CN112327225A - Magnetic field detection method based on magneto-dielectric effect, test device and working method thereof - Google Patents
Magnetic field detection method based on magneto-dielectric effect, test device and working method thereof Download PDFInfo
- Publication number
- CN112327225A CN112327225A CN202011223082.8A CN202011223082A CN112327225A CN 112327225 A CN112327225 A CN 112327225A CN 202011223082 A CN202011223082 A CN 202011223082A CN 112327225 A CN112327225 A CN 112327225A
- Authority
- CN
- China
- Prior art keywords
- magnetic field
- material layer
- piezoelectric ceramic
- ceramic material
- composite structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 129
- 230000000694 effects Effects 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000012360 testing method Methods 0.000 title claims abstract description 14
- 239000002131 composite material Substances 0.000 claims abstract description 59
- 239000000463 material Substances 0.000 claims abstract description 48
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 46
- 230000035945 sensitivity Effects 0.000 claims abstract description 14
- 238000001228 spectrum Methods 0.000 claims abstract description 4
- 230000009471 action Effects 0.000 claims description 9
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical group [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 claims description 9
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 229910001053 Nickel-zinc ferrite Inorganic materials 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 4
- 238000012512 characterization method Methods 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 abstract description 5
- 230000006698 induction Effects 0.000 abstract description 5
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 4
- 230000005284 excitation Effects 0.000 abstract description 3
- 238000013329 compounding Methods 0.000 abstract description 2
- 238000009812 interlayer coupling reaction Methods 0.000 abstract description 2
- 238000010030 laminating Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract description 2
- 229910052596 spinel Inorganic materials 0.000 abstract description 2
- 239000011029 spinel Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 65
- 230000008859 change Effects 0.000 description 9
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 7
- 229910052709 silver Inorganic materials 0.000 description 7
- 239000004332 silver Substances 0.000 description 7
- 230000005674 electromagnetic induction Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 230000005355 Hall effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001404 mediated effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000005668 Josephson effect Effects 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/063—Magneto-impedance sensors; Nanocristallin sensors
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Nanotechnology (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The invention provides a method for detecting a magnetic field based on a magneto-dielectric effect, a test device and a working method thereof, and the method comprises a magneto-electric composite detection structure, wherein the magneto-electric composite detection structure is formed by laminating and compounding spinel ferrite and piezoelectric ceramic, an alternating magnetic field to be detected generates mechanical strain with the same frequency as excitation after being captured by a ferrite material, the mechanical strain is transmitted to the piezoelectric ceramic material through interlayer coupling, and finally the mechanical strain is output in a capacitance signal mode to realize detection of the alternating magnetic field, and an impedance analyzer is utilized to scan a capacitance spectrum of the magneto-electric composite detection structure to complete measurement of typical sensing parameters such as sensitivity, resolution and the like of a magnetic sensor device. Compared with the traditional electromagnetic sensor induction detection mode, the invention gets rid of the limitation of an external bias magnetic field, improves the detection sensitivity, is not easily interfered by an external power frequency signal, has stronger signal-to-noise ratio and is more compact in the whole device.
Description
Technical Field
The invention relates to the technical field of alternating-current magnetic field methods, in particular to a method for detecting a magnetic field based on a magneto-dielectric effect, a test device and a working method thereof.
Background
Since 1831 the English man Michael Faraday discovered the electromagnetic induction law, people have been exploring and researching the magnetic field more and more deeply. In the fields of traditional industrial application and modification, resource exploration and comprehensive utilization, environmental protection, bioengineering, traffic intelligent control and the like, the magnetic sensor plays an irreplaceable role. The advantages of magnetic sensing technology in robot and factory automation are particularly evident, and the more common applications include detecting fuel gauges of automobile fuel tank floats and magnetic sensing devices for detecting the position of brushless motor rotors. Meanwhile, various magnetic sensors play unique roles in various fields due to different sensing principles.
