CN103983926A - Magnetoelectric coefficient measuring method and device based on digital phase locking technology - Google Patents
Magnetoelectric coefficient measuring method and device based on digital phase locking technology Download PDFInfo
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- CN103983926A CN103983926A CN201410242194.6A CN201410242194A CN103983926A CN 103983926 A CN103983926 A CN 103983926A CN 201410242194 A CN201410242194 A CN 201410242194A CN 103983926 A CN103983926 A CN 103983926A
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Abstract
The embodiment of the invention provides a magnetoelectric coefficient measuring method and device based on a digital phase locking technology. The method includes the steps that an external magnetic field generated by rotating a strong magnet is exerted on a magnetic field modulating coil; a sample made of a magnetoelectric composite material is placed in the magnetic field modulating coil, under driving of current signals, the magnetic field modulating coil generates a modulation magnetic field, two electrodes of the sample are connected to the input end of a digital phase locking amplifier, and the digital phase locking amplifier detects voltage dV from the electrodes of the sample; the amplitude alpha of the magnetoelectric coefficient is calculated according to the voltage dV, the amplitude dH' of the modulation magnetic field, the thickness t of the sample and the formula: alpha=dV/(t*dH'). The magnetoelectric coefficient measuring method and device can measure changes, along with the magnetic field H, or the temperature T or the frequency f, of the amplitude alpha E and the phase position theta of the magnetoelectric coefficient or the real part alpha R and the imaginary part alpha X of the magnetoelectric coefficient, the measuring device adopts a magnetoelectric coefficient measuring system which is high in measuring accuracy and automation degree and complete in function, and testing requirements of various types of magnetoelectric composite material researches can be met completely.
Description
Technical field
The present invention relates to material physical property technical field of measurement and test, relate in particular to a kind of measuring method and device of the magnetic-electric coefficient based on digital lock-in technique.
Background technology
Magnetic electric compound material is composited through certain method by single-phase ferroelectric material and ferromagnetic material, and the product effect that its magnetoelectricity conversion coefficient is exactly ferroelectric phase and ferromagnetic phase produces.Due to the character of magnetic electric compound material uniqueness, magnetic electric compound material is at microwave transducer, high-precision magnetic field electric-field sensor, and microdrive, is all widely used in the devices such as phase shifter and wave filter.
Magnetoelectricity conversion coefficient dE/dH is the physical quantity of describing magnetoelectric effect size, and its unit is V/cmOe.Magnetoelectricity conversion coefficient is the important indicator of sign magnetoelectric material performance, and the magnetoelectric effect of ferroelectric-ferromagnetic compound substance is the embodiment of the product effect of two single-phase characteristic dS/dH and dE/dS, can be expressed as:
dE/dH＝K
1K
2·x(1-x)·dS/dH·dE/dS
The magnetoelectricity conversion coefficient that wherein dE/dH is compound substance; DS/dH and dE/dS are respectively the magnetostrictive effect of ferromagnetic phase and the piezoelectric effect of ferroelectric phase; X and (1-x) be respectively the volume fraction of ferromagnetic phase and ferroelectric phase in compound substance; K
1and K
2that two phase materials dilute and the attenuation coefficient of each single-phase characteristic of causing mutually.
At present, the measuring method of a kind of magnetoelectricity conversion coefficient of the prior art is: measure electric field trace dE and magnetic field trace dH, thereby indirectly measure the amplitude of magnetoelectricity conversion coefficient.
The shortcoming of the measuring method of above-mentioned magnetoelectricity conversion coefficient of the prior art is: the measurement result of the method can not reflect different hysteresis characteristics, different operating frequency, the change information of the magnetoelectricity conversion coefficient of magnetic electric compound material under coordination phase, different magnetic field, different temperatures not.
Summary of the invention
Embodiments of the invention provide a kind of measuring method and device of the magnetic-electric coefficient based on digital lock-in technique, to realize, the magnetoelectricity conversion coefficient of magnetic electric compound material are effectively measured.
