CN104992807A - Generation apparatus of rotary gradient magnetic field - Google Patents
Generation apparatus of rotary gradient magnetic field Download PDFInfo
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- CN104992807A CN104992807A CN201510299663.2A CN201510299663A CN104992807A CN 104992807 A CN104992807 A CN 104992807A CN 201510299663 A CN201510299663 A CN 201510299663A CN 104992807 A CN104992807 A CN 104992807A
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Abstract
A generation apparatus of rotary gradient magnetic field comprises two parts, one is magnetic field generating part and the other is magnetic field driving part, wherein the magnetic field generating part is constituted of two coil sets; the magnetic field driving part is constituted of a signal source and a power amplifier that are used for providing needed current the coil sets of the magnetic field generating part; the two coil sets of the magnetic field generating part are symmetric about a flat mirror; each of the coil sets is constituted of N coil units (N is larger than or equal to 3); all the N coil units are symmetric about an axis center of each of the coil sets and the N coil units are uniformly distributed; an output end of the signal source of the magnetic field driving part is connected to the input end of the power amplifier; an output end of the power amplifier is connected to a corresponding coil unit in the coil sets through a lead; geometric size of a coil skeleton of each of the N coil units is the same; and the coil winding diameter, the material and the winding number are the same.
Description
Technical field
The present invention relates to a kind of generating means of rotating magnetic field.
Background technology
The imaging of magnetic particle is a kind of new formation method, and its principle is the nonlinear magnetization characteristic based on superparamagnetic nanoparticle, is obtained the magnetic particle phase volume fraction of ad-hoc location by the magnetic field trap in space, thus obtains the space fault imaging of magnetic nano particle.
In order to realize the space orientation to magnetic nano particle, initial magnetic field trap uses the mode of 1 magnetic field point, namely adopt a Maxwell coil pair, thus in space by generation 1 magnetic field point, by the gradient fields risen rapidly, the magnetic nano particle in other regions is saturated, thus will only obtain the magnetic nano particle content (BernhardGleich at zero magnetic field intensity point place, Jurgen Weizenecker. " Tomographic imaging using the nonlinear response of magneticparticles ", Nature, Vol 435, 30, 2005).In order to improve sensitivity and the image taking speed of imaging further, there has been proposed the concept of zero magnetic field line.Theoretically, the signal of magnetic particle imaging can be improved nearly 10 times of (JuergenWeizenecker by zero magnetic field line, Bernhard Gleich and Joern Borgert. " Magnetic particle imaging using a field freeline ", J.Phys.D:Appl.Phys.41,2008).Because imaging can be undertaken by the thought of backprojection reconstruction, thus zero magnetic field line can serve as the effect of projection line.But need this projection line to detect fault imaging aspect in rotary manner, mainly contain two kinds of modes at present to realize this rotation, one is mechanical rotation, namely first pass through two to mutually perpendicular Maxwell coil to generation zero magnetic field line, then the mode rotated by machinery makes whole magnet rotate (Tobias Knopp, Marlitt Erbe, Timo F.Sattel, Sven Biederer, and Thorsten M.Buzug. " Generation of a staticmagnetic field-free line using two Maxwell coil pairs ", Appl.Phys.Lett.97, 2010).Another kind is the rotation of power driven, namely magnet itself is motionless, magnetic field rotating is realized by the current phase changing composition coil, higher sweep speed can be reached like this, and avoid because image reconstruction problem (T Knopp, the T F Sattel that brings of machine error, S Biederer and T M Buzug. " Field-free line formation in a magnetic field ", J.Phys.A:Math.Theor.43,2010), be the focus of research at present.The electric power zero magnetic field line generating means magnetic field output but adopted due to T Knopp group is at present low, and Project Realization is difficult, up to the present not yet finds the result of the Project Realization of its image.
Rotating magnetic field can have a lot of mode to generate, as adopted the mode rotating permanent magnet of machinery, as motor or magnetic stirrer etc.; Also the mode of useful hot-wire coil and drive current modulation generates rotating magnetic field, for magnetic navigation, and magnetic orientation etc.CN202307400U proposes a kind of permanent magnet type interval winding rotating magnetic field generation device, is to produce rotating magnetic field by order to excitation winding power on/off.CN200810011110.2 utilizes three to orthogonal square coil, produces sinusoidal signal, through power amplifier drive coil by Single-chip Controlling AD9959.CN101256873B is at three groups of Helmholtz coils, often organizing coil and is formed by three pairs of Helmholtz coils combination coilings, obtaining rotating magnetic field by controlling three groups of three-phase alternating currents.CN102867612A is that the orthogonal helmholtz coil of employing three groups is to carrying out span rotating magnetic field at any angle equally.But all a kind of uniform rotating magnetic field, the namely magnetic field on 0 rank that generation device of rotating magnetic field substantially all at present produces, instead of the gradient magnetic on 1 rank, cannot meet the imaging of magnetic particle to the requirement of rotating magnetic field.
Summary of the invention
The object of the invention is to overcome existing rotating magnetic field device and cannot generate high efficiency gradient magnetic, and mechanical type rotating gradient magnetic speed is slow, the shortcomings such as precision is low, propose a kind of rotation gradient field generator for magnetic based on multi-coil system.Project Realization of the present invention is simple, open good, and can improve its gradients setup efficiency.
Field generator for magnetic of the present invention mainly comprises magnetic field generating portion and field drives part two parts.Magnetic field generating portion is made up of multiple coil, for generating the gradient magnetic of rotation.Field drives part is then that core devices forms by signal source and power amplifier, for give the coil of magnetic field generating portion for electric current.
Described magnetic field generating portion is made up of two coil groups, and these two coil groups are about a plane α specular in space.Each coil groups is made up of N number of coil unit, N be more than or equal to 3 integer, the quantity of the coil unit of two coil groups is equal.In two coil groups, N number of coil unit is symmetrical and be uniformly distributed about coil groups axis centre.Each coil unit is made up of square coil skeleton and coil-winding, and coil-winding is wrapped on coil rack.The physical dimension of the coil rack of all N number of coil units is identical, the wire diameter of coil-winding, and material and number of turns are also identical, N be more than or equal to 3 integer.
In each coil groups, the center of gravity Gi of each coil unit is uniformly distributed on the circle that the center of circle is O, 1≤i≤N, and this circle is parallel to mirror image face.Angle between two adjacent coil units is θ, N × θ is 2 π.Clockwise direction along the circle of center of circle O is seen, the sense of current on each coil is all clockwise or counterclockwise.The size of electric current meets formula and is:
I(i,t)＝Af(2πt/T+2πi/N)
Wherein i is the sequence number of coil, and 1≤i≤N, A is current strength, and T is the swing circle of null field line, and f is periodic function.
Spacing between the coil groups of two groups of mutual mirror images is the distance Gi-Gi ' between its center of gravity, Gi ' is the center of gravity of corresponding coil unit in the mirror image coil groups of i-th coil unit, 1≤i≤N, the center of gravity of the coil unit of each coil groups is d from the distance of center of circle O.Preferably, the spacing Gi-Gi ' between the coil groups of two groups of mutual mirror images can regulate, and distance d also can regulate simultaneously.
Field drives part provides the electric current I as described in above formula.Field drives part comprises signal source and power amplifier, and the output of signal source is connected with the input of power amplifier.The output of power amplifier is connected to corresponding coil unit in coil groups by wire.Look up from the stream of electric current, first signal source generating period function signal f (i, t), be delivered to power amplifier, periodic function signal f (i, t) is modulated into the current signal I (i, t) of each coil by power amplifier, this current signal I (i, t) is delivered on the coil-winding of i-th corresponding coil unit by wire.
Preferably, although the electric current of the required supply of each coil unit is not identical, the symmetric relation between coil unit can be utilized to reduce the quantity of signal source and power amplifier, be convenient to Project Realization.As, the mirror between two coil groups can be utilized, power supply after directly being connected by the wired in series between two of mirror image coil units; And, if often organizing coil number N is even number, 180 degree of phase differences can be utilized, the reversal connection of wire both positive and negative polarity can be realized.
Preferably, field drives part also comprises current protecting circuit, regulates current regulator and the power switch device of electric current power.Current protecting circuit, power switch device, and current regulator is all connected between power amplifier and coil unit, order is in no particular order.
Accompanying drawing explanation
Fig. 1 loop construction block diagram of the present invention;
Fig. 2 coil drive current schematic diagram;
The coil groups structure chart of Fig. 3 embodiment of the present invention;
The coil groups skeleton structure diagram of Fig. 4 embodiment of the present invention;
The coil skeleton structure figure of Fig. 5 embodiment of the present invention;
The phase difference schematic diagram of the supply current of each coil of Fig. 6.
In figure, 1 coil unit, 2,2 ' coil groups, 3 wires, 4 signal sources, 5 power amplifiers, 6 unit coil skeletons, 7 coil-windings, 8 coil groups skeletons.
Embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Rotating magnetic field of the present invention occurs to comprise field drives part and magnetic field creation portion with drive unit.Described field drives part provides the electric current of power demand for magnetic field creation portion, and magnetic field creation portion generates the gradient magnetic rotated.
Described magnetic field generating portion is made up of two coil groups 2,2 ', and two coil groups 2,2 ' are about a plane α specular in space.The loop construction of two coil groups and the size of supply current, to flow to all about plane α specular.Each coil groups is made up of coil groups skeleton 8 and 8 coil units 1, and the skeleton of these 8 coil units has identical physical dimension, and the wire diameter of coil-winding and the number of turn also identical coil unit 1 are made up of coil rack 6 and coil-winding 7 two parts.Coil-winding 7 is wrapped on coil rack 6.
As shown in Figure 1, coil drive part forms primarily of signal source and power amplifier.The wherein 0dB sinusoidal drive signals access power amplifier of signal source generation, the drive singal after power amplification sends into the corresponding coil unit of connected coil groups by power amplifier.
The embodiment of the present invention adopts two groups of coil groups 2,2 ' to generate magnetic field, and often organize coil groups and be made up of 8 coils, 8 coils are divided equally in a circle, and the angle between any two coils is 45 °, as shown in Figure 3.
As shown in Figure 4, the skeleton of the coil groups 2,2 ' of the embodiment of the present invention adopts and the making of coil identical material.Coil groups skeleton 8 is hollow out annular, and the overall diameter of skeleton is
diameter of bore is
uniform 8 slideways that can insert on coil groups skeleton, in order to each coil unit of this slideway fixedly embedded.As shown in Figure 5, each coil rack 6 is of a size of 60mm × 90mm × 10mm; Coil-winding 7 adopts enamelled wire, diameter 1.2mm, coiling totally 28 circles on each coil.As shown in Figure 6, the signal source of field drives part of the present invention adopts DDS chip AD9959 (Analog Devices, Inc, USA), in order to generate the separate sinusoidal signal in four tunnels simultaneously, the amplitude of signal is consistent with frequency, and the phase difference between signal is 45 degree.0 ° in Fig. 6,45 °, 90 ° and 135 ° are respectively signal phase value, and because coil C0 and coil C4 puts specular about unit, the sense of current is contrary, thus the phase difference of coil C4 ~ C7 is respectively: 180 °+0 °, 180 °+45 °, 180 °+90 °, 180 °+135 °.During specific implementation, coil Ci and coil Ci+4, and organize with the electric current in two coils of its mirror image as being connected in series at another.
Claims (4)
1. rotate a generating apparatus for gradient magnetic, it is characterized in that, described field generator for magnetic comprises magnetic field generating portion and field drives part two parts; Described magnetic field generating portion is made up of two coil groups, for generating the gradient magnetic of rotation; Field drives part is made up of signal source and power amplifier, for the electric current supplying to the coil of magnetic field generating portion;
Two coil groups of described magnetic field generating portion are about a plane α specular in space; Each coil groups is made up of N number of coil unit, and all N number of coil units are symmetrical and be uniformly distributed about coil groups axis centre; N be more than or equal to 3 integer;
The output of signal source of described field drives part is connected with the input of power amplifier; The output of power amplifier is connected to corresponding coil unit in coil groups by wire.
2. according to the generating apparatus of rotation gradient magnetic according to claim 1, it is characterized in that, the physical dimension of the coil rack of N number of described coil unit is identical, the wire diameter of coil-winding, material and number of turns identical, N be more than or equal to 3 integer.
3. according to the generating apparatus of rotation gradient magnetic according to claim 1, it is characterized in that, spacing between the described coil groups of two groups of mutual mirror images is the distance Gi-Gi ' between its center of gravity, Gi ' is the center of gravity of the image line coil unit of i-th coil unit, 1≤i≤N, the distance of the centroidal distance center of circle O of each coil groups interior loop unit is O-Gi.
4. according to the generating apparatus of rotation gradient magnetic according to claim 3, it is characterized in that, the spacing Gi-Gi ' between the described coil groups of two groups of mutual mirror images can regulate, and the distance d of the centroidal distance center of circle O of each coil groups interior loop unit can regulate.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109292937A (en) * | 2018-12-09 | 2019-02-01 | 安徽航天环境工程有限公司 | A kind of iron content pickling sludge reuse method |
| CN109292938A (en) * | 2018-12-09 | 2019-02-01 | 安徽航天环境工程有限公司 | One kind washing sludge reuse method containing aluminic acid |
| CN111467682A (en) * | 2020-04-15 | 2020-07-31 | 东莞市银磁磁性材料有限公司 | Spiral magnetic field generating method |
| CN112735732A (en) * | 2020-12-10 | 2021-04-30 | 中国科学院深圳先进技术研究院 | Mixed magnetic field device and mixed magnetic field system |
| CN113066659A (en) * | 2021-03-12 | 2021-07-02 | 中国科学院力学研究所 | Device and method for manufacturing assembled large-magnetic-moment square coil |
| CN114545312A (en) * | 2022-04-22 | 2022-05-27 | 浙江浙大西投脑机智能科技有限公司 | Nonlinear gradient coil and scanning method |
| CN115153488A (en) * | 2022-07-08 | 2022-10-11 | 北京航空航天大学 | Pulsed magnetic nanoparticle imaging system and method based on magnetic field modulation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1525191A (en) * | 2003-02-24 | 2004-09-01 | Gradient coil for a magnetic resonance tomography and its manufacturing method | |
| CN101900796A (en) * | 2009-05-26 | 2010-12-01 | Ge医疗系统环球技术有限公司 | Radio frequency body coil and open type magnetic resonance imaging (MRI) system using same |
| CN103064049A (en) * | 2012-12-21 | 2013-04-24 | 北京航空航天大学 | Three-dimensional standard magnetic field generating device based on phase synchronization |
| CN103472494A (en) * | 2013-09-23 | 2013-12-25 | 中国科学院武汉物理与数学研究所 | Sensor and method for measuring gravitational potential three-order differential quotient based on atom interference effect |
-
2015
- 2015-06-01 CN CN201510299663.2A patent/CN104992807B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1525191A (en) * | 2003-02-24 | 2004-09-01 | Gradient coil for a magnetic resonance tomography and its manufacturing method | |
| CN101900796A (en) * | 2009-05-26 | 2010-12-01 | Ge医疗系统环球技术有限公司 | Radio frequency body coil and open type magnetic resonance imaging (MRI) system using same |
| CN103064049A (en) * | 2012-12-21 | 2013-04-24 | 北京航空航天大学 | Three-dimensional standard magnetic field generating device based on phase synchronization |
| CN103472494A (en) * | 2013-09-23 | 2013-12-25 | 中国科学院武汉物理与数学研究所 | Sensor and method for measuring gravitational potential three-order differential quotient based on atom interference effect |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109292937A (en) * | 2018-12-09 | 2019-02-01 | 安徽航天环境工程有限公司 | A kind of iron content pickling sludge reuse method |
| CN109292938A (en) * | 2018-12-09 | 2019-02-01 | 安徽航天环境工程有限公司 | One kind washing sludge reuse method containing aluminic acid |
| CN111467682A (en) * | 2020-04-15 | 2020-07-31 | 东莞市银磁磁性材料有限公司 | Spiral magnetic field generating method |
| CN112735732A (en) * | 2020-12-10 | 2021-04-30 | 中国科学院深圳先进技术研究院 | Mixed magnetic field device and mixed magnetic field system |
| CN113066659A (en) * | 2021-03-12 | 2021-07-02 | 中国科学院力学研究所 | Device and method for manufacturing assembled large-magnetic-moment square coil |
| CN114545312A (en) * | 2022-04-22 | 2022-05-27 | 浙江浙大西投脑机智能科技有限公司 | Nonlinear gradient coil and scanning method |
| CN115153488A (en) * | 2022-07-08 | 2022-10-11 | 北京航空航天大学 | Pulsed magnetic nanoparticle imaging system and method based on magnetic field modulation |
| CN115153488B (en) * | 2022-07-08 | 2024-06-07 | 北京航空航天大学 | Pulse magnetic nanoparticle imaging system and method based on magnetic field modulation |
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