The principles of magnetic field detection in common use can be roughly divided into faraday electromagnetic induction effect, hall effect, giant magnetoresistance effect, josephson effect, magnetostrictive effect, etc., and the operational response characteristics of these magnetic sensors are often limited by their inherent physical limits. For example, the simplest magnetically sensitive element is an electromagnetic induction magnetic sensor with a single coil structure, and the electromagnetic induction magnetic sensor cannot measure a static magnetic field due to the restriction of the inherent electromagnetic induction principle. The most commonly used hall element in the industrial field is an active device, and an extra loading electric field is needed to excite the strong hall effect during actual deployment, so that the application flexibility is limited. The magnetic field detection element with the highest sensitivity so far is a superconducting quantum interferometer for capturing a minute magnetic flux by using a Joseph junction, and the detection sensitivity thereof is as high as 10 at an excitation frequency of 1Hz-15T/√ Hz, but only at low temperature (about 4K), is obtained in a complete set of instrumentsThe manufacturing cost of (2) is relatively high. In summary, it is known that different physical principles determine the application field and range of the magnetic sensor, and the essence of widening the application field lies in the proposing a new magnetic field detection method. Therefore, a magnetic sensor device that breaks through the limitations of the conventional principles and has the outstanding advantages of being passive, highly sensitive, compact, etc. at room temperature is needed.
Disclosure of Invention
Aiming at the technical problems that the current magnetoelectric induction type sensor with a coil structure has more limitations and the manufacturing cost is relatively high, the invention provides a method for detecting a magnetic field based on a magneto-dielectric effect, a test device and a working method thereof.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a method for detecting a magnetic field based on a magneto-dielectric effect comprises the following steps:
s1, keeping the magnetoelectric composite structure detector consistent with the direction of a magnetic field to be detected along the length direction, wherein the magnetoelectric composite structure detector comprises two magnetostrictive material layers and a piezoelectric ceramic material layer, the length of the piezoelectric ceramic material layer is greater than that of the magnetostrictive material layer, the two magnetostrictive material layers are respectively positioned at two sides of the piezoelectric ceramic material layer, and two leads are led out from an upper polar plate and a lower polar plate of the piezoelectric ceramic material layer to serve as signal output ports;
s2, when detecting an alternating current magnetic field, the magnetostrictive material layer generates magnetostrictive strain under the action of the alternating current magnetic field to generate mechanical vibration, and the magnetostrictive material layer transmits the strain generated by the mechanical vibration to the piezoelectric ceramic material layer;
s3, when the piezoelectric ceramic material layer is subjected to the strain action of the magnetostrictive material layer, the dielectric constant of the piezoelectric ceramic material layer changes, the piezoelectric ceramic material layer outputs a changed capacitance value through the lead, and the alternating current magnetic field is detected through the changed capacitance value.
The utility model provides a test device based on magnetic dielectric effect surveys magnetic field, includes signal generator, alternating current coil, magnetoelectric composite structure detector and impedance analysis appearance, and alternating current coil twines on magnetoelectric composite structure detector, and the alternating current coil both ends all are connected with signal generator, and magnetoelectric composite structure detector is connected with impedance analysis appearance.
Preferably, the magnetoelectric composite structure detector comprises two magnetostrictive material layers and a piezoelectric ceramic material layer, the two magnetostrictive material layers are respectively positioned on two sides of the piezoelectric ceramic material layer, and two leads led out from an upper polar plate and a lower polar plate of the piezoelectric ceramic material layer are both connected with the impedance analyzer; the magnetostrictive material layer and each layer of the piezoelectric ceramic material layer are bonded by epoxy resin glue to form an M-P-M sandwich structure.
Preferably, the magnetostrictive material layer is a terbium-doped nickel zinc ferrite material, and the piezoelectric ceramic material layer is a PZT-8 piezoelectric ceramic material.
The working method of the test device for detecting the magnetic field based on the magneto-dielectric effect comprises the following steps:
a1, applying high-frequency current to the alternating current coil through a signal generator to form a high-frequency alternating current magnetic field as a magnetic field to be measured;
a2, adjusting a signal generator to obtain alternating current magnetic fields with different frequencies and different amplitudes respectively, and scanning a capacitance spectrum of an output port of the magnetic field composite structure detector through an impedance analyzer to realize the representation of the alternating current magnetic field composite structure detector under fixed frequency or fixed amplitude;
a3, according to the step A2, under a certain frequency, the output amplitude of the signal generator is stepped, the capacitance amplitude of the output port of the scanning magnetic field composite structure detector changes along with the amplitude of the magnetic field, and the dependence characteristic of the capacitance along with the magnetic field, namely the sensitivity of the magnetic field-capacitance is obtained;
a4, according to the step A2, in the low magnetic field amplitude range, the lowest threshold magnetic field amplitude is taken as the signal output step, and the jump curve of the capacitance along with the threshold magnetic field, namely the magnetic field resolution, is obtained;
a5, according to the step A2, under the condition that the input magnetic field is kept stable, the magnetic field composite structure detector keeps the working state for a long time, and the output capacitance stability characteristic is obtained.
