CN101334453B - Piezoelectric magnetic field modulator - Google Patents
Piezoelectric magnetic field modulator Download PDFInfo
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- CN101334453B CN101334453B CN2007100426837A CN200710042683A CN101334453B CN 101334453 B CN101334453 B CN 101334453B CN 2007100426837 A CN2007100426837 A CN 2007100426837A CN 200710042683 A CN200710042683 A CN 200710042683A CN 101334453 B CN101334453 B CN 101334453B
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- magnetic field
- piezoelectric
- piezoelectric body
- piezoelectrics
- field modulator
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Abstract
The invention discloses a piezoelectric magnetic field modulator, comprising a piezoelectric body and an exciting surface arranged on the surface which is opposite to the length direction of the piezoelectric body; a pair of exciting electrodes are led out of the exciting surface; a detection surface is arranged on the other surface which is opposite to the length direction of the piezoelectric body, and a signal detection line and a single ground wire are led out of the detection surface. The piezoelectric magnetic field modulator utilizes the inverse piezoelectric effect of the piezoelectric body to impose a voltage with a certain amplitude and a certain frequency to the piezoelectric body, thereby allowing the piezoelectric body to generate the piezoelectric deformation or the displacement; a conductive loop is deposited or bonded on the surface of the piezoelectric body, the loop carries out the synchronous cutting motion of magnetic lines of force along with the piezoelectric body or the area of the loop generates the synchronous change, thereby generating the induced electromotive force in the loop; the direct current or the low-frequency magnetic field is modulated to alternating current signals with a certain frequency, the magnetic field can be indirectly measured by measuring the induced electromotive force, and the structure and the process are simple.
Description
Technical field
The present invention relates to a kind of modulator, be specially a kind of piezoelectric magnetic field modulator.
Background technology
In the engineering practical application, measure at direct current or low frequency magnetic field, especially the detection of Weak magentic-field is a cutting edge technology always, general at present Hall effect or the fluxgate technology of adopting.Because there is intrinsic not equipotential voltage equal error in hall effect sensor; And be to eliminate these errors; Not only need change the exciting current direction, also will change magnetic direction, but can not control at a lot of tested magnetic directions of occasion; Therefore in this case, adopting Hall effect to measure Weak magentic-field may not be feasible.Fluxgate technology since structure with the manufacturing process complicacy, cost an arm and a leg, and have nonlinear problem.
Detection for faint direct current signal or low frequency signal; Must consider that imbalance, the temperature of eliminating dc amplification circuit are floated, the influence of thermoelectrical potential, electrochemical potential equal error signal, need tested direct current or low-frequency weak signal be modulated into AC signal or frequency higher signal usually for this reason.
Summary of the invention
The object of the present invention is to provide a kind of piezoelectric magnetic field modulator, utilized the inverse piezoelectric effect of piezoelectrics, be mainly used in the detection of direct current or low frequency magnetic field.
The following technical scheme of the purpose that the present invention realized realizes:
A kind of piezoelectric magnetic field modulator is characterized in that, comprising:
One piezoelectrics,
Be arranged in the perturbed surface on opposite of piezoelectrics length direction; Draw pair of exciting by this perturbed surface;
Be arranged in the detection faces on another opposite of piezoelectrics length direction, draw signal detection line and signal ground by this detection faces.
Said piezoelectrics are superimposed by a plurality of piezoelectric sheets.
It is the bar-shaped of circle that said piezoelectrics can be strip or the cross section that the cross section is a rectangle.
Said signal detection line is a Shielded Twisted Pair, and said signal ground is a shielding line.
Up and down the insulation surface layer on the opposite and the conduction surface layer that is fixed on the insulation surface layer constitute said detection faces with being fixed on the galvanic circle layer by the galvanic circle layer.
Each of said detection faces layer is non-magnet material, and said signal ground is connected with conductor planes.
Said galvanic circle layer is the spirality conductive coil, and the two ends, loop connect signal detection line.
The present invention utilizes the inverse piezoelectric effect of piezoelectrics, applies the voltage of certain amplitude certain frequency to piezoelectrics, makes it produce piezoelectric deforming or displacement; Deposition or bonding galvanic circle on the piezoelectrics body surface; Synchronous cutting magnetic line of force motion is done with piezoelectrics in this loop, or loop area changes synchronously, thereby in the loop, produces induction electromotive force; Direct current or low frequency magnetic field are modulated into the AC signal of certain frequency, promptly are equivalent to measure indirectly magnetic field through measuring this induction electromotive force.
Beneficial effect: can effectively eliminate by the error that imbalance, the temperature of dc amplification circuit are floated, thermoelectrical potential, electrochemical potential etc. produce, and simple in structure.
Description of drawings
Specify the present invention below in conjunction with accompanying drawing and embodiment:
Fig. 1 is the piezoelectric magnetic field modulator synoptic diagram;
Fig. 2 is the detection faces structural representation;
Fig. 3 is a spiral galvanic circle synoptic diagram.
Embodiment
For technological means, character of innovation that the present invention is realized, reach purpose and effect and be easy to understand and understand, below in conjunction with concrete diagram, further set forth the present invention.
Referring to Fig. 1, a kind of piezoelectric magnetic field modulator comprises piezoelectrics 3, and piezoelectrics 3 are superimposed by several piezoelectric sheets, can be that strip or the cross section of rectangle is for circular bar-shaped for the cross section.Be the strip of rectangle for the cross section among the figure.
