CN112213671B - Device and method for measuring magnetostriction effect - Google Patents
Device and method for measuring magnetostriction effect Download PDFInfo
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- CN112213671B CN112213671B CN202010975930.4A CN202010975930A CN112213671B CN 112213671 B CN112213671 B CN 112213671B CN 202010975930 A CN202010975930 A CN 202010975930A CN 112213671 B CN112213671 B CN 112213671B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 54
- 239000010453 quartz Substances 0.000 claims description 48
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 48
- 239000000919 ceramic Substances 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 238000013459 approach Methods 0.000 claims description 5
- 239000000284 extract Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract description 13
- 238000005259 measurement Methods 0.000 abstract description 11
- 239000010409 thin film Substances 0.000 abstract description 4
- 239000004519 grease Substances 0.000 description 10
- 238000006073 displacement reaction Methods 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 239000010408 film Substances 0.000 description 3
- 230000005284 excitation Effects 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/18—Measuring magnetostrictive properties
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Abstract
The invention discloses a device and a method for measuring magnetostriction effect, comprising a piezoelectric test bed, a test sample, a vibration unit, a piezoelectric actuator, a signal generator, a controller, a signal acquisition circuit, a magnetic field generating device and a display, wherein the test sample is arranged on the piezoelectric test bed; the invention has low requirements on samples, can measure samples with thin films, van der Waals two-dimensional materials and various insufficient rigidities, does not need the samples to have flat surfaces, and has high measurement precision.
Description
Technical Field
The invention relates to the technical field of magnetostriction measurement, in particular to a device and a method for measuring magnetostriction effect.
Background
Magnetostriction effect measurement is an important experimental method in the physical research of the condensed state; currently, the magnetostriction measurement is mainly performed by a capacitance method, a strain gauge method, a Bragg grating method and the like, but the methods all require that a sample has enough rigidity and cannot be used for measuring a very thin sample or a softer sample; while important materials such as van der waals two-dimensional materials and some film samples, etc. of the current condensed state physical research cannot be measured by these methods.
For example, chinese patent application No. CN201110118500.1, application date 2011, 05 and 09 discloses an optical lever measuring method and measuring device for magneto-rheological grease magnetostriction effect, including: magneto-rheological grease magnetostriction micro-displacement driver and optical lever micro-displacement measuring device based on magneto-rheological grease magnetostriction strain quantity; the magnetorheological grease magnetostrictive micro-displacement driver consists of six parts, namely a sealing screw, a packaging cylinder body, magnetorheological grease, a coil, a piston and a telescopic rod; the magnetorheological grease magnetostrictive micro-displacement driver is internally filled with magnetorheological grease; the optical lever measuring device for the magneto-rheological grease magnetostriction strain quantity consists of a laser emitting system, a plane mirror M1, a plane mirror M2, a lens group amplifying unit, a micro-displacement sensor (PSD) and a signal processing system. The application uses the optical lever micro-displacement to measure the magnetostriction effect of the magnetorheological grease, but only the magnetostriction effect of the magnetorheological grease material can be measured, and the measurement by using the micro-displacement sensor has larger error, so that the magnetostriction effect of the important materials such as Van der Waals two-dimensional materials and some film samples in the current condensed state physical research can not be measured.
Disclosure of Invention
The invention mainly solves the problem that magnetostriction effect measurement cannot be carried out on important materials such as Van der Waals two-dimensional materials and some film samples in the current condensed state physical research in the prior art; the device and the method for measuring the magnetostriction effect have low requirements on samples and high measurement accuracy.
