CN115372416A - Induction type pulse compression magnetoacoustic detection method and system - Google Patents
Induction type pulse compression magnetoacoustic detection method and system Download PDFInfo
- Publication number
- CN115372416A CN115372416A CN202210168364.5A CN202210168364A CN115372416A CN 115372416 A CN115372416 A CN 115372416A CN 202210168364 A CN202210168364 A CN 202210168364A CN 115372416 A CN115372416 A CN 115372416A
- Authority
- CN
- China
- Prior art keywords
- electrode material
- pulse compression
- conductivity
- module
- magnetic field
- 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
- 230000006835 compression Effects 0.000 title claims abstract description 61
- 238000007906 compression Methods 0.000 title claims abstract description 61
- 238000001514 detection method Methods 0.000 title claims abstract description 40
- 230000006698 induction Effects 0.000 title claims abstract description 15
- 239000007772 electrode material Substances 0.000 claims abstract description 124
- 230000005284 excitation Effects 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 36
- 230000000694 effects Effects 0.000 claims abstract description 18
- 230000003068 static effect Effects 0.000 claims description 17
- 230000005684 electric field Effects 0.000 claims description 14
- 238000009826 distribution Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 8
- 230000001939 inductive effect Effects 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000002604 ultrasonography Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000004907 flux Effects 0.000 claims description 3
- 230000035699 permeability Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- KSEYRUGYKHXGFW-UHFFFAOYSA-N 6-methoxy-N-[(1-prop-2-enyl-2-pyrrolidinyl)methyl]-2H-benzotriazole-5-carboxamide Chemical compound COC1=CC2=NNN=C2C=C1C(=O)NCC1CCCN1CC=C KSEYRUGYKHXGFW-UHFFFAOYSA-N 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 description 7
- 239000000523 sample Substances 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
Abstract
The invention provides an induction type pulse compression magnetoacoustic detection method, which comprises the steps of firstly exciting an electrode material (600) to generate a thermoacoustic effect and a magnetoacoustic effect through a pulse compression magnetic field excitation module (100) and a magnet magnetostatic field module (200), then receiving thermoacoustic signals and magnetoacoustic signals through an ultrasonic transducer (300) arranged around the electrode material (600) in an array manner, and finally collecting the ultrasonic signals through a signal acquisition module (400) and a conductivity module (500) and reconstructing the conductivity of the electrode material (600); wherein the conductivity module (500) reconstructs the conductivity of the electrode material (600) by a time-reversal method and a least squares iterative algorithm. The method can realize non-contact detection of the conductivity of the electrode material of the supercapacitor without damaging the electrode material, and has the advantages of low pulse compression magnetic field intensity and low energy consumption, and the adopted system is miniaturized and is convenient to carry.
Description
Technical Field
The invention relates to the technical field of conductivity detection, in particular to an induction type pulse compression magnetoacoustic detection method and system.
Background
With the continuous exhaustion of fossil fuels and the increasing serious problems of environmental pollution and the like, the search for efficient, environment-friendly and practical alternative energy sources also becomes one of the most urgent tasks of people at present; nowadays, the conventional lithium ion battery has become an indispensable part of human life, and provides a new selection direction for the revolution of portable electronic products. However, for the applications of electric vehicles, power grid storage and the like with continuously expanding scale, the proliferation of electrochemical energy storage depends on the strict performance of the battery in the future, such as safety, energy density, cost requirement, storage capacity and the like, and the performance of the existing traditional lithium ion battery can not completely meet the requirements. Supercapacitors have received much attention due to their high safety, high energy density, long cycle life, and fast charge-discharge and energy storage characteristics.
