CN102683872B - A kind of negative-magnetic-permeability meta-material and MRI magnetic signal enhancement device - Google Patents
A kind of negative-magnetic-permeability meta-material and MRI magnetic signal enhancement device Download PDFInfo
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- CN102683872B CN102683872B CN201210110055.9A CN201210110055A CN102683872B CN 102683872 B CN102683872 B CN 102683872B CN 201210110055 A CN201210110055 A CN 201210110055A CN 102683872 B CN102683872 B CN 102683872B
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Abstract
The invention provides a kind of negative-magnetic-permeability meta-material and MRI magnetic signal enhancement device, negative-magnetic-permeability meta-material comprises the metamaterial layer that at least one deck has negative magnetoconductivity, metamaterial layer comprises multiple first man-made microstructure and the second man-made microstructure that substrate and cyclic array are arranged in substrate both sides, first man-made microstructure is made up of the first artificial microstructure unit of four circular array, second man-made microstructure is made up of the second man-made microstructure unit of four circular array, first artificial microstructure unit and the second man-made microstructure unit are openings at the opening resonance loop structure of a jiao, the position of the second man-made microstructure unit and the first artificial microstructure unit one_to_one corresponding, the shape of the second man-made microstructure unit is that the shape of the first artificial microstructure unit revolves around the geometric center of annular array the shape that turnback obtains.The present invention effectively can reduce the resonance frequency of Meta Materials.In addition, in MRI magnetic signal enhancement device of the present invention, there is larger application.
Description
[technical field]
The present invention relates to Meta Materials field, relate to a kind of negative-magnetic-permeability meta-material and MRI magnetic signal enhancement device particularly.
[background technology]
At present, international community has large quantifier elimination to magnetic permeability aspect, research wherein for positive magnetic permeability has been tending towards ripe, research for negative-magnetic-permeability meta-material is the focus of research both at home and abroad now, negative magnetoconductivity has quantum polarization, polarization can be produced to incident wave, therefore sphere of action is very large, as the mr imaging technique in medical imaging field, negative magnetic-inductive capacity material can strengthen electromagnetic imaging effect, negative magnetic-inductive capacity material also plays an important role in lens research in addition, at engineering field, magnetic permeability all refers to relative permeability usually, for absolute permeability μ and the magnetic constant μ of material
0the ratio of (also known as permeability of vacuum), μ
r=μ/μ
0, dimensionless number.Usually " relatively " two word and symbol subscript r be all removed.Magnetic permeability is when representing that material is subject to magnetizing field H effect, the increase (μ > 1) of inner true magnetic field relative to H or the degree of minimizing (μ < 1).So far, in the already present material of the nature found, μ is greater than 0.
The principle of nulcear magnetic resonance (NMR) (MRI) imaging system utilizes coil to remove the radio wave pulses energy detecting nuclear spin absorption and launch, and this coil, as receiving coil, is being gone back simultaneously as transmitting coil sometimes.Under the help of radio wave pulses energy, Magnetic resonance imaging scanner can a very little point in position patient body, then determines that this is the tissue of which kind of type.Magnetic resonance imaging machine device adopts the radio frequency pulse specific to hydrogen atom.The body region that will check is aimed in System guides pulse, and causes the proton uptake in this region to make them with the energy needed for different directions rotation or precession.This is NMR imaging device " resonance " part.Radio frequency pulse forces their (refer to unnecessary in each 1,000,000 proton a pair or two to unmatched proton) to rotate according to specific direction under characteristic frequency.The characteristic frequency causing resonance is called as Rameau that frequency, and this value draws according to wanting the magnetic field intensity of the particular organization of imaging and main field to calculate.Radio frequency pulse utilizes a coil to provide usually, and this coil is called transmitting coil.The receiving coil of existing magnetic resonance imaging device must quite near-earth close to detected part, to obtain the magnetic signal discharged by detected part.
Meta Materials refers to some artificial composite structures with the extraordinary physical property not available for natural material or composite material.By the structurally ordered design on the key physical yardstick of material, the restriction of some apparent natural law can be broken through, thus obtain the meta-materials function exceeding the same common character had of nature.The character of Meta Materials and function mainly come from the structure of its inside but not form their material.At present, the geometry of existing metal man-made microstructure is the open annular of " work " font or similar " recessed " font as shown in Figure 1, but this structure all can not realize magnetic permeability μ and be significantly less than 0 or make meta-material resonant frequency reduce, isotropism can not be realized, only has the metal man-made microstructure by design with special geometric figure, just can make this artificial electromagnetic material in special frequency channel, reach magnetic permeability μ value and be less than 0, and there is lower resonance frequency.
[summary of the invention]
Technical problem to be solved by this invention is, for the defect that negative-magnetic-permeability meta-material resonance frequency in prior art is higher, there is provided the isotropism negative-magnetic-permeability meta-material that a kind of resonance frequency is lower, in addition, negative-magnetic-permeability meta-material of the present invention has larger application in magnetic signal enhance device.
The technical scheme that the present invention realizes goal of the invention employing is, comprise the metamaterial layer that at least one deck has negative magnetoconductivity, described metamaterial layer comprises multiple first man-made microstructure and the second man-made microstructure that substrate and cyclic array are arranged in substrate both sides, described first man-made microstructure is made up of the first artificial microstructure unit of four circular array, described second man-made microstructure is made up of the second man-made microstructure unit of four circular array, described first artificial microstructure unit and the second man-made microstructure unit are openings at the opening resonance loop structure of a jiao, the position of described second man-made microstructure unit and the first artificial microstructure unit one_to_one corresponding, the shape of described second man-made microstructure unit is that the shape of described first artificial microstructure unit revolves around the geometric center of described annular array the shape that turnback obtains.
Preferably, described first man-made microstructure and the second man-made microstructure are covered with protective layer.
Preferably, described protective layer thickness is 0.08-0.12mm.
Preferably, the dielectric constant of described protective layer is 4-8.
Preferably, the loss tangent value of described protective layer is 0.010-0.015.
Preferably, described protective layer is high-molecular organic material or ceramic material.
Preferably, the thickness of described substrate is 0.008-0.015mm.
Preferably, the dielectric constant of described substrate is 14-20.
Preferably, the loss tangent value of described substrate is 0.003-0.007.
A kind of MRI magnetic signal enhancement device, between the magnetic signal receiving coil being arranged on detected part and MRI imaging device, described MRI magnetic signal enhancement device is Meta Materials, and described Meta Materials has negative magnetoconductivity under the magnetic signal operating frequency of MRI imaging device.
Preferably, described Meta Materials is above-described negative-magnetic-permeability meta-material.
Beneficial effect of the present invention is, Meta Materials of the present invention is formed by stacking by the man-made microstructure of multilayer through particular design, and substrate adopts the material that dielectric constant is higher, loss is lower, greatly can reduce the resonance frequency of Meta Materials, have good development prospect.The present invention can be applied in magnetic amplifier part, magnetic amplifier part utilizes the magnetic permeability of negative-magnetic-permeability meta-material for this characteristic negative, reach the effect that signal strengthens, reduce the frequency of negative-magnetic-permeability meta-material, it is the operating frequency in order to obtain closer to MRI imaging device, make MRI imaging device imaging effect better, reduce the cost of MRI imaging device.
[accompanying drawing explanation]
Fig. 1, existing negative-magnetic-permeability meta-material man-made microstructure schematic diagram;
Fig. 2, the structural representation of preferred embodiment of the present invention Meta Materials;
Fig. 3, the preferred embodiment of the present invention first man-made microstructure schematic diagram;
Fig. 4, the artificial microstructure unit structural representation of the preferred embodiment of the present invention first;
Fig. 5, the preferred embodiment of the present invention second man-made microstructure schematic diagram;
Fig. 6, the preferred embodiment of the present invention second man-made microstructure cellular construction schematic diagram;
Fig. 7, the structural representation of the another preferred embodiment Meta Materials of the present invention;
Fig. 8, preferred embodiment of the present invention magnetic permeability simulated effect schematic diagram;
In figure, 1 first man-made microstructure, 2 second man-made microstructure, 3 substrates, 4 protective layers, 11 first artificial microstructure units, 22 second man-made microstructure unit.
[embodiment]
Below in conjunction with drawings and Examples, the present invention is described in detail.
The invention provides a kind of negative-magnetic-permeability meta-material, as shown in Figure 2, comprise the metamaterial layer that at least one deck has negative magnetoconductivity, metamaterial layer comprises multiple first man-made microstructure 1 and the second man-made microstructure 2 that substrate 3 and cyclic array are arranged in substrate 3 both sides, as shown in Figure 3, the first man-made microstructure 1 is made up of the first artificial microstructure unit 11 of four circular array.As shown in Figure 5, second man-made microstructure 2 is made up of the second man-made microstructure unit 22 of four circular array, as shown in Fig. 4, Fig. 6, first artificial microstructure unit 11 and the second man-made microstructure unit 22 are openings at the opening resonance loop structure of a jiao, the position of the second man-made microstructure unit 22 and the first artificial microstructure unit 11 one_to_one corresponding, the shape of the second man-made microstructure unit 22 is that the shape of the first artificial microstructure unit 11 revolves around the geometric center of described annular array the shape that turnback obtains.
Below in conjunction with accompanying drawing, the principle of compositionality of the negative-magnetic-permeability meta-material of the embodiment of the present invention and beneficial effect are elaborated.
First man-made microstructure 1 and the second man-made microstructure 2 are periodic arrangement in two relative sides of substrate 3, such as rectangular array arrangement, namely with an x direction be row, with perpendicular to x direction y direction be row arrange, and each line space, each column pitch are equal respectively, even line space equals column pitch.Preferred line space, column pitch are not more than 1/5th of the wavelength of the incident electromagnetic wave that will respond, the i.e. electromagnetic wave of such as operational environment to be wavelength be λ, Meta Materials is needed to be present negative magnetoconductivity to this electromagnetic electromagnetic property, when then designing man-made microstructure, above-mentioned line space, column pitch are selected to be not more than λ/5, be preferably λ/10.Obviously, in order to make man-made microstructure not overlapping mutually, length and the width of each man-made microstructure are also not more than λ/5.Periodic arrangement can also have other to have the arrangement mode of circulation law, such as when substrate 3 is circular or polygon time, first man-made microstructure 1 and the second man-made microstructure 2 are along the equidistant array of external cylindrical surface one week of circular or polygon substrate 3, the substrate 3 of the preferred embodiment of the present invention is rectangle, see Fig. 2.
When metamaterial layer has multiple, they can be encapsulated according to certain rule, shown in the structural representation of preferred embodiment Meta Materials as another in Fig. 7 the present invention, this embodiment comprises two-layer metamaterial layer.The present invention is such as when substrate 3 is tabular, each metamaterial layer is arranged in order along the direction perpendicular to substrate 3 surface, arranged in parallel between layers, preferred parallel and spacing is equal, when substrate 3 is above-mentioned circle or polygon, then can by concyclic for multiple metamaterial layer axle install fixing.
Substrate 3 of the present invention should select frivolous, that dielectric constant is high, loss is low substrate, and therefore the thickness of substrate 3 is 0.008-0.015mm, and loss tangent value is 0.003-0.007, and dielectric constant is 14-20.Protective layer 4 major function is protection first man-made microstructure 1 and the second man-made microstructure 2, and protective layer 4 can use high-molecular organic material or ceramic material.The thickness of protective layer 4 is 0.08-0.12mm, and the dielectric constant of protective layer 4 is 4-8, and the loss tangent value of protective layer 4 is 0.010-0.015.Preferred embodiment of the present invention substrate 3 selects that thickness is 0.011mm, dielectric constant is 16, loss tangent value is the ceramic substrate of 0.005, and PP material selected by protective layer 4, and thickness is 0.1mm, and dielectric constant is 4.8, and loss tangent value is 0.013.
The present invention first man-made microstructure 1 and the second man-made microstructure 2, as shown in Fig. 3, Fig. 5, first man-made microstructure 1 and the second man-made microstructure 2 by four independently man-made microstructure unit combination form, any man-made microstructure unit is opening at the opening resonance loop structure of a jiao, and the shape of the second man-made microstructure unit 22 is that the shape of the first artificial microstructure unit 11 revolves around the geometric center of described annular array the shape that turnback obtains.First artificial microstructure unit 11 and the second man-made microstructure unit 22 can select copper cash, silver-colored line, copper alloy, or even gold thread, or nonmetallic electric conducting material, as conductive plastics etc., the first artificial microstructure unit 11 is greater than 2 with the nested number of plies of the second man-made microstructure unit 22.The live width of the first artificial microstructure unit 11 and the second man-made microstructure unit 22 is 0.1-0.3mm, the thickness of the first artificial microstructure unit 11 and the second man-made microstructure unit 22 is 0.03-0.05mm, and the distance between centers of tracks of the first artificial microstructure unit 11 and the second man-made microstructure unit 22 is 0.05-0.15mm.First artificial microstructure unit 11 of the preferred embodiment of the present invention and the second man-made microstructure unit 22 use copper cash, and to be 0.10mm, live width d2 be live width d1
d1, d2 are as shown in Fig. 4, Fig. 6, and the thickness of copper cash is 0.033mm, and the distance between centers of tracks of copper cash is 0.10mm, and the overall dimensions of the first man-made microstructure 11 and the second man-made microstructure 22 is 3mm × 3mm.According to the needs of adjustment frequency, the nested number of plies of man-made microstructure unit or the overall dimensions of convergent-divergent man-made microstructure can be increased.
The principle that the present invention realizes negative magnetoconductivity is, for man-made microstructure, LC oscillating circuit can be equivalent to, copper cash is equivalent to inductance L, the coupling capacitance equivalent capacity C between line capacitance, triangle torus, is found by emulation, in the immovable situation of other conditions, copper cash is longer, and distance between centers of tracks is nearer, then equivalent capacitance value C is larger.
In like manner we can judge the change of inductance L qualitatively, and copper cash line length is longer, and inductance L is larger.In the present invention, the copper cash winding turns of man-made microstructure unit is more, its inductance larger (there is mutual inductance).
By LC oscillating circuit formula
known, when inductance value increases, the resonance frequency of its correspondence then reduces.
Prior art is directly arranged on substrate by " spill " shown in Fig. 1 split ring resonator cyclic array, make Meta Materials, Meta Materials is anisotropic, the man-made microstructure of Meta Materials of the present invention is man-made microstructure superposition group as shown in Figure 3, Figure 4, not only can effectively reduce the resonance frequency of Meta Materials, the isotropism of Meta Materials can also be realized.
Emulate the negative-magnetic-permeability meta-material of the embodiment of the present invention with CST, simulation architecture parameter is, d1=0.1mm,
d1, d2 is as Fig. 4, shown in Fig. 6, copper cash distance between centers of tracks 0.1mm, copper cash thickness 0.033mm, the thickness of substrate 3 is 0.011mm, dielectric constant is 16, loss tangent value is the ceramic substrate of 0.005, protective layer 4 is PP material, thickness is 0.1mm, dielectric constant is 4.8, loss tangent value is 0.013, size 3mm × the 3mm of the first man-made microstructure 1 and the second man-made microstructure 2, simulation result schematic diagram is see Fig. 6, as shown in Figure 6, Meta Materials magnetic permeability of the present invention be-1 respective frequencies be 1.49GHz, frequency reducing Be very effective, loss is less, the isotropism of Meta Materials can be realized, for Meta Materials industrial expansion, significant.
According to negative-magnetic-permeability meta-material of the present invention, a kind of MRI magnetic signal enhancement device can be prepared: in MRI imaging device, between magnetic signal receiving coil MRI magnetic signal enhancement device being arranged on detected part and MRI imaging device, MRI magnetic signal enhancement device is negative-magnetic-permeability meta-material of the present invention, Meta Materials of the present invention has negative magnetoconductivity under the magnetic signal operating frequency of MRI imaging device, the resonance frequency of negative-magnetic-permeability meta-material can strengthen its signal strength signal intensity at magnetic signal working frequency range, and then the image quality of Contrast-enhanced MRI imaging device, reduce the cost of MRI imaging device.There is good development prospect.
Above-described embodiment in the present invention has only done exemplary description, and those skilled in the art can carry out various amendment to the present invention without departing from the spirit and scope of the present invention after reading present patent application.
Claims (13)
1. a negative-magnetic-permeability meta-material, comprise the metamaterial layer that at least one deck has negative magnetoconductivity, described metamaterial layer comprises substrate and cyclic array and is arranged in multiple second man-made microstructure that multiple first man-made microstructure of substrate side and cyclic array are arranged in substrate opposite side, it is characterized in that, described first man-made microstructure is made up of the first artificial microstructure unit of four circular array, described second man-made microstructure is made up of the second man-made microstructure unit of four circular array, described first artificial microstructure unit and the second man-made microstructure unit are openings at the opening resonance loop structure of a jiao, the position of described second man-made microstructure unit and the first artificial microstructure unit one_to_one corresponding, the shape of described second man-made microstructure unit is that the shape of described first artificial microstructure unit revolves around the geometric center of described annular array the shape that turnback obtains.
2. negative-magnetic-permeability meta-material according to claim 1, is characterized in that, described first man-made microstructure and the second man-made microstructure are covered with protective layer.
3. negative-magnetic-permeability meta-material according to claim 2, is characterized in that, the thickness of described protective layer is 0.08-0.12mm.
4. negative-magnetic-permeability meta-material according to claim 2, is characterized in that, the relative dielectric constant of described protective layer is 4-8.
5. negative-magnetic-permeability meta-material according to claim 2, is characterized in that, the loss tangent value of described protective layer is 0.010-0.015.
6. negative-magnetic-permeability meta-material according to claim 2, is characterized in that, described protective layer is high-molecular organic material or ceramic material.
7. negative-magnetic-permeability meta-material according to claim 1, is characterized in that, the thickness of described substrate is 0.008-0.015mm.
8. negative-magnetic-permeability meta-material according to claim 1, is characterized in that, the relative dielectric constant of described substrate is 14-20.
9. negative-magnetic-permeability meta-material according to claim 1, is characterized in that, the loss tangent value of described substrate is 0.003-0.007.
10. negative-magnetic-permeability meta-material according to claim 1, is characterized in that, the live width of described man-made microstructure is 0.1-0.3mm.
11. negative-magnetic-permeability meta-materials according to claim 1, is characterized in that, the distance between centers of tracks of described man-made microstructure is 0.05-0.15mm.
12. negative-magnetic-permeability meta-materials according to claim 1, is characterized in that, the line thickness of described man-made microstructure is 0.03-0.05mm.
13. 1 kinds of MRI magnetic signal enhancement device, between the magnetic signal receiving coil being arranged on detected part and MRI imaging device, it is characterized in that, described MRI magnetic signal enhancement device is Meta Materials, and described Meta Materials has negative magnetoconductivity under the magnetic signal operating frequency of MRI imaging device; Described Meta Materials is the arbitrary described negative-magnetic-permeability meta-material of claim 1 to 12.
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| CN102931494A (en) * | 2012-11-10 | 2013-02-13 | 清华大学 | Optical frequency intrinsic supernormal electromagnetic dielectric material and preparation and application method thereof |
| CN104459585A (en) * | 2014-11-27 | 2015-03-25 | 骆柳春 | Magnetic signal enhancement device used for magnetic resonance imaging |
| CN107994352A (en) * | 2017-12-27 | 2018-05-04 | 北京航天飞腾装备技术有限责任公司 | A kind of wave-absorber unit, electromagnetic wave absorption body and radio frequency sending set |
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| CN101268593A (en) * | 2005-09-19 | 2008-09-17 | 惠普开发有限公司 | Method and apparatus for electromagnetic resonance using negative index material |
| CN101292175A (en) * | 2005-10-18 | 2008-10-22 | 特西奥普技术有限公司 | Method and apparatus for high-gain magnetic resonance imaging |
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| CN101268593A (en) * | 2005-09-19 | 2008-09-17 | 惠普开发有限公司 | Method and apparatus for electromagnetic resonance using negative index material |
| CN101292175A (en) * | 2005-10-18 | 2008-10-22 | 特西奥普技术有限公司 | Method and apparatus for high-gain magnetic resonance imaging |
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| Microfluidics for reconfigurable electromagnetic metamaterials;T. Serkan Kasirga et al.;《APPLIED PHYSICS LETTERS》;20091125;第1页第1段、图1 * |
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