CN104535946A - Specific susceptibility tester - Google Patents
Specific susceptibility tester Download PDFInfo
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- CN104535946A CN104535946A CN201510002619.0A CN201510002619A CN104535946A CN 104535946 A CN104535946 A CN 104535946A CN 201510002619 A CN201510002619 A CN 201510002619A CN 104535946 A CN104535946 A CN 104535946A
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Abstract
The invention discloses a specific susceptibility tester. Existing related devices for testing specific susceptibilities are small in type and number, and similar instruments with related functions have the defects that testing periods are long, a great deal of labor is needed, the price is high or measurement accuracy is low. The specific susceptibility tester comprises an electromagnetism exciting system, a measurement support device, a digital measurement mechanism, a digital magnetic field measurement mechanism, an electrical control device and an automatic measurement software system. The specific susceptibility tester is simple in structure and convenient to use, and can automatically test the specific susceptibility of a substance. The specific susceptibility tester is stable in performance, can automatically adjust the magnetic field environment, collects and processes digital information of a transmission end, and synchronously displays testing data and plane rectangular coordinate images. The specific susceptibility tester is short in testing period, low in power consumption, high in measurement accuracy and capable of automatically generating testing reports.
Description
Technical field
The present invention relates to a kind of equipment measuring material specific susceptibility, particularly measure the specific susceptibility of weak magnetic substance.Instrument automatically regulates magnetic field intensity, automatic control survey mechanism, automatically gathers measurement data, automatically calculation process, automatically shows measurement result, automatically generates surving coordinate image and complete determination report.
Background technology
Specific susceptibility is exactly the magnetic moment that the ore particle of unit mass produces in the external magnetic field of unit strength.It more properly can represent the magnetic of object.Coefficient of magnetization has important application judging whether to exist in material molecule in unpaired electron and complex structure type etc., and the mensuration of coefficient of magnetization relates to the physical quantity such as the magnetization, magnetic induction density, magnetic field intensity, molecular magnetic moment in physics and the structure of matter two subjects simultaneously.Specific susceptibility is as an important physical amount of the strong and weak parameter of magnetic mineral, play a part very important in mineral processing magnetic separation process, wherein the specific susceptibility data that provide of process mineralogy research can gear to actual circumstances from magnetically reflecting and explaining the behavior of each mineral in concrete magnetic separation process ore, this just requires that specific susceptibility can the mensuration of quick, simple and easy, system.The measuring equipment that independently can measure specific susceptibility is at present also few, comprising the vibrating sample magnetometer of magnetic balance, simple and easy specific susceptibility determinator and indirect determination specific susceptibility.
Magnetic balance and simple and easy specific susceptibility determinator are the instruments adopting matter dynamic method directly to record material specific susceptibility, though material specific susceptibility can be measured, but there is the weak point that substance testing scope is little, mechanical test error is large, test period is long, measuring accuracy is low.VSM series and the Japan development BHV series vibrating sample magnetometer of U.S.'s development carry out indirect determination material coefficient of magnetization in the magnetic effect of magnetic field space per sample, this device adopts vibrational system to hang material to be measured, make testing sample internal volume structure and overall being all damaged to a certain extent with stability, reduce the accuracy of test; Simultaneously, superelevation vibration frequency needed for vibrating device is wayward, the control of measurement and accuracy of data acquisition are affected, and vibrating sample magnetometer test result directly comprises material specific susceptibility parameter, magnetic field intensity-specific susceptibility, magnetic field intensity-specific magnetization coordinate diagram picture directly can not be generated; Vibrating sample magnetometer is tested under high magnetic field intensity environment also needs additional cooling system, can increase occupation area of equipment on the one hand, increases energy resource consumption and maintenance cost on the other hand; Vibrating sample magnetometer also exists expensive serious problems as import equipment, and the limitation of application limits the progress of domestic specific susceptibility research work.Therefore, for deficiency and the Problems existing of existing Testing of specific susceptibility pertinent instruments, invented a kind of instrument of automatic mensuration material specific susceptibility.
Summary of the invention
The present invention is for mechanics law invention in Problems existing in above-mentioned correlation ratio coefficient of magnetization determining instrument and magnetic field.
According to mechanics law in magnetic field, the magnetic force acted on particle can be write as
（1）
In formula
the magnetic force that-particle is subject in magnetic field;
-permeability of vacuum;
the mass volume magnetic susceptibility of-particle;
the volume of particle;
the volume element of-particle
magnetic field intensity in-particle volume.
