CN106597329B - automatic change magnetic-electric coefficient test system - Google Patents
automatic change magnetic-electric coefficient test system Download PDFInfo
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- CN106597329B CN106597329B CN201611004867.XA CN201611004867A CN106597329B CN 106597329 B CN106597329 B CN 106597329B CN 201611004867 A CN201611004867 A CN 201611004867A CN 106597329 B CN106597329 B CN 106597329B
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- 239000010409 thin film Substances 0.000 abstract description 4
- 206010063385 Intellectualisation Diseases 0.000 abstract 1
- 239000000523 sample Substances 0.000 description 66
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 11
- 230000005690 magnetoelectric effect Effects 0.000 description 11
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- 229940060587 alpha e Drugs 0.000 description 2
- 238000009795 derivation Methods 0.000 description 2
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- 230000006355 external stress Effects 0.000 description 2
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 2
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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
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Abstract
The invention belongs to the field of material performance testing, and discloses an automatic magnetoelectric coefficient testing system. The test system includes: the device comprises a computer, a direct current bias magnetic field generation module, an alternating current magnetic field generation module, a signal detection module and a sample clamping module, wherein a sample to be detected is placed in the sample clamping module and is placed in a Helmholtz coil of the alternating current magnetic field generation module, the Helmholtz coil is placed in an electromagnet air gap of the direct current bias magnetic field generation module, the signal detection module detects an induced voltage signal of the sample to be detected and transmits the induced voltage signal to the computer, and then the required magnetoelectric coefficient is obtained by calculation in the computer. The invention realizes the test of the change rule of the medium-small sized thin-film material along with the magnitude and direction of the bias magnetic field, the magnitude and frequency of the alternating magnetic field and other factors in the alternating magnetic field above 100kHz, and simultaneously, the test system has the characteristics of intellectualization and high test precision.
Description
Technical Field
the invention belongs to the field of material performance testing, and particularly relates to an automatic magnetoelectric coefficient testing system.
background
the magnetoelectric effect is a phenomenon that some multiferroic materials induce voltage under the action of an external magnetic field or induce a magnetic field under the action of an external electric field. The application potential of materials with magnetoelectric effect in information storage and microelectronic devices such as filters, sensors, etc. has attracted the attention of researchers, and has a wide prospect in practical application. Generally, we use magnetoelectric coefficients to characterize the strength of magnetoelectric effect, i.e. the magnitude of induced magnetic field induced by unit external magnetic field or unit external electric field converted into electric polarization. The mechanism influencing the magnetoelectric effect is analyzed through the research of the magnetoelectric coefficient, so that the coupling effect of the magnetoelectric effect is improved, and the aim of wide application in practice is finally achieved. At present, the magnetoelectric effect of the composite magnetoelectric material in the materials with the magnetoelectric effect is more excellent, wherein the magnetoelectric layered composite material is particularly valued by all parties because of the advantages of convenient preparation, outstanding performance, small electric leakage and the like. The magnetoelectric effect mechanism of the magnetoelectric laminated composite material is a magnetic-force-electric multi-field coupling effect, the magnetoelectric coefficient can be expressed as alpha ME/dE/dH-dE/d sigma multiplied by d sigma/dH, a magnetic field is converted into stress strain through the magnetostriction effect of the magnetic layer, the stress strain of the magnetic layer is transmitted to the piezoelectric layer due to the mechanical coupling effect of the interlayer contact interface, and the piezoelectric layer is converted into induction voltage under the stress strain effect, so that the conversion from the magnetic field to the electric field is realized. Based on the mechanism of magnetoelectric effect, the method for testing magnetoelectric coefficient includes static method and dynamic method, wherein, the dynamic method is faster, anti-interference and more accurate, so the method is more used. The magnetoelectric coefficient test solid-state method is that under the action of a direct-current magnetic field, a perturbation alternating magnetic field is added to enable the magnetoelectric composite material to obtain the magnetoelectric coefficient under the resonance or non-resonance condition, the magnetoelectric coefficient alpha ME is dE/dH and is approximately equal to delta E/delta H, wherein delta E and delta H can be expressed by the amplitude of alternating voltage and the alternating magnetic field generated by the perturbation alternating magnetic field. At present, magnetoelectric materials available for practical use are mainly magnetoelectric composite materials, which have a large magnetoelectric coefficient and are available at normal temperature or over a wide temperature range. The measurement of magnetoelectric coefficient, which is the most important parameter of magnetoelectric materials, is an essential step for researching magnetoelectric effect.