Compared with the prior art, the invention has the beneficial effects that:
1. the magnetoelectric composite structure detector is a strain-mediated multilayer heterogeneous block structure, a magnetostrictive material adopted in the magnetoelectric composite structure detector is terbium-doped nickel-zinc ferrite, the magnetodielectric effect is based on the magnetostrictive effect of the ferromagnetic material and the piezoelectric effect of the piezoelectric material, and strong magnetoelectric coupling is realized through interlayer strain transfer, so that the function of converting magnetic field intensity-capacitance is realized; and the volume of the device is further reduced, and the device has the advantages of simple preparation process, low cost, high magnetic field detection sensitivity, strong movement flexibility and the like, and has high potential application value in the field of small-range weak magnetic field detection.
2. The test device has a simple circuit structure, the magnetoelectric composite structure detector captures an alternating current magnetic field to be tested through a high-permeability magnetostrictive material in the magnetoelectric composite material, converts the alternating current magnetic field into a change quantity of capacitance through a magnetic dielectric effect and outputs the change quantity through a piezoelectric phase, so that the conversion of the magnetic field intensity and an electric signal is realized, the detection function of the alternating current magnetic field is realized, the sensitivity of the magnetoelectric composite structure detector is 5.656nF/Oe, the maximum resolution is 100mOe, and the confidence acquisition probability is 99% and the uncertainty is approximately 1.01% under the 2h working state; compared with the traditional magnetoelectric induction type detection mode, the novel alternating current magnetic field detection mode not only has the advantages of high resolution, high sensitivity and the like, but also greatly saves the space when the magnetoelectric composite structure replaces the traditional magnetoelectric composite structure of the induction coil to capture the magnetic field to be detected, and has higher potential application value under the miniaturization trend of devices.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a magnetoelectric composite structure detector in the invention.
FIG. 2 is a schematic diagram of a system for detecting an AC magnetic field using magneto-dielectric effect according to the present invention.
Fig. 3 is a graph showing the relationship between the change of the output capacitance of the magnetoelectric composite structure detector and the change of the input magnetic field.
Fig. 4 is a step curve diagram of the jump of the output capacitance of the magnetoelectric composite structure detector along with the minimum input magnetic field.
Fig. 5 is a statistical histogram of the output capacitance fluctuation curve and the scatter distribution of the magnetoelectric composite structure detector in a long-time working state.
In the figure, 1 is a magnetostrictive material layer, 2 is a piezoelectric ceramic material layer, and 3 is an ac coil.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1: as shown in fig. 1, a method for detecting a magnetic field based on a magneto-dielectric effect includes the following steps:
s1, keeping the magnetoelectric composite structure detector consistent with the direction of a magnetic field to be detected along the length direction, enabling the magnetoelectric composite structure detector to be a magnetoelectric composite structure formed by laminating and compounding spinel ferrite and piezoelectric ceramics, generating same-frequency mechanical strain after an alternating magnetic field to be detected is captured by the ferrite material, then transmitting the same-frequency mechanical strain to the piezoelectric ceramics through interlayer coupling, and finally outputting the same in a capacitance signal mode to realize detection of the alternating magnetic field.
