CN1710441A - Apparatus and method for measuring electromagnetic characteristic variation of material - Google Patents
Apparatus and method for measuring electromagnetic characteristic variation of material Download PDFInfo
- Publication number
- CN1710441A CN1710441A CN 200510043407 CN200510043407A CN1710441A CN 1710441 A CN1710441 A CN 1710441A CN 200510043407 CN200510043407 CN 200510043407 CN 200510043407 A CN200510043407 A CN 200510043407A CN 1710441 A CN1710441 A CN 1710441A
- Authority
- CN
- China
- Prior art keywords
- signal
- secondary winding
- iron core
- winding
- coil
- 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
Images
Abstract
Two sets of rectifying and filtering units are adopted to process the measurement signal outputted from a signal output end of coil. Then, subtracter is utilized to carry out subtraction operation for two routes of signal processed. After signal is input into computer, specific treatment is carried out by software so as to output chart between electromagnetic properties and temperature of sample varied with time. Futures are: simple structure, low cost, easy of use, wide suitable range and high measuring accuracy. The invention is able to determine monotonicity of varied electromagnetic properties of material, and suitable to measuring liquid metal.
Description
Technical field
The invention belongs to field of measuring technique, particularly a kind of ultimate principle of electromagnetic induction of utilizing is measured the devices and methods therefor that the material electromagnetic property changes.
Background technology
The main method of magnetic character such as the magnetic susceptibility of current measurement of species has faraday's method (Faraday Method) and electromagnetic induction method (Induction Method) etc.
The electromagnetic induction method is to utilize the ultimate principle of electromagnetic induction, measures electric current or the voltage inducted in inductive coil in magnetic field, and then calculates the size of the magnetic susceptibility of sample.(vibrating sample magnetometer VSM), exchanges magnetometer (AC Susceptometer) to vibrating sample magnetometer, and superconducting quantum interference device (SQUID) equipment such as (SQUID magnetometers) is the application example of this method.Above mentioned several device and using method thereof are used for the scientific experiment work in laboratory mostly, the instrument precision, and the cost costliness, restriction is a lot of in the use.Application number is that 031124739 Chinese patent discloses method of testing and the device thereof that a kind of material electromagnetic property changes, adopted the ultimate principle of electromagnetic induction method, may further comprise the steps: specimen preparation, magnetic circuit assembling, circuit connects and debugging, measures and data recording; And a kind of isolated plant based on above-mentioned material electromagnetic property method of testing, adopt the differential winding of C shape iron core and corresponding surveying instrument to form by two; This invention is with low cost, easy to use, applied widely, is particularly useful for the measurement that the liquid metal electromagnetic property changes, but still has the problem of the monotonicity that can not judge in the measuring process that the material electromagnetic property changes.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of electromagnetic property easy to use, with low cost, that can in measuring process, judge material to change measurement mechanism and the measuring method thereof that material electromagnetic property monotonicity, applied widely changes.
The present invention realizes in the following manner:
A kind of device of measuring the variation of material electromagnetic property: comprise signal generator, computing machine, elementary winding I, elementary winding II, secondary winding I, secondary winding II, C shape iron core I, C shape iron core II; Elementary winding I, secondary winding I, C shape iron core I form the measurement coil, and elementary winding II, secondary winding II, C shape iron core II form reference coil; During winding technique, adopt the concentric type structure, elementary winding is wrapped on the iron core interior, and secondary winding is wrapped on the elementary winding outside, and two windings are around to identical; The secondary winding number of turn is greater than the number of turn of elementary winding; The output terminal of elementary winding I links to each other with the input end of elementary winding II, and the output terminal of the input end of elementary winding I and elementary winding II is formed signal input part; It is characterized in that: also comprise straightening and filtering unit I, straightening and filtering unit II, subtracter, analog-digital commutator I, analog-digital commutator II; Secondary winding I input end links to each other with the input end of secondary winding II, receives signal ground, and the output terminal of the output terminal of secondary winding I and secondary winding II is formed signal output part; The output terminal of signal generator is connected to the signal input part of coil, the output terminal of secondary winding I is received straightening and filtering unit I input end, the output terminal of secondary winding II is received the signal input part of straightening and filtering unit II, the signal output part of the signal output part of straightening and filtering unit I and straightening and filtering unit II is received the signal input part of subtracter, the signal output part of subtracter is received the signal input part of analog-digital commutator II, and the signal output part of analog-digital commutator II is received computing machine; The signal output part of temperature measuring equipment is received the signal input part of analog-digital commutator I, and the signal output part of analog-digital commutator II is received computing machine.