The technical problems of the invention are mainly solved by the following technical proposal: the utility model provides a measure magnetostriction effect's device, includes piezoelectricity test bench, test sample, vibration unit, piezoelectricity executor, signal generator, controller, signal acquisition circuit, magnetic field generating device and display, the test sample is placed on piezoelectricity test bench, vibration unit is located the top of test sample, vibration unit is connected with signal generator, piezoelectricity executor is connected with vibration unit, the controller is connected with piezoelectricity executor, signal generator and piezoelectricity test bench respectively, signal acquisition circuit is connected with vibration unit, signal acquisition circuit is used for gathering vibration unit's amplitude or phase information, signal acquisition circuit is connected with the controller, magnetic field generating device is used for producing the magnetic field and makes the test sample magnetostriction, the display is connected with the controller. The vibration unit is vibrated by utilizing an alternating current signal of the signal generator, the vibration amplitude and the phase of the signal output by the vibration unit are acquired through the signal acquisition circuit, a test sample is close to the vibration unit, the amplitude or the phase of the signal output by the vibration unit can be changed, the piezoelectric actuator is enabled to be in a semi-elongation state by utilizing a voltage signal of the controller, the vibration unit and the test sample are arranged to be relatively stable in amplitude, the amplitude or the phase of the signal output by the vibration unit is locked at a fixed position by adjusting the voltage transmitted to the piezoelectric actuator, a magnetic field is applied, the voltage transmitted to the piezoelectric actuator by the controller is correspondingly changed when the test sample is magnetostrictive, the magnetostrictive magnitude can be obtained according to the corresponding relation between the voltage magnitude and the expansion proportion, the vibration measuring device can be used for measuring the magnetostrictive effect of various materials including thin films and Van der Waals, the sample requirement is low, and the measuring precision is high.
Preferably, the vibration unit comprises a quartz tuning fork, a tuning fork base, piezoelectric ceramics and an insulating sheet, wherein the quartz tuning fork is arranged at the lower end of the tuning fork base, the quartz tuning fork transmits signals to the signal acquisition circuit through an electrode lead, the piezoelectric ceramics is connected with the tuning fork base, the piezoelectric ceramics is connected with the signal generator, the insulating sheet is connected with the tuning fork base, and the piezoelectric actuator is connected with the insulating sheet. The piezoelectric ceramic is vibrated by utilizing the alternating current signal to drive the quartz tuning fork to resonate, the quartz tuning fork vibrates to generate a current signal, the current signal is collected by the signal collecting circuit, and when the frequency of the excitation signal of the piezoelectric ceramic is consistent with the resonance frequency of the quartz tuning fork, the generated current signal is maximum, so that the signal is conveniently collected.
Preferably, the piezoelectric test bed comprises a sample bed and a piezoelectric motor, wherein the sample bed is connected with the output end of the piezoelectric motor, the sample bed is arranged at the upper end of the piezoelectric motor, the test sample is placed on the sample bed, and the piezoelectric motor is connected with the controller. The piezoelectric motor is utilized to move the sample stage, and is not interfered by a magnetic field, so that the measurement accuracy is improved.
Preferably, the piezoelectric motor is a piezoelectric motor having a linear output. The sample stage can be conveniently moved up and down.
Preferably, the magnetic field generating device comprises a permanent magnet or an energized coil. And generating a magnetic field by using a permanent magnet or an electrified coil, so that the magnetostriction effect is generated on the test sample, and the measurement is performed.
Preferably, the signal acquisition circuit comprises a current-voltage conversion circuit, a voltage amplifier and a phase-locked amplifier, wherein the current-voltage conversion circuit converts a current signal generated by resonance of the quartz tuning fork into a voltage signal, the voltage amplifier is connected with the current-voltage conversion circuit, the phase-locked amplifier is connected with the voltage amplifier, the phase-locked amplifier extracts amplitude or phase information of the signal, and the phase-locked amplifier is connected with the controller. And the resonance frequency of the quartz tuning fork is extracted through the lock-in amplifier, so that noise interference is reduced.