The performance of the super capacitor is closely related to the conductivity of the electrode material, namely the conductivity directly determines the charge and discharge performance of the super capacitor, so that the detection of the conductivity of the electrode material is a crucial link in the process of developing and producing the super capacitor. At present, the conductivity detection method of the electrode material of the super capacitor mainly comprises a four-probe method and an induction type thermo-acoustic detection method. The four-probe method is a contact detection method, and the contact of the probes and the electrode material in the detection process easily causes the damage of the material, thereby directly causing the scrapping of the detected super capacitor and increasing the production cost; meanwhile, the shape of the target detected by the four-probe method is circular or rectangular, and the target is fixed aiming at the target and is narrow in application. Compared with a contact detection method, the non-contact induction type thermo-acoustic detection method does not contact with an electrode material, does not cause material damage, and is unlimited in shape of the detection material and wide in application range; however, the induction type thermo-acoustic detection method requires a large alternating magnetic field, high energy consumption and high detection cost, and the induction type thermo-acoustic detection method has a large system, is inconvenient to carry, occupies a large space, is difficult to maintain and maintain in a later period, and is complex in industrialization and continuous detection operation.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide an induction type pulse compression magnetoacoustic detection method, which can realize non-contact detection of the conductivity of an electrode material of a supercapacitor without damaging the electrode material, and has the advantages of low pulse compression magnetic field intensity, low energy consumption, system miniaturization and portability.
Another objective of the present invention is to provide a system for the inductive pulse compression magnetoacoustic detection method.
The purpose of the invention is realized by the following technical scheme:
an induction type pulse compression magnetoacoustic detection method is characterized in that: the method comprises the following steps:
firstly, electrode materials of a supercapacitor are placed between a pulse compression magnetic field excitation source coil and a magnet, the electrode materials are excited by the pulse compression magnetic field excitation source to generate eddy currents, a thermoacoustic effect is generated in the electrode materials (namely, the materials are heated and expanded under the excitation action of the pulse compression magnetic field to send out thermoacoustic signals), and the electrode materials and a static magnetic field matched with the magnet generate a magnetoacoustic effect (namely, the eddy currents generate Lorentz force under the excitation action of the pulse compression magnetic field and the excitation action of the static magnetic field, and the electrode materials are vibrated by the Lorentz force to generate magnetoacoustic signals); then, receiving thermoacoustic signals emitted by the electrode material due to thermal expansion and magneto-acoustic signals emitted by the electrode material due to Lorentz force by the ultrasonic transducers arranged around the electrode material in an array (the thermoacoustic signals and the magneto-acoustic signals form ultrasonic signals, the same applies below); finally, processing the ultrasonic signals received by the ultrasonic transducer by using a signal acquisition module, and reconstructing the conductivity of the electrode material according to the ultrasonic signals by using a conductivity module;
the conductivity module is used for reconstructing the conductivity of the electrode material according to the ultrasonic signal, and specifically comprises the following steps: firstly, reconstructing a thermal function and Lorentz force divergence of an electrode material in an ultrasonic signal by a time reversal method, then reconstructing electric field intensity inside the electrode material by the obtained thermal function and Lorentz force divergence, and finally reconstructing conductivity distribution of the electrode material by a least square iterative algorithm.
Further optimization is carried out, wherein the thermal function and Lorentz force divergence of the electrode material reconstructed by the time reversal method specifically comprises the following steps:
calculating and obtaining the divergence of the thermal function space absorption coefficient and the Lorentz force in the ultrasonic signals by using a time reversal method, wherein the specific formula is as follows:
in the formula, C P Represents the specific heat capacity of the electrode material (determined by the particular electrode material employed); beta represents the volume expansion coefficient of the electrode material (determined by the specific electrode material used); q (r) represents the spatial absorption coefficient of the thermal function;
representing the gradient, is a mathematical calculation symbol, F represents the Lorentz force inside the material to be detected,
represents the Lorentz force divergence of the electrode material; Ω represents a curved surface where the ultrasonic transducer is located, and specifically: a circle obtained by taking the position of the electrode material as a central position and taking the distance between the ultrasonic transducer and the central position as a radius is a curved surface where the ultrasonic transducer is positioned; c. C s Represents the propagation velocity of the acoustic wave; r represents the position of the electrode material; p (r) d And t) denotes that the ultrasonic transducer is at the detection point r d Receiving the ultrasonic signal; t denotes a reception time.