A kind of method of testing that changes based on the material electromagnetic property of said apparatus, according to when the sample in the magnetic circuit when the electromagnetic property of itself changes, the principle that the output signal of whole magnetic circuit changes, by the measuring basis coil with measure the difference of coil output signal, and then learn the variation of the electromagnetic property of sample own; May further comprise the steps:
1) specimen preparation: cleaning, weighing testing sample, under the protection of inert gas, testing sample is heated to fusing, mix, be cooled to room temperature again;
2) magnetic circuit assembling: use two and all adopt C shape iron core, and material, umber of turn, winding are around to identical coil, as measuring coil and reference coil, wherein, measuring coil is made up of elementary winding I, secondary winding I, C shape iron core I, reference coil is made up of elementary winding II, secondary winding II, C shape iron core II, to place the breach of the C shape iron core of measuring coil by the testing sample that step 1) is made, authentic specimen is placed the breach of the C shape iron core of reference coil, make magnetic circuit pass through testing sample fully;
3) circuit connects and debugging: energized, and the opening signal generator, the conditioning signal generator produces suitable sinusoidal ac signal and is input to signal input part, begins debugging;
4) measurement and data recording: clean again, weighing is by the testing sample of step 1) preparation, prepare a resistant to elevated temperatures container, as quartz glass tube, measure its geomery, testing sample is contained in the resistant to elevated temperatures container, use Efco-Northrup furnace that testing sample is heated to fusing fully then, again the testing sample of fusion is put into the breach of the C shape iron core of measuring coil with container, adopt insulation such as aluminium oxide insulating brick or zirconia insulating brick and mica paper and heat-barrier material heat insulation between container and iron core, use signal generator generation sinusoidal ac signal, the signal input part that input is made up of the output terminal of the input end of elementary winding I and elementary winding II begins to measure and record data;
It is characterized in that the step 3) circuit connects and the detailed process of debugging comprises: when authentic specimen is in the breach of C shape iron core of reference coil, when the testing sample of being made by step 1) is in the breach of the C shape iron core of measuring coil, regulate the zero potentiometer above the straightening and filtering unit I, the signal that makes computer acquisition is zero, take out testing sample then, regulate the enlargement ratio regulator potentiometer on the subtracter, the signal that makes computer acquisition is forward maximum or negative sense maximum, i.e. maximum range place; Take out sample; Step 4) is measured and the process of record data is: after the signal output part that signal is formed from the output terminal of secondary winding I and the output terminal of secondary winding II is exported, pass through straightening and filtering unit I and straightening and filtering unit II rectifying and wave-filtering respectively, the subtraction of subtracter and processing and amplifying, the analog to digital conversion of analog-digital commutator is connected to Computer Storage again; Simultaneously, the serviceability temperature measurement mechanism is measured and the record sample temperature, deal with data, output measuring-signal and the time dependent chart of temperature.
The present invention is owing to adopted two cover straightening and filtering units to handle from the measuring-signal of the signal output part output of coil, try to achieve processing and amplifying after the difference of two paths of signals by subtracter then, thereby the monotonicity when making the present invention can determine the variation of material electromagnetic property, be applicable to the measurement that the liquid metal electromagnetic property changes, can access the electromagnetic property and the time dependent curve of temperature of liquid metal.
Description of drawings
Fig. 1 is a theory structure synoptic diagram of the present invention,
Fig. 2 is the coiling synoptic diagram of winding of the present invention,
Fig. 3 is the electromagnetic property of an aluminium nickel and temperature state trend graph in time,
Fig. 4 is the electromagnetic property and the temperature state trend graph in time of copper tin.