Symbol grad is drawn together in integration type, and supposes that volume susceptibility is constant in the scope shared by particle, then
(2)
When particle size is little, can suppose that the change of HgradH in the volume occupied by it is little.Like this, HgradH can move on to outside the sign of integration, so
to be written as
(3)
Through commonly using than magnetic force (N/kg) in magnetic separation.It acts on the magnetic force on unit mass particle, namely
(4)
In formula
-compare magnetic force;
the quality of-particle, kg;
the density of-particle;
the object specific susceptibility of-particle,
, m
3/ kg;
-magnetic field force, A
2/ m
3.
From formula (4),
（5）
So mineral specific susceptibility
mensuration, indirect reformer is
, m, HgradH mensuration.
The magnetic architecture that the specific susceptibility determinator of invention design adopts Central Symmetry annulus corner cut formula field core to combine with circular arc field coil designs, provide the high magnetic field gradients gradH needed for material Testing of specific susceptibility, wherein the annular center corner cut number of degrees are generally 15 ~ 45 °, provide the space magnetic field intensity that material specific susceptibility is accurately measured.
The design of magnetic architecture breaks through cylindrical magnetic cartridge boundary, the vector change in the vertical direction of magnetic field intensity in electromagnetism excitation system and magnetic field gradient can be surveyed, and what this instrument can be intelligent measures material specific susceptibility in the short period of time and automatically generates the complete test report of portion.
Produce sample to be tested according to mensuration requirement, determine to comprise test model, test condition that change of magnetic field strength scope, magnetic field intensity regulate step-length, flux control precision and result display precision automatically.
According to formula (5), specific susceptibility determinator coordinates the heavy m of the empty sample loader of automatic measuring software system control figure measuring mechanism automatic weighing
1, take off after sample to be measured got by sample loader dress and install back sample suspender, the heavy m of the full sample loader of software systems control figure measuring mechanism automatic weighing
2, the automatic calculation sample quality m=m of system
1-m
2, automatically regulate sample place space magnetic field power, i.e. HgradH by the required magnetic field environment system of mensuration.System automatically gathers the numerical information via the transmission of magnetic field intensity measuring mechanism and is recorded in operation program, and system can realize magnetic field intensity fixed point or magnetic field intensity auto step extent interval measurement material specific susceptibility.Under weak magnetic substance and middle magnetisable material Testing of specific susceptibility require that magnetic system iron core remains on Small Distance condition, with ensure excitation mechanism can provide weak magnetic mineral measure needed for higher magnetic field intensity and magnetic field gradient; Under ferromagnetic substance Testing of specific susceptibility requires that magnetic system iron core remains on Large space condition, ensureing to strengthen magnetic system iron core space as far as possible under the condition measuring required magnetic field intensity, and then reducing the magnetization degree of strongly magnetic mineral material under higher magnetic field environment.Testing of specific susceptibility system ensure mensuration program stable while, system interface automatic synchronization shows test results and measures coordinate diagram picture, and user's alternative is preserved, exported, and prints measurement result file or complete determination report.
The present invention adopts following technical scheme:
A kind of specific susceptibility determinator, mainly comprises electromagnetism excitation system, measures bracing or strutting arrangement, digital measurement mechanism, digital magnetic field intensity measuring mechanism, sample suspender, electrical control gear and automatic measuring software system.
Described electromagnetism excitation system is by magnetic system seat, multifunctional universal castor, magnetic conduction jaw, circular arc field coil, circular arc field core, magnetic system Rapid adjustment mechanism and level meter are formed, wherein circular arc field core and the design of circular arc field coil break through cylindricality boundary, adopt the design that Central Symmetry annulus corner cut formula field core combines with circular arc field coil, while achieving the high magnetic field intensity needed for Accurate Measurement material specific susceptibility, ensure that circular arc magnetic architecture produces higher magnetic field gradient, vertical direction stressed larger at more large sample place, general angle of inclination, but when angle large to a certain extent time, magnetic field gradient reduced again, so suitable magnetic system iron core angle and magnetic field gradient ensure that sample is in space magnetic field uniform force, easy survey, crucial accurately, this magnetic system iron core angle scope of design is at 15 ° ~ 45 °, this angular range in turn ensure that the magnetic field gradient of sample space magnetic field environment while ensure that the required magnetic field intensity of test, magnetic system Rapid adjustment mechanism is made up of iron core tubular shaft, gland, rotary handle, iron core is fixed on iron core tubular shaft by key fit system, by gland, tubular shaft inside is closed, regulate rotary handle, can quick adjustment magnetic system iron core space, by regulating rotary handle adjustment magnetic system iron core space, realize significantly Non-follow control Testing of specific susceptibility requisite space magnetic field intensity and magnetic field gradient.
The multifunctional universal castor having Level tune function concurrently is installed in described corner, measurement bracing or strutting arrangement bottom, the convenience of universal caster wheel movement can be played when appliance requires moves, when regulating measurement bracing or strutting arrangement level, the spiral support level(l)ing device of rearmounted function universal caster wheel works; Measure bracing or strutting arrangement upper face and the coordinate regulating device of digital measurement mechanism, the track of digital measurement mechanism movement and level meter are installed, the front and back position that wherein track of digital measurement mechanism movement contributes to digital measurement mechanism significantly moves, the coordinate regulating device of digital measurement mechanism contributes to the fine adjustment of digital measurement mechanism three-dimensional coordinate, to ensure that sample suspender is positioned at Ci Xi center, ensure the accuracy of Testing of specific susceptibility.
Described digital measurement mechanism comprises power supply and the data transmission terminal that the high accuracy number being built in measuring mechanism is measured movement, digital circuit board and is placed on mechanism, wherein high accuracy number measures the mass change that movement can detect 0.0001g, be placed on the power control terminal of mechanism's box, connection that data transmission terminal is convenient to data line, measurement data carries out analyzing to PC end by data transmission terminal fast transport, computing and process.
Described digital magnetic field intensity measuring mechanism shows magnetic field intensity measuring instrument main frame by a high accuracy number and forms with the hall probe being placed in magnetic system core center.High accuracy number magnetic field intensity measuring instrument has peak value lock function, magnetic field space temperature display function, many unit of magnetic field strength Presentation Function and automatically relative/Absolute geomagnetic field calibration function, hall probe built-in temperature induction original paper, Real-Time Monitoring magnetic field space ambient temperature value, and real-time Data Transmission is held to PC.
Described sample suspender is made up of coupling arrangement and sample loader, and this coupling arrangement and sample loader adopt macromolecule polymeric material to make, and do not affect, avoid the impact of sample loader own material on measurement result to space magnetic field environment.
The built-in 380V ac power input end of described electrical control gear, self-shield air gap switch, AC transformer, electric rectification module, digital magnetic field intensity measuring instrument, remote control module and analog voltage transport module, external excitation con-trol button, demagnetization control knob, status indicator lamp, scene/remote control switch, magnetic field intensity hand regulator and synchronization parameter digital display screen; Circular arc field coil input ceiling voltage is the DC voltage of 120V, and controlling circular arc field coil maximum current is 12.0A, and magnetic field intensity reaches as high as 2.0T, ensure that the variable magnetic field intensity measured needed for specific susceptibility.
Described automatic measuring software system can automatic calibration magnetic field intensity, automatic control figure measuring mechanism, automatic control figure magnetic field intensity measuring mechanism, automatic collection real time data, automatic display measurement result, automatic drafting coordinate diagram picture, wherein automatically measuring software system is connected by RS2332 serial ports or usb data connects Long-distance Control and transmitting digital information, the each port communication state of automatic measuring software system interface simultaneous display, digital measurement mechanism real time data, test environment temperature, Testing of specific susceptibility result, magnetic field intensity-specific susceptibility, the direct coordinate diagram picture of magnetic field intensity-specific magnetization plane, automatic measuring software system can selectivity export, printing test file and test report.