A method of measuring magnetostrictive effects comprising the steps of: the piezoelectric ceramic is vibrated by generating an alternating current signal through the signal generator, the quartz tuning fork is driven to vibrate, a current signal is generated when the quartz tuning fork vibrates, and the current signal is transmitted to the current-voltage conversion circuit through the electrode plate; the current signal is converted and amplified and then transmitted to a phase-locked amplifier, and the phase-locked amplifier extracts the amplitude or phase information of the signal; applying voltage to the piezoelectric actuator through the controller to enable the piezoelectric actuator to be in a semi-extension state, and enabling the piezoelectric motor to work to enable the test sample to slowly approach the quartz tuning fork; the amplitude or phase of the quartz tuning fork is stabilized at a fixed position by controlling the magnitude of the voltage applied to the piezoelectric actuator; the magnetic field generating device generates a magnetic field to enable the test sample to generate a magnetostriction effect, the size of the test sample is changed, and in order to enable the amplitude or the phase of the quartz tuning fork to be stabilized at a fixed position, the voltage applied to the piezoelectric actuator is changed along with the change of the size of the test sample; and obtaining the magnetostriction effect of the test sample according to the proportional corresponding relation between the voltage applied to the piezoelectric actuator and the size of the test sample. The invention uses alternating current signal source to make piezoelectric ceramics vibrate, thus driving quartz tuning fork to vibrate, because quartz tuning fork is also a piezoelectric material, quartz tuning fork will generate current signal when vibrating, when the frequency of excitation signal is close to the resonance frequency of quartz tuning fork, current signal will increase rapidly, when they are identical, the invention uses current-voltage converter to convert current signal into voltage and amplify, then inputs into lock-in amplifier, because the quality factor of quartz tuning fork is very high, so that in resonance state, the invention is very sensitive to the force applied by tuning fork, the invention applies voltage to piezoelectric actuator, makes it in semi-elongation state, then uses piezoelectric motor to make sample approach quartz tuning fork slowly, when the atoms on sample surface and atoms on tuning fork arm start to generate acting force, the resonance frequency of quartz tuning fork will change, resulting in amplitude and phase of signal change, at this moment, the invention stops moving piezoelectric motor, through the voltage on the controller to adjust the tuning fork, make the amplitude or phase of quartz signal lock in a fixed position, thus the invention makes sample and keep in a contact state, then the invention is very sensitive to the force applied by the tuning fork, the invention, the length of sample is very small, in order to change the length of sample, the invention is easy to obtain a calibration effect, when the length is very small, the length is changed, and the invention is easy, because the length is changed.
The beneficial effects of the invention are as follows: (1) The invention has low requirements on samples, can measure samples with thin films, van der Waals two-dimensional materials and various insufficient rigidities, has no requirements on the appearance of the samples, and does not need the samples to have flat surfaces; (2) Since the accuracy of the voltage for controlling the piezoelectric actuator is high, the measurement accuracy is also high; (3) The measuring devices are all made of non-magnetic materials, are not easily affected by magnetic fields in the measuring process, and the measuring process is controllable.
Drawings
Fig. 1 is a schematic structural view of a magnetostrictive measuring device according to the first embodiment.
In the figure, a piezoelectric motor, a sample stage, a test sample, a quartz tuning fork, a tuning fork base, piezoelectric ceramics, an insulating sheet and a piezoelectric actuator are shown in the specification, wherein the piezoelectric motor is shown in the specification, the sample stage is shown in the specification, the test sample is shown in the specification, the quartz tuning fork is shown in the specification, and the tuning fork base is shown in the specification.
Detailed Description
The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings.
Embodiment one: the device for measuring magnetostriction effect comprises a piezoelectric motor 1, a sample table 2, a test sample 3, a quartz tuning fork 4, a tuning fork base 5, piezoelectric ceramics 6, an insulating sheet 7, a piezoelectric actuator 8, a signal generator, a controller, a current-voltage conversion circuit, a voltage amplifier, a phase-locked amplifier, a magnetic field generating device and a display, wherein the piezoelectric motor 1 is placed on the ground, the sample table 2 is connected with the output end of the piezoelectric motor 1, the sample table 2 is installed at the upper end of the piezoelectric motor 1, the test sample 3 is placed on the sample table 2, the piezoelectric motor 1 is connected with the controller, the quartz tuning fork 4 is installed at the lower end of the tuning fork base, the quartz tuning fork 4 transmits signals to the current-voltage conversion circuit through electrode leads, the piezoelectric ceramics 6 is connected with the tuning fork base 5, the piezoelectric ceramics 6 is connected with the signal generator, the insulating sheet 7 is connected with the tuning fork base 5, the piezoelectric actuator 8 is connected with the insulating sheet 7, the current-voltage conversion circuit converts current signals generated by resonance of the quartz tuning fork 4 into voltage signals, the voltage amplifier is connected with the current-voltage conversion circuit, the phase-locked amplifier is connected with the voltage amplifier, the signal amplifier is extracted by the signal amplifier is connected with the voltage amplifier, the signal generator is used for generating magnetostriction signal, the amplitude amplifier is used for generating the magnetic field signal is used for generating the magnetic field, the magnetic field is generated by the signal is used for displaying magnetostriction effect, the magnetostriction is small, the signal is used for testing the test sample is connected with the magnetic field is used for testing device.