Among the figure: 1 signal generator, 2 temperature measuring equipments, 3 analog-to-digital conversion module I, 4 computing machines, 5 analog-to-digital conversion module II, 6 subtracters, 7 straightening and filtering units, 8 secondary winding I, 9 iron core I, 10 testing samples, 11 elementary winding I, 12 elementary winding II, 13 authentic specimens, 14 iron core II, 15 secondary winding II, 16 straightening and filtering unit II
Embodiment:
Provide two most preferred embodiments of the present invention below:
Measurement mechanism:
◆ circuit and magnetic circuit are assembled with the following methods: elementary winding I[11] output terminal and elementary winding II[12] input end link to each other elementary winding I[11] input end and elementary winding II[12] output terminal form signal input part; Secondary winding I[8] input end and secondary winding II[15] input end link to each other, receive signal ground, secondary winding I[8] output terminal and secondary winding II[15] output terminal form signal output part; The output terminal of AG253 signal generator [1] is connected to the signal input part of coil, secondary winding I[8] output terminal receive straightening and filtering unit I[7] signal input part, secondary winding II[15] output terminal receive straightening and filtering unit II[16] signal input part, straightening and filtering unit I[7] signal output part and straightening and filtering unit II[16] signal output part receive the signal input part of subtracter [6], the signal output part of subtracter [6] is received analog-digital commutator II[5] signal input part, analog-digital commutator II[5] signal output part receive computing machine [4]; The signal output part of Raynger 3i temperature measuring equipment [2] is received analog-digital commutator I[3] signal input part, analog-digital commutator II[5] signal output part receive computing machine [4]; During winding technique, elementary winding is interior, secondary winding outside, two windings are around to identical, elementary winding 200 circles, secondary winding 1000 circles; Iron core internal diameter 70mm, external diameter 100mm, thickness are 15mm, gap width is 30mm.
Measuring process:
◆ specimen preparation: cleaning, weighing metallic aluminium 3.95g and metallic nickel 2.86g sample.Under the protection of argon gas, be heated to fusing, mix, be cooled to room temperature again;
◆ magnetic circuit assembling: aluminium nickel sample to be measured is placed the breach of the C shape iron core of measuring coil, make magnetic circuit fully by aluminium nickel sample to be measured, test this time adopts air as authentic specimen, so at laissez-faire what object of the indentation, there of the C of reference coil shape iron core;
◆ circuit connects and debugging: energized, open the AG253 signal generator, regulate the AG253 signal generator, produce suitable sinusoidal ac signal and be input to signal input part, when the testing sample of being made by step 1) [10] is in the breach of the C shape iron core of measuring coil, regulate straightening and filtering unit I[7] top zero potentiometer, the signal that makes computer acquisition is zero, take out testing sample then, regulate the enlargement ratio regulator potentiometer on the subtracter [6], the signal that computing machine [4] is gathered is forward maximal value or maximum negative value place, i.e. maximum range place.Take out sample.
◆ measure and data recording: clean, weighing aluminium nickel sample, measure the diameter of quartz glass test tube, it is contained in the resistant to elevated temperatures quartz glass test tube, use Efco-Northrup furnace to be heated to fusing fully then, again the aluminium nickel sample of fusion is put into the breach of the C shape iron core of measuring coil with container, use aluminium oxide insulating brick and mica paper heat insulation between test tube and iron core, use the AG253 signal generator that the sinusoidal ac signal of 1000Hz takes place, input is by elementary winding I[11] input end and elementary winding II[12] the signal input part formed of output terminal, when signal from secondary winding I[8] output terminal and secondary winding II[15] the signal output part output formed of output terminal after, pass through straightening and filtering unit I[7 respectively] and straightening and filtering unit II[16] rectifying and wave-filtering, the subtraction and the processing and amplifying of subtracter [6], the analog to digital conversion of analog-digital commutator [5] is connected to computing machine [4] storage again; Simultaneously, use the portable infrared thermography instrument of Raynger3i [2] to measure and record aluminium nickel sample temperature; Data processing, output measuring-signal and the time dependent chart of temperature, test result is as shown in Figure 3.
