CN103293375B - A kind of meta-material resonant frequency test device and method of testing - Google Patents
A kind of meta-material resonant frequency test device and method of testing Download PDFInfo
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- CN103293375B CN103293375B CN201210052045.4A CN201210052045A CN103293375B CN 103293375 B CN103293375 B CN 103293375B CN 201210052045 A CN201210052045 A CN 201210052045A CN 103293375 B CN103293375 B CN 103293375B
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Abstract
The invention provides a kind of magnetic meta-material resonant frequency test device and method of testing, the resonant frequency of Meta Materials can be recorded exactly, realize the detection to Meta Materials product parameters character, moreover it is possible to the application for Meta Materials provides means of testing, and then improves the R & D design efficiency of Meta Materials.
Description
[technical field]
The present invention relates to Meta Materials field, more particularly to the measuring technology of meta-material resonant frequency.
[background technology]
Meta Materials refers to that some have the artificial composite junction of the extraordinary physical property not available for natural material
Structure or composite.By the structurally ordered design on the key physical yardstick of material, can be broken through certain
The restriction of a little apparent natural laws, thus obtain the meta-materials merit of the common character intrinsic beyond nature
Energy.The character of Meta Materials and function mostly come from its internal structure rather than constitute their material, because of
This, for design and synthesis Meta Materials, people have carried out a lot of research work.2000, University of California
Smith et al. point out that the composite construction of the metal wire of periodic arrangement and open loop resonator (SRR) can
To realize DIELECTRIC CONSTANT ε and magnetic permeability μ simultaneously for negative double negative material, also referred to as LHM.Afterwards he
Further through making metal wire and SRR composite construction achieves two dimension printed circuit board (PCB) (PCB) is upper
Double negative materials.Magnetic field is had to metal wire and the open loop resonator structure, normally referred to as magnetic of response
Micro structure.
For having the Meta Materials of negative magnetoconductivity, owing to it has polarization, incidence wave can be produced
Polarization impact, therefore has a wide range of applications, such as the nuclear magnetic resonance in medical imaging field, permissible
Enhancing evanescent wave is to reach to strengthen the purpose of imaging effect, such as in resonant wireless energy transfer,
In resonant fields, add Meta Materials can strengthen wireless energy transmission efficiency, but application needs satisfied condition
It is: the resonant frequency of Meta Materials needs the most just to play beneficial effect.But, for
For Meta Materials through making, on the one hand the resonant frequency of itself is fixing, on the other hand technique
The reason manufactured makes the resonant frequency of Meta Materials present bigger diversity, as known exactly
The resonant frequency of Meta Materials will bring difficulty to application, and the reinforced effects of Meta Materials will weaken significantly, very
To inoperative.Therefore, the test to meta-material resonant frequency becomes technical problem urgently to be resolved hurrily.
In prior art, the emulation meter to meta-material resonant frequency can be realized by the method for Computer Simulation
Calculate, but, there is problems of, for there is the Meta Materials of complex micro structure array, even if adopting
It is also required to long time with high-performance computer and carries out simulation calculation, simultaneously as the difference of manufacturing process
Other property, there is error with actual meta-material resonant frequency in simulation result.
[summary of the invention]
The technical problem to be solved is to provide a kind of meta-material resonant frequency test device and survey
Method for testing.
The present invention realizes goal of the invention and employed technical scheme comprise that, a kind of meta-material resonant frequency test device,
Including:
Alternating message source, produces the ac signal of frequency-adjustable；
Signal transmitting coil, connects the outfan of described alternating message source, in order to produce alternating magnetic field；
First resonance device, described first resonance device includes the first resonance coil and the first tunable capacitor,
Described first resonance coil is in parallel with described first tunable capacitor；
Second resonance device, described second resonance device includes the second resonance coil and the second tunable capacitor,
Described second resonance coil is in parallel with described second tunable capacitor, described first resonance coil and described second
The natural frequency of resonance coil is equal, and described first resonance device and described second resonance device are in described friendship
The coupling carrying out signal in varying magnetic field by the way of resonance is transmitted；
Signal receiving coil, couples with described second resonance device and receives signal；
Signal supervisory instrument, connects described signal receiving coil in order to detect in described signal receiving coil
Signal.
Preferably, described meta-material resonant frequency test device also includes a control system, described control system
System connects and controls described alternating message source, the first tunable capacitor, the second tunable capacitor and signal detection
Device.
Preferably, described signal supervisory instrument is oscillograph or energy meter.
Preferably, described signal receiving coil is parallel with a load.
Above-mentioned meta-material resonant frequency is used to test device, meta-material resonant frequency method of testing bag of the present invention
Include following steps:
A1. the capacitance regulating described first tunable capacitor and described second tunable capacitor is equal；
B1. regulating the frequency of described alternating message source, the signal making described signal supervisory instrument detect is strong
Degree fixes the frequency of described alternating message source after reaching maximum Vm；
C1. Meta Materials to be measured is placed between described first resonance device and described second resonance device, note
Record the signal intensity V that the most described signal supervisory instrument detects；
If d1. signal intensity V is not changed in relative to Vm, then change described first tunable capacitor and institute
State the capacitance of the second tunable capacitor, repeat step a1 to c1, until signal intensity V is relative to Vm
Produce change；
E1. fix described first tunable capacitor and the capacitance of described second tunable capacitor, change friendship continuously
The frequency of stream signal source, adds the signal intensity V of Meta Materials and does not adds Meta Materials under record different frequency
Difference DELTA V of signal intensity V ', obtain the ratio of described difference DELTA V and V ' relative to AC signal
The variation relation of source frequency, the frequency corresponding to the maximum of the ratio being eventually found Δ V with V ' is
The resonant frequency of Meta Materials to be measured.
Above-mentioned meta-material resonant frequency is used to test device, the another kind of survey of meta-material resonant frequency of the present invention
Method for testing comprises the following steps:
A2. the emulation resonant frequency of Meta Materials to be measured is obtained by the method for Computer Simulation；
B2. the frequency regulating described alternating message source is equal to described emulation resonant frequency, described in adjusted in concert
First tunable capacitor and the capacitance of the second tunable capacitor also keep described first tunable capacitor and second can
The capacitance adjusting electric capacity is the most equal, and the signal intensity making described signal supervisory instrument detect reaches maximum
Described first tunable capacitor and the capacitance of the second tunable capacitor is fixed after value Vm；
C2. Meta Materials to be measured is placed between described first resonance device and described second resonance device, note
Record the signal intensity V that described signal supervisory instrument detects；
Changing the frequency of alternating message source the most continuously, the signal adding Meta Materials under record different frequency is strong
Degree V and do not add difference DELTA V of signal intensity V ' of Meta Materials, obtains described difference DELTA V and V '
Ratio, relative to the variation relation of AC signal source frequency, is eventually found the maximum of the ratio of Δ V and V '
Frequency corresponding to value is the resonant frequency of Meta Materials.
Preferably, described b2 step is realized by the following method:
The capacitance C that b21 regulates described first tunable capacitor and the second tunable capacitor is equal, continuously adjusts
The frequency of described alternating message source, the signal intensity making described signal supervisory instrument detect reaches maximum
Vm, frequency f of the alternating message source that record maximum Vm is corresponding；
B22 changes described first tunable capacitor and the capacitance C of the second tunable capacitor and keeps described first
The capacitance C of tunable capacitor and the second tunable capacitor is the most equal, it is thus achieved that frequency f is relative to capacitance C
Variation relation；
B23 is according to the described frequency f variation relation relative to capacitance C, with described emulation resonant frequency
For frequency f, the capacitance regulating described first tunable capacitor and the second tunable capacitor is corresponding capacitance
C, regulates the frequency of described alternating message source equal to described emulation resonant frequency.
When being embodied as, described signal supervisory instrument is using the voltage peak that detects as signal intensity.
When being embodied as, described signal supervisory instrument is using the power that detects as signal intensity.
Preferably, described method of testing also include by control system regulate described alternating message source frequency,
Regulate described first tunable capacitor and the electric capacity of the second tunable capacitor and read described signal supervisory instrument
Detection signal, and carry out the record of data by control system and calculating processes.
By using the meta-material resonant frequency according to the present invention to test device and method of testing, can be accurate
Record the resonant frequency of Meta Materials, it is achieved the detection to Meta Materials product parameters character, moreover it is possible to for super material
The application of material provides means of testing, and then improves the R & D design efficiency of Meta Materials.
[accompanying drawing explanation]
Fig. 1, the structural representation of meta-material resonant frequency of the present invention test device specific embodiment.
Fig. 2, the flow chart of one of method of testing.
Fig. 3, the flow chart of the two of method of testing.
Fig. 4, the flow chart of step b2.
[detailed description of the invention]
The present invention is described in detail with embodiment below in conjunction with the accompanying drawings.
The structural representation of one specific embodiment of meta-material resonant frequency of the present invention test device is referring to attached
Fig. 1, including consisting of part:
Alternating message source 1, produces the ac signal of frequency-adjustable, occurs as can be selected for Agilent signal
Device；
Signal transmitting coil 2, connects the outfan of alternating message source 1, in order to produce alternating magnetic field；
First resonance device, including the first resonance coil 31 and the first tunable capacitor 32, the first resonance line
Circle 31 is in parallel with the first tunable capacitor 32；
Second resonance device, including the second resonance coil 41 and the second tunable capacitor 42, the second resonance line
Circle 41 is in parallel with the second tunable capacitor 42, and the first resonance coil 31 is intrinsic with the second resonance coil 41
Frequency is equal, the alternating magnetic field that the first resonance device and the second resonance device produce at signal transmitting coil 2
In by resonance by the way of carry out signal coupling transmit；
Signal receiving coil 5, couples with the second resonance device and receives signal, and signal receiving coil 5 is also
It is associated with a load resistance 6；
Signal supervisory instrument 7, connects signal receiving coil 5 in order to detect the letter in signal receiving coil 5
Number, the present embodiment uses oscillograph, naturally it is also possible to use energy meter；
Control system 8, connects alternating message source the 1, first tunable capacitor the 32, second tunable capacitor respectively
42 and signal supervisory instrument 6, in order to regulate the occurrence frequency of alternating message source 1, regulation first is adjustable
Electric capacity 32 and the electric capacity of the second tunable capacitor 42 and read the detection signal of signal supervisory instrument 7,
And carry out record and the calculating process of data；
Meta Materials 9 to be measured is placed between the first resonance device and the second resonance device.
Testing device based on above-mentioned meta-material resonant frequency, the present invention provides following two method of testing.
The flow chart of one of method of testing, referring to accompanying drawing 2, comprises the following steps:
A1. the capacitance regulating the first tunable capacitor and the second tunable capacitor is equal；
B1. regulating the frequency of alternating message source, the signal intensity making signal supervisory instrument detect reaches
The frequency of alternating message source is fixed after big value Vm；
C1. Meta Materials to be measured is placed between the first resonance device and the second resonance device, records now institute
State the signal intensity V that signal supervisory instrument detects；
If d1. signal intensity V is not changed in relative to Vm, then changing the first tunable capacitor and second can
Adjust the capacitance of electric capacity, repeat step a1 to c1, until signal intensity V produces change relative to Vm；
E1. fix the first tunable capacitor and the capacitance of the second tunable capacitor, change alternating message source continuously
Frequency, add the signal intensity V of Meta Materials under record different frequency and not add the signal of Meta Materials strong
Degree V ', obtains the ratio variation relation relative to AC signal source frequency of difference DELTA V and V ',
After find the frequency corresponding to maximum of ratio of difference DELTA V and V ' to be the resonant frequency of Meta Materials.
In this method of testing, step a1 is by regulating the first tunable capacitor and the electric capacity of the second tunable capacitor
It is worth equal, the first resonance device and the second resonance device can be made to have identical resonant frequency, step
In b1, when the signal intensity that signal supervisory instrument detects reaches maximum Vm, illustrate that first resonates
Device and the second resonance device define resonance, and frequency now is i.e. regarded as the first resonance device and
The resonant frequency of two resonance devices, step c1 is put between the first resonance device and the second resonance device
After Meta Materials to be measured, if the resonant frequency of Meta Materials to be measured is just equal to this resonant frequency, just can play increasing
The effect of strong resonance field evanescent wave, the signal intensity that signal supervisory instrument detects will produce change, should
When being understood by, resonant frequency herein refers to strengthen the Frequency point that resonant fields evanescent wave effect is the strongest,
It practice, in the range of a band frequency near meta-material resonant frequency, resonant fields evanescent wave can be strengthened
And the signal intensity making signal supervisory instrument detect will produce change, if meta-material resonant frequency to be measured
A neighbouring band frequency scope is all attached less than with the resonant frequency of the first resonance device and the second resonance device
A near band frequency scope overlaps, then the signal intensity that signal supervisory instrument detects will not produce change,
At this time, it may be necessary to carry out step d1, change the first tunable capacitor and the capacitance of the second tunable capacitor, with
Change the first resonance device and the resonant frequency of the second resonance device, repeat step a1 to c1, until
Signal intensity V produces change, one section of frequency near the resonant frequency of Meta Materials the most to be measured relative to Vm
A band frequency scope near rate scope and the resonant frequency of the first resonance device and the second resonance device is sent out
Give birth to coincidence, but the now frequency of alternating message source be not equal to the exact resonant frequency of Meta Materials to be measured,
Then carry out e1 step, fix the first tunable capacitor and the capacitance of the second tunable capacitor, to be measured super
In the case of material is certain with the test resonant frequency of device own, the frequency of alternating magnetic field is closer to be measured super
The resonant frequency of material, Meta Materials to be measured is the biggest to the potentiation of resonant fields evanescent wave, and signal detection fills
Put the signal intensity detected the biggest, obtain the ratio of Δ V and V ' relative to alternating message source frequency
The variation relation of rate, just can find difference DELTA V i.e. to treat with the frequency corresponding to the maximum of the ratio of V '
Survey the resonant frequency of Meta Materials.
The flow chart of the two of method of testing, referring to accompanying drawing 3, comprises the following steps:
A2. the emulation resonant frequency of Meta Materials to be measured is obtained by the method for Computer Simulation；
B2. the frequency of alternating message source is regulated equal to emulation resonant frequency, adjusted in concert the first tunable capacitor
With the capacitance of the second tunable capacitor keep the capacitance of the first tunable capacitor and the second tunable capacitor to begin
Last phase etc., it is adjustable that the signal intensity making signal supervisory instrument detect fixes first after reaching maximum Vm
Electric capacity and the capacitance of the second tunable capacitor；
C2. being placed between the first resonance device and the second resonance device by Meta Materials to be measured, tracer signal is examined
Survey the signal intensity V that device detects；
Changing the frequency of alternating message source the most continuously, the signal adding Meta Materials under record different frequency is strong
Degree V and do not add difference DELTA V of signal intensity V ' of Meta Materials, obtains the ratio of difference DELTA V and V '
Relative to the variation relation of AC signal source frequency, it is eventually found the maximum institute of the ratio of Δ V and V '
Corresponding frequency is the resonant frequency of Meta Materials.
In this method of testing, step a2 can carry out emulation testing by Comsol 3.5 software, obtains
The emulation resonant frequency of Meta Materials to be measured, by step b2 regulation test device in the first resonance device with
The resonant frequency of the second resonance device is equal to this emulation resonant frequency, then is put by Meta Materials to be measured by c2
Test in test device, in step d2, recorded by the method as one of method of testing
The resonant frequency of Meta Materials to be measured.
This method of testing, owing to first carrying out emulating the calculating of resonant frequency, can record Meta Materials to be measured big in advance
The resonance range caused, relative to one of method of testing more simple and fast.
The most repeatedly testing for reducing, as the optimization means of test, step b2 can be by the following method
Realizing, the flow chart of step b2 is referring to accompanying drawing 4:
The capacitance C that b21 regulates the first tunable capacitor and the second tunable capacitor is equal, continuously adjusts exchange
The frequency of signal source, the signal intensity making signal supervisory instrument detect reaches maximum Vm, records
Frequency f of big alternating message source corresponding for value Vm；
B22 changes described first tunable capacitor and the capacitance C of the second tunable capacitor and keeps first adjustable
The capacitance C of electric capacity and the second tunable capacitor is the most equal, it is thus achieved that the change relative to capacitance C of frequency f
Change relation；
B23 is according to the frequency f variation relation relative to capacitance C, to emulate resonant frequency for frequency f,
The capacitance regulating described first tunable capacitor and the second tunable capacitor is corresponding capacitance C, and regulation is handed over
The frequency of stream signal source is equal to emulation resonant frequency.
In above optimization means, after obtaining the frequency f variation relation relative to capacitance C, it is only necessary to
Directly the capacitance C of regulation the first tunable capacitor and the second tunable capacitor is so that the first resonance device and the
The resonant frequency of two resonance devices, equal to the emulation resonant frequency of Meta Materials to be measured, is Comparatively speaking tested more
Fast.
In the above-described embodiments, only the present invention is carried out exemplary description, but those skilled in the art
Can be without departing from the spirit and scope of the present invention to the present invention after reading present patent application
Carry out various amendment.
Claims (9)
1. a meta-material resonant frequency test device, it is characterised in that described resonant frequency test dress
Put and include:
Alternating message source, produces the ac signal of frequency-adjustable；
Signal transmitting coil, connects the outfan of described alternating message source, in order to produce alternating magnetic field；
First resonance device, described first resonance device includes the first resonance coil and the first tunable capacitor,
Described first resonance coil is in parallel with described first tunable capacitor；
Second resonance device, described second resonance device includes the second resonance coil and the second tunable capacitor,
Described second resonance coil is in parallel with described second tunable capacitor, described first resonance coil and described second
The natural frequency of resonance coil is equal, and described first resonance device and described second resonance device are in described friendship
The coupling carrying out signal in varying magnetic field by the way of resonance is transmitted；
Signal receiving coil, couples with described second resonance device and receives signal；
Signal supervisory instrument, connects described signal receiving coil in order to detect in described signal receiving coil
Signal；
Control system, described control system connect and control described alternating message source, the first tunable capacitor,
Second tunable capacitor and signal supervisory instrument.
Meta-material resonant frequency the most according to claim 1 test device, it is characterised in that: institute
Stating signal supervisory instrument is oscillograph or energy meter.
Meta-material resonant frequency the most according to claim 1 test device, it is characterised in that: institute
State signal receiving coil and be parallel with a load.
4. a meta-material resonant frequency method of testing, uses described in any one of claims 1 to 3
Meta-material resonant frequency test device, comprises the following steps:
A1. the capacitance regulating described first tunable capacitor and described second tunable capacitor is equal；
B1. regulating the frequency of described alternating message source, the signal making described signal supervisory instrument detect is strong
Degree fixes the frequency of described alternating message source after reaching maximum Vm；
C1. Meta Materials to be measured is placed between described first resonance device and described second resonance device, note
Record the signal intensity V that the most described signal supervisory instrument detects；
If d1. signal intensity V is not changed in relative to Vm, then change described first tunable capacitor and institute
State the capacitance of the second tunable capacitor, repeat step a1 to c1, until signal intensity V is relative to Vm
Produce change；
E1. fix described first tunable capacitor and the capacitance of described second tunable capacitor, change friendship continuously
The frequency of stream signal source, adds the signal intensity V of Meta Materials and does not adds Meta Materials under record different frequency
The difference △ V of signal intensity V ', obtain the ratio of described difference △ V and V ' relative to AC signal
The variation relation of source frequency, the frequency corresponding to the maximum of the ratio being eventually found △ V with V ' is
The resonant frequency of Meta Materials to be measured.
5. a meta-material resonant frequency method of testing, uses the super material of any one of claims 1 to 3
Material resonant frequency test device, comprises the following steps:
A2. the emulation resonant frequency of Meta Materials to be measured is obtained by the method for Computer Simulation；
B2. the frequency regulating described alternating message source is equal to described emulation resonant frequency, described in adjusted in concert
First tunable capacitor and the capacitance of the second tunable capacitor also keep described first tunable capacitor and second can
The capacitance adjusting electric capacity is the most equal, and the signal intensity making described signal supervisory instrument detect reaches maximum
Described first tunable capacitor and the capacitance of the second tunable capacitor is fixed after value Vm；
C2. Meta Materials to be measured is placed between described first resonance device and described second resonance device, note
Record the signal intensity V that described signal supervisory instrument detects；
Changing the frequency of alternating message source the most continuously, the signal adding Meta Materials under record different frequency is strong
Degree V and do not add the difference △ V of signal intensity V ' of Meta Materials, obtains described difference △ V's and V '
Ratio, relative to the variation relation of AC signal source frequency, is eventually found the maximum of the ratio of △ V and V '
Frequency corresponding to value is the resonant frequency of Meta Materials.
Meta-material resonant frequency method of testing the most according to claim 5, it is characterised in that institute
State b2 step to be realized by the following method:
The capacitance C that b21 regulates described first tunable capacitor and the second tunable capacitor is equal, continuously adjusts
The frequency of described alternating message source, the signal intensity making described signal supervisory instrument detect reaches maximum
Vm, frequency f of the alternating message source that record maximum Vm is corresponding；
B22 changes described first tunable capacitor and the capacitance C of the second tunable capacitor and keeps described first
The capacitance C of tunable capacitor and the second tunable capacitor is the most equal, it is thus achieved that frequency f is relative to capacitance C
Variation relation；
B23 is according to the described frequency f variation relation relative to capacitance C, with described emulation resonant frequency
For frequency f, the capacitance regulating described first tunable capacitor and the second tunable capacitor is corresponding capacitance
C, regulates the frequency of described alternating message source equal to described emulation resonant frequency.
7. according to the meta-material resonant frequency method of testing described in claim 4 or 5, it is characterised in that:
Described signal supervisory instrument is using the voltage peak that detects as signal intensity.
8. according to the meta-material resonant frequency method of testing described in claim 4 or 5, it is characterised in that:
Described signal supervisory instrument is using the power that detects as signal intensity.
9. according to the meta-material resonant frequency method of testing described in claim 4 or 5, it is characterised in that:
Also include by control system regulate described alternating message source frequency, regulate described first tunable capacitor and
The electric capacity of the second tunable capacitor and read the detection signal of described signal supervisory instrument, and by controlling
System carries out record and the calculating process of data.
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| CN1603845A (en) * | 2004-10-28 | 2005-04-06 | 复旦大学 | Detection method for resonance frequency of resonant type piezoelectric microsensor |
| CN101231314A (en) * | 2008-02-21 | 2008-07-30 | 湖南大学 | Method and apparatus for testing magnetosensor resonant frequency elasticity |
| CN102331523A (en) * | 2011-06-02 | 2012-01-25 | 西安电子科技大学 | Detection system and detection method of resonant frequency of small antenna |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1603845A (en) * | 2004-10-28 | 2005-04-06 | 复旦大学 | Detection method for resonance frequency of resonant type piezoelectric microsensor |
| CN101231314A (en) * | 2008-02-21 | 2008-07-30 | 湖南大学 | Method and apparatus for testing magnetosensor resonant frequency elasticity |
| CN102331523A (en) * | 2011-06-02 | 2012-01-25 | 西安电子科技大学 | Detection system and detection method of resonant frequency of small antenna |
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