Bracke et al in 1981 disclosed their magnetoelectric coefficient testing devices in a paper that employed a signal generator to drive a pair of Helmholtz coils to generate a uniform alternating magnetic field with a frequency of up to 100kHz, a permanent magnet to generate a bias magnetic field, and an impedance converter to collect the voltage on the magnetoelectric material; the method has the defects that the adjustment of the direct-current magnetic field is time-consuming and has large error, and the sizes of the alternating magnetic field and the bias magnetic field are not monitored in real time. In 1997, Mahesh Kumar controlled a stepping motor by a PC to adjust the change of an electromagnet, and a lock-in amplifier was used to read the output data. The lock-in amplifier improves the influence of noise of an output signal and improves the measurement precision; in 2002, Jungho Ryu and the like adopt an electromagnet driven by a power supply to replace a permanent magnet to provide a bias magnetic field, a Hall probe is used for measuring the magnitude of the bias magnetic field in real time, and a charge amplifier and an oscilloscope are used for measuring an output voltage value; in the patent of Nanzewen 2006, the computer technology and the measurement technology are combined, so that the automation of the magnetoelectric coefficient test is realized, and a probe clamping device for a test sample is improved; in 2011, Thayer and the like develop remote control systems to realize remote magnetoelectric test and data transmission; chen et al studied the law of change of the magneto-electric coefficient when stress was applied using a clamping device in which a spring presses a clamping plate in 2014. In summary, the research of the magnetoelectric coefficient tester is still in development and improvement, and the current technology still has the following defects: the existing test system still has the defects aiming at the test of the thin film composite magnetoelectric material with weaker signals and wider application, wherein the frequency of an alternating current magnetic field of most tests is within 100kHz, and the resonant frequency range of the small-sized thin-film magnetoelectric material cannot be effectively measured when the resonant frequency range is over 100kHz in the test process; the sample receives external stress in the clamping process of the sample, so that the test result is influenced to a certain extent; in addition, the magnetoelectric performance tester has larger improvement space in the aspects of automation degree, convenience in operation and use, simplicity and attractiveness of an interface, safety and reliability of data storage and the like.
disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides an automatic magnetoelectric coefficient testing system, which expands the testing frequency range of the magnetoelectric coefficient through the cooperation of a computer, a direct current bias magnetic field generating module, an alternating current magnetic field generating module, a signal detecting module and a sample clamping module, thereby solving the technical problem of testing the magnetoelectric coefficient of a more miniaturized magnetoelectric composite material.
To achieve the above object, according to one aspect of the present invention, there is provided an automated magnetic-electric coefficient testing system, the testing system including a computer, a dc bias magnetic field generating module, an ac magnetic field generating module, a signal detecting module, and a sample holding module, the automated magnetic-electric coefficient testing system including:
the direct current bias magnetic field generating module comprises a group of electromagnets, a direct current power supply and a gaussmeter, wherein the group of electromagnets are oppositely arranged and are respectively connected with the direct current power supply to obtain a direct current bias magnetic field;
The alternating current magnetic field generating module comprises a group of Helmholtz coils, an alternating current power supply and an ammeter, the Helmholtz coils, the alternating current power supply and the ammeter are connected in series to form a loop, wherein the alternating current power supply is further connected with the computer and is used for supplying alternating current to the Helmholtz coils and transmitting voltage signals of the alternating current to the computer, the Helmholtz coils are oppositely arranged and placed between air gaps of the electromagnets and are used for obtaining an alternating current magnetic field, and the ammeter is used for detecting the actual current in the alternating current magnetic field;
the signal detection module comprises a phase-locked amplifier and a universal meter, one end of the phase-locked amplifier and one end of the universal meter are connected with the sample clamping module after the phase-locked amplifier and the universal meter are connected in parallel, and the other end of the phase-locked amplifier is connected with the computer and is used for detecting the voltage value of the alternating voltage in the sample to be detected and transmitting the voltage value to the computer;
The sample clamping module is arranged between the Helmholtz coils and used for placing a sample to be tested in an alternating current magnetic field;
and the computer is used for receiving the voltage signals from the different modules and converting the signals into the required magneto-electric coefficients through calculation.
preferably, the alternating current magnetic field generation module is further connected in series with a sampling resistor, and the sampling resistor is connected with the lock-in amplifier and used for providing a reference signal for the lock-in amplifier and improving the measurement accuracy of the lock-in amplifier.