On opposite of piezoelectrics 3 length directions, be furnished with perturbed surface 4; Draw pair of exciting 2 by this perturbed surface 4; Be arranged in the detection faces 1 on another opposite of piezoelectrics 3 length directions, draw signal detection line 5 and signal ground 6 by this detection faces.Signal detection line 5 is a Shielded Twisted Pair, and signal ground 6 is a shielding line.
Fig. 2 is deposited on the schematic cross-section that detection faces is gone up on piezoelectrics 3 surfaces; For the leakage current of piezoelectrics 3 driving voltages is guided on the signal ground 6; Being close to the one deck on piezoelectrics 3 surfaces and the outermost layer of detection faces 1 is complete continuous conduction surface layer 11; Two insulation surface layers 12 are isolated spirality galvanic circle layer 13 and conduction surface layer 11, and the material of each layer must be a non-magnet material, and conduction surface layer 11 connects signal ground; In order to reduce to conduct electricity the current vortex influence of surface layer 11, conduction surface layer 11 materials must have higher resistivity.
Fig. 3 is a spirality galvanic circle layer synoptic diagram, and signal detection line 5 is inserted at 7 two ends, spirality galvanic circle in the layer respectively.
The principle of piezoelectricity magnetic field modulation is following:
If the driving voltage to piezoelectrics 3 is V=V
mSin ω
aT (V)
The contrary piezoelectric strain coefficient of piezoelectrics 3 is β (m/V)
Two detection faces spirality galvanic circle 5 equivalences are the as broad as long series connection rectangular conductive of N circle loop up and down
The width of supposing every circle rectangular conductive loop is W (m)
The length of supposing every circle rectangular conductive loop is L (m)
Tested magnetic induction density component perpendicular to detection faces is B=B
mSin ω
bT (T)
Being changed to of then every circle rectangular conductive loop area
ds/dt＝WdL/dt＝Wd(βV)/dt＝WβV
mω
acos(ω
at+θ) (m
2/t)
θ considers that piezoelectrics 3 displacements lag behind the phase place of driving voltage.
Therefore, the output signal does
Y＝NWβB
mV
mω
acos(ω
at+θ)sinω
bt (V)
When being D.C. magnetic field by measuring magnetic field, the output signal is:
Y＝NWβBV
mω
acos(ω
at+θ) (V)
This shows that D.C. magnetic field is modulated into AC signal, low frequency magnetic field signal angular frequency is modulated onto ω
a+ ω
bPlace and ω
a-ω
bThe place.Can accurately detect through lock-in amplifier by measuring magnetic field.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the instructions just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection domain to be defined by appending claims and equivalent thereof.
Claims (7)
1. piezoelectric magnetic field modulator is characterized in that: comprising:
One piezoelectrics,
Be arranged in the perturbed surface on piezoelectrics length direction one opposite; Draw pair of exciting by this perturbed surface;
Be arranged in the detection faces on another opposite of piezoelectrics length direction, draw signal detection line and signal ground by this detection faces;
Said detection faces is by the galvanic circle layer, be fixed on the said galvanic circle layer insulation surface layer on the opposite up and down, and the conduction surface layer that is fixed on the said insulation surface layer constitutes.
2. piezoelectric magnetic field modulator according to claim 1 is characterized in that: said piezoelectrics are superimposed by a plurality of piezoelectric sheets.
3. piezoelectric magnetic field modulator according to claim 1 is characterized in that: said piezoelectrics are that the cross section is the strip of rectangle.
4. piezoelectric magnetic field modulator according to claim 1 is characterized in that: said piezoelectrics are that the cross section is the bar-shaped of circle.
5. piezoelectric magnetic field modulator according to claim 1 is characterized in that: said signal detection line is a Shielded Twisted Pair, and said signal ground is a shielding line.
6. piezoelectric magnetic field modulator according to claim 1 is characterized in that: said each layer is non-magnet material, and said signal ground is connected with the conduction surface layer.
7. piezoelectric magnetic field modulator according to claim 1 is characterized in that: said galvanic circle layer is the spirality conductive coil, and the two ends, loop respectively connect an end signal detection line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100426837A CN101334453B (en) | 2007-06-26 | 2007-06-26 | Piezoelectric magnetic field modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100426837A CN101334453B (en) | 2007-06-26 | 2007-06-26 | Piezoelectric magnetic field modulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101334453A CN101334453A (en) | 2008-12-31 |
| CN101334453B true CN101334453B (en) | 2012-04-18 |
Family
ID=40197175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100426837A Expired - Fee Related CN101334453B (en) | 2007-06-26 | 2007-06-26 | Piezoelectric magnetic field modulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101334453B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002069532A2 (en) * | 2000-11-03 | 2002-09-06 | Herzel Laor | Piezoelectric optical cross connect switching |
| CN1489227A (en) * | 2003-07-04 | 2004-04-14 | �Ϻ���ͨ��ѧ | Magne to electric composite material and manufacturing method thereof |
| CN1794480A (en) * | 2005-11-08 | 2006-06-28 | 南京大学 | Bending resonance type magnetoelectric composite material and its manufacturing method |
-
2007
- 2007-06-26 CN CN2007100426837A patent/CN101334453B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002069532A2 (en) * | 2000-11-03 | 2002-09-06 | Herzel Laor | Piezoelectric optical cross connect switching |