The invention provides following scheme:
A measurement mechanism for magnetic-electric coefficient based on digital lock-in technique, comprising: externally-applied magnetic field generation and measurement mechanism, modulated magnetic field generation device, magnetoelectricity chromacoder and data collector;
Described externally-applied magnetic field produces and measurement mechanism, for producing externally-applied magnetic field H by rotation kicker magnet, described externally-applied magnetic field H is applied on described modulated magnetic field generation device;
Described modulated magnetic field generation device, be used for comprising magnetic field modulation coil, described magnetic field modulation coil produces modulated magnetic field under the driving of current signal, the sample that magnetic electric compound material is made is placed in described magnetic field modulation coil, two electrodes of described sample are connected to the input end of described magnetoelectricity chromacoder, the parameter of described current signal is transferred to described data collector;
Described magnetoelectricity chromacoder, be used for comprising digital lock-in amplifier, the input end of described digital lock-in amplifier connects two electrodes of described sample, and described digital lock-in amplifier detects voltage dV from the electrode of described sample, and described voltage dV is transferred to described data collector;
Described data collector, for being connected with measurement mechanism, modulated magnetic field generation device, magnetoelectricity chromacoder with described externally-applied magnetic field generation, according to the calculation of parameter of described current signal, go out the amplitude dH ' of described modulated magnetic field, according to described voltage dV, the amplitude dH of modulated magnetic field and the thickness t of described sample, calculate the amplitude alpha=dV/ (tdH ') of magnetic-electric coefficient.
Preferably, described externally-applied magnetic field generation and measurement mechanism comprises: magnet rotary corner controller, kicker magnet and gaussmeter;
Described magnet rotary corner controller, for being connected with reducing motor, controlling described reducing motor and rotates, and by described reducing motor, drives described kicker magnet to rotate;
Described kicker magnet for being arranged on the inside of described yoke, produces externally-applied magnetic field by rotating in the gap of described yoke;
Described yoke, for being applied to described externally-applied magnetic field the described modulated magnetic field generation device that is arranged on its gap;
Described gaussmeter, for measuring the size of described externally-applied magnetic field H, is transferred to described data collector by the size of described externally-applied magnetic field H.
Preferably, described data collector, also for producing according to described externally-applied magnetic field and the size of the externally-applied magnetic field H that measurement mechanism transmits, and the amplitude alpha of the magnetic-electric coefficient calculating obtains the amplitude alpha of magnetic-electric coefficient with the change curve of magnetic field H: α-H curve.
Described magnetic-electric coefficient is a complex values, wherein comprises magnetic-electric coefficient amplitude alpha
ewith magnetic-electric coefficient phase theta; Or comprise magnetic-electric coefficient real part α
rand imaginary part oc
x.
Preferably, described modulated magnetic field generation device comprises: signal generator, interchange constant-flow driver and magnetic field modulation coil;
Described signal generator, for generation of sine wave signal, using described sine wave signal Yi road as be transferred to described digital lock-in amplifier with reference to signal, another road of described sine wave signal is transferred to described magnetic field modulation coil after power amplifier amplifies, the frequency of described sine wave signal and amplitude are transferred to described data collector;
Described magnetic field modulation coil, places described sample for portion within it, produces modulated magnetic field dH ', by changing the frequency of described sine wave signal and frequency and the amplitude that amplitude changes modulated magnetic field dH ' under the driving of described sine wave signal; Two electrodes of described sample are connected to the input end of described digital lock-in amplifier;
Described interchange constant-flow driver, for adopting interchange constant current driving means to guarantee the amplitude of described modulated magnetic field dH ' and stablizing of frequency.
Preferably, described device also comprises:
Sample temperature measure and control device, for controlling the temperature T of described sample, to the processing that raises, reduces or remain unchanged of the temperature T of described sample, is transferred to described data collector by the temperature T of described sample.
Described sample temperature measure and control device comprises:
Alternating temperature sample box, sample is placed in box when by temperature variation testing, by cold air or hot gas, is blown and is made sample alternating temperature.
Temperature sensor, is PT100 or thermopair, is placed in sample below, measures the temperature in alternating temperature sample box.
Temperature detecting controller, for measure with Quality control box in temperature.
Dewar container for liquefied nitrogen, built-in hot supercharger, for generation of cold nitrogen Quality control alternating temperature.
Preferably, described data collector, also for measuring the amplitude alpha of the magnetic-electric coefficient under different temperatures T with the change curve of magnetic field H: α-H curve; Or, the in the situation that of fixing described externally-applied magnetic field H, measure the amplitude alpha of described magnetic-electric coefficient with the change curve of temperature T: α-T curve.