Further optimizing, the propagation speed of the acoustic wave is obtained by measuring and calculating with an ultrasonic transducer, and specifically comprises the following steps: before the test is started, the ultrasonic transducer is used for sending and receiving sound waves in combination with the environment where the electrode material is located, and the propagation speed of the sound waves is calculated through the propagation distance and the time difference of the sound waves.
Further optimization is carried out, the step of reconstructing the electric field intensity inside the electrode material through the obtained thermal function and the Lorentz force divergence and the step of reconstructing the conductivity distribution of the electrode material through a least square iterative algorithm specifically comprise the following steps:
the electric field strength is first reconstructed by the lorentz force divergence:
wherein J represents an internal current density of the electrode material; b represents the magnetic flux density at the position of the electrode material; e represents the internal electric field strength of the electrode material; σ represents the electrical conductivity of the electrode material; z represents a direction;
and then reconstructing the electric field intensity through the thermal function space absorption coefficient:
Q(r)＝σ|E(r)| 2 ；
and finally, reconstructing the conductivity distribution of the electrode material by a least square iterative algorithm:
in the formula, f (sigma) represents an established least square objective function; a represents the vector magnetic potential generated by the pulse compression current; phi denotes a scalar potential.
For further optimization, the vector magnetic potential generated by the pulse compression current is obtained by the following method:
firstly, setting the radius of an axisymmetrical current-carrying coil as a, the introduced excitation pulse compression current as I (t), the plane where the coil is located is parallel to a plane Z =0, and the center of the circle of the coil is located at the origin of a coordinate system, so that the vector magnetic potential A generated by the line current is:
in the formula, mu 0 Represents the permeability in vacuum;
representing the integration of a circumferential line of a current carrying coil; e represents a unit vector.
Further optimization is carried out, and the specific method for obtaining the scalar potential comprises the following steps:
in the formula, n represents a normal unit vector of the boundary S, and the boundary S is the boundary of the region to be measured where the electrode material is located.
The system adopted by the induction type pulse compression magnetoacoustic detection method is characterized in that:
the method comprises the following steps: the pulse compression magnetic field excitation module is used for exciting the interior of the electrode material to generate eddy current so as to enable the electrode material to generate a thermoacoustic effect; the magnet static magnetic field module is used for being matched with the pulse compression magnetic field excitation module to generate a magnetoacoustic effect; the ultrasonic transducer is used for receiving an ultrasonic signal sent by the electrode material; the signal acquisition module is used for amplifying and filtering the ultrasonic signals in the ultrasonic transducer; a conductivity module for reconstructing a conductivity distribution of the electrode material;
the coil of the pulse compression magnetic field excitation module and the magnet static magnetic field module are respectively arranged at the upper end and the lower end of an electrode material of the supercapacitor; the ultrasonic transducers are arranged in an array around the electrode material of the supercapacitor; the signal acquisition module is respectively and electrically connected with the pulse compression magnetic field excitation module, the ultrasonic transducer and the conductivity module.
For further optimization, the pulse compression magnetic field excitation module adopts a pulse excitation source which can emit an alternating magnetic field generated by continuous pulse compression current with 2-10 high and low levels and a pulse width of 680-720 ns.
For further optimization, the magnet static magnetic field module adopts a magnet capable of generating a static magnetic field of 0.28-0.32T.
For further optimization, the signal acquisition module comprises an amplifier and a filter.
The invention has the following technical effects:
compared with the existing method for detecting the conductivity of the electrode material in a contact manner, the method can realize the non-contact detection of the conductivity of the electrode material of the supercapacitor, does not need to contact with the electrode material, avoids the damage to the electrode material, does not need to specifically limit the shape of the electrode material, and effectively ensures that the system has a wide range of objects; compared with the existing induction type thermo-acoustic detection method, the pulse magnetic field required by the application is small: an excitation coil in the induction type thermoacoustic detection method needs excitation voltage of about 1000V, the excitation voltage required by the method is not higher than 100V (namely the required pulse compression magnetic field is small), the energy consumption is low, the high-voltage environment detection is avoided, the safety of a test environment is effectively ensured, meanwhile, the conductivity is reestablished through thermoacoustic signals and magnetoacoustic signals of electrode materials, the test information is complete, the obtained conductivity precision is higher, the test error influence is smaller, and the method is particularly suitable for conductivity test of the electrode materials with large thermal expansion influence
The detection method has the advantages that the adopted system is small, the carrying is convenient, and the space occupied by the test system can be effectively reduced, so that the test of the conductivity of the supercapacitor in a laboratory or industrial production is facilitated; meanwhile, the system adopted by the method is simple and convenient to operate, wide in application range, convenient to maintain and maintain in the later period and low in test cost.
Drawings
Fig. 1 is a schematic structural diagram of an inductive pulse compression magnetoacoustic detection system in an embodiment of the present invention.
100. A pulse compression magnetic field excitation module; 200. a magnet static magnetic field module; 300. an ultrasonic transducer; 400. a signal acquisition module; 401. an amplifier; 402. a filter; 500. a conductivity module; 600. an electrode material.
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 1, an inductive pulse compression magnetoacoustic detection method is characterized in that: the method comprises the following steps:
firstly, an electrode material 600 of a supercapacitor is placed between a pulse compression magnetic field excitation source coil and a magnet, the electrode material 600 is excited by the pulse compression magnetic field excitation source to generate eddy current, a thermoacoustic effect is generated in the electrode material 600 (namely, the material is heated and expanded under the excitation action of the pulse compression magnetic field to send out thermoacoustic signals), and the magnetoacoustic effect is generated by matching with a magnetostatic field of the magnet (namely, the eddy current generates Lorentz force under the excitation action of the pulse compression magnetic field and the magnetostatic field, and the electrode material 600 is vibrated by the Lorentz force to generate magnetoacoustic signals); then, the ultrasonic transducer 300 arranged around the electrode material 600 in an array receives a thermo-acoustic signal generated by the electrode material 600 expanding due to heat and a magneto-acoustic signal generated by the electrode material 600 due to the lorentz force (the thermo-acoustic signal and the magneto-acoustic signal form an ultrasonic signal, the same applies below); finally, the signal acquisition module 400 is adopted to process the ultrasonic signals received by the ultrasonic transducer 300, and the conductivity of the electrode material 600 is reconstructed by the conductivity module 500 according to the ultrasonic signals;
the conductivity module 500 reconstructs the conductivity of the electrode material 600 according to the ultrasonic signal, specifically: firstly, the divergence between the thermal function and the Lorentz force of the electrode material 600 in the ultrasonic signal is reconstructed by a time reversal method,
the method specifically comprises the following steps:
the time reversal method is used for calculating and obtaining the divergence of the thermal function space absorption coefficient and the Lorentz force in the ultrasonic signals, and the specific formula is as follows:
in the formula, C P Represents the specific heat capacity of the electrode material (determined by the particular electrode material employed); beta represents the volume expansion coefficient of the electrode material (determined by the specific electrode material adopted); q (r) represents the spatial absorption coefficient of the thermal function;
representing the gradient, is a mathematical calculation symbol, F represents the Lorentz force inside the material to be detected,
represents the Lorentz force divergence of the electrode material; Ω represents a curved surface where the ultrasonic transducer is located, and specifically: a circle obtained by taking the position of the electrode material as a central position and taking the distance between the ultrasonic transducer and the central position as a radius is a curved surface where the ultrasonic transducer is positioned; c. C s Represents the propagation velocity of the acoustic wave; r represents the position of the electrode material; p (r) d And t) denotes that the ultrasonic transducer is at the detection point r d Receiving the ultrasonic signal; t denotes a reception time.
The propagation velocity of the acoustic wave is obtained by measuring and calculating with the ultrasonic transducer 300, specifically: before the test is started, the ultrasonic transducer 300 is used to emit and receive sound waves in combination with the environment of the electrode material 600, and the propagation velocity of the sound waves is calculated through the propagation distance and the time difference of the sound waves.
Then, the electric field intensity inside the electrode material 600 is reconstructed through the obtained thermal function and the lorentz force divergence, and finally, the conductivity distribution of the electrode material 600 is reconstructed through a least square iterative algorithm, which specifically comprises the following steps:
the electric field strength is first reconstructed by the lorentz force divergence:
wherein J represents an internal current density of the electrode material; b represents the magnetic flux density at the position of the electrode material; e represents the internal electric field intensity of the electrode material; σ represents the electrical conductivity of the electrode material; z represents a direction;
and then reconstructing the electric field intensity through the thermal function space absorption coefficient:
Q(r)＝σ|E(r)| 2 ；
finally, the conductivity distribution of the electrode material 600 is reconstructed by a least squares iterative algorithm:
in the formula, f (sigma) represents an established least square objective function; a represents the vector magnetic potential generated by the pulse compression current; phi denotes a scalar potential.
The vector magnetic bit obtaining method generated by the pulse compression current comprises the following steps:
firstly, setting the radius of an axisymmetrical current-carrying coil as a, the introduced excitation pulse compression current as I (t), the plane where the coil is located is parallel to a plane Z =0, and the center of the circle of the coil is located at the origin of a coordinate system, so that the vector magnetic potential A generated by the line current is:
in the formula, mu 0 Represents the permeability in vacuum;
representing the integration of a circumferential line of a current carrying coil; e denotes a unit vector.
The scalar potential is obtained by the following specific method:
in the formula, n represents a normal unit vector of the boundary S, and the boundary S is a boundary of the region to be measured where the electrode material is located.
The system adopted by the induction type pulse compression magnetoacoustic detection method,
the method comprises the following steps: the pulse compression magnetic field excitation module 100 is used for exciting the interior of the electrode material 600 to generate eddy current, so that the electrode material 600 generates a thermoacoustic effect; a magnet static magnetic field module 200 for generating a magnetoacoustic effect in cooperation with the pulse compression magnetic field excitation module 100; an ultrasonic transducer 300 for receiving an ultrasonic signal emitted from the electrode material 600; a signal acquisition module 400, configured to amplify and filter the ultrasound signal in the ultrasound transducer 300; a conductivity module 500 for reconstructing a conductivity distribution of the electrode material 600;
the coil of the pulse compression magnetic field excitation module 100 and the magnet static magnetic field module 200 are respectively arranged at the upper end and the lower end of the electrode material 600 of the supercapacitor; the ultrasonic transducers 300 are arranged in an array around the electrode material 600 of the supercapacitor; the signal acquisition module 400 is electrically connected with the pulse compression magnetic field excitation module 100, the ultrasonic transducer 300 and the conductivity module 500 respectively.
The pulse compression magnetic field excitation module 100 adopts a pulse excitation source which can emit an alternating magnetic field generated by continuous pulse compression current with 2-10 high and low levels and pulse widths of 680-720 ns (preferably 700 ns); the magneto-static magnetic field module 200 uses a magnet capable of generating a static magnetic field of 0.28 to 0.32T (preferably 0.3T); the signal acquisition module 400 comprises an amplifier 401 and a filter 402.
In the test, firstly, the electrode material 600 is placed between the coil of the pulse compression magnetic field excitation module 100 and the magnet static magnetic field module 200 (as shown in fig. 1), and then the pulse compression magnetic field excitation module 100 is started to excite the electrode material 600; eddy current is generated in the electrode material 600, and under the combined action of the eddy current and the static magnetic field of the magnet static magnetic field module 200, two effects are generated, namely, a thermoacoustic effect, namely that the interior of the material is heated and expanded to send out a thermoacoustic signal; firstly, the magnetoacoustic effect is that the eddy current in the material generates Lorentz force under the action of static magnetic field, and vibrates to send out magnetoacoustic signal; the ultrasonic signals composed of the thermoacoustic signals and the magnetoacoustic signals are received by the ultrasonic transducers 300 arranged in an array around the electrode material 600, amplified and filtered by the signal acquisition module 400 and transmitted to the conductivity module 500, and finally the conductivity distribution of the electrode material 600 is reconstructed in the conductivity module 500 by combining a time reversal method and a least square iterative algorithm.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. An induction type pulse compression magnetoacoustic detection method is characterized in that: the method comprises the following steps:
firstly, an electrode material (600) of a super capacitor is placed between a pulse compression magnetic field excitation source coil and a magnet, the electrode material (600) is excited by the pulse compression magnetic field excitation source to generate eddy current, a thermoacoustic effect is generated in the electrode material (600), and the thermoacoustic effect is generated by matching with a static magnetic field of the magnet; then, receiving thermoacoustic signals emitted by the electrode material (600) through an ultrasonic transducer (300) arranged around the electrode material (600) in an array manner, and magneto-acoustic signals emitted by the electrode material (600) under the action of Lorentz force; finally, the signal acquisition module (400) is adopted to process the ultrasonic signals received by the ultrasonic transducer (300), and the conductivity of the electrode material (600) is reconstructed according to the ultrasonic signals by the conductivity module (500);
the conductivity module (500) reconstructs the conductivity of the electrode material (600) according to the ultrasonic signal, specifically: firstly, the thermal function and the Lorentz force divergence of an electrode material (600) in an ultrasonic signal are reconstructed through a time reversal method, then the electric field intensity inside the electrode material (600) is reconstructed through the obtained thermal function and the Lorentz force divergence, and finally the conductivity distribution of the electrode material (600) is reconstructed through a least square iterative algorithm.
2. An inductive pulse compression magnetoacoustic detection method as claimed in claim 1, characterized in that: the reconstruction of the divergence of the thermal function and the Lorentz force of the electrode material (600) by a time reversal method is specifically as follows:
the time reversal method is used for calculating and obtaining the divergence of the thermal function space absorption coefficient and the Lorentz force in the ultrasonic signals, and the specific formula is as follows:
in the formula, C P Represents the specific heat capacity of the electrode material; β represents a volume expansion coefficient of the electrode material; q (r) represents the spatial absorption coefficient of the thermal function;
representing the gradient, is a mathematical calculation symbol, F represents the Lorentz force inside the material to be detected,
represents the Lorentz force divergence of the electrode material; Ω represents a curved surface where the ultrasonic transducer is located, and specifically: a circle obtained by taking the position of the electrode material as a central position and taking the distance between the ultrasonic transducer and the central position as a radius is a curved surface where the ultrasonic transducer is positioned; c. C s Represents the propagation velocity of the acoustic wave; r represents the position of the electrode material; p (r) d And t) denotes that the ultrasonic transducer is at the detection point r d To receive the received superAn acoustic signal; t denotes a reception time.
3. An inductive pulse compression magnetoacoustic detection method as claimed in claim 1 or 2, characterized in that: the method for reconstructing the electric field intensity inside the electrode material (600) through the obtained thermal function and the Lorentz force divergence and reconstructing the conductivity distribution of the electrode material (600) through a least square iterative algorithm specifically comprises the following steps:
the electric field strength is first reconstructed by the lorentz force divergence:
wherein J represents an internal current density of the electrode material; b represents the magnetic flux density at the position of the electrode material; e represents the internal electric field strength of the electrode material; σ represents the electrical conductivity of the electrode material; z represents a direction;
and then reconstructing the electric field intensity through the thermal function space absorption coefficient:
Q(r)＝σ|E(r)| 2 ；
finally, the conductivity distribution of the electrode material (600) is reconstructed by a least squares iterative algorithm:
in the formula, f (sigma) represents an established least square objective function; a represents the vector magnetic potential generated by the pulse compression current; phi denotes a scalar potential.
4. An inductive pulse compression magnetoacoustic detection method as claimed in any one of claims 1 to 3, characterized in that: the vector magnetic bit obtaining method generated by the pulse compression current comprises the following steps:
firstly, setting the radius of an axisymmetrical current-carrying coil as a, the introduced excitation pulse compression current as I (t), the plane where the coil is located is parallel to a plane Z =0, and the center of the circle of the coil is located at the origin of a coordinate system, so that the vector magnetic potential A generated by the line current is:
in the formula, mu 0 Represents the magnetic permeability in vacuum;
means for integrating a circumferential line of a current carrying coil; e denotes a unit vector.
5. An inductive pulse compression magnetoacoustic detection method as claimed in claim 1, characterized in that:
the system adopted by the method comprises the following steps: the pulse compression magnetic field excitation module (100) is used for exciting the interior of the electrode material (600) to generate eddy current so as to enable the electrode material (600) to generate a thermoacoustic effect; the magnet static magnetic field module (200) is used for generating a magnetoacoustic effect in cooperation with the pulse compression magnetic field excitation module (100); an ultrasonic transducer (300) for receiving an ultrasonic signal emitted by the electrode material (600); a signal acquisition module (400) for amplifying and filtering the ultrasound signal in the ultrasound transducer (300); a conductivity module (500) for reconstructing a conductivity distribution of the electrode material (600);
the coil of the pulse compression magnetic field excitation module (100) and the magnet static magnetic field module (200) are respectively arranged at the upper end and the lower end of an electrode material (600) of the supercapacitor; the ultrasound transducers (300) are arranged in an array around an electrode material (600) of a supercapacitor; the signal acquisition module (400) is respectively electrically connected with the pulse compression magnetic field excitation module (100), the ultrasonic transducer (300) and the conductivity module (500).
6. An inductive pulse compression magnetoacoustic detection method as claimed in claim 5, characterized in that: the pulse compression magnetic field excitation module (100) adopts a pulse excitation source which can emit an alternating magnetic field generated by continuous pulse compression current with 2-10 high and low levels and a pulse width of 680-720 ns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210168364.5A CN115372416A (en) | 2022-02-23 | 2022-02-23 | Induction type pulse compression magnetoacoustic detection method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210168364.5A CN115372416A (en) | 2022-02-23 | 2022-02-23 | Induction type pulse compression magnetoacoustic detection method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115372416A true CN115372416A (en) | 2022-11-22 |
Family
ID=84060010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210168364.5A Pending CN115372416A (en) | 2022-02-23 | 2022-02-23 | Induction type pulse compression magnetoacoustic detection method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115372416A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104434094A (en) * | 2014-12-14 | 2015-03-25 | 中国科学院电工研究所 | Conductivity image reconstructing method for magneto-thermoacoustic coupled tomography |
| CN104434101A (en) * | 2014-12-14 | 2015-03-25 | 中国科学院电工研究所 | Magneto-thermoacoustic tomographic method and system |
| CN105816156A (en) * | 2016-05-17 | 2016-08-03 | 中国医学科学院生物医学工程研究所 | Magneto-acoustic conductivity imaging device combining thermo-acoustic effect signal and imaging method |
| CN107049315A (en) * | 2017-02-20 | 2017-08-18 | 中国科学院电工研究所 | Based on the Injection Current formula thermoacoustic resistivity image method for reconstructing for optimizing alternative manner |
| CN111458566A (en) * | 2020-05-20 | 2020-07-28 | 重庆文理学院 | Non-contact detection method and system for conductivity of energy storage material |
-
2022
- 2022-02-23 CN CN202210168364.5A patent/CN115372416A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104434094A (en) * | 2014-12-14 | 2015-03-25 | 中国科学院电工研究所 | Conductivity image reconstructing method for magneto-thermoacoustic coupled tomography |
| CN104434101A (en) * | 2014-12-14 | 2015-03-25 | 中国科学院电工研究所 | Magneto-thermoacoustic tomographic method and system |
| CN105816156A (en) * | 2016-05-17 | 2016-08-03 | 中国医学科学院生物医学工程研究所 | Magneto-acoustic conductivity imaging device combining thermo-acoustic effect signal and imaging method |
| CN107049315A (en) * | 2017-02-20 | 2017-08-18 | 中国科学院电工研究所 | Based on the Injection Current formula thermoacoustic resistivity image method for reconstructing for optimizing alternative manner |
| CN111458566A (en) * | 2020-05-20 | 2020-07-28 | 重庆文理学院 | Non-contact detection method and system for conductivity of energy storage material |
Non-Patent Citations (2)
| Title |
|---|
| 夏慧;刘国强;黄欣;郭亮;: "注入电流式磁声成像平面模型的逆问题研究", 电工技术学报, no. 04, 25 February 2017 (2017-02-25), pages 147 - 153 * |
| 杨延菊 等: "脉冲磁激励的磁声效应和热声效应的仿真研究", 生物医学工程学杂志, vol. 34, no. 1, 25 February 2017 (2017-02-25), pages 21 - 26 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103149513B (en) | Positioning method and device for reestablishing local discharge ultrasonic source of transformer | |
| Liu et al. | Wireless electric energy transmission through various isolated solid media based on triboelectric nanogenerator | |
| CN101343999B (en) | Array magnetic-acoustic electro-conductibility imaging logging method and apparatus | |
| Yu et al. | A method of characterising performance of audio loudspeakers for linear alternator applications in low-cost thermoacoustic electricity generators | |
| CN111458566A (en) | Non-contact detection method and system for conductivity of energy storage material | |
| CN103281044B (en) | A kind of active frequency tuning methods of magnetic pumping pressure drag vibration-pickup type MEMS resonator | |
| CN103837581B (en) | A kind of lithium ion battery pick-up unit | |
| CN103475265A (en) | Bistable double-piezoelectric cantilever beam vibration energy collector | |
| Niculae et al. | Magnetic coupling analysis in wireless transfer energy | |
| Zhang et al. | Design of a new type of omnidirectional shear-horizontal EMAT by the use of half-ring magnets and PCB technology | |
| CN115372416A (en) | Induction type pulse compression magnetoacoustic detection method and system | |
| Li et al. | O-ring-modularized triboelectric nanogenerator for robust blue energy harvesting in all-sea areas | |
| Balmain | The properties of antennas in plasmas | |
| CN104473640A (en) | Electric conductivity rebuilding method for magnetocaloric acoustical imaging | |
| Salem et al. | Design of acoustic energy harvesting unit using piezo-electric diaphragm | |
| CN208890682U (en) | Collect the friction nanometer power generator of acoustic wave energy | |
| CN115372415A (en) | Detection method for conductivity of super capacitor | |
| CN105004930A (en) | Novel microwave detection method and device, and application of method | |
| Ma et al. | Investigation on the design and application of 3-dimensional wide-band piezoelectric energy harvester for low amplitude vibration sources | |
| Wang et al. | Rapid State of Health Estimation of Lithium-ion Batteries based on An Active Acoustic Emission Sensing Method | |
| CN202599905U (en) | Electromagnetically acoustic emission nondestructive detection device for non-ferromagnetic metal sheet | |
| CN211043522U (en) | Non-contact static test sensor based on vibration capacitance | |
| Li et al. | Numerical calculation and experimental investigation on optimization of bouncing ball triboelectric nanogenerator | |
| Siva et al. | Piezoelectric based electric energy generation from sound energy | |
| CN111929624A (en) | Magnetic field detector |
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 |