Adopt the present invention of technique scheme compared with prior art, can directly and automatic mensuration material specific susceptibility, Testing of specific susceptibility value precision can up to 1.0 × 10
-9m
3/ kg, Ci Xi mechanism is manual adjustable circular arc field coil design, and the multiregion that can adapt to ferromagnetic substance, weak magnetic substance and non-magnetic material measures; The control of magnetic field intensity and adjustment are divided into electrical control gear manual adjustments and software systems automatically to regulate two kinds of modes, can be suitable for the Testing of specific susceptibility under multiple environment; Digital measurement mechanism and magnetic field intensity measuring mechanism adopt digital high accuracy data transmission technology, instead of the manual count of specific susceptibility determinator device in the past and manual compute mode, shorten the test period of existing relevant device.The present invention is low to test material conditions dictate degree, and test substances state can be divided into liquid and Powdered; Compared with existing relevant device, this instrument price is cheap; With VSM series, the serial vibrating sample magnetometer of BHV compares with simple and easy specific susceptibility determinator, mechanical type magnetic balance, and the present invention is simple and easy-operating determining instrument can generally be applied to related scientific research mechanism, Scientific Research in University Laboratory etc. as structure.
Accompanying drawing illustrates:
Fig. 1, Fig. 2, Fig. 3 are structural representations of the present invention.
Embodiment:
Below in conjunction with drawings and Examples in detail the present invention is described in detail:
A kind of specific susceptibility determinator, comprises low electromagnetism excitation system 25, measures bracing or strutting arrangement 11, digital measurement mechanism 2, digital magnetic field intensity measuring mechanism 33, sample suspender 3, electrical control gear 35 and automatic measuring software system.
Described electromagnetism excitation system 25 is fixedly made up of magnetic system seat 16, multifunctional universal castor 17, magnetic conduction jaw 12, circular arc field coil 5, circular arc field core 4, magnetic system Rapid adjustment mechanism 6 and level meter 14.Wherein, magnetic system seat 16 is empty van formula magnetic system seat, the design of empty van formula decreases instrument own wt on the one hand, reserve gadget parking space on the other hand, circular arc field coil 5 terminal block is built in magnetic system seat empty van, power lead input hole 7 designs the both sides at magnetic system seat-box body respectively, can select inlet wire input hole according to power lead orientation; Multifunctional universal castor 17 adopts the convenient design moved and be easy to Level tune and combine, multifunctional universal castor 17 is equipped with liftable supporting seat, during Mobile electromagnetic excitation system 25, supporting seat is risen, when Motionless electromagnetic excitation system 25 regulates magnetic system level, regulate electromagnetism excitation system 25 level by regulating the multifunctional universal castor 17 supporting seat hydrous water level 14 be arranged on bottom magnetic system seat 16; Magnetic conduction jaw 12 is closed to be fixed on magnetic system seat 16, selects the magnetic conductive material of super-magnetic conducting performance, substantially reduces the leakage field of magnetic field space; Circular arc field coil 5 realizes from cooling heat dissipation, and temperature rise up to 100 DEG C, can ensure that the stability of highfield lower coil functional performance; Circular arc field core 4 adopts Central Symmetry annulus corner cut formula field core to design, while achieving the high magnetic field intensity needed for Accurate Measurement material specific susceptibility, ensure that circular arc magnetic architecture produces higher magnetic field gradient, circular arc field core 4 angle scope of design is at 15 ° ~ 45 °, this angular range in turn ensure that the magnetic field gradient of sample space magnetic field environment while ensure that the required magnetic field intensity of test, the process of circular arc field core 4 plating zinc on surface, effectively avoids the problem affecting serviceability because it gets rusty; Magnetic system Rapid adjustment mechanism 6 is made up of iron core tubular shaft, rotary handle 15, circular arc field core 4 is fixed on iron core tubular shaft by key fit system, by gland, tubular shaft inside is closed, regulate rotary handle 15, can quick adjustment circular arc field core 4 spacing, realize manually, significantly control Testing of specific susceptibility requisite space magnetic field intensity and magnetic field gradient.
Described digital measurement mechanism 2 comprises power supply and the data transmission terminal 20 that the high accuracy number being built in digital measurement mechanism 2 is measured movement 21, digital circuit board 22 and is placed on digital measurement mechanism 2, wherein high accuracy number measures the mass change that movement 21 can detect 0.0001g, be placed on the connection that the power supply of digital measurement mechanism and data transmission terminal 20 are convenient to data line, measurement data carry out analyzing to PC end by data transmission terminal fast transport, computing and process.
Described corner, measurement bracing or strutting arrangement 11 bottom is installed with the same multifunctional universal castor 17 of magnetic system base, two item functions that are mobile and adjustment level can be realized, measure the high precision XY axial coordinate regulating device 9 that bracing or strutting arrangement 11 upper face installs digital measurement mechanism 2, high-precision Z-axis micromatic setting 1 and level meter 23 are formed, wherein digital measurement mechanism 2 is positioned among the moving track 24 of digital measurement mechanism, be convenient to significantly move forward and backward digital measurement mechanism 2, 4 horizontal adjustment knob 10 are provided with in moving track, with level meter 23 with the use of, for regulating measuring mechanism level.
Described digital measurement mechanism 2 comprises the high accuracy number being built in measuring mechanism and measures movement 21, digital circuit board 22 and be placed on the data transmission terminal 20 of mechanism, numerical information to be held to PC by data transmission terminal 20 fast transport carry out analyzing, computing and process.
Described digital magnetic field intensity measuring mechanism is made up of a high accuracy number magnetic field intensity measuring instrument 33 and the hall probe 18 being placed in circular arc field core 4, and wherein digital magnetic field intensity measuring instrument 33 is built in electrical control gear 35 for saving space.High accuracy number magnetic field intensity measuring instrument 33 has peak value lock function, magnetic field space temperature display function, many unit of magnetic field strength Presentation Function and automatically relative/Absolute geomagnetic field calibration function, hall probe 18 built-in temperature induction original paper, Real-Time Monitoring magnetic field space ambient temperature value, PC end can control and regulate digital magnetic field intensity measuring mechanism and collected numerical information is transferred to PC end by serial communication end.
Described sample suspender 3 comprises coupling arrangement 41 and sample loader 13, macromolecule polymeric material is all adopted to process for alleviating himself weight, simultaneously, macromolecule polymeric material does not affect space magnetic field environment, at utmost avoids the impact of sample loader own material on measurement result.
Described electrical control gear 35 is by built-in 380V ac power input end 39, self-shield air gap switch 34; AC transformer 40, electric rectification module 38, remote control module 37, analog voltage transport module 36 and digital magnetic field intensity measuring instrument 33, external excitation con-trol button 30, demagnetization control knob 31, magnetic field intensity hand regulator 32, synchronization parameter digital display screen, long-range/field control switch 25, status indicator lamp are formed.Synchronization parameter digital display screen is made up of voltage display screen 27 and electric current display screen 26.Status indicator lamp is made up of excitation pilot lamp 29 and demagnetization pilot lamp 28.Circular arc field coil 5 input voltage is 120V DC voltage, and controlling circular arc field coil 5 maximum current is 12.0A, ensure that and measures variable magnetic field intensity needed for specific susceptibility and magnetic field gradient; When closed self-shield air gap switch 34; electrical control gear 35 starts; when pressing excitation con-trol button 30; realize excitation turn-on power loss; now excitation pilot lamp 29 is lighted; when pressing demagnetization button 31; control circular arc field coil 5 to demagnetize; the pilot lamp 28 that now demagnetizes is lighted; long-range/field control switch 25 can realize on-the-spot freely switching with distance control mode; pass through when measuring specific susceptibility under on-site manual pattern to regulate magnetic field intensity hand regulator 32 easily can realize the size of current of coil, and then realize the manual adjustments of magnetic field intensity.
Described automatic measuring software system can automatic calibration magnetic field intensity, automatic control figure measuring mechanism, automatic control figure magnetic field intensity measuring mechanism, automatic collection real time data, automatic display measurement result, automatic drafting coordinate diagram picture, wherein automatically measuring software system is connected by RS2332 serial ports or usb data connects Long-distance Control and transmitting digital information, automatic measuring software system can set test model, change of magnetic field strength scope, magnetic field intensity regulates step-length automatically, flux control precision is at interior test parameter, the each port communication state of interface simultaneous display, digital measurement mechanism real time data, test environment temperature, Testing of specific susceptibility result, magnetic field intensity-specific susceptibility, magnetic field intensity-specific magnetization planimetric rectangular coordinates image, automatic measuring software system can selectivity export, printing test file and test report.
Described specific susceptibility determinator measures the method for material specific susceptibility, and step is as follows:
1. connect all installation's power sources, connect data line by regulation, install automatic measuring software system at PC end.
2. closed self-shield air gap switch 34, digital measurement mechanism 2, digital magnetic field intensity measuring mechanism 35 switch, open automatic measurement system.
3. calibrate digital measurement mechanism 2, digital magnetic field intensity measuring mechanism 35 on request, adjust the spacing of circular arc field coil 5 by mensuration requirement, under software systems, automatically carry out Magnetic control correction.
4. automatically measure the empty sample loader quality of sealing under software systems, take off sample loader by rotary sample suspender, dress is got and has been produced testing sample, installs back sample suspender after sealing.
5. under software systems, the full sample loader quality of automatic measurement, after to be measured, arrange by Testing of specific susceptibility requirement comprise test model, test condition that change of magnetic field strength scope, magnetic field intensity regulate step-length, flux control precision automatically, start after being provided with to measure.
6. under software systems, automatic working sample specific susceptibility, preserves determination data, test pattern, exports detailed ratio magnetization measurement result report.
Claims (4)
1.
a kind ofspecific susceptibility determinator, comprise electromagnetism excitation system, measure bracing or strutting arrangement, digital measurement mechanism, numeral magnetic field intensity measuring mechanism, sample suspender, electrical control gear and automatic measuring software system, it is characterized in that: described electromagnetism excitation system is by magnetic system seat, multifunctional universal castor, magnetic conduction jaw, circular arc field coil, circular arc field core, magnetic system Rapid adjustment mechanism and level meter are formed, multifunctional universal castor is installed in described corner, measurement bracing or strutting arrangement bottom, upper face installs the coordinate regulating device of digital measurement mechanism and the moving track of digital measurement mechanism, described digital measurement mechanism comprises the digital measurement movement, the digital circuit board that are built in measuring mechanism and is placed on power supply and the data transmission terminal of measuring mechanism, numeral magnetic field intensity measuring mechanism is made up of a high accuracy number magnetic field intensity measuring instrument and the self calibration hall probe being placed in magnetic system core center, described sample suspender is made up of coupling arrangement and sample loader, described electrical control gear built-in field power supply input end, self-shield air gap switch, AC transformer, electric rectification module, digital magnetic field intensity measuring instrument, remote control module and analog power output module, external excitation con-trol button, demagnetization control knob, status indicator lamp, long-range/on-the-spot collection control switch, magnetic field intensity hand regulator and synchronization parameter digital display screen, described automatic measuring software system can automatic calibration magnetic field intensity, automatically control figure measuring mechanism, automatically control figure magnetic field intensity measuring mechanism, automatically gather real time data, automatically display measurement result, automatically draw coordinate diagram picture, realize the automatic measurement of material specific susceptibility and generate complete determination report.
2. specific susceptibility determinator according to claim 1, it is characterized in that: the design that magnetic architecture adopts Central Symmetry annulus corner cut formula field core to combine with circular arc field coil, provide the high magnetic field gradients gradH needed for material Testing of specific susceptibility, wherein the annular center corner cut number of degrees are generally 15 ~ 45 °, provide the space magnetic field intensity that material specific susceptibility is accurately measured.
3. specific susceptibility determinator according to claim 1, it is characterized in that: the regulating and control of electromagnetism excitation system, digital measurement mechanism, the control of numeral magnetic field intensity measuring mechanism and data are transmitted and the setting of test parameter holds automatic measuring software system to complete by PC, test model can be set, change of magnetic field strength scope, magnetic field intensity regulates step-length automatically, flux control precision is at interior test parameter, export magnetic field intensity, specific susceptibility, specific susceptibility mean value, specific magnetization, the mensuration report of specific susceptibility change planimetric rectangular coordinates image and electrical file form.
4. a specific susceptibility determinator according to claim 1 measures the method for specific susceptibility, step is as follows: open all installation's power source systems, PC holds automatic measurement system, carry out magnetic field intensity correction by software prompt operation, test parameters sets, empty sample loader is measured automatically, full sample loader is measured automatically, start Testing of specific susceptibility test, software system interface simultaneous display test result, magnetic field intensity-specific susceptibility, magnetic field intensity-specific magnetization relation planimetric rectangular coordinates image and the report of complete Testing of specific susceptibility.
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| CN109118536A (en) * | 2017-06-23 | 2019-01-01 | 卡西欧计算机株式会社 | Data processing method, data processing equipment and storage medium |
| CN109655771A (en) * | 2017-10-11 | 2019-04-19 | 中国科学院物理研究所 | Ac magnetic susceptibility measuring device and its measurement method |
| CN110058183A (en) * | 2019-05-16 | 2019-07-26 | 华北电力大学 | A kind of extracting method of aperture magnetic polarization coefficient |
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