The magnetoelectric composite structure detector is a sandwich-type three-layer structure and comprises an upper layer of magnetostrictive material, a lower layer of magnetostrictive material and a middle single-layer piezoceramic material, wherein the two layers of magnetismThe electrostrictive material layers are respectively positioned at two sides of the piezoelectric ceramic material layer, the thicknesses of the magnetostrictive material and the piezoelectric ceramic material layer are the same, the piezoelectric ceramic material of the middle layer is PZT-8, the length, the width and the height of the piezoelectric ceramic material are respectively 40mm, 4mm and 0.5mm, and the upper surface and the lower surface of the PZT-8 are covered with silver electrodes; when x =0, the upper and lower layers of magnetostrictive material is Ni0.8Zn0.2Tb0.02Fe1.98O4The length, width and height of the piezoelectric ceramic material layer are respectively 35mm, 4mm and 0.5mm, the length of the inner-layer piezoelectric material layer is slightly longer than that of the outer-layer magnetostrictive material layer, so that silver electrodes can be led out from the upper surface and the lower surface of PZT-8, two leads are led out from the upper polar plate and the lower polar plate of the piezoelectric ceramic material layer to serve as signal output ports, a coil is a copper enameled wire, and the piezoelectric ceramic material layer 2 and the magnetostrictive material layer 1 are bonded by epoxy resin glue;
the preparation method of the magnetoelectric composite structure comprises the following steps: (1) ni of the above size to be cut0.8Zn0.2Tb0.02Fe1.98O4Polishing the thin sheet by using No. 600 fine sand paper, removing a surface oxide layer, and cleaning the thin sheet by using acetone; (2) and uniformly sputtering a silver electrode with the thickness of 30 mu m on the surface of the PZT-8 piezoelectric ceramic thin layer by using an ultra-vacuum magnetron sputtering machine. (3) Leading out a silver electrode of PZT-8, uniformly coating a copper enameled wire and the surface of the silver electrode by using a conductive adhesive, placing the copper enameled wire and the surface of the silver electrode into a constant temperature box at 80 ℃, standing for 4 hours, taking out, and naturally cooling to room temperature for later use; (4) PZT-8 and Ni to be led out of silver electrode0.8Zn0.2Tb0.02Fe1.98O4The slice is put into a constant temperature box of 120 ℃ and baked for 2 hours after being laminated and bonded by epoxy resin glue, and then the M-P-M three-layer magnetoelectric composite structure is manufactured.
S2, when an alternating current magnetic field is detected, the magnetostrictive material layer generates magnetostrictive strain under the action of the alternating magnetic field to generate mechanical vibration, the magnetostrictive material layer transmits the strain generated by the mechanical vibration to the piezoelectric ceramic material layer, namely, the magnetostrictive layer deflects an internal magnetic domain under the action of the alternating magnetic field to generate magnetostrictive strain, the magnetostrictive strain is expressed as mechanical vibration depending on the frequency of the alternating current magnetic field, and the magnetostrictive strain is transmitted to the piezoelectric layer under the action of interlayer strain coupling.
S3, when the piezoelectric ceramic material layer is under the strain action of the magnetostrictive material layer, the dielectric constant of the piezoelectric ceramic material layer changes, and then the piezoelectric ceramic material layer outputs a changed capacitance value through a lead, the alternating current magnetic field detection is realized through the changed capacitance value, namely when the piezoelectric ceramic is under the strain action of external stress, the positive and negative charge centers of the unit cell are not superposed, the electric polarization phenomenon is generated inside, the polarization and dipole defects of space charge contribute to the dielectric constant, therefore, the dielectric constant changes along with the mechanical vibration of the device, and through magnetic dielectric coupling, the dependency relationship of the dielectric constant along with the change of the magnetic field is shown, and the change amount of the magnetic field is further represented by the parallel plate capacitance.
Example 2: as shown in fig. 2, a test device for detecting a magnetic field based on a magneto-dielectric effect includes a signal generator, an ac coil, a detector with a magneto-electric composite structure and an impedance analyzer, the ac coil 3 is wound on the detector with the magneto-electric composite structure, two ends of the ac coil 3 are connected with the signal generator, the detector with the magneto-electric composite structure is connected with the impedance analyzer, the detector with the magneto-electric composite structure is a strain-mediated multilayer heterostructure block structure, and the detector with the magneto-electric composite structure is a Ni-based detector0.8Zn0.2Tb0.02Fe1.98O4-PZT-Ni0.8Zn0.2Tb0.02Fe1.98O4The magnetoelectric composite structure detector comprises two layers of terbium-doped nickel-zinc ferrite magnetostrictive materials and a layer of PZT-8 piezoelectric ceramic material, the two layers of magnetostrictive materials are respectively positioned on two sides of the piezoelectric ceramic material layer, the magnetostrictive material layer and each layer of the piezoelectric ceramic material layer are bonded into an M-P-M sandwich structure by epoxy resin adhesive, and two leads are led out from the upper and lower polar plates of the piezoelectric ceramic material layer and are connected with an impedance analyzer.