Measurement mechanism:
◆ circuit and magnetic circuit are assembled with the following methods: elementary winding I[11] output terminal and elementary winding II[12] input end link to each other elementary winding I[11] input end and elementary winding II[12] output terminal form signal input part; Secondary winding I[8] input end and secondary winding II[15] input end link to each other, receive signal ground, secondary winding I[8] output terminal and secondary winding II[15] output terminal form signal output part; The output terminal of AG253 signal generator [1] is connected to the signal input part of coil, secondary winding I[8] output terminal receive straightening and filtering unit I[7] signal input part, secondary winding II[15] output terminal receive straightening and filtering unit II[16] signal input part, straightening and filtering unit I[7] signal output part receive the signal input part of subtracter [6], straightening and filtering unit II[16] signal output part receive the signal input part of subtracter [6], the signal output part of subtracter [6] is received analog-digital commutator II[5] signal input part, analog-digital commutator II[5] signal output part receive computing machine [4]; The signal output part of Raynger 3i temperature measuring equipment [2] is received analog-digital commutator I[3] signal input part, analog-digital commutator II[5] signal output part receive computing machine [4]; During winding technique, elementary winding is interior, secondary winding outside, two windings are around to identical, elementary winding 200 circles, secondary winding 1000 circles; Iron core internal diameter 70mm, external diameter 100mm, thickness are 15mm, gap width is 30mm.
Measuring process:
◆ specimen preparation: cleaning, weighing metallic copper 15.11g and metallic tin 9.89g sample.Under the protection of argon gas, be heated to fusing, mix, be cooled to room temperature again;
◆ magnetic circuit assembling: copper tin sample to be measured is placed the breach of the C shape iron core of measuring coil, make magnetic circuit fully by copper tin sample to be measured, test this time adopts air as authentic specimen, so at laissez-faire what object of the indentation, there of the C of reference coil shape iron core;
◆ circuit connects and debugging: energized, open the AG253 signal generator, regulate the AG253 signal generator, produce suitable sinusoidal ac signal and be input to signal input part, when the testing sample of being made by step 1) [10] is in the breach of the C shape iron core of measuring coil, regulate straightening and filtering unit I[7] top zero potentiometer, the signal that makes computer acquisition is zero, take out testing sample then, regulate the enlargement ratio regulator potentiometer on the subtracter [6], the signal that computing machine [4] is gathered is forward maximal value or maximum negative value place, i.e. maximum range place.Take out sample.
◆ measure and data recording: clean, weighing copper tin sample, measure the diameter of quartz glass test tube, it is contained in the resistant to elevated temperatures quartz glass test tube, use Efco-Northrup furnace to be heated to fusing fully then, again the copper tin sample of fusion is put into the breach of the C shape iron core of measuring coil with container, use aluminium oxide insulating brick and mica paper heat insulation between test tube and iron core, use the AG253 signal generator that the sinusoidal ac signal of 1000Hz takes place, input is by elementary winding I[11] input end and elementary winding II[12] the signal input part formed of output terminal, when signal from secondary winding I[8] output terminal and secondary winding II[15] the signal output part output formed of output terminal after, pass through straightening and filtering unit I[7 respectively] and straightening and filtering unit II[16] rectifying and wave-filtering, the subtraction and the processing and amplifying of subtracter [6], the analog to digital conversion of analog-digital commutator [5] is connected to computing machine [4] storage again; Simultaneously, use the portable infrared thermography instrument of Raynger3i [2] to measure and record copper tin sample temperature; Data processing, output measuring-signal and the time dependent chart of temperature, test result is as shown in Figure 4.
Claims (2)
1. measure the device that the material electromagnetic property changes for one kind: comprise signal generator [1], computing machine [4], elementary winding I[11], elementary winding II[12], secondary winding I[8] and, secondary winding II[15], C shape iron core I[9] and, C shape iron core II[14]; Elementary winding I[11], secondary winding I[8], C shape iron core I[9] form to measure coil, elementary winding II[12], secondary winding II[15], C shape iron core II[14] form reference coil; During winding technique, adopt the concentric type structure, elementary winding is wrapped on the iron core interior, and secondary winding is wrapped on the elementary winding outside, and two windings are around to identical; The secondary winding number of turn is greater than the number of turn of elementary winding; Elementary winding I[11] output terminal and elementary winding II[12] input end link to each other elementary winding I[11] input end and elementary winding II[12] output terminal form signal input part; It is characterized in that: also comprise straightening and filtering unit I[7], straightening and filtering unit II[16], subtracter [6], analog-digital commutator I[3], analog-digital commutator II[5]; Secondary winding I[8] input end and secondary winding II[15] input end link to each other, receive signal ground, secondary winding I[8] output terminal and secondary winding II[15] output terminal form signal output part; The output terminal of signal generator [1] is connected to the signal input part of coil, secondary winding I[8] output terminal receive straightening and filtering unit I[7] input end, secondary winding II[15] output terminal receive straightening and filtering unit II[16] signal input part, straightening and filtering unit I[7] signal output part and straightening and filtering unit II[16] signal output part receive the signal input part of subtracter [6], the signal output part of subtracter [6] is received analog-digital commutator II[5] signal input part, analog-digital commutator II[5] signal output part receive computing machine [4]; The signal output part of temperature measuring equipment is received analog-digital commutator I[3] signal input part, analog-digital commutator II[5] signal output part receive computing machine [4].
2. method of testing that changes based on the material electromagnetic property of the described device of claim 1, according to when the sample in the magnetic circuit when the electromagnetic property of itself changes, the principle that the output signal of whole magnetic circuit changes, by the measuring basis coil with measure the difference of coil output signal, and then learn the variation of the electromagnetic property of sample own; May further comprise the steps:
1) specimen preparation: cleaning, weighing testing sample, under the protection of inert gas, testing sample is heated to fusing, mix, be cooled to room temperature again;
2) magnetic circuit assembling: use two and all adopt C shape iron core, and material, umber of turn, winding are around to identical coil, as measuring coil and reference coil, wherein, measure coil by elementary winding I[11], secondary winding I[8], C shape iron core I[9] form, reference coil is by elementary winding II[12], secondary winding II[15], C shape iron core II[14] form, to place the breach of the C shape iron core of measuring coil by the testing sample that step 1) is made, authentic specimen is placed the breach of the C shape iron core of reference coil, make magnetic circuit pass through testing sample fully;
3) circuit connects and debugging: energized, and opening signal generator [1], conditioning signal generator [1] produces suitable sinusoidal ac signal and is input to signal input part, begins debugging;
4) measurement and data recording: clean again, weighing is by the testing sample of step 1) preparation, prepare a resistant to elevated temperatures container, as quartz glass tube, measure its geomery, testing sample is contained in the resistant to elevated temperatures container, use Efco-Northrup furnace that testing sample is heated to fusing fully then, again the testing sample of fusion is put into the breach of the C shape iron core of measuring coil with container, adopt insulation such as aluminium oxide insulating brick or zirconia insulating brick and mica paper and heat-barrier material heat insulation between container and iron core, use signal generator [1] that sinusoidal ac signal takes place, input is by elementary winding I[11] input end and elementary winding II[12] the signal input part formed of output terminal, begin to measure and record data;
It is characterized in that the step 3) circuit connects and the detailed process of debugging comprises: when authentic specimen is in the breach of C shape iron core of reference coil, when the testing sample of being made by step 1) is in the breach of the C shape iron core of measuring coil, regulate straightening and filtering unit I[7] top zero potentiometer, the signal that computing machine [4] is gathered is zero, take out testing sample then, regulate the enlargement ratio regulator potentiometer on the subtracter [6], the signal that computing machine [4] is gathered is forward maximum or negative sense maximum, i.e. maximum range place; Take out sample; Step 4) is measured and the process of record data is: when signal from secondary winding I[8] output terminal and secondary winding II[15] the signal output part formed of output terminal export after, pass through straightening and filtering unit I[7 respectively] and straightening and filtering unit II[16] rectifying and wave-filtering, the subtraction and the processing and amplifying of subtracter [6], the analog to digital conversion of analog-digital commutator is connected to computing machine [4] storage again; Simultaneously, the serviceability temperature measurement mechanism is measured and the record sample temperature, deal with data, output measuring-signal and the time dependent chart of temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510043407 CN1710441A (en) | 2005-04-30 | 2005-04-30 | Apparatus and method for measuring electromagnetic characteristic variation of material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510043407 CN1710441A (en) | 2005-04-30 | 2005-04-30 | Apparatus and method for measuring electromagnetic characteristic variation of material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1710441A true CN1710441A (en) | 2005-12-21 |
Family
ID=35706708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510043407 Pending CN1710441A (en) | 2005-04-30 | 2005-04-30 | Apparatus and method for measuring electromagnetic characteristic variation of material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1710441A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101401134B (en) * | 2006-03-07 | 2010-09-29 | 豪尔赫·何塞·古维亚·阿布伦霍萨 | Device and process for magnetic material detection in electronic article surveillance (EAS) electromagnetic systems |
| CN102156006A (en) * | 2011-03-08 | 2011-08-17 | 华中科技大学 | Remote temperature measuring method of magnetic nano-particles based on paramagnetic property |
| CN107024668A (en) * | 2017-03-22 | 2017-08-08 | 金华职业技术学院 | A kind of method of magnetic characteristic of the measurement sample strip in joule heat treatment process |
| CN110471009A (en) * | 2018-05-11 | 2019-11-19 | 中国科学院宁波材料技术与工程研究所 | Wide temperature range magnetic flux temperature characteristic measuring device and method |
-
2005
- 2005-04-30 CN CN 200510043407 patent/CN1710441A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101401134B (en) * | 2006-03-07 | 2010-09-29 | 豪尔赫·何塞·古维亚·阿布伦霍萨 | Device and process for magnetic material detection in electronic article surveillance (EAS) electromagnetic systems |
| CN102156006A (en) * | 2011-03-08 | 2011-08-17 | 华中科技大学 | Remote temperature measuring method of magnetic nano-particles based on paramagnetic property |
| CN102156006B (en) * | 2011-03-08 | 2012-06-13 | 华中科技大学 | Remote temperature measuring method of magnetic nano-particles based on paramagnetic property |
| CN107024668A (en) * | 2017-03-22 | 2017-08-08 | 金华职业技术学院 | A kind of method of magnetic characteristic of the measurement sample strip in joule heat treatment process |
| CN107024668B (en) * | 2017-03-22 | 2023-09-26 | 金华职业技术学院 | Method for measuring magnetic characteristics of sample strip in Joule heat treatment process |
| CN110471009A (en) * | 2018-05-11 | 2019-11-19 | 中国科学院宁波材料技术与工程研究所 | Wide temperature range magnetic flux temperature characteristic measuring device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhu et al. | Two dimensional measurement of magnetic field and core loss using a square specimen tester | |
| CN1710441A (en) | Apparatus and method for measuring electromagnetic characteristic variation of material | |
| CN1212524C (en) | Soft magnetic material characteristic measuring devices | |
| CN205263287U (en) | Novel rotatory magnetic characteristic sensing device of two dimension high frequency | |
| CN106643587B (en) | A kind of thickness of metal film measurement method based on microwave transmission method | |
| CN1209623C (en) | Test method of material electromagnetic property change and its special equipment | |
| CN109799391A (en) | Conductor AC resistance measurement method, system and computer storage medium | |
| CN110967396B (en) | Giant magneto-impedance effect biomagnetic measuring device based on magnetic bead concentration and simulated lesion body shape | |
| CN101561466B (en) | Eddy conductivity measuring method | |
| CN204346974U (en) | A kind of pulse eddy current probe | |
| Cho et al. | Development of automatic inspection robot for live-line insulators | |
| CN207992272U (en) | A kind of universal low noise electrical measurement specimen holder | |
| Placko et al. | A focused-field eddy current sensor for nondestructive testing | |
| Godeke et al. | Characterization of high current RRP wires as a function of magnetic field, temperature, and strain | |
| CN210322623U (en) | High-precision creep fatigue crack propagation testing machine | |
| Hamajima et al. | A mechanism causing an additional AC loss in a large CICC coil | |
| Zhang et al. | A stress defect state measurement method based on low-frequency ACMFL excitation and Hall sensor array collection | |
| CN208520793U (en) | A kind of open nuclear magnetic resonance sensor | |
| CN208155906U (en) | A kind of electric-controlled type nmr sensor | |
| Liu et al. | Non-contact electrical resistivity measuring system based on BP neural network | |
| CN117347915A (en) | Finite element analysis-based copper-clad aluminum winding transformer detection method and system | |
| Quercia et al. | Nonlinear effects in new magnetic pickup coils for JET | |
| CN105067790A (en) | On-line test device and test method of superconductive wire rod Cu/Sc | |
| Feng et al. | A high-precision TMR sensor array system for detecting surface and internal defects in thin sheet of steel | |
| CN115616464A (en) | Detection coil calibration device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |