation carry out Non-Destructive Testing blank, its compared with prior art for, tool
There are prominent substantive distinguishing features and significant progress.
Above-described embodiment is only one of the preferred embodiment of the present invention, should not be taken to limit the protection model of the present invention
Enclose, all body design thought in the present invention and that mentally makes have no the change of essential meaning or polishing, what it was solved
Technical problem is still consistent with the present invention, should be included within protection scope of the present invention.
Claims (8)
1. ohject displacement measurement apparatus in the paramagnetic case based on magnetic mark, it is characterised in that including (1), gantry between magnetic screen
Formula measurement bay (2), magnetic mark (9), the first measuring system and the second measuring system, wherein：
Planer-type measurement bay, it is arranged in magnetic screen, the paramagnetic case for being loaded with testee is placed with it；
Magnetic mark, the testee position nearest from paramagnetic case inner surface is fixed on, and position may occur along testee
The direction magnetization of shifting；
First measuring system, directly over magnetic mark, and close to paramagnetic case outer surface, before recording testee placement
Afterwards and testee be subjected to displacement after changes of magnetic field；
Second measuring system, while be connected with planer-type measurement bay and the first measuring system, recorded for the first measuring system
Corresponding one-dimensional coordinate demarcation is carried out while changes of magnetic field.
2. ohject displacement measurement apparatus in the paramagnetic case according to claim 1 based on magnetic mark, it is characterised in that institute
It is NdFeB magnetic powder to state magnetic mark (9).
3. ohject displacement measurement apparatus in the paramagnetic case according to claim 1 or 2 based on magnetic mark, its feature exist
In first measuring system is included directly over magnetic mark (9) and close to the flux-gate magnetometer of paramagnetic case outer surface
Pop one's head in (6), one end and the flux-gate magnetometer probe probe clip (5) that (6) are connected, the other end is connected with the second measuring system,
And the flux-gate magnetometer digital display (8) being connected by signal wire with the fluxgate magnetic strength head (6)；The magnetic flux door sensor
The pole orientation for being oriented parallel to magnetic mark (9) of strong dose probe (6).
4. ohject displacement measurement apparatus in the paramagnetic case according to claim 3 based on magnetic mark, it is characterised in that institute
It is in planer-type measurement bay (2) and parallel with testee moving direction in paramagnetic case including being fixed on to state the second measuring system
Grating scale (3), the displacement transducer (4) for being slidably connected on the grating scale (3) and being connected with probe clip (5) other end, and
The grating scale digital display (7) being connected by signal wire with the displacement transducer (4).
5. ohject displacement measurement apparatus in the paramagnetic case according to claim 4 based on magnetic mark, it is characterised in that institute
It is 5cm~10cm to state probe clip (5) length.
6. ohject displacement measurement apparatus in the paramagnetic case according to claim 5 based on magnetic mark, it is characterised in that institute
(1) is between double-deck permalloy magnetic screen between stating magnetic screen.
7. ohject displacement measurement apparatus in the paramagnetic case according to claim 6 based on magnetic mark, described grating scale
(3), displacement transducer (4), probe clip (5) and flux-gate magnetometer probe (6) respective outside are enclosed with by paramagnetism material
Magnetic masking layer made of material.
8. the measuring method of the device described in a kind of claim 7, it is characterised in that comprise the following steps：
(1) magnetic of flux-gate magnetometer probe each point before placement testee along grating scale range measurement paramagnetic case is utilized
, magnetic field space distribution curve is then recorded and draws out, and be designated as background magnetic field；
(2) continue with flux-gate magnetometer probe and each point after testee is placed along grating scale range measurement paramagnetic case
Magnetic field, then each subtracts the background magnetic field of same coordinate point in step (1), then draws out magnetic field space distribution curve, obtains
Testee be subjected to displacement before sample magnetic field；
(3) curve drawn according to step (2), flux-gate magnetometer probe is moved to the maximum position of the slope of curve, then
Record the coordinate value of the point and corresponding sample magnetic field；
(4) after testee is subjected to displacement, flux-gate magnetometer probe positions are constant, measure the magnetic field of point now, then
The background magnetic field of same coordinate point is subtracted again, obtains the sample magnetic field of the point after displacement；
(5) according to the sample magnetic field obtained by step (4), corresponding coordinate value is found in the curve that step (2) is drawn, then
The coordinate value is subtracted to the coordinate value of record in step (3), you can obtain the displacement of testee.
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| CN105547124B true CN105547124B (en) | 2018-02-02 |
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| CN106154190B (en) * | 2016-06-21 | 2018-11-27 | 中国工程物理研究院材料研究所 | For the magnetic measuring device and its implementation of medium managese steel martensitic traoformation |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3346095A1 (en) * | 1982-12-22 | 1984-06-28 | VEB Feinmesszeugfabrik Suhl, DDR 6000 Suhl | Device for measuring displacements of a body without tilting error |
| CN201787917U (en) * | 2010-06-09 | 2011-04-06 | 李新华 | High-accuracy magnetic displacement transducer |
| CN102607391A (en) * | 2012-03-01 | 2012-07-25 | 清华大学 | Method for measuring displacement of planar motor rotor |
| CN103743823A (en) * | 2014-01-20 | 2014-04-23 | 厦门大学 | Electromagnetic ultrasonic probe with variable structure |
| CN204461338U (en) * | 2015-03-11 | 2015-07-08 | 武汉静磁栅机电制造有限公司 | Based on the high precision Linear displacement detection device of magnetic induction sensor |
-
2016
- 2016-01-15 CN CN201610029340.6A patent/CN105547124B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3346095A1 (en) * | 1982-12-22 | 1984-06-28 | VEB Feinmesszeugfabrik Suhl, DDR 6000 Suhl | Device for measuring displacements of a body without tilting error |
| CN201787917U (en) * | 2010-06-09 | 2011-04-06 | 李新华 | High-accuracy magnetic displacement transducer |
| CN102607391A (en) * | 2012-03-01 | 2012-07-25 | 清华大学 | Method for measuring displacement of planar motor rotor |
| CN103743823A (en) * | 2014-01-20 | 2014-04-23 | 厦门大学 | Electromagnetic ultrasonic probe with variable structure |
| CN204461338U (en) * | 2015-03-11 | 2015-07-08 | 武汉静磁栅机电制造有限公司 | Based on the high precision Linear displacement detection device of magnetic induction sensor |
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