The piezoelectric motor 1 is a piezoelectric motor 1 having a linear output.
The magnetic field generating means comprises a permanent magnet or an energized coil.
A method of measuring magnetostrictive effects comprising the steps of:
the piezoelectric ceramic 6 is vibrated by generating an alternating current signal through the signal generator to drive the quartz tuning fork 4 to vibrate, a current signal is generated when the quartz tuning fork 4 vibrates, and the current signal is transmitted to the current-voltage conversion circuit through the electrode plate; the current signal is converted and amplified and then transmitted to a phase-locked amplifier, and the phase-locked amplifier extracts the amplitude or phase information of the signal; applying voltage to the piezoelectric actuator 8 through the controller to enable the piezoelectric actuator 8 to be in a semi-extension state, and enabling the piezoelectric motor 1 to work to enable the test sample 3 to slowly approach the quartz tuning fork 4; the amplitude or phase of the quartz tuning fork 4 is stabilized at a fixed position by controlling the magnitude of the voltage applied to the piezoelectric actuator 8; the magnetic field generating device generates a magnetic field to generate a magnetostriction effect on the test sample 3, the size of the test sample 3 changes, and the voltage applied to the piezoelectric actuator 8 changes along with the change of the size of the test sample 3 in order to stabilize the amplitude or phase of the quartz tuning fork 4 at a fixed position; the magnitude of the magnetostriction effect of the test sample 3 is obtained from the proportional correspondence between the voltage applied to the piezoelectric actuator 8 and the size of the test sample 3.
The invention uses alternating current signal source to make piezoelectric ceramics 6 vibrate, thus drive quartz tuning fork 4 to vibrate, because quartz tuning fork 4 is also a piezoelectric material, quartz tuning fork 4 will produce current signal when vibrating, when the frequency of exciting signal is close to resonance frequency of quartz tuning fork 4, current signal will increase rapidly, when they are identical, the invention uses current-voltage converter to convert current signal into voltage and amplify, then inputs into lock-in amplifier, because the quality factor of quartz tuning fork 4 is very high, therefore in resonance state, the invention is very sensitive to tuning fork force, the invention firstly applies voltage to piezoelectric actuator 8 to make it in semi-elongation state, then uses piezoelectric motor 1 to make sample slowly approach quartz tuning fork 4, when the atoms on sample surface and atoms on the arms start to produce acting force, the resonance frequency of quartz tuning fork 4 will change, resulting in amplitude and phase change of signal, at this moment, the invention stops moving piezoelectric motor 1, voltage on piezoelectric actuator 8 is regulated by controller, make quartz 4 signal amplitude or phase lock in a fixed position, thus make the invention keep in a fixed position, in order to make the invention and the length change with the length of sample in order to make the invention, when the length change with the length of sample is just-applied to make the sample, the invention is equal to the length change, then, in order to make the length change with the length of sample is applied to the length of the sample, the invention is equal to the length of the sample is changed, the invention thus makes it easy to obtain the magnitude of the magnetostriction effect of the sample.
The invention has low requirements on samples, can measure samples with thin films, van der Waals two-dimensional materials and various insufficient rigidities, has no requirements on the appearance of the samples, and does not need the samples to have flat surfaces; since the accuracy of the voltage for controlling the piezoelectric actuator 8 is high, the measurement accuracy is also high; the measuring devices are all made of non-magnetic materials, are not easily affected by magnetic fields in the measuring process, and the measuring process is controllable.
The above-described embodiment is only a preferred embodiment of the present invention, and is not limited in any way, and other variations and modifications may be made without departing from the technical aspects set forth in the claims.
Claims (7)
1. An apparatus for measuring magnetostriction effects, comprising:
the device comprises a piezoelectric test bed, a test sample, a vibration unit, a piezoelectric actuator, a signal generator, a controller, a signal acquisition circuit, a magnetic field generating device and a display, wherein the test sample is placed on the piezoelectric test bed, the vibration unit is positioned above the test sample, the vibration unit is connected with the signal generator, the piezoelectric actuator is connected with the vibration unit, the controller is respectively connected with the piezoelectric actuator, the signal generator and the piezoelectric test bed, the signal acquisition circuit is connected with the vibration unit, the signal acquisition circuit is used for acquiring amplitude or phase information of the vibration unit, the signal acquisition circuit is connected with the controller, the magnetic field generating device is used for generating a magnetic field to enable the test sample to generate magnetostriction, and the display is connected with the controller;
the vibration unit is vibrated by utilizing an alternating current signal of the signal generator, the vibration amplitude and the phase of the signal output by the vibration unit are acquired through the signal acquisition circuit, a test sample is close to the vibration unit, the amplitude or the phase of the signal output by the vibration unit can be changed, the piezoelectric actuator is enabled to be in a semi-elongation state through a voltage signal of the controller, the vibration unit and the test sample are arranged to be relatively stable in amplitude, the amplitude or the phase of the signal output by the vibration unit is locked at a fixed position through adjusting the voltage transmitted to the piezoelectric actuator, a magnetic field is applied, the magnetostriction is generated on the test sample, the voltage transmitted to the piezoelectric actuator by the controller is correspondingly changed, and the magnetostriction can be obtained according to the corresponding relation between the voltage and the expansion proportion.
2. A device for measuring magnetostrictive effects as defined in claim 1, wherein,
the vibration unit comprises a quartz tuning fork, a tuning fork base, piezoelectric ceramics and an insulating sheet, wherein the quartz tuning fork is arranged at the lower end of the tuning fork base, signals are transmitted to a signal acquisition circuit through electrode leads, the piezoelectric ceramics is connected with the tuning fork base, the piezoelectric ceramics is connected with a signal generator, the insulating sheet is connected with the tuning fork base, and the piezoelectric actuator is connected with the insulating sheet.
3. A device for measuring magnetostrictive effects as defined in claim 2, wherein,
the piezoelectric test bed comprises a sample bed and a piezoelectric motor, the sample bed is connected with the output end of the piezoelectric motor, the sample bed is arranged at the upper end of the piezoelectric motor, a test sample is placed on the sample bed, and the piezoelectric motor is connected with the controller.
4. A device for measuring magnetostrictive effects as defined in claim 3, wherein,
the piezoelectric motor is a piezoelectric motor having a linear output.
5. A device for measuring magnetostrictive effects according to claim 1 or 2, characterized in that,
the magnetic field generating device comprises a permanent magnet or an energized coil.
6. A device for measuring magnetostrictive effects as defined in claim 3, wherein,
the signal acquisition circuit comprises a current-voltage conversion circuit, a voltage amplifier and a phase-locked amplifier, wherein the current-voltage conversion circuit converts a current signal generated by quartz tuning fork resonance into a voltage signal, the voltage amplifier is connected with the current-voltage conversion circuit, the phase-locked amplifier is connected with the voltage amplifier, the phase-locked amplifier extracts amplitude or phase information of the signal, and the phase-locked amplifier is connected with the controller.
7. A method of measuring magnetostrictive effects using an apparatus for measuring magnetostrictive effects as defined in claim 6, comprising the steps of:
the piezoelectric ceramic is vibrated by generating an alternating current signal through the signal generator, the quartz tuning fork is driven to vibrate, a current signal is generated when the quartz tuning fork vibrates, and the current signal is transmitted to the current-voltage conversion circuit through the electrode plate;
the current signal is converted and amplified and then transmitted to a phase-locked amplifier, and the phase-locked amplifier extracts the amplitude or phase information of the signal;
applying voltage to the piezoelectric actuator through the controller to enable the piezoelectric actuator to be in a semi-extension state, and enabling the piezoelectric motor to work to enable the test sample to slowly approach the quartz tuning fork;
the amplitude or phase of the quartz tuning fork is stabilized at a fixed position by controlling the magnitude of the voltage applied to the piezoelectric actuator;
the magnetic field generating device generates a magnetic field to enable the test sample to generate a magnetostriction effect, the size of the test sample is changed, and in order to enable the amplitude or the phase of the quartz tuning fork to be stabilized at a fixed position, the voltage applied to the piezoelectric actuator is changed along with the change of the size of the test sample;
and obtaining the magnetostriction effect of the test sample according to the proportional corresponding relation between the voltage applied to the piezoelectric actuator and the size of the test sample.
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| KR20150071428A (en) * | 2013-12-18 | 2015-06-26 | 삼성전기주식회사 | Magnetic field sensor and sensing apparatus using thereof |
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