A measuring method for magnetic-electric coefficient based on digital lock-in technique, comprising:
By rotation kicker magnet, produce externally-applied magnetic field H, described externally-applied magnetic field H is applied on magnetic field modulation coil;
The sample that magnetic electric compound material is made is placed in described magnetic field modulation coil, and described magnetic field modulation coil produces modulated magnetic field under the driving of current signal, two electrodes of described sample is connected to the input end of digital lock-in amplifier;
Described digital lock-in amplifier detects voltage dV from the electrode of described sample;
According to the calculation of parameter of described current signal, go out the amplitude dH ' of described modulated magnetic field, according to described voltage dV, the amplitude dH ' of modulated magnetic field and the thickness t of described sample, calculate the amplitude alpha=dV/ (tdH ') of magnetic-electric coefficient.
Preferably, the described rotation kicker magnet that passes through produces externally-applied magnetic field H, and described externally-applied magnetic field H is applied on magnetic field modulation coil and is comprised:
Magnet rotary corner controller is connected with reducing motor, controls described reducing motor and rotate, described magnet rotary corner controller drives kicker magnet to rotate by described reducing motor;
Described kicker magnet is arranged on to the inside of yoke, by described kicker magnet, rotates and produce externally-applied magnetic field in the gap of described yoke;
Described yoke is applied to described externally-applied magnetic field on the described magnetic field modulation coil being arranged in its gap;
By gaussmeter, measure the size of described externally-applied magnetic field H, the size of described externally-applied magnetic field H is transferred to data collector.
Preferably, described data collector, also for producing according to described externally-applied magnetic field and the size of the externally-applied magnetic field H that measurement mechanism transmits, and the amplitude alpha of the magnetic-electric coefficient calculating obtains the amplitude alpha of magnetic-electric coefficient with the change curve of magnetic field H: α-H curve.
Preferably, the described sample that magnetic electric compound material is made is placed in described magnetic field modulation coil, described magnetic field modulation coil produces modulated magnetic field under the driving of current signal, and the input end that two electrodes of described sample is connected to digital lock-in amplifier comprises:
By signal generator, produce sine wave signal, using described sine wave signal Yi road as be transferred to described digital lock-in amplifier with reference to signal, another road of described sine wave signal is transferred to described magnetic field modulation coil after power amplifier amplifies, the frequency of described sine wave signal and amplitude are transferred to described data collector;
The sample that magnetic electric compound material is made is placed in described magnetic field modulation coil, described magnetic field modulation coil produces modulated magnetic field dH ' under the driving of described sine wave signal, by changing the frequency of described sine wave signal and frequency and the amplitude that amplitude changes modulated magnetic field dH '; Two electrodes of described sample are connected to the input end of described digital lock-in amplifier;
By exchanging constant-flow driver, adopt interchange constant current driving means to guarantee the amplitude of described modulated magnetic field dH ' and stablizing of frequency.
Preferably, described method also comprises:
By sample temperature measure and control device, control the temperature T of described sample, the temperature T of described sample is transferred to described data collector;
Preferably, described data collector is measured the amplitude alpha of the magnetic-electric coefficient under different temperatures T with the change curve of magnetic field H: α-H curve; Or, the in the situation that of fixing described externally-applied magnetic field H, measure the amplitude alpha of described magnetic-electric coefficient with the change curve of temperature T: α-T curve.
The present invention compared with prior art has following characteristics: adopt digital phase lock amplifying technology and computer data acquiring technology, and a kind of complete measuring method is provided, can measure magnetic-electric coefficient amplitude alpha
ewith phase theta or magnetic-electric coefficient real part α
rand imaginary part oc
xwith the variation of magnetic field H, temperature T or frequency f, be that a set of measuring accuracy is high, automaticity is high, and the magnetic-electric coefficient measuring system of complete function can meet the testing requirement of the research of polytype magnetic electric compound material completely.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structural drawing of the measurement mechanism of a kind of magnetic-electric coefficient based on digital lock-in technique that Fig. 1 provides for the embodiment of the present invention, in figure, 1-sample, 2-yoke, 3-magnetic field modulation coil, 4-digital lock-in amplifier, 5-gaussmeter, 6-signal generator, 7-exchanges constant-flow driver, 8-magnet rotary corner controller, 9-sample temperature measure and control device, 10-alternating temperature sample box, 11-communication line interface, 12-computing machine, 13-Dewar container for liquefied nitrogen, 14-liquid nitrogen supercharger, 15-kicker magnet, 16 reducing motors;
The magnetic electric compound material magnetoelectricity conversion coefficient of a kind of Ni/PZT/Ni structure that Fig. 2 provides for the embodiment of the present invention is with the actual measurement profile figure of changes of magnetic field;
Fig. 3 is the data acquisition control of device and the process flow diagram of data processing software of the embodiment of the present invention.
Embodiment
For ease of the understanding to the embodiment of the present invention, below in conjunction with accompanying drawing, take several specific embodiments and be further explained explanation as example, and embodiment does not form the restriction to the embodiment of the present invention.
Embodiment
Below in conjunction with principle of the present invention, structured flowchart, the specific embodiments in the embodiment of the present invention is conducted further description:
As shown in Figure 1, its composition can be divided into following components to the concrete structure of the measurement mechanism of a kind of magnetic-electric coefficient based on digital lock-in technique that the embodiment of the present invention provides:
One, externally-applied magnetic field produces and measurement mechanism, comprising: kicker magnet (15), yoke (2), magnet rotary corner controller (8) and gaussmeter (5).
Described magnet rotary corner controller, for being connected with high pulling torque reducing motor, controlling described high pulling torque reducing motor and rotates, and by described high pulling torque reducing motor, drives described kicker magnet to rotate;
Described kicker magnet, for being arranged on the inside of described yoke, changes the magnetic field in yoke gap by rotation, in yoke gap, produces externally-applied magnetic field;
Described yoke, for being applied to described externally-applied magnetic field the described modulated magnetic field generation device that is arranged on its gap;
Described gaussmeter, for measuring the size of described externally-applied magnetic field H, is transferred to described data collector by the size of described externally-applied magnetic field H.
Two, modulated magnetic field generation device, comprising: signal generator (6), interchange constant-flow driver (7) and magnetic field modulation coil (3);
Described signal generator, for generation of sine wave signal, using described sine wave signal Yi road as be transferred to described digital lock-in amplifier with reference to signal, another road of described sine wave signal is transferred to described magnetic field modulation coil after power amplifier amplifies, the parameter informations such as the frequency of described sine wave signal and amplitude are transferred to described data collector;
Described magnetic field modulation coil, places described sample for portion within it, produces modulated magnetic field dH ', by changing the frequency of described sine wave signal and frequency and the amplitude that amplitude changes modulated magnetic field dH ' under the driving of described sine wave signal; Two electrodes of described sample are connected to the input end of described digital lock-in amplifier;
Described interchange constant-flow driver, for adopting interchange constant current driving means to guarantee the amplitude of described modulated magnetic field dH ' and stablizing of frequency.
Three, magnetoelectricity chromacoder, comprise digital lock-in amplifier (4), the input end of digital lock-in amplifier connects two electrodes of described sample, and described digital lock-in amplifier detects voltage dV from the electrode of described sample, and described voltage dV is transferred to described data collector.
Four, sample temperature measure and control device, the control and the measurement that for realizing sample temperature, heat up/lower the temperature, be transferred to described data collector by the temperature T of described sample.Described sample temperature measure and control device comprises: alternating temperature sample box (10), temperature sensor (17), temperature detecting controller (9) and Dewar container for liquefied nitrogen (14).
Alternating temperature sample box, sample is placed in box when by temperature variation testing, by cold air or hot gas, is blown and is made sample alternating temperature.
Temperature sensor, is PT100 or thermopair, is placed in sample below, measures the temperature in alternating temperature sample box.
Temperature detecting controller, for measure with Quality control box in temperature.
Dewar container for liquefied nitrogen, built-in hot supercharger, for generation of cold nitrogen Quality control alternating temperature.
Five, data collector, comprise computing machine (12), by communication line interface (11), be connected with measurement mechanism, modulated magnetic field generation device, magnetoelectricity chromacoder, sample temperature measure and control device with described externally-applied magnetic field generation, according to parameter informations such as the frequency of the sine wave signal of described current signal and amplitudes, calculate the amplitude dH ' of described modulated magnetic field, according to described voltage dV, the amplitude dH of modulated magnetic field and the thickness t of described sample, calculate the amplitude alpha=dV/ (tdH ') of magnetic-electric coefficient.
Also for producing according to described externally-applied magnetic field and the size of the externally-applied magnetic field H that measurement mechanism transmits, and the amplitude alpha of the magnetic-electric coefficient calculating obtains the amplitude alpha of magnetic-electric coefficient with the change curve of magnetic field H: α-H curve.The amplitude alpha of the magnetoelectricity conversion coefficient of the magnetic electric compound material of a kind of Ni/PZT/Ni structure that Fig. 2 provides for the embodiment of the present invention is with the actual measurement profile figure of magnetic field H.
Also for measuring the amplitude alpha of the magnetic-electric coefficient under different temperatures T with the change curve of magnetic field H: α-H curve; Or, the in the situation that of fixing described externally-applied magnetic field H, measure the amplitude alpha of described magnetic-electric coefficient with the change curve of temperature T: α-T curve.
The data acquisition control of the device of the embodiment of the present invention and the process flow diagram of data processing software are as shown in Figure 3, concrete processing procedure comprises: all equipment connecting by USB interface (11), by computer software control, can be measured the magnetic-electric coefficient of magnetic electric compound material automatically with the change information in magnetic field; Magnetic-electric coefficient is with the change information of frequency; Magnetic-electric coefficient variation with temperature information, and can obtain magnetic hysteresis information in magnetoelectric material etc.
Data acquisition control and data processing software are to adopt Visual Basic language compilation, and program operating procedure is as follows: the first step: program is carried out initialization to each instrument port and parameter.Second: the variation range of selecting data acquisition scheme α-H or α-T or α-f and magnetic field H, temperature T or frequency f.The 3rd step: software regulates and controls according to variation range and the rate of change of magnetic field H, temperature T and the frequency f set the variation that corresponding equipment carries out magnetic field H, temperature T and frequency f, lock-in amplifier starts to measure magnetic-electric coefficient, and software collects computing machine by each port numerical value.In data acquisition, data point and each instrument state information are presented on software interface in real time.The 4th step: can carry out smoothly data after data acquisition completes, difference quotient, integration, symmetry data processing and some calculation of parameter.After satisfaction, can to file or software interface curve sectional drawing, preserve or print by save data.The 5th step: replacing sample or change instrument parameter remeasure.
Below concrete test process:
1) sample is placed on to the input end that two electrodes of ferroelectric material in magnetic field modulation coil are received digital lock-in amplifier; Sample box and magnetic field modulation coil are placed in yoke gap.
2) log-on data acquisition software, selects or adjusts sinusoidal wave frequency, the amplitude that signal generator produces, the drive current of Modulating Power amplifier.
3) select variation range and the rate of change of data acquisition scheme α-H or α-T or α-f and magnetic field H, temperature T or frequency f.
4) click START button and start data acquisition, program can be according to the parameter and the data acquisition scheme automatic data collection that arrange.
5) data acquisition can be carried out the processing such as data smoothing, difference quotient, integration and calculation of parameter after finishing to data, finally saves as data file.
6) change sample or change 3 to the 5 continuation measurements of parameter repeating step.
In sum, the embodiment of the present invention compared with prior art has following characteristics: adopt digital phase lock amplifying technology and computer data acquiring technology, and a kind of complete measuring method is provided, can measure magnetic-electric coefficient amplitude alpha
ewith phase theta or magnetic-electric coefficient real part α
rand imaginary part oc
xwith the variation of magnetic field H, temperature T or frequency f, be that a set of measuring accuracy is high, automaticity is high, and the magnetic-electric coefficient measuring system of complete function can meet the testing requirement of the research of polytype magnetic electric compound material completely.
The measurement result of the embodiment of the present invention can reflect different magnetic hysteresis, different operating frequency, the change information of the magnetoelectricity conversion coefficient of magnetic electric compound material under coordination phase, different magnetic field, different temperatures not.
The embodiment of the present invention is by one of ordinary skill in the art will appreciate that: accompanying drawing is the schematic diagram of an embodiment, and the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually referring to, each embodiment stresses is the difference with other embodiment.Especially, for device or system embodiment, because it is substantially similar in appearance to embodiment of the method, so describe fairly simplely, relevant part is referring to the part explanation of embodiment of the method.Apparatus and system embodiment described above is only that schematically those of ordinary skills, in the situation that not paying creative work, are appreciated that and implement.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (13)
1. a measurement mechanism for the magnetic-electric coefficient based on digital lock-in technique, is characterized in that, comprising: externally-applied magnetic field generation and measurement mechanism, modulated magnetic field generation device, magnetoelectricity chromacoder and data collector;
Described externally-applied magnetic field produces and measurement mechanism, for producing externally-applied magnetic field H by rotation kicker magnet, described externally-applied magnetic field H is applied on described modulated magnetic field generation device;
Described modulated magnetic field generation device, be used for comprising magnetic field modulation coil, described magnetic field modulation coil produces modulated magnetic field under the driving of current signal, the sample that magnetic electric compound material is made is placed in described magnetic field modulation coil, two electrodes of described sample are connected to the input end of described magnetoelectricity chromacoder, the parameter of described current signal is transferred to described data collector;
Described magnetoelectricity chromacoder, be used for comprising digital lock-in amplifier, the input end of described digital lock-in amplifier connects two electrodes of described sample, and described digital lock-in amplifier detects voltage dV from the electrode of described sample, and described voltage dV is transferred to described data collector;
Described data collector, for being connected with measurement mechanism, modulated magnetic field generation device, magnetoelectricity chromacoder with described externally-applied magnetic field generation, according to the calculation of parameter of described current signal, go out the amplitude dH ' of described modulated magnetic field, according to described voltage dV, the amplitude dH of modulated magnetic field and the thickness t of described sample, calculate the amplitude alpha=dV/ (tdH ') of magnetic-electric coefficient.
2. the measurement mechanism of the magnetic-electric coefficient based on digital lock-in technique according to claim 1, is characterized in that, described externally-applied magnetic field produces and measurement mechanism comprises: magnet rotary corner controller, kicker magnet and gaussmeter,
Described magnet rotary corner controller, for being connected with reducing motor, controlling described reducing motor and rotates, and by described reducing motor, drives described kicker magnet to rotate;
Described kicker magnet for being arranged on the inside of described yoke, produces externally-applied magnetic field by rotating in the gap of described yoke;
Described yoke, for being applied to described externally-applied magnetic field the described modulated magnetic field generation device that is arranged on its gap;
Gaussmeter, for measuring the size of described externally-applied magnetic field H, is transferred to described data collector by the size of described externally-applied magnetic field H.
3. the measurement mechanism of the magnetic-electric coefficient based on digital lock-in technique according to claim 2, is characterized in that:
Described data collector, for producing according to described externally-applied magnetic field and the size of the externally-applied magnetic field H that measurement mechanism transmits, and the amplitude alpha of the magnetic-electric coefficient the calculating amplitude alpha that obtains magnetic-electric coefficient is α-H curve with the change curve of magnetic field H.
4. the measurement mechanism of the magnetic-electric coefficient based on digital lock-in technique according to claim 2, is characterized in that, described magnetic-electric coefficient is a complex values, wherein comprises magnetic-electric coefficient amplitude alpha
ewith magnetic-electric coefficient phase theta; Or comprise magnetic-electric coefficient real part α
rand imaginary part oc
x.
5. the measurement mechanism of the magnetic-electric coefficient based on digital lock-in technique according to claim 1, is characterized in that, described modulated magnetic field generation device comprises: signal generator, interchange constant-flow driver and magnetic field modulation coil,
Described signal generator, for generation of sine wave signal, using described sine wave signal Yi road as be transferred to described digital lock-in amplifier with reference to signal, another road of described sine wave signal is transferred to described magnetic field modulation coil after power amplifier amplifies, the frequency of described sine wave signal and amplitude are transferred to described data collector;
Described magnetic field modulation coil, places described sample for portion within it, produces modulated magnetic field dH ', by changing the frequency of described sine wave signal and frequency and the amplitude that amplitude changes modulated magnetic field dH ' under the driving of described sine wave signal; Two electrodes of described sample are connected to the input end of described digital lock-in amplifier;
Described interchange constant-flow driver, for adopting interchange constant-current drive technology to guarantee the amplitude of described modulated magnetic field dH ' and stablizing of frequency.
6. according to the measurement mechanism of the magnetic-electric coefficient based on digital lock-in technique described in claim 1 to 5 any one, it is characterized in that, described device also comprises:
Sample temperature measure and control device, for controlling the temperature T of described sample, to the processing that raises, reduces or remain unchanged of the temperature T of described sample, is transferred to described data collector by the temperature T of described sample.
7. the measurement mechanism of the magnetic-electric coefficient based on digital lock-in technique according to claim 6, is characterized in that, described sample temperature measure and control device comprises:
Alternating temperature sample box, sample is placed in box when by temperature variation testing, by cold air or hot gas, is blown and is made sample alternating temperature;
Temperature sensor, is PT100 or thermopair, is placed in sample below, measures the temperature in alternating temperature sample box;
Temperature detecting controller, for measure with Quality control box in temperature.
Dewar container for liquefied nitrogen, built-in hot supercharger, for generation of cold nitrogen Quality control alternating temperature.
8. the measurement mechanism of the magnetic-electric coefficient based on digital lock-in technique according to claim 6, is characterized in that:
Described data collector, also can be used for measuring the amplitude alpha of the magnetic-electric coefficient under different temperatures T with the change curve of magnetic field H: α-H curve; Or, the in the situation that of fixing described externally-applied magnetic field H, measure the amplitude alpha of described magnetic-electric coefficient with the change curve of temperature T: α-T curve.
9. a measuring method for the magnetic-electric coefficient based on digital lock-in technique, is characterized in that, comprising:
By rotation kicker magnet, produce externally-applied magnetic field H, described externally-applied magnetic field H is applied on magnetic field modulation coil;
The sample that magnetic electric compound material is made is placed in described magnetic field modulation coil, and described magnetic field modulation coil produces modulated magnetic field under the driving of current signal, two electrodes of described sample is connected to the input end of digital lock-in amplifier;
Described digital lock-in amplifier detects voltage dV from the electrode of described sample;
According to the calculation of parameter of described current signal, go out the amplitude dH ' of described modulated magnetic field, according to described voltage dV, the amplitude dH ' of modulated magnetic field and the thickness t of described sample, calculate the amplitude alpha=dV/ (tdH ') of magnetic-electric coefficient.
10. the measuring method of the magnetic-electric coefficient based on digital lock-in technique according to claim 9, is characterized in that, the described rotation kicker magnet that passes through produces externally-applied magnetic field H, and described externally-applied magnetic field H is applied on magnetic field modulation coil and is comprised:
Magnet rotary corner controller is connected with reducing motor, controls described reducing motor and rotate, described magnet rotary corner controller drives kicker magnet to rotate by described reducing motor;
Described kicker magnet is arranged on to the inside of yoke, by described kicker magnet, rotates and produce externally-applied magnetic field in the gap of described yoke;
Described yoke is applied to described externally-applied magnetic field on the described magnetic field modulation coil being arranged in its gap;
By gaussmeter, measure the size of described externally-applied magnetic field H, the size of described externally-applied magnetic field H is transferred to data collector.
The measuring method of 11. magnetic-electric coefficient based on digital lock-in technique according to claim 10, is characterized in that:
Described data collector, also for producing according to described externally-applied magnetic field and the size of the externally-applied magnetic field H that measurement mechanism transmits, and the amplitude alpha of the magnetic-electric coefficient calculating obtains the amplitude alpha of magnetic-electric coefficient with the change curve of magnetic field H: α-H curve.
The measuring method of 12. magnetic-electric coefficient based on digital lock-in technique according to claim 9, it is characterized in that, the described sample that magnetic electric compound material is made is placed in described magnetic field modulation coil, described magnetic field modulation coil produces modulated magnetic field under the driving of current signal, and the input end that two electrodes of described sample is connected to digital lock-in amplifier comprises:
By signal generator, produce sine wave signal, using described sine wave signal Yi road as be transferred to described digital lock-in amplifier with reference to signal, another road of described sine wave signal is transferred to described magnetic field modulation coil after power amplifier amplifies, the frequency of described sine wave signal and amplitude are transferred to described data collector;
The sample that magnetic electric compound material is made is placed in described magnetic field modulation coil, described magnetic field modulation coil produces modulated magnetic field dH ' under the driving of described sine wave signal, by changing the frequency of described sine wave signal and frequency and the amplitude that amplitude changes modulated magnetic field dH '; Two electrodes of described sample are connected to the input end of described digital lock-in amplifier;
By exchanging constant-flow driver, adopt interchange constant-current drive technology to guarantee the amplitude of described modulated magnetic field dH ' and stablizing of frequency.
13. according to the measuring method of the magnetic-electric coefficient based on digital lock-in technique described in claim 9 to 12 any one, it is characterized in that, described method also comprises:
By sample temperature measure and control device, control the temperature T of described sample, the temperature T of described sample is transferred to described data collector;
Described data collector is measured the amplitude alpha of the magnetic-electric coefficient under different temperatures T with the change curve of magnetic field H: α-H curve; Or, the in the situation that of fixing described externally-applied magnetic field H, measure the amplitude alpha of described magnetic-electric coefficient with the change curve of temperature T: α-T curve.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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