Preferably, the multimeter is a six-bit and a half-bit multimeter.
preferably, the sample clamping module comprises a sample holder, a support column and a chassis, a sample to be detected is placed on a support table of the sample holder, a lead on the sample support table is connected with the sample to be detected, and the other end of the lead is fixed on the support column and the chassis and connected with the signal detection module.
preferably, when the sample is placed in the sample holding module, the long side of the sample is placed along the direction of the bias magnetic field, and the direction of the bias magnetic field loaded on the sample can be adjusted by rotating the sample holder.
Preferably, the computer includes self-test and hardware monitoring, performance measurement, real-time display of characteristic curves and data derivation.
in general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1. compared with the prior art, the invention adopts the mode that the phase-locked amplifier and the universal meter are connected in parallel, and the frequency of an alternating current magnetic field which can be tested in the testing process reaches 300kHz by connecting the universal meters in parallel, thereby realizing the testing of the medium and small-sized thin-film materials;
2. in the invention, the magnetic field and the voltage signal of each functional module in the whole system are monitored in real time by adopting a computer, so that the whole test process is more intelligent, and the test error caused by human factors is reduced;
3. The invention contains a gaussmeter for monitoring the magnitude of a bias magnetic field, an ammeter is connected in series in an alternating magnetic field generating circuit for recording the magnitude of the alternating magnetic field in real time, and a sampling resistor in a voltage signal detection circuit provides a same-frequency signal to a phase-locked amplifier so as to obtain a voltage signal with strong anti-interference performance;
4. according to the invention, the sample to be tested is placed on the sample tray table by adopting the sample clamping module, and compared with the prior art that the sample is clamped under the action of external force, the sample provided by the invention reduces the error influence of external stress on the magneto-electric induction voltage of the sample to be tested;
5. The invention realizes the test of the change rule of the sample to be tested along with the change of the bias magnetic field, the size and the direction of the alternating magnetic field, and the like.
Drawings
FIG. 1 is a diagram of a test system hardware architecture constructed in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a sample stage of a test system constructed in accordance with a preferred embodiment of the present invention;
FIG. 3 is a workflow diagram of a computer constructed in accordance with a preferred embodiment of the present invention;
FIG. 4 is a diagram of a test interface and a body window structure of test software in a computer constructed in accordance with a preferred embodiment of the present invention;
FIG. 5 is a flow chart of a serial communication design for computer test software constructed in accordance with a preferred embodiment of the present invention;
FIG. 6 is a flow chart of a test software line graph real-time display design constructed in accordance with a preferred embodiment of the present invention;
FIG. 7 is a flow chart for exporting the excel format of test software data constructed according to the preferred embodiment of the present invention;
FIG. 8 is a graph of the variation of magnetoelectric coefficients with bias magnetic field constructed in accordance with a preferred embodiment of the present invention;
Fig. 9 is a graph of the variation of a magnetoelectric coefficient with the frequency of an alternating magnetic field constructed in accordance with a preferred embodiment of the present invention.
the same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1-direct current power supply 2-alternating current power supply 3-electromagnet 4-Helmholtz coil 5-sample clamping module 6-Gaussmeter 7-phase-locked amplifier 8-universal meter 9-ammeter 10-sampling resistor 11-USB concentrator 12-computer 13-bus bar 14-pillar 15-PCB 16-sample to be tested 17-welding spot 18-end pin header 19-sample support
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a hardware structure diagram of a test system constructed according to a preferred embodiment of the present invention; as shown in fig. 1, the system includes: computer, direct current bias magnetic field generate module, alternating current magnetic field generate module, signal detection module and sample centre gripping module, wherein:
the DC bias magnetic field generation module comprises: electro-magnet, direct current power supply and gauss meter, wherein:
The signal output end of the gauss meter is connected with the measuring signal input end of the computer;
The direct current power supply is interconnected with the computer, receives a control signal of the computer, outputs a direct current voltage signal to the computer, and simultaneously supplies power to the coil of the electromagnet by the direct current power supply box;
and the direct current power supply supplies power to the coil of the electromagnet, so that the electromagnet obtains a direct current bias magnetic field required by the computer.
The direct current bias magnetic field generation module is specifically connected and generated as follows:
adjusting the gap distance of the electromagnet to 50mm, fixing a gaussmeter probe in a uniform magnetic field area in the center of the electromagnet by using a bracket, wherein the direction of the magnetic field is vertical to the probe, and preheating the gaussmeter for 20min to achieve rated precision. And after the direct current power supply is connected with the circuit of the electromagnet, the power supply is started and the current output mode is set. Before use, the relation between the magnetic field and the current is checked to obtain a relation formula of linear change of the magnetic field with the current, wherein the relation formula is H-444.7 multiplied by I +22.5, and the fitting relation formula can be used as a reference for controlling the output of the direct current magnetic field in software writing. And after the gaussmeter is started, the output and monitoring of the direct current magnetic field part can be regulated, controlled and recorded through a computer software direct current magnetic field module.
the alternating current magnetic field generation module comprises: helmholtz coil, alternating current power supply, ampere meter, wherein:
The alternating current power supply is a driving power supply, can provide alternating current signals with the range of 0.1 Hz-200 kHz and the resolution ratio of 0.1Hz, supplies power to the Helmholtz coil, is connected with the computer, receives control signals of the computer and outputs alternating voltage signals to the computer;
the Helmholtz coil is characterized in that the size of the induction coil is 10mm in radius, 20 turns of the induction coil are used for one pair of coaxial coils, a CH-1600 digital gaussmeter is used for detecting, the relation between the central magnetic field of the Helmholtz coil and the current at 1kHz is calibrated by theoretical calculation matched with Faraday's law of electromagnetic induction, and the relation H is 1.1289I + 0.0045; the magnetic fields of the Helmholtz coils at different frequencies are calibrated by the induction coil, the reading of the ammeter is kept to be 1A, and an alternating magnetic field with the size of about 2Oe can be obtained.
the ammeter is connected in series in the alternating current magnetic field generating circuit and is used for monitoring the stability of the size of the alternating current magnetic field under different frequencies in real time;
The signal detection module is parallelly connected to form by lock-in amplifier, sampling resistor and high accuracy digital multimeter, and input between them all links to each other with sample signal output part, and the output all chooses RS232 remote interface for use to link to each other with the USB concentrator and then connects the computer, wherein:
And two input end channels of the phase-locked amplifier are respectively connected with the output end of the sample and the output end of the sampling resistor, the output end of the phase-locked amplifier is connected with a computer through a USB concentrator, and a magnetoelectric voltage signal generated by the sample is transmitted to the computer.
The sampling resistor is a power resistor of 1 omega and 20W, is used for connecting the load voltage of the sampling resistor into the reference input end of the phase-locked amplifier, provides a reference signal of the micro-voltage signal measurement part of the phase-locked amplifier, reduces noise and improves measurement precision;
the input end and the output end of the high-precision six-digit half-digital multimeter are respectively connected with the sample output end and the input end of the USB concentrator, and magnetoelectric voltage signals generated by the sample are transmitted to a computer.
a sample holding module, which is placed in the helmholtz coil at the axial position along the direction of the applied bias magnetic field, and which mainly comprises a sample holder, a support, a pillar and a bottom plate, fig. 2 is a schematic structural diagram of a sample stage of a testing system constructed according to a preferred embodiment of the present invention, as shown in fig. 2, wherein:
The sample holder is a PCB (printed Circuit Board) with the size of 16 multiplied by 10 multiplied by 2mm3, and welding points, leads and signal leading-out terminal pins at the edge for connecting sample leads are distributed on the PCB panel;
saddle, pillar and chassis are insulating, nonmagnetic plastic products, wherein:
The support platform is a cylinder with the diameter of 18mm, and a groove with the width of 10mm and the depth of 2mm is engraved on the upper surface along the diameter direction and is used for placing a sample support;
through grooves are carved on the support column along the longitudinal axis direction for placing conducting wires, and the support column is fixed with the chassis and the supporting platform through plastic screws;
the sample placing long axis is along the direction of the bias magnetic field, the position is taken as 0 degree, the rotary supporting platform can adjust the action direction of the external magnetic field on the sample by 0-360 degrees in the horizontal plane;
and the sample placing module is used for leading out a voltage signal induced by a magnetoelectric effect through a lead, is connected with the phase-locked amplifier and the high-precision digital multimeter and transmits the voltage signal to a computer for processing.
The computer includes self-test and hardware monitoring, performance measurement, real-time display of characteristic curve and data derivation, fig. 3 is a work flow chart of the computer constructed according to the preferred embodiment of the present invention, fig. 4 is a test interface chart and a main body window structure chart of test software in the computer constructed according to the preferred embodiment of the present invention, as shown in fig. 3 and 4,
Fig. 5 is a flow chart of serial port communication design of computer test software constructed according to a preferred embodiment of the present invention, as shown in fig. 5, the self-test and hardware monitoring, where the self-test mainly includes that software scans a serial port and sends version query information to a corresponding instrument, matching and checking read data with known information to determine whether the instrument is successfully communicated and give corresponding prompt information, and the hardware monitoring mainly monitors the serial port being communicated, the magnitude of a dc magnetic field, the frequency of an ac magnetic field, and the like.
And performance measurement is performed according to the change rule of the magneto-electric coefficient along with an external bias magnetic field, the change rule of the magneto-electric coefficient along with the frequency of the alternating magnetic field, the change of the magneto-electric coefficient along with the size of the alternating magnetic field and the like.
The characteristic curve real-time display is realized by a JFreechart broken line graph, which comprises a relation curve of a magneto-electric coefficient along with a direct-current magnetic field and a relation curve of the magneto-electric coefficient along with an alternating-current magnetic field frequency under a low-frequency condition, and a design flow chart is displayed in real time by a test software broken line graph constructed according to the preferred embodiment of the invention, as shown in FIG. 6.
The data export module uses jxl tool class library to store data in Excel for facilitating subsequent export, fig. 7 is a flow chart for exporting data in Excel and TXT format of test software constructed according to the preferred embodiment of the present invention, as shown in fig. 7.
The specific working process of the present invention is further explained below:
1) connecting a lead-out wire of a layered composite material sample to be tested to a fixed welding point of a PCB (printed circuit board), and fixing the PCB on a sample support to ensure that a pin header on the PCB is just embedded into a pin header on the sample support;
2) Placing a sample to be measured and a sample clamping module in an alternating current magnetic field and a direct current magnetic field together, and adjusting the sample to a to-be-measured angle which is the same as the direction of the alternating current magnetic field;
3) the computer carries out system self-check and checks whether the communication of each hardware device is normal;
The method comprises the following steps:
4) Inputting the thickness t of the piezoelectric layer in a computer, selecting the performance alpha E-Hdc of a test curve, testing the change rule of a magneto-electric coefficient along with the size of a direct current bias magnetic field Hdc, setting the size range of the test direct current bias magnetic field, controlling the current size of a direct current power supply and the check of a gaussmeter by using software to ensure that the direct current bias magnetic field provided by an electromagnet changes from small to large according to the setting, and providing an alternating current magnetic field with the size of 1kHz and 1Oe by default in the alternating current magnetic field;
5) The electromagnetic voltage signal is collected at fixed point by the phase-locked amplifier, and the computer automatically passes through the calculation formulacalculating a series of corresponding magnetoelectric coefficient values;
6) a real-time line graph display module in the computer displays a change rule curve of the magneto-electric coefficient along with the magnitude of an external bias magnetic field;
7) and (4) exporting excel data from the computer for storage so as to further analyze the change rule of the magneto-electric coefficient alpha E along with the externally-applied bias magnetic field Hdc under a certain alternating current magnetic field frequency.
The second method comprises the following steps:
4) inputting the thickness t of the piezoelectric layer in computer software, selecting the performance alpha E-fac of a test curve, testing the change rule of a magnetoelectric coefficient along with the frequency fdc of an alternating current magnetic field, setting the frequency range of the alternating current magnetic field, controlling an alternating current power supply by using the software, enabling a Helmholtz coil to generate alternating current magnetic fields with different frequencies and the same size, and controlling the current size of the direct current power supply and the verification of a gaussmeter to enable a direct current bias magnetic field with the size of a setting value provided by an electromagnet;
5) the magnetoelectric voltage signals are collected at fixed points through a phase-locked amplifier and a high-precision digital multimeter, and a computer automatically passes through a calculation formulacalculating a series of corresponding magnetoelectric coefficient values;
6) A real-time line graph display module in the computer displays a regular curve of the change of the magneto-electric coefficient along with the frequency of the alternating-current magnetic field;
7) Excel data are derived from the computer and stored so as to be further analyzed for the change rule of the magneto-electric coefficient alpha E along with the frequency fdc of the alternating current magnetic field under a certain direct current bias magnetic field.
The operation of the different testing methods of the present invention is described below by taking the Terfenol-D/PZT composite layered structure as an example.
example one: Tb-Dy-Fe alloy Terfenol-D/lead zirconate titanate PZT laminated composite magnetoelectric structure
placing a Terfenol-D/PZT composite structure on a PCB to lead out wires on electrodes on the upper surface and the lower surface of PZT, connecting the wires with corresponding welding points on the PCB, placing a sample to support the PCB, clamping the sample on a supporting platform of a sample clamping module, embedding row pins on the PCB for leading out signals into row nuts arranged along sample columns, and adjusting the direction of the supporting platform to enable the long axis of a sample to be detected to be along the direction of a bias magnetic field. Connecting and starting each device, starting computer software, carrying out self-checking on each instrument, setting the thickness t of a PZT layer, selecting a test curve type alpha E-Hdc in a magnetoelectric test module, setting a fac initial value, starting testing after setting a Hdc test range, obtaining a series of magnetoelectric voltage values by a software module through a signal detection module, drawing a real-time test curve together with an output bias magnetic field size signal through the obtained magnetoelectric coefficients, and finally deriving a test data result as shown in figure 8 according to a graph of the change relationship of the magnetoelectric coefficients along with the bias magnetic field constructed by the preferred embodiment of the invention.
example two: Tb-Dy-Fe alloy Terfenol-D/lead zirconate titanate PZT laminated composite magnetoelectric structure
Placing a Terfenol-D/PZT composite structure on a PCB to lead out wires on electrodes on the upper surface and the lower surface of PZT, connecting the wires with corresponding welding points on the PCB, placing a sample to support the PCB, clamping the sample on a supporting platform of a sample clamping module, embedding row pins on the PCB for leading out signals into row nuts arranged along sample columns, and adjusting the direction of the supporting platform to enable the long axis of a sample to be detected to be along the direction of a bias magnetic field. Connecting and starting each device, starting computer software, carrying out self-checking on each instrument, setting the thickness t of a PZT layer, selecting a test curve type alpha E-fac in a magnetoelectric test module, setting an initial value of Hdc, starting testing after setting a fac test range, obtaining a series of magnetoelectric voltage values by a software module through a signal detection module, drawing a real-time test curve together with an output alternating magnetic field frequency signal through the obtained magnetoelectric coefficients, and finally deriving a test data result as shown in FIG. 9 according to a relation graph of the change of the magnetoelectric coefficients along with the alternating magnetic field frequency, which is constructed according to the preferred embodiment of the invention.
it will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (2)
1. the utility model provides an automatic change magnetoelectric coefficient test system, this test system is used for the magnetoelectric coefficient test process of small-size miniaturized film magnetoelectric composite to including computer, direct current bias magnetic field generation module, alternating current magnetic field generation module, signal detection module and sample centre gripping module, its characterized in that:
the direct-current bias magnetic field generation module comprises a group of electromagnets, a direct-current power supply and a gaussmeter, wherein the group of electromagnets are oppositely arranged and are respectively connected with the direct-current power supply (1) for obtaining a direct-current bias magnetic field; the signal output end of the gauss meter is connected with the measuring signal input end of the computer and is used for detecting the magnitude of the direct-current bias magnetic field of the sample to be measured; the direct current power supply is interconnected with the computer, on one hand, the direct current power supply supplies power to the coils of the group of electromagnets and transmits the voltage value of the power supply voltage to the computer, and on the other hand, the direct current power supply receives a signal from the computer to realize the adjustment of the power supply voltage;
the alternating current magnetic field generating module comprises a group of Helmholtz coils (4), an alternating current power supply (2) and an ammeter (9), and the Helmholtz coils, the alternating current power supply and the ammeter are connected in series to form a loop, wherein the alternating current power supply is also connected with the computer and is used for supplying alternating current to the Helmholtz coils and transmitting voltage signals of the alternating current to the computer; the Helmholtz coils are oppositely arranged and placed between air gaps of the electromagnets to obtain an alternating-current magnetic field; the ammeter is connected in series in the alternating current magnetic field generating module and is used for monitoring the size stability of the alternating current magnetic field under different frequencies in real time;
The signal detection module is formed by connecting a phase-locked amplifier (7), a sampling resistor and a universal meter (8) in parallel, wherein two input end channels of the phase-locked amplifier are respectively connected with a sample output end and an output end of the sampling resistor, and the output end of the phase-locked amplifier is connected with the computer through a USB concentrator, so that a magnetoelectric voltage signal generated by a sample is transmitted to the computer; the sampling resistor is used for connecting the load voltage of the sampling resistor into the reference input end of the phase-locked amplifier, thereby providing a micro-voltage signal to measure the reference signal of the phase-locked amplifier; the input end and the output end of the universal meter are respectively connected with the sample output end and the input end of the USB concentrator, so that a magnetoelectric voltage signal generated by a sample is transmitted to the computer; in this way, the frequency of the alternating current magnetic field tested in the whole magnetoelectric coefficient testing process can reach 300 kHZ;
The sample clamping module (5) is arranged between the Helmholtz coils and used for placing a sample to be tested in the alternating-current magnetic field; the sample clamping module consists of a sample support, a support table, a support column and a chassis, wherein the sample support is in a PCB (printed Circuit Board) form, welding points and lead wires for connecting sample lead wires and signal leading-out end pin headers at the edges are distributed on the sample support, and the support table, the support column and the chassis are all insulating and nonmagnetic plastic products; the supporting platform is of a cylindrical structure, and a groove is carved on the upper surface of the supporting platform along the diameter direction and used for placing the sample support; the pillar is carved with a through groove along the longitudinal axis direction for placing a lead; in addition, a sample to be detected is placed on a supporting platform of the sample support, one end of a lead on the supporting platform is connected with the sample to be detected, and the other end of the lead is fixed on the supporting column and the base plate and is connected with the signal detection module; the sample is placed in a mode that the long axis of the sample is along the direction of the direct-current bias magnetic field, and the acting direction of the sample at the position can be adjusted by rotating the saddle, so that the adjusting range of 0-360 degrees in a horizontal plane is realized;
The computer (12) is used for receiving the voltage signals from the different modules and converting the signals into the required magneto-electric coefficients through calculation.
2. the automated magnetoelectric coefficient testing system according to claim 1, wherein the multimeter is a six and a half multimeter.
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| CN108562862B (en) * | 2018-06-21 | 2024-05-14 | 宁波大学 | Test piece clamping device for magneto-electric coupling coefficient test |
| CN108957048A (en) * | 2018-08-24 | 2018-12-07 | 深圳市明信测试设备有限公司 | A kind of measurement of magnetic field device |
| 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 |
| CN113156346B (en) * | 2021-03-31 | 2024-10-29 | 郑州轻工业大学 | Method for detecting parallel vortex alternating current-direct current dual-mode magnetic field by using annular magneto-electric sensor |
| CN113295764B (en) * | 2021-04-12 | 2024-03-22 | 西安理工大学 | Energy conversion modeling method based on generalized magnetoelectric effect |
| CN113687277B (en) * | 2021-10-26 | 2022-01-25 | 广东海洋大学 | Test method and system for magnetoelectric composite material sensor |
| CN114113963A (en) * | 2021-11-24 | 2022-03-01 | 昆明理工大学 | Quick decision maker of metal mineral powder material conductivity type |
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