The signal generator provides a fixed-frequency alternating current signal for the coil, so that the coil generates an alternating current magnetic field to serve as a to-be-detected end of the alternating current magnetic field detection device; two leads led out from the upper surface and the lower surface of a piezoceramic material of the magnetoelectric composite structure detector are used as output ports to form a loop with a capacitance measuring circuit, and the magneto-dielectric effect is to capture an alternating current magnetic field to be measured through a magneto-extension phase in the magnetoelectric composite structure and convert the alternating current magnetic field into a change quantity of capacitance through a magnetoelectric coupling effect to be output through the piezoceramic material.
Example 3: as shown in fig. 3 to 5, the working method of the test device for detecting a magnetic field based on the magneto-dielectric effect is characterized by comprising the following steps:
a1, applying high-frequency current to an alternating current coil through a signal generator to form a high-frequency alternating current magnetic field as a magnetic field to be detected, sensing the magnetic field generated by the coil and generating strain force along the length direction by a magnetostrictive layer in the magnetoelectric composite structure detector, leading the transmitted stress to act on a piezoelectric ceramic material layer through interface coupling, changing the dielectric constant of the piezoelectric material, leading two leads out capacitance signals from an upper polar plate and a lower polar plate of the piezoelectric material, wherein the capacitance signals are in direct proportion to the dielectric constant of the piezoelectric material, and the direct magnetodielectric effect enables the magnetoelectric composite structure to realize magnetic-electric conversion and finally realize the detection of the alternating current magnetic field;
a2, adjusting a signal generator to respectively obtain alternating current magnetic fields with different frequencies and different amplitudes, and scanning a capacitance spectrum of an output port of the magnetic field composite structure detector through an impedance analyzer to realize the characterization of the alternating current magnetic field composite structure detector under different conditions;
a3, according to the step A2, under a certain frequency, the output amplitude of the signal generator is stepped, the capacitance amplitude of the output port of the scanning magnetic field composite structure detector changes along with the magnetic field amplitude, the obtained capacitance-to-magnetic field dependence characteristic, namely the magnetic-capacitance sensitivity, is the ratio of the magnetic field intensity to be detected to the output capacitance, namely the sensitivity of the magnetoelectric composite structure detector, as shown in figure 3, the dependence condition of the magnetic field intensity to be detected to the output capacitance is described, a C-H curve in a linear relation is drawn, and good sensitivity is shown;
a4, according to the step A2, in the low magnetic field amplitude range, the lowest threshold magnetic field amplitude is taken as the signal output step, and the jump curve of the capacitance along with the threshold magnetic field, namely the magnetic field resolution, is obtained; for the resolution characterization of the alternating current magnetic field detector, fig. 4 quantifies the magnetic field resolution of the magnetoelectric composite structure, shows the change of the output capacitance when the alternating current magnetic field changes in step at a specific frequency, and the sensor can accurately measure the step change of 100mOe at the resonant frequency;
a5, according to the step A2, under the condition that the input magnetic field is kept stable, the magnetic field composite structure detector keeps the working state for a long time, as shown in figure 5, and the output capacitance stability characteristic is obtained; under the excitation of an alternating current magnetic field with the same natural resonant frequency as that of the magnetoelectric composite structure, the accurate measurement of a 100mOe step alternating current magnetic field is finally realized, the sensitivity reaches more than 5.656nF/Oe, and the alternating current magnetic field detection device utilizes the magneto-dielectric effect stably for a long time; compared with the traditional electromagnetic induction detection mode which utilizes coil coupling, the novel mode which utilizes the magneto-dielectric effect to detect the alternating-current magnetic field not only has the advantages of high resolution, good sensitivity and the like, but also greatly saves the space when the magnetoelectric composite structure replaces the traditional magnetoelectric composite structure of the induction coil to capture the magnetic field to be detected, and has higher potential application value under the miniaturization trend of devices.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A method for detecting a magnetic field based on a magneto-dielectric effect is characterized by comprising the following steps:
s1, keeping the magnetoelectric composite structure detector consistent with the direction of a magnetic field to be detected along the length direction, wherein the magnetoelectric composite structure detector comprises two magnetostrictive material layers and a piezoelectric ceramic material layer, the length of the piezoelectric ceramic material layer is greater than that of the magnetostrictive material layer, the two magnetostrictive material layers are respectively positioned at two sides of the piezoelectric ceramic material layer, and two leads are led out from an upper polar plate and a lower polar plate of the piezoelectric ceramic material layer to serve as signal output ports;
s2, when an alternating magnetic field is detected, the magnetostrictive material layer generates magnetostrictive strain under the action of the alternating magnetic field to generate mechanical vibration, and the magnetostrictive material layer transmits the strain generated by the mechanical vibration to the piezoelectric ceramic material layer;
s3, when the piezoelectric ceramic material layer is subjected to the strain action of the magnetostrictive material layer, the dielectric constant of the piezoelectric ceramic material layer changes, the piezoelectric ceramic material layer outputs a changed capacitance value through the lead, and the alternating current magnetic field is detected through the changed capacitance value.
2. The utility model provides a test device based on magnetic dielectric effect surveys magnetic field which characterized in that, includes signal generator, alternating current coil, magnetoelectric composite structure detector and impedance analysis appearance, and alternating current coil twines on magnetoelectric composite structure detector, and the alternating current coil both ends all are connected with signal generator, and magnetoelectric composite structure detector is connected with impedance analysis appearance.
3. The test device for detecting the magnetic field based on the magneto-dielectric effect according to claim 2, wherein the magnetoelectric composite structure detector comprises two magnetostrictive material layers and a piezoelectric ceramic material layer, the two magnetostrictive material layers are respectively positioned at two sides of the piezoelectric ceramic material layer, and two leads led out from an upper polar plate and a lower polar plate of the piezoelectric ceramic material layer are both connected with an impedance analyzer; the magnetostrictive material layer and each layer of the piezoelectric ceramic material layer are bonded by epoxy resin glue to form an M-P-M sandwich structure.
4. The magneto-dielectric effect based magnetic field detection test device according to claim 1 or 3, wherein the magnetostrictive material layer is terbium-doped nickel zinc ferrite material, and the piezoelectric ceramic material layer is PZT-8 piezoelectric ceramic material.
5. The working method of the test device for detecting the magnetic field based on the magneto-dielectric effect is characterized by comprising the following steps of:
a1, applying high-frequency current to the alternating current coil through a signal generator to form a high-frequency alternating current magnetic field as a magnetic field to be measured;
a2, adjusting a signal generator to respectively obtain alternating current magnetic fields with different frequencies and different amplitudes, and scanning a capacitance spectrum of an output port of the magnetic field composite structure detector through an impedance analyzer to realize the characterization of the alternating current magnetic field composite structure detector under different conditions;
a3, according to the step A2, under a certain frequency, the output amplitude of the signal generator is stepped, the capacitance amplitude of the output port of the scanning magnetic field composite structure detector changes along with the amplitude of the magnetic field, and the dependence characteristic of the capacitance along with the magnetic field, namely the sensitivity of the magnetic field-capacitance is obtained;
a4, according to the step A2, in the low magnetic field amplitude range, the lowest threshold magnetic field amplitude is taken as the signal output step, and the jump curve of the capacitance along with the threshold magnetic field, namely the magnetic field resolution, is obtained;
a5, according to the step A2, under the condition that the input magnetic field is kept stable, the magnetic field composite structure detector keeps the working state for a long time, and the output capacitance stability characteristic is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011223082.8A CN112327225A (en) | 2020-11-05 | 2020-11-05 | Magnetic field detection method based on magneto-dielectric effect, test device and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011223082.8A CN112327225A (en) | 2020-11-05 | 2020-11-05 | Magnetic field detection method based on magneto-dielectric effect, test device and working method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112327225A true CN112327225A (en) | 2021-02-05 |
Family
ID=74315716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011223082.8A Pending CN112327225A (en) | 2020-11-05 | 2020-11-05 | Magnetic field detection method based on magneto-dielectric effect, test device and working method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112327225A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113093290A (en) * | 2021-03-03 | 2021-07-09 | 南京理工大学 | Method for detecting weak secondary field signal under same-frequency strong magnetic interference background |
| CN113687277A (en) * | 2021-10-26 | 2021-11-23 | 广东海洋大学 | Test method and system for magnetoelectric composite material sensor |
