CN103576105A - High-sensitivity micro-area magnetic field intensity detection assembly - Google Patents
High-sensitivity micro-area magnetic field intensity detection assembly Download PDFInfo
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- CN103576105A CN103576105A CN201310501710.8A CN201310501710A CN103576105A CN 103576105 A CN103576105 A CN 103576105A CN 201310501710 A CN201310501710 A CN 201310501710A CN 103576105 A CN103576105 A CN 103576105A
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Abstract
The invention belongs to the technical field of material micro-area detection, and particularly relates to a micro-area magnetic field intensity detection assembly. The detection assembly comprises a magnetic field detection head made of magnetic resistance materials, a signal reading and amplifying and analog-digital converting circuit and a computer. The detection head made of the magnetic resistance materials detects micro-area magnetic field intensity signals and sends the micro-area magnetic field intensity signals into the signal reading and amplifying and analog-digital converting circuit, the micro-area magnetic field intensity signals are processed by the signal reading and amplifying and analog-digital converting circuit and sent into the computer to be analyzed and processed, and representation is carried out on the micro-area magnetization state and the magnetic field intensity and distribution of materials in an external magnetic field. The micro-area magnetic field intensity detection assembly can be used for conducting evaluation and the like on micro-area magnetism or a magnetic domain of the materials.
Description
Technical field
The invention belongs to material tiny area detection technique field, be specifically related to tiny area magnetic field intensity probe assembly.
Background technology
The present invention relates to the sign of the microcell magnetic field intensity of magnetic material and superconductor material.
There is the different tiny area of many atomic magnetic moment orientations in magnetic material inside: these microcell inside comprise a large amount of atoms, and its magnetic moment marshalling, direction are consistent; But the orientation of atomic magnetic moment there are differences between adjacent area, the different microcell of these magnetic moment orientations is called magnetic domain.Interface between magnetic domain is neticdomain wall.It is that result is cancelled out each other because the magnetic moment direction of its inner numerous magnetic domain is different that magnetic material does not show magnetic under macrostate, and vector is zero, as Fig. 1.Only have after magnetic material is magnetized, could externally demonstrate magnetic.
Along with the variation of the conditions such as temperature and external magnetic field, the inner magnetic domain of magnetic material and orientation thereof will produce corresponding variation.Under the dynamic condition that this assembly can outside magnetic field, temperature and sample current change, on micro-scale, observe distribution and the motion thereof of magnetic domain, characterize magnetic domain internal magnetic field intensity and micro Distribution.
Some material at a certain temperature resistance reduces to zero, and now the magnetic line of force all repels outside material bodies, has diamagnetic character completely, and this material is called superconductor.The temperature that changes superconducting state from the non-vanishing normal state of resistance into is called superconducting transition temperature or superconduction critical temperature, uses T
crepresent; In addition only have and be less than a certain value H when externally-applied magnetic field
cshi Caineng maintains supraconductivity, otherwise superconducting state will change normal state, H into
cbe called critical magnetic field strength; Strength of current in superconductor surpasses a certain value (being critical current) I
ctime, superconductor changes normal conductor into; No matter have or not external magnetic field while starting, only have T<T
c, superconductor becomes after superconducting state, and the magnetic induction density perseverance in body is zero, i.e. and superconduction physical efficiency is all repelled the magnetic line of force to external, has diamagnetism completely.When superconductor completes the phase transformation from normal phase to superconducting phase, the magnetic line of force in body can be excluded completely externally, become complete diamagnet, as shown in Figure 2.
According to the residing environment of material, superconductor can be in superconducting state or normal state, mixed state that also may be in two states.In this admixture, superconducting state changes according to the variation of external environment condition with the ratio regular meeting of normal state.The function of assembly of the present invention is exactly on micro-scale, to observe the distribution of superconducting phase and normal phase, and the changes in distribution producing with the change of external environment condition (temperature, magnetic field, electric current).
Summary of the invention
The object of the present invention is to provide a kind of distribution that can observe superconducting phase and normal phase on micro-scale, and the tiny area magnetic field intensity detection components of the changes in distribution producing with the change of external environment condition (temperature, magnetic field, electric current).
Tiny area magnetic field intensity detection components provided by the invention, based on magnetoresistance material, in microcosmic point, dynamically the distribution of magnetic field in material or magnetic domain is done to image conversion and characterize, provide a kind of use to utilize the detection of magnetic field assembly of magnetic susceptibility medium real-time characterization tiny area Distribution of Magnetic Field.The system of this assembly forms as shown in Figure 3, comprising: the detection of magnetic field original paper that magnetoresistance material forms, signal-obtaining, amplification and analog to digital conversion circuit, computing machine; Magnetoresistance material detecting head is surveyed tiny area magnetic field intensity signal, send into signal-obtaining, amplification and analog to digital conversion circuit, through signal-obtaining, amplification and analog to digital conversion circuit, process, signal is sent into computing machine, carry out analysis and the processing of signal, implement tiny area magnetized state, magnetic field intensity and distribution in material outside magnetic field to characterize.
Detection components of the present invention, when the sign distributing for material microcell magnetic field face, described material is two kinds of magnetic material and superconductor materials.For magnetic material, when the magnetic momente interaction of magnetoresistance material detecting head (magnetoresistive head) and magnetic domain, the resistance of magnetoresistive head itself will produce larger variation, and its variation can be read by the mode of current signal, can be by computer recording through amplification and analog-to-digital conversion.To the superconductor sample in uniform magnetic field, the distribution of superconducting phase while detecting its mixed state, at sample during in normal state, magnetic field can penetrate sample, and when it changes superconducting state into from normal state, sample produces shielding to magnetic field, and the magnetic field intensity that magnetoresistance material detecting head detects will produce significantly and decline, and the regional area that can differentiate thus sample has completed phase transformation.
In the present invention one preferably in embodiment, the large reluctance magnetic head that magnetoresistance material detecting element adopts commercially available hard disc of computer to adopt, reading of the control of magnetic head face surface sweeping campaign and signal adopts signals collecting and amplification circuit, and final record and analysis adopt special software and commercially available computing machine to process.
The present invention's raw material, reagent, equipment and accessory used be commercially available obtaining all.
In the present invention, above-mentioned each subsystem can combination in any on the basis that meets this area general knowledge, obtains the preferred embodiments of the invention.
Good effect of the present invention is:
1, utilize instrument of the present invention, can realize under dynamic temperature, magnetic field, current condition, the sign that the microcell face of superconducting phase-normal phase in the magnetic domain of magnetic material and superconductor is distributed.
2, high sensitivity microcell magnetic field intensity probe assembly of the present invention, is easy to build actual characterization device, and cost control is good.
The present invention can be used for the microcell magnetic of material or magnetic domain to assess etc.
Accompanying drawing explanation
Fig. 1. the magnetic moment direction of magnetic domain is different, and result is cancelled out each other, and vector is zero.
Fig. 2. when environment temperature is lower than Tc, superconductor becomes complete diamagnet, and magnetic field is excreted completely.
Fig. 3. the microcell magnetic field intensity detection components based on giant magnetic resistance probe forms schematic diagram.
Embodiment
The invention is further illustrated by the following examples.
Embodiment 1, adopts probe assembly of the present invention to practise physiognomy to distribute to the superconduction of superconductor and detects:
The large reluctance magnetic head that magnetoresistance material detecting element adopts commercially available hard disc of computer to adopt, reading of the control of magnetic head face surface sweeping campaign and signal adopts special signals collecting and the amplification circuit of researching and developing design, final record and analysis to adopt special software and commercially available computing machine to process.
Claims (1)
1. a tiny area magnetic field intensity detection components, is characterized in that comprising: the detection of magnetic field head that magnetoresistance material forms, signal-obtaining, amplification and analog to digital conversion circuit, computing machine; Magnetoresistance material detecting head is surveyed tiny area magnetic field intensity signal, send into signal-obtaining, amplification and analog to digital conversion circuit, through signal-obtaining, amplification and analog to digital conversion circuit, process, signal is sent into computing machine, carry out analysis and the processing of signal, implement tiny area magnetized state, magnetic field intensity and distribution in material outside magnetic field to characterize.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808158A (en) * | 2015-05-07 | 2015-07-29 | 李川 | Ferroxcube detector |
| CN105548347A (en) * | 2015-12-12 | 2016-05-04 | 中国科学院大学 | Method for detecting defects in conductor based on electromagnetic induction principle |
| CN104020425B (en) * | 2014-05-21 | 2016-09-21 | 宁波韵升股份有限公司 | The method detecting the anisotropy magnet steel direction of magnetization that do not magnetizes |
| CN111982122A (en) * | 2020-08-24 | 2020-11-24 | 苏州突维机器人有限公司 | Magnetic navigation sensor based on Hall sensor and detection method thereof |
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| US20040150396A1 (en) * | 1997-11-21 | 2004-08-05 | Simmonds Michael Bancroft | Method and apparatus for making measurements of accumulations of magnetically susceptible particles combined with analytes |
| CN101266286A (en) * | 2008-03-26 | 2008-09-17 | 中国科学院上海光学精密机械研究所 | Magnetic domain observation device |
| CN101788594A (en) * | 2010-01-08 | 2010-07-28 | 清华大学 | Non-contact type superconduction belt material critical current measuring device |
| CN201754180U (en) * | 2010-07-16 | 2011-03-02 | 华南理工大学 | Two-dimensional micromagnetometer probe |
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2013
- 2013-10-23 CN CN201310501710.8A patent/CN103576105A/en active Pending
Patent Citations (5)
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| US20040150396A1 (en) * | 1997-11-21 | 2004-08-05 | Simmonds Michael Bancroft | Method and apparatus for making measurements of accumulations of magnetically susceptible particles combined with analytes |
| CN1442703A (en) * | 2002-03-04 | 2003-09-17 | 爱知知的微技股份有限公司 | Magnetic detection device |
| CN101266286A (en) * | 2008-03-26 | 2008-09-17 | 中国科学院上海光学精密机械研究所 | Magnetic domain observation device |
| CN101788594A (en) * | 2010-01-08 | 2010-07-28 | 清华大学 | Non-contact type superconduction belt material critical current measuring device |
| CN201754180U (en) * | 2010-07-16 | 2011-03-02 | 华南理工大学 | Two-dimensional micromagnetometer probe |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020425B (en) * | 2014-05-21 | 2016-09-21 | 宁波韵升股份有限公司 | The method detecting the anisotropy magnet steel direction of magnetization that do not magnetizes |
| CN104808158A (en) * | 2015-05-07 | 2015-07-29 | 李川 | Ferroxcube detector |
| CN105548347A (en) * | 2015-12-12 | 2016-05-04 | 中国科学院大学 | Method for detecting defects in conductor based on electromagnetic induction principle |
| CN111982122A (en) * | 2020-08-24 | 2020-11-24 | 苏州突维机器人有限公司 | Magnetic navigation sensor based on Hall sensor and detection method thereof |
| CN111982122B (en) * | 2020-08-24 | 2023-09-29 | 苏州突维机器人有限公司 | Hall sensor-based magnetic navigation sensor and detection method thereof |
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Application publication date: 20140212 |