CN107907040A - A kind of displacement sensing method and device based on AC magnetism bridge loop - Google Patents
A kind of displacement sensing method and device based on AC magnetism bridge loop Download PDFInfo
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- CN107907040A CN107907040A CN201711178752.7A CN201711178752A CN107907040A CN 107907040 A CN107907040 A CN 107907040A CN 201711178752 A CN201711178752 A CN 201711178752A CN 107907040 A CN107907040 A CN 107907040A
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- magnetic core
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- measuring probe
- amplifier
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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
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention belongs to technical field of nondestructive testing, and a kind of displacement sensing method and device based on AC magnetism bridge loop are disclosed, this method comprises the following steps：1) measuring probe is directed at metal covering to be measured；2) loaded respectively to every group of excitation coil ac-excited, then multigroup excitation coil produces the opposite alternating current magnetic field in direction in the transverse part of magnetic core；3) magnetic flux in receiving coil measurement magnetic core, obtains the peak-to-peak value of alternating voltage；4) shift value of metal covering to be measured is obtained into correspondence reciprocal according to the peak-to-peak value of the shift value of metal covering to be measured and alternating voltage；The device includes ac-excited source, measuring probe, amplifier, wave filter, A/D capture cards and computer, and measuring probe is electrically connected with ac-excited source and amplifier respectively, and amplifier is also sequentially connected wave filter, A/D capture cards and computer；The device of the invention is simple in structure, and anti-interference is good, low to determinand surface roughness requirements, and data processing is simple, efficient.
Description
Technical field
The invention belongs to technical field of nondestructive testing, is passed more particularly, to a kind of displacement based on AC magnetism bridge loop
Sensing method and device.
Background technology
Displacement measurement is widely applied in the industry.But many sensor face measurement planes can obtain higher precision,
When measuring curved surface salient point displacement, rocking for workpiece will produce measurement error.For example, coiled tubing ovality and straightness,
In the measurement such as rail straight line degree and profile, just it is difficult to carry out using conventional eddy displacement sensor.
The content of the invention
For the disadvantages described above or Improvement requirement of the prior art, the present invention provides a kind of position based on AC magnetism bridge loop
Method for sensing and device are moved, its is simple in structure, and anti-interference is good.
To achieve the above object, a kind of one side according to the invention, there is provided displacement based on AC magnetism bridge loop
Method for sensing, it is characterised in that comprise the following steps：
1) measuring probe of AC magnetism bridge loop is directed at metal covering to be measured, wherein, the measuring probe includes magnetic core, connects
Take-up circle and multigroup excitation coil, the magnetic core is integrally H-shaped, it includes two vertical parts and connects the transverse part of this two vertical part, each
The upper and lower ends of the vertical part install excitation coil described in one group respectively, and the receiving coil is installed in the middle part of the transverse part；
2) loaded respectively to excitation coil described in every group ac-excited, then multigroup excitation coil produces in the transverse part of magnetic core
The opposite alternating current magnetic field in direction；
3) magnetic flux in receiving coil measurement magnetic core, obtains the peak-to-peak value of alternating voltage；
4) gold to be measured is obtained into correspondence reciprocal according to the peak-to-peak value of the shift value of metal covering to be measured and alternating voltage
The shift value in category face.
Preferably, it is described ac-excited for the excitation of sinusoidal or cosine currents.
Other side according to the invention, additionally provides a kind of displacement sensing apparatus based on AC magnetism bridge loop, its
It is characterized in that, the displacement sensing apparatus includes ac-excited source, measuring probe, amplifier, wave filter, A/D capture cards and meter
Calculation machine, the measuring probe include magnetic core, receiving coil and multigroup excitation coil, and the magnetic core is integrally H-shaped, and it is perpendicular that it includes two
Portion and the transverse part for connecting this two vertical part, the upper and lower ends of each vertical part install excitation coil described in one group, the horizontal stroke respectively
The receiving coil is installed in the middle part of portion, the ac-excited source is electrically connected with excitation coil described in every group respectively, the amplification
Device is electrically connected with the receiving coil, for amplify voltage signal, and the amplifier be also sequentially connected the wave filter,
A/D capture cards and computer；
The ac-excited source to excitation coil described in every group by loading ac-excited, the generation side in the transverse part of magnetic core
To opposite magnetic field, the magnetic flux in magnetic core is measured by receiving coil, the voltage of receiving coil output amplifies by amplifier
It is transmitted to computer after filtered device filtering, the progress signal conversion of A/D capture cards again afterwards to be handled, so as to obtain gold to be measured
The shift value in category face.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it can obtain down and show
Beneficial effect：
1) measuring device of the invention is simple in structure, and anti-interference is good, low to determinand surface roughness requirements.
2) measuring device output is reciprocal linear with shift value in the present invention, and data processing is simple, efficient.
Brief description of the drawings
Fig. 1 is measuring probe structure and magnetic field schematic diagram in the present invention；
Fig. 2 is measurement data Linear Fit Chart in the present invention；
Schematic diagram when Fig. 3 is displacement sensing apparatus progress displacement detecting in the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Not forming conflict each other can be mutually combined.
With reference to Fig. 1~Fig. 3, a kind of displacement sensing method based on AC magnetism bridge loop, comprises the following steps：
1) measuring probe 2 of AC magnetism bridge loop is directed at metal covering 7 to be measured, wherein, the measuring probe 2 includes magnetic core
21st, receiving coil 22 and multigroup excitation coil 23, the magnetic core 21 is overall H-shaped, it includes two vertical parts and connects this two vertical part
Transverse part, the upper and lower ends of each vertical part install excitation coil 23 described in one group, institute are installed in the middle part of the transverse part respectively
State receiving coil 22；
2) ac-excited, then transverse part of multigroup excitation coil 23 in magnetic core 21 is loaded respectively to excitation coil 23 described in every group
It is middle to produce the opposite alternating current magnetic field in direction；
3) receiving coil 22 measures the magnetic flux in magnetic core 21, obtains the peak-to-peak value of alternating voltage；
4) gold to be measured is obtained into correspondence reciprocal according to the peak-to-peak value of the shift value of metal covering 7 to be measured and alternating voltage
The shift value in category face 7, due to there are reciprocal relation, then according to the value of two points be can obtain the shift value of metal covering 7 to be measured with
Whole curve of the peak-to-peak value correspondence of alternating voltage.
Further, it is described ac-excited for the excitation of sinusoidal or cosine currents.
Further, the peak-to-peak value V of alternating voltage and the relation of shift value are as follows：
In formula, V is 22 voltage signal peak-to-peak value of receiving coil, and N represents 23 number of turn of single group excitation coil, and I represents excitation electricity
Stream, R air reluctances between two excitation coils 23 (two excitation coils 23 of upper end) of the corresponding end of two vertical parts, μ is sky
The magnetic conductivity of gas, S are the sectional area of 21 bridge arm of magnetic core, and l is shift value to be measured.In formula, after the structure determination of measuring probe 2,
Only V and l is variable.
Other side according to the invention, additionally provides a kind of displacement sensing apparatus based on AC magnetism bridge loop, institute
Stating displacement sensing apparatus includes ac-excited source 1, measuring probe 2, amplifier 3, wave filter 4, A/D capture cards 5 and computer 6,
The measuring probe 2 includes magnetic core 21, receiving coil 22 and multigroup excitation coil 23, and the magnetic core 21 is overall H-shaped, it includes
Two vertical parts and the transverse part for connecting this two vertical part, the upper and lower ends of each vertical part install excitation coil 23 described in one group respectively,
The receiving coil 22 is installed in the middle part of the transverse part, the ac-excited source 1 is electrically connected with excitation coil 23 described in every group respectively
Connect, the amplifier 3 is electrically connected with the receiving coil 22, and for amplifying voltage signal, and the amplifier 3 is also successively
Connect the wave filter 4, A/D capture cards 5 and computer 6；
The ac-excited source 1 is ac-excited by being loaded to excitation coil 23 described in every group, in the transverse part of magnetic core 21
The opposite magnetic field in direction is produced, the magnetic flux in magnetic core 21 is measured by receiving coil 22, the voltage warp that receiving coil 22 exports
Cross amplifier 3 amplify after again filtered device 4 filter, A/D capture cards 5 carry out signal conversion after be transmitted at computer 6
Reason, so as to obtain the shift value of metal covering 7 to be measured.
The linear fit of one group of measurement data is shown by Fig. 2 as a result, its goodness of fit R2=0.9996, illustrate described
Correspondence for receiving coil 22 obtain signal peak crest voltage and shift value it is reciprocal in a linear relationship.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., should all include
Within protection scope of the present invention.
Claims (3)
1. a kind of displacement sensing method based on AC magnetism bridge loop, it is characterised in that comprise the following steps：
1) measuring probe of AC magnetism bridge loop is directed at metal covering to be measured, wherein, the measuring probe includes magnetic core, receives line
Circle and multigroup excitation coil, the magnetic core is integrally H-shaped, it includes two vertical parts and connects the transverse part of this two vertical part, each described
The upper and lower ends of vertical part install excitation coil described in one group respectively, and the receiving coil is installed in the middle part of the transverse part；
2) loaded respectively to excitation coil described in every group ac-excited, then multigroup excitation coil produces direction in the transverse part of magnetic core
Opposite alternating current magnetic field；
3) magnetic flux in receiving coil measurement magnetic core, obtains the peak-to-peak value of alternating voltage；
4) metal covering to be measured is obtained into correspondence reciprocal according to the peak-to-peak value of the shift value of metal covering to be measured and alternating voltage
Shift value.
2. a kind of displacement sensing method based on AC magnetism bridge loop according to claim 1, it is characterised in that described
It is ac-excited to be encouraged for sinusoidal or cosine currents.
3. a kind of displacement sensing apparatus based on AC magnetism bridge loop, it is characterised in that the displacement sensing apparatus includes exchange
Driving source, measuring probe, amplifier, wave filter, A/D capture cards and computer, the measuring probe include magnetic core, receiving coil
And multigroup excitation coil, the magnetic core is integrally H-shaped, it includes two vertical parts and connects the transverse part of this two vertical part, each described perpendicular
The upper and lower ends in portion install excitation coil described in one group respectively, and the receiving coil, the exchange are installed in the middle part of the transverse part
Driving source is electrically connected with excitation coil described in every group respectively, and the amplifier is electrically connected with the receiving coil, for amplification
Voltage signal, and the amplifier is also sequentially connected the wave filter, A/D capture cards and computer；The ac-excited source
It is ac-excited by being loaded to excitation coil described in every group, the opposite magnetic field in direction is produced in the transverse part of magnetic core, passes through reception
Magnetic flux in coil measurement magnetic core, the voltage of receiving coil the output filtering of filtered device, A/D again after amplifier amplifies
Computer is transmitted to after capture card progress signal conversion to be handled, so as to obtain the shift value of metal covering to be measured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711178752.7A CN107907040B (en) | 2017-11-23 | 2017-11-23 | A kind of displacement sensing method and device based on AC magnetism bridge loop |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711178752.7A CN107907040B (en) | 2017-11-23 | 2017-11-23 | A kind of displacement sensing method and device based on AC magnetism bridge loop |
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| CN107907040A true CN107907040A (en) | 2018-04-13 |
| CN107907040B CN107907040B (en) | 2019-04-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI657228B (en) * | 2018-05-03 | 2019-04-21 | 馳達科技股份有限公司 | Linear displacement sensing device |
| CN112161560A (en) * | 2020-10-26 | 2021-01-01 | 长江水利委员会长江科学院 | Displacement sensing device and method based on permanent magnet flux measurement |
| EP3888792A1 (en) * | 2020-03-30 | 2021-10-06 | Safran Aero Boosters SA | Module for attracting and detecting debris |
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| CN101281168A (en) * | 2008-03-13 | 2008-10-08 | 林俊明 | Method for changing energize mode to realize different mode electromagnetic detection |
| JP2009156680A (en) * | 2007-12-26 | 2009-07-16 | Shimadzu Corp | Displacement meter, elongation meter and material testing machine |
| CN102175131A (en) * | 2011-02-14 | 2011-09-07 | 厦门大学 | Method for measuring steel plate thickness by leakage magnetic field |
| CN102679858A (en) * | 2012-05-16 | 2012-09-19 | 浙江师范大学 | Dynamic micron-level passive micro-displacement sensor |
| CN104101292A (en) * | 2013-04-10 | 2014-10-15 | 泰科电子Amp有限责任公司 | Contactless position sensor and contactless position sensor system |
| CN104748661A (en) * | 2015-04-17 | 2015-07-01 | 兰州理工大学 | Differential transformer type displacement sensor |
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- 2017-11-23 CN CN201711178752.7A patent/CN107907040B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009156680A (en) * | 2007-12-26 | 2009-07-16 | Shimadzu Corp | Displacement meter, elongation meter and material testing machine |
| CN101281168A (en) * | 2008-03-13 | 2008-10-08 | 林俊明 | Method for changing energize mode to realize different mode electromagnetic detection |
| CN102175131A (en) * | 2011-02-14 | 2011-09-07 | 厦门大学 | Method for measuring steel plate thickness by leakage magnetic field |
| CN102679858A (en) * | 2012-05-16 | 2012-09-19 | 浙江师范大学 | Dynamic micron-level passive micro-displacement sensor |
| CN104101292A (en) * | 2013-04-10 | 2014-10-15 | 泰科电子Amp有限责任公司 | Contactless position sensor and contactless position sensor system |
| CN104748661A (en) * | 2015-04-17 | 2015-07-01 | 兰州理工大学 | Differential transformer type displacement sensor |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI657228B (en) * | 2018-05-03 | 2019-04-21 | 馳達科技股份有限公司 | Linear displacement sensing device |
| EP3888792A1 (en) * | 2020-03-30 | 2021-10-06 | Safran Aero Boosters SA | Module for attracting and detecting debris |
| CN112161560A (en) * | 2020-10-26 | 2021-01-01 | 长江水利委员会长江科学院 | Displacement sensing device and method based on permanent magnet flux measurement |
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| CN107907040B (en) | 2019-04-23 |
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