| CN114251336A (en) * | 2021-11-05 | 2022-03-29 | 湖北塞思博科技有限公司 | Preparation method and detection method of cantilever beam structure magnetoelectric antenna and magnetoelectric antenna |
| CN117728158A (en) * | 2023-12-20 | 2024-03-19 | 苏州万联磁感应通讯科技有限公司 | Combined miniaturized low-frequency receiving antenna |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5675252A (en) * | 1995-06-19 | 1997-10-07 | Sqm Technology, Inc. | Composite structured piezomagnetometer |
| CN110389308A (en) * | 2018-04-16 | 2019-10-29 | 南京理工大学 | Magnetostriction/Piezoelectric anisotropy sensitivity enhancement magnetic gradient probe |
-
2020
- 2020-11-05 CN CN202011223082.8A patent/CN112327225A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5675252A (en) * | 1995-06-19 | 1997-10-07 | Sqm Technology, Inc. | Composite structured piezomagnetometer |
| CN110389308A (en) * | 2018-04-16 | 2019-10-29 | 南京理工大学 | Magnetostriction/Piezoelectric anisotropy sensitivity enhancement magnetic gradient probe |
Non-Patent Citations (1)
| Title |
|---|
| 何文强 等: "电容型磁阻抗效应的退磁因子影响研究", 《南京师大学报(自然科学版)》, 20 June 2018 (2018-06-20), pages 39 - 44 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113093290A (en) * | 2021-03-03 | 2021-07-09 | 南京理工大学 | Method for detecting weak secondary field signal under same-frequency strong magnetic interference background |
| 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 |
| CN114251336A (en) * | 2021-11-05 | 2022-03-29 | 湖北塞思博科技有限公司 | Preparation method and detection method of cantilever beam structure magnetoelectric antenna and magnetoelectric antenna |
| CN117728158A (en) * | 2023-12-20 | 2024-03-19 | 苏州万联磁感应通讯科技有限公司 | Combined miniaturized low-frequency receiving antenna |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112327225A (en) | Magnetic field detection method based on magneto-dielectric effect, test device and working method thereof | |
| CN108614144A (en) | A kind of current sensor based on automatic biasing magnetic electric compound material | |
| CN110389308A (en) | Magnetostriction/Piezoelectric anisotropy sensitivity enhancement magnetic gradient probe | |
| CN110333378B (en) | Magnetoelectric laminated material current sensing device based on magnetic convergence effect | |
| CN107356832B (en) | A kind of magnetoelectricity gyroscope and its power conversion efficiency measuring device | |
| Lu et al. | Magnetoelectric composite Metglas/PZT-based current sensor | |
| CN103105591A (en) | Zero-bias magnetic sensor probe | |
| CN104006909A (en) | Cable force detecting method and cable force sensor using same | |
| CN106291408A (en) | Based on magnetostrictor and the magnetoelastic transducer of electret | |
| CN109282879B (en) | A kind of contactless EMAT detection method and its system of micro-mass sensor | |
| CN109187732A (en) | A kind of barkhausen signal detection probe and measurement method with lift off measurement | |
| CN107817045A (en) | A kind of magnet coupled resonant type frequency detecting device and frequency detecting method | |
| Israel et al. | Eliminating the temperature dependence of the response of magnetoelectric magnetic-field sensors | |
| CN103344926A (en) | Device for synchronous testing of magnetic property of magnetoelectric material | |
| Qi et al. | Magnetic field sensing based on magnetoelectric coupling of ampere force effect with piezoelectric effect in silver/poly (vinylidine fluoride)/silver laminated composite | |
| CN109444454B (en) | Magnetoelectric rotation speed sensor for measuring rotation speed of wheel | |
| CN111896896B (en) | Giant magneto-impedance magnetic sensor based on magneto-electric double-resonance mode | |
| CN111649660A (en) | Phase-locked amplification-based capacitive displacement measurement device and method | |
| RU138798U1 (en) | DIFFERENT MAGNETIC FIELD SENSOR | |
| RU136189U1 (en) | MAGNETIC FIELD SENSOR | |
| Jia et al. | Magnetoelectric effect from the direct coupling of the Lorentz force from a brass ring with transverse piezoelectricity in a lead zirconate titanate (PZT) disk | |
| Sun et al. | Effects of amplitude and frequency of the modulation field on the sensitivity for low-frequency magnetic field in magnetoelectric sensors | |
| CN108613688A (en) | Multi-functional set sensing device based on magnetic electric compound material and electret | |
| CN106289385B (en) | A kind of Multifunction Sensor | |
| CN112345861A (en) | Annular magnetoelectric gyrator, experimental device and working method of annular magnetoelectric gyrator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |