CN106597329A - Automatic magneto-electricity coefficient test system - Google Patents
Automatic magneto-electricity coefficient test system Download PDFInfo
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- CN106597329A CN106597329A CN201611004867.XA CN201611004867A CN106597329A CN 106597329 A CN106597329 A CN 106597329A CN 201611004867 A CN201611004867 A CN 201611004867A CN 106597329 A CN106597329 A CN 106597329A
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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
- G01R33/1253—Measuring galvano-magnetic properties
Abstract
The invention, which belongs to the material performance testing field, discloses an automatic magneto-electricity coefficient test system comprising a computer, a direct-current bias magnetic field generating module, an alternating-current magnetic field generating module, a signal detecting module, and a sample holding module. A to-be-tested sample is placed in the sample holding module and is arranged in Helmholtz coils of the alternating-current magnetic field generating module; and the Helmholtz coils are arranged in an electromagnet air gap of the direct-current bias magnetic field generating module. The signal detecting module detects an induced voltage signal of the to-be-tested sample and transmits the signal to the computer; and calculation is carried out by the computer to obtain a needed magneto-electricity coefficient. With the system provided by the invention, testing of a changing rule of small and medium type thin-film materials by factors like the size and direction of a bias magnetic field and size and frequency of an alternating magnetic field can be realized in an alternating magnetic field of over 100 kHz; and the test system has characteristics of high intelligent level and high testing precision.
Description
Technical field
The invention belongs to material properties test field, more particularly, to a kind of automatized magnetic electrostrictive coefficient test system.
Background technology
Magnetoelectric effect refers to that some multi-iron materials induce voltage in the presence of externally-applied magnetic field or make in extra electric field
The phenomenon in magnetic field is induced with.Material with magnetoelectric effect in terms of information Store and microelectronic component such as wave filter, biography
The application potential of the aspects such as sensor has caused the extensive concern of researchers, also has extensive prospect in actual applications.
Generally, we characterize magnetoelectric effect power with magnetic-electric coefficient, i.e., unit externally-applied magnetic field is converted into electropolarized size or additional
The size of the induced field that unit electric field is generated.Studying come the mechanism of analyzing influence magnetoelectric effect by magnetic-electric coefficient, from
And magnetoelectric effect coupling is improved, it is finally reached wide variety of purpose in practice.At present, the material with magnetoelectric effect
In the magnetoelectric effect that shown with compound magnetoelectric material it is more excellent, wherein magnetoelectricity laminar composite is because its preparation is convenient, property
The advantages of energy is prominent, leakage property is little is particularly subject to each side's attention.The magnetoelectric effect mechanism of magnetoelectricity laminar composite be a kind of magnetic-
The effect of power-electricity multi- scenarios method, its magnetic-electric coefficient can be expressed as α ME=dE/dH=dE/d σ × d σ/dH, and magnetic field passes through magnetic
The magnetostrictive effect of layer is converted into ess-strain, and as the mechanical couplings at interlayer contact interface are acted on, magnetospheric stress should
Change passes to piezoelectric layer, and piezoelectric layer is stressed effects of strain and is converted into induced voltage, realizes magnetic field to the conversion of electric field.Accordingly
The mechanism of magnetoelectric effect, the method for testing of magnetic-electric coefficient have static method and dynamic method, wherein, dynamic method more rapidly, it is anti-interference, more
Accurately, therefore using more.Magnetic-electric coefficient tests solid state process i.e. in the presence of D.C. magnetic field, and the alternating magnetic field of an additional perturbation makes
Magnetic-electric coefficient under the conditions of magnetic electric compound material acquisition resonance or disresonance, magnetic-electric coefficient α ME=dE/dH ≈ Δ E/ Δ H, its
Middle Δ E and Δ H can be represented with the amplitude of the alternating voltage of perturbation alternating magnetic field generation and alternating magnetic field.At present, with can
Magnetoelectric material for practical application is mainly magnetic electric compound material, and they have larger magnetic-electric coefficient, at normal temperatures or
Wide temperature range can use.And as the most important parameter magnetic-electric coefficient of magnetoelectric material measurement be we study magnetoelectric effect must
An indispensable step.
Bracke in 1981 et al. is disclosed herein the test device of their magnetic-electric coefficients in opinion, employs signal generator
A pair of Helmholtz coils are driven and reached to produce frequency the uniform AC magnetic field of 100kHz, biasing magnetic is produced with permanent magnet
, with voltage on impedance transformer collection magnetoelectric material；Its shortcoming mainly has the regulation of D.C. magnetic field time-consuming and error is big, alternation
The size of magnetic field and bias magnetic field is all without real-time monitoring.Mahesh Kumar in 1997 adjust electromagnetism with PC control motor
The change of ferrum, reads output data using lock-in amplifier.Lock-in amplifier improves the impact of noise in output signal, improves
Certainty of measurement；Jungho Ryu in 2002 etc. replace permanent magnet to provide bias magnetic field using the electric magnet of power drives, and with suddenly
You measure bias magnetic field size by probe in real time, using charge amplifier and oscilloscope measurement output voltage values；Nan Cewen in 2006
Combined with e measurement technology using computer technology Deng in the patent, realize magnetic-electric coefficient test automation, and improve test
The probe clamping device of sample；Thayer in 2011 etc. develops tele-control system and realizes that long-range magnetoelectric measurement is passed with data
It is defeated；Chen in 2014 et al. studies the change rule of magnetic-electric coefficient when applying stress using the clamping device of spring squeezing splints
Rule.Sum it up, the research of coefficient tester for electromagnetic still exploitation improve in, the deficiency that current technology is still suffered from has：At present
Test system for signal is fainter, still have deficiency using the test of wider Film laminated magnetoelectric material, wherein most
The AC magnetic field frequency of test within 100kHz, the resonance frequency range of the magnetoelectric material of test process miniaturization filming
Effectively cannot measure in more than 100kHz；In the clamping process of sample, sample receives extraneous stress, so as to have to test result
It is certain to affect；Additionally, automaticity in magnetic electricity performance tester, the convenience for operating and using, interface succinct attractive in appearance and
The aspect such as safe and reliable of data storage has larger room for improvement.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of automatized magnetic electrostrictive coefficient test system
, there is module, AC magnetic field by computer, DC bias magnetic field and module, signal detection module and sample clamping mould occur in system
The several modules of block are cooperated jointly, are extended magnetic-electric coefficient test frequency scope, are thus solved the magnetic electric compound material to smallerization
The technical problem of magnetic-electric coefficient test.
For achieving the above object, according to one aspect of the present invention, there is provided a kind of automatized magnetic electrostrictive coefficient test system,
The test system includes that computer, DC bias magnetic field occur module, AC magnetic field and module, signal detection module and sample occur
Self-clamping module, it is characterised in that：
The DC bias magnetic field occurs module includes one group of electric magnet, DC source and Gaussmeter, wherein, described one group
Electric magnet is oppositely arranged, and is connected with the DC source respectively, for obtaining DC bias magnetic field, the Gaussmeter with it is described
Computer is connected, and for detecting the size of the DC bias magnetic field of sample to be measured, the DC source is mutual with the computer
Even, on the one hand the DC source powers to the magnet spool, while the magnitude of voltage of the supply voltage is passed to described
Computer, on the other hand, the DC source receives the signal from the computer, realizes the regulation to the supply voltage；
The AC magnetic field occurs module includes one group of Helmholtz coil, alternating current power supply and ammeter, three's series connection structure
Into loop, wherein, the alternating current power supply is also connected with the computer, for providing alternating current to the Helmholtz coil,
The voltage signal of the alternating current is passed to into the computer simultaneously, one group of Helmholtz coil is oppositely arranged and is placed on
Between the air gap of one group of electric magnet, for obtaining AC magnetic field, the ammeter is real in the AC magnetic field for detecting
The size of border electric current；
The signal detection module includes lock-in amplifier and circuit tester, one end and the sample clamping mould after the two parallel connection
Block is connected, and the other end is connected with the computer, for detecting the magnitude of voltage of the alternating voltage in testing sample and being transferred to institute
State computer；
The sample clamping module is arranged between the Helmholtz coil, for testing sample is placed on AC magnetism
In；
The computer is used to receive the voltage signal from disparate modules, and the magnetic needed for the signal of change is converted into
Electrostrictive coefficient.
Preferably, AC magnetic field is also in series with sampling resistor in there is module, while the sampling resistor is mutually put with the lock
Big device is connected, and for providing reference signal for the lock-in amplifier, improves the certainty of measurement of the lock-in amplifier.
Preferably, the circuit tester preferably adopts six and half circuit tester.
Preferably, the sample clamping module includes sample carrier, pillar and chassis, and testing sample is placed on the sample carrier
Saddle on, the lead on the sample saddle is connected with testing sample, and the other end of the lead is fixed on the pillar and bottom
On disk, and it is connected with the signal detection module.
Preferably, preferably by an edge bias magnetic field of the sample length of side length when in the sample clamping module, sample is placed
Direction is placed, and rotates the direction of the bias magnetic field loaded on the sample carrier scalable sample.
Preferably, the computer includes that self-inspection and hardware monitoring, performance measurement, characteristic curve are shown in real time and data are led
Go out.
In general, by the contemplated above technical scheme of the present invention compared with prior art, can obtain down and show
Beneficial effect：
1st, it is of the invention by way of using lock-in amplifier and circuit tester parallel connection, compared with prior art, circuit tester
Parallel connection cause test process in the frequency of AC magnetic field that can test reach 300kHz, so as to realize miniaturization thin film
The test of the material of change；
2nd, by the magnetic field using each functional module in real-time monitoring of computer whole system and voltage letter in the present invention
Number so that whole test process is more intelligent, and reduces the test error that anthropic factor is caused；
3rd, contain the Gaussmeter for being used to monitoring bias magnetic field size in the present invention, and connect in alternating magnetic field produces circuit
There is the size of ammeter real time record alternating magnetic field, in voltage signal detection circuit have sampling resistor homogenous frequency signal to be provided to lock
Phase amplifier is so as to obtaining the voltage signal of strong interference immunity；
4th, by testing sample being placed on sample saddle, in prior art using sample clamping module in the present invention
Clamp sample under external force to compare, the sample in the present invention reduces the magnetoelectric induction electricity that extraneous stress treat test sample
The error of pressure affects；
5th, there is module, signal detection by there is module, AC magnetic field using computer, DC bias magnetic field in the present invention
Module and the several modules of sample clamping module are cooperated jointly, realize to testing sample with bias magnetic field size and Orientation, hand over
The test of the multifactorial Changing Pattern such as the size and frequency of varying magnetic field.
Description of the drawings
Fig. 1 is according to the test system hardware structure chart constructed by the preferred embodiments of the present invention；
Fig. 2 is according to the test system sample stage structural representation constructed by the preferred embodiments of the present invention；
Workflow diagrams of the Fig. 3 according to the computer constructed by the preferred embodiments of the present invention；
Fig. 4 is according to test software test interface figure and body window in the computer constructed by the preferred embodiments of the present invention
Structure chart；
Fig. 5 is according to the computer testing software Serial Communication flow chart constructed by the preferred embodiments of the present invention；
Fig. 6 is according to the test software broken line graph Real-time Display Design flow chart constructed by the preferred embodiments of the present invention；
Fig. 7 derives flow chart according to the test software data excel form constructed by the preferred embodiments of the present invention；
Fig. 8 is according to the magnetic-electric coefficient constructed by the preferred embodiments of the present invention with bias magnetic field variation relation figure；
The graph of a relation that Fig. 9 changes with alternating magnetic field frequency according to the magnetic-electric coefficient constructed by the preferred embodiments of the present invention.
In all of the figs, identical reference be used for represent identical element or structure, wherein：
1- DC source 2- alternating current power supply 3- electric magnet 4- Helmholtz coil 5- sample clamping module 6- Gaussmeters
7- lock-in amplifier 8- circuit tester 9- ammeter 10- sampling resistor 11-USB hub 12- computers 13- arranges mother 14-
Pillar 15-PCB plate 16- testing sample 17- solder joint 18- ends pricking with needle 19- sample carriers
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, and
It is not used in the restriction present invention.As long as additionally, technical characteristic involved in invention described below each embodiment
Do not constitute conflict each other can just be mutually combined.
A kind of test system of automatic test magnetoelectric material magnetic-electric coefficient, Fig. 1 is according to the preferred embodiments of the present invention institute structure
The test system hardware structure chart built；As shown in figure 1, the system includes：There is module, hand in computer, DC bias magnetic field
There is module, signal detection module and sample clamping module in stream magnetic field, wherein：
There is module and include in DC bias magnetic field：Electric magnet, DC source and Gaussmeter, wherein：
The signal output part of the Gaussmeter is connected with the measurement signal input of the computer；
DC source, with the computer interconnection, receives the control signal of the computer, to the computer export direct current
Voltage signal, meanwhile, the direct current power box is powered for the magnet spool；
Electric magnet, the DC source are powered to magnet spool, make electric magnet obtain the straight of said computer requirement
Stream bias magnetic field.
DC bias magnetic field occurs module, and specifically connection and generating process are as follows：
Regulating magnet air-gap separation so as to for 50mm, fix Gaussmeter probe using support uniform at electric magnet center
Field region, is magnetic direction and probe vertical, preheats Gaussmeter 20min and reaches accuracy rating.DC source and electromagnetism
After the completion of the connection of ferrum, power-on is simultaneously set as current output mode.In the relation using front verification magnetic field and electric current
It is H=444.7 × I+22.5 that magnetic field is obtained with the relational expression of electric current linear change, and the fit correlation formula can be used as in software programming
The reference of D.C. magnetic field output control.Connection DC source and electric magnet, after opening Gaussmeter, the output of D.C. magnetic field part and
Monitoring can be regulated and controled and be recorded by computer software D.C. magnetic field module.
There is module and include in AC magnetic field：Helmholtz coil, alternating current power supply, ammeter, wherein：
Alternating current power supply is driving power supply, it is possible to provide 0.1Hz～200kHz scopes, and resolution up to the AC signal of 0.1Hz is
Helmholtz coil is powered, and is connected with the computer, receives the control signal of the computer, exchanges to the computer export
Voltage signal；
Helmholtz coil, induction coil size are radius 10mm, and the number of turn 20 encloses a pair of coaxial coils, using CH-1600
Digital gaussmeter detected, coordinates the Theoretical Calculation of Faraday law of electromagnetic induction to demarcate in 1kHz in Helmholtz coil
Core field and the relation of electric current, obtain relational expression for H=1.1289I+0.0045；The magnetic field of Helmholtz coil under different frequency
Calibrated by induction coil, the reading for keeping ammeter is that 1A is constant, the alternating magnetic field that size is 2Oe or so can be obtained.
Ammeter, is connected on AC magnetic field and produces in circuit, the size of the AC magnetic field under monitor in real time different frequency
Stability；
Signal detection module, is composed in parallel by lock-in amplifier, sampling resistor and high accuracy number circuit tester, and both is defeated
Enter end to be all connected with sample signal outfan, outfan all selects RS232 remote interfaces to be connected with usb hub and then be connected meter
Calculation machine, wherein：
Lock-in amplifier, two input passages are connected with described sample outfan and sampling resistor outfan respectively,
The outfan of the lock-in amplifier connects computer by usb hub, transmits the magnetoelectricity voltage signal of sample generation to calculating
Machine.
Sampling resistor, 1 Ω, the power resistor of 20W, to the reference input that its load voltage is accessed lock-in amplifier
End, there is provided micro voltage signal measures the reference signal of part lock-in amplifier, reduces noise, improves certainty of measurement；
In high precision the input and outfan of six Semi-digital circuit tester digital multimeter respectively with the sample outfan
Be connected with usb hub input, the magnetoelectricity voltage signal of sample generation is transmitted to computer.
Sample clamping module, is placed on axis line position in Helmholtz coil along the direction in applied bias magnetic field, the sample
Product self-clamping module is mainly made up of a few parts in sample carrier, saddle, pillar and chassis, and Fig. 2 is according to the preferred embodiments of the present invention institute
The test system sample stage structural representation of structure, as shown in Fig. 2 wherein：
Sample carrier is the pcb board that a size is 16 × 10 × 2mm3, and the weldering of connection sample lead is distributed with PCB panel
The signal exit pricking with needle at contact, lead and edge；
Saddle, pillar and chassis are insulation, non-magnetic plastic, wherein：
Saddle is the cylinder of a diameter of 18mm, and upper surface is diametrically carved with the groove of wide 10mm depths 2mm, for placing
Sample carrier；
Pillar is carved with groove for placing wire along y direction, is fixed with plastics screw between chassis and saddle；
Sample places major axis along bias magnetic field direction, and with this position as 0 ° of position, rotatable saddle adjusts externally-applied magnetic field pair
0～360 ° in the action direction horizontal plane of sample；
The sample placement module draws the voltage signal of magnetoelectric effect sensing by lead, with lock-in amplifier and high-precision
Degree digital multimeter connection, and it is transferred to computer disposal.
The computer includes that self-inspection and hardware monitoring, performance measurement, characteristic curve are shown in real time and data are derived, figure
3 according to the computer constructed by the preferred embodiments of the present invention workflow diagram, Fig. 4 is according to the preferred embodiments of the present invention institute
Test software test interface figure and body window structure chart in the computer of structure, as shown in Figure 3 and Figure 4,
Fig. 5 according to the computer testing software Serial Communication flow chart constructed by the preferred embodiments of the present invention, such as
Shown in Fig. 5, the self-inspection and hardware monitoring, wherein self-inspection are mainly software by scanning serial ports and sending version to corresponding instrument equipment
The data of reading and Given information are carried out matching check to determine whether instrument communicates successfully and provide corresponding by this Query Information
Information, hardware monitoring mainly monitors the serial ports for communicating, the size of D.C. magnetic field, frequency of AC magnetic field etc..
Performance measurement, is respectively directed to magnetic-electric coefficient with the Changing Pattern in applied bias magnetic field, magnetic-electric coefficient with alternating magnetic field
The change etc. of frequency Changing Pattern and magnetic-electric coefficient with alternating magnetic field size.
Characteristic curve is shown in real time, is realized by JFreechart broken line graphs, including magnetic-electric coefficient under low frequency condition with straight
Relation curve of the relation curve and magnetic-electric coefficient in stream magnetic field with AC magnetic field frequency, Fig. 6 is according to the preferred embodiments of the present invention
Constructed test software broken line graph Real-time Display Design flow chart, as shown in Figure 6.
Data export module stores data into Excel using jxl instrument class libraries, is easy to follow-up derivation, and Fig. 7 is according to this
Test software data excel, TXT form constructed by bright preferred embodiment derives flow chart, as shown in Figure 7.
Below the specific course of work of the present invention is further described：
1) laminar composite sample extraction wire to be measured is connected on the fixed solder joint of pcb board, fixes the pcb board and exist
On sample carrier, in making the row mother that the pricking with needle on pcb board is embedded on sample carrier just；
2) testing sample and sample clamping module are placed in AC and DC magnetic field together, sample is adjusted to angle to be measured,
It is identical with AC magnetic field direction；
3) computer carries out System self-test, checks whether each hardware device communication is normal；
Method one：
4) piezoelectric layer thickness t is input in a computer, test curve performance α E-Hdc is selected, test magnetic-electric coefficient is with straight
The Changing Pattern of stream bias magnetic field Hdc sizes, arranges the magnitude range of test DC bias magnetic field, controls unidirectional current using software
The inspection of the size of current and Gaussmeter in source makes the DC bias magnetic field that electric magnet is provided change by setting from small to large, AC magnetism
Field acquiescence provides AC magnetic field of the 1kHz sizes for 1Oe；
5) by lock-in amplifier fixed point collection magnetoelectricity voltage signal, computer is automatically by computing formulaMeter
Calculate a series of corresponding magnetoelectricity series numerical value；
6) in computer, real-time broken line graph display module shows size variation rule of the magnetic-electric coefficient with applied bias magnetic field
Curve；
7) derive excel data from computer to be preserved, to treat further to analyze under certain AC magnetic field frequency, magnetic
Changing Patterns of the electrostrictive coefficient α E with applied bias magnetic field Hdc.
Method two：
4) in computer software be input into piezoelectric layer thickness t, select test curve performance α E-fac, test magnetic-electric coefficient with
The Changing Pattern of AC magnetic field frequency fdc, arranges the frequency range of test AC magnetic field, controls alternating current power supply using software, makes
Helmholtz coil produces the AC magnetic field of different frequency formed objects, controls the school of the size of current and Gaussmeter of DC source
Test the DC bias magnetic field of the arranges value size for providing electric magnet；
5) by lock-in amplifier and high accuracy number circuit tester fixed point collection magnetoelectricity voltage signal, computer automatically by
Computing formulaCalculate a series of corresponding magnetoelectricity series numerical value；
6) in computer, real-time broken line graph display module shows the law curve that magnetic-electric coefficient changes with AC magnetic field frequency；
7) derive excel data from computer to be preserved, to treat further to analyze under certain DC bias magnetic field,
Changing Patterns of the magnetic-electric coefficient α E with AC magnetic field frequency fdc.
Below by taking Terfenol-D/PZT straticulate structures as an example, the operation of different method of testings of the present invention is illustrated
Process.
Example one：Tb-Dy-Fe alloy Terfenol-D/ lead zirconate titanate PZT lamellar composite magnetoelectricity structures
Terfenol-D/PZT composite constructions extraction wire on the electrode of PZT upper and lower surfaces on pcb board is placed, and will
Wire solder joint connection corresponding with pcb board, places sample carrier pcb board, is stuck on the saddle of sample clamping module, believes extraction
Number pcb board on pricking with needle it is embedded along row mother that sample column is laid, adjust saddle direction, make the major axis of testing sample along biasing
Magnetic direction.Connect and open each equipment, open computer software, self-inspection is carried out to each instrument, PZT thickness degree t are set, in magnetic
Electrical testing module selects test curve type α E-Hdc, arranges fac initial values, after arranging Hdc test scopes, starts test, soft
Part module obtains a series of magnetoelectricity magnitudes of voltage by signal detection module, by the magnetic-electric coefficient for obtaining, with output bias magnetic field
High low signal is depicted as real-time testing curve together, and Fig. 8 is according to the magnetic-electric coefficient constructed by the preferred embodiments of the present invention with inclined
Changes of magnetic field graph of a relation is put, as shown in figure 8, finally deriving test data result.
Example two：Tb-Dy-Fe alloy Terfenol-D/ lead zirconate titanate PZT lamellar composite magnetoelectricity structures
Terfenol-D/PZT composite constructions extraction wire on the electrode of PZT upper and lower surfaces on pcb board is placed, and will
Wire solder joint connection corresponding with pcb board, places sample carrier pcb board, is stuck on the saddle of sample clamping module, believes extraction
Number pcb board on pricking with needle it is embedded along row mother that sample column is laid, adjust saddle direction, make the major axis of testing sample along biasing
Magnetic direction.Connect and open each equipment, open computer software, self-inspection is carried out to each instrument, PZT thickness degree t are set, in magnetic
Electrical testing module selects test curve type α E-fac, arranges Hdc initial values, after arranging fac test scopes, starts test, soft
Part module obtains a series of magnetoelectricity magnitudes of voltage by signal detection module, by the magnetic-electric coefficient for obtaining, with output AC magnetic field
Frequency signal is depicted as real-time testing curve together, and Fig. 9 is according to the magnetic-electric coefficient constructed by the preferred embodiments of the present invention with friendship
The graph of a relation of varying magnetic field frequency change, as shown in figure 9, finally deriving test data result.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, not to
The present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc. are limited, all should be included
Within protection scope of the present invention.
Claims (6)
1. a kind of automatized magnetic electrostrictive coefficient test system, the test system include that computer (12), DC bias magnetic field occur mould
There is module, signal detection module and sample clamping module in block, AC magnetic field, it is characterised in that：
The DC bias magnetic field occurs module includes one group of electric magnet (3), DC source (1) and Gaussmeter (6), wherein, institute
State one group of electric magnet (3) to be oppositely arranged, and be connected with the DC source (1) respectively, it is for obtaining DC bias magnetic field, described
Gaussmeter is connected with the computer, for detecting the size of the DC bias magnetic field of sample to be measured, the DC source (1)
Interconnect with the computer (12), on the one hand the DC source powers to the magnet spool, while by the supply voltage
Magnitude of voltage pass to the computer, on the other hand, the DC source receives the signal from the computer, realizes to institute
State the regulation of supply voltage；
The AC magnetic field occurs module includes one group of Helmholtz coil (4), alternating current power supply (2) and ammeter (9), three's string
Connection constitutes loop, wherein, the alternating current power supply is also connected with the computer, for providing exchange to the Helmholtz coil
Electricity, while the voltage signal of the alternating current is passed to the computer, one group of Helmholtz coil is oppositely arranged and puts
Put between the air gap of one group of electric magnet, for obtaining AC magnetic field, the ammeter is used to detect the AC magnetic field
The size of middle actual current；
The signal detection module includes lock-in amplifier (7) and circuit tester (8), one end and the sample clamping after the two parallel connection
Module is connected, and the other end is connected with the computer, for detecting the magnitude of voltage of the alternating voltage in testing sample and being transferred to
The computer；
The sample clamping module (5) is arranged between the Helmholtz coil, for testing sample is placed on AC magnetism
In；
The computer (12) is for receiving the voltage signal from disparate modules, and the signal of change is converted into required magnetic
Electrostrictive coefficient.
2. a kind of automatized magnetic electrostrictive coefficient test system as claimed in claim 1, it is characterised in that AC magnetic field occurs module
In be also in series with sampling resistor (10), while the sampling resistor is connected with the lock-in amplifier, for mutually amplifying for the lock
Device provides reference signal, improves the certainty of measurement of the lock-in amplifier.
3. a kind of automatized magnetic electrostrictive coefficient test system as claimed in claim 1 or 2, it is characterised in that the circuit tester is excellent
Choosing adopts six and half circuit tester.
4. a kind of automatized magnetic electrostrictive coefficient test system as described in any one of claim 1-3, it is characterised in that the sample
Self-clamping module includes sample carrier (19), pillar (14) and chassis, and testing sample is placed on the saddle of the sample carrier, the sample
Lead on saddle is connected with testing sample, and the other end of the lead is fixed on the pillar and chassis, and with the letter
Number detection module is connected.
5. a kind of automatized magnetic electrostrictive coefficient test system as claimed in claim 4, it is characterised in that the sample clamping module
Preferably the direction of an edge bias magnetic field of sample length of side length is placed when middle sample is placed, rotate the sample carrier scalable sample
The direction of the bias magnetic field loaded on product.
6. a kind of automatized magnetic electrostrictive coefficient test system as described in any one of claim 1-5, it is characterised in that the calculating
Machine includes that self-inspection and hardware monitoring, performance measurement, characteristic curve are shown in real time and data are derived.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562862A (en) * | 2018-06-21 | 2018-09-21 | 宁波大学 | A kind of specimen holder device for the test of magneto-electric coupled coefficient |
| CN109374093A (en) * | 2018-10-12 | 2019-02-22 | 深圳砺剑脑科学科技有限公司 | Micro weight measuring circuit |
| CN112068052A (en) * | 2020-09-15 | 2020-12-11 | 苏州大学 | High-precision multifunctional temperature-changing magnetoelectric test system |
| CN113295764A (en) * | 2021-04-12 | 2021-08-24 | 西安理工大学 | Energy conversion modeling method based on generalized magnetoelectric effect |
| CN113687277A (en) * | 2021-10-26 | 2021-11-23 | 广东海洋大学 | Test method and system for magnetoelectric composite material sensor |
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| CN108562862A (en) * | 2018-06-21 | 2018-09-21 | 宁波大学 | A kind of specimen holder device for the test of magneto-electric coupled coefficient |
| CN109374093A (en) * | 2018-10-12 | 2019-02-22 | 深圳砺剑脑科学科技有限公司 | Micro weight measuring circuit |
| CN112068052A (en) * | 2020-09-15 | 2020-12-11 | 苏州大学 | High-precision multifunctional temperature-changing magnetoelectric test system |
| CN113295764A (en) * | 2021-04-12 | 2021-08-24 | 西安理工大学 | Energy conversion modeling method based on generalized magnetoelectric effect |
| CN113295764B (en) * | 2021-04-12 | 2024-03-22 | 西安理工大学 | Energy conversion modeling method based on generalized magnetoelectric effect |
| CN113687277A (en) * | 2021-10-26 | 2021-11-23 | 广东海洋大学 | Test method and system for magnetoelectric composite material sensor |
| CN113687277B (en) * | 2021-10-26 | 2022-01-25 | 广东海洋大学 | Test method and system for magnetoelectric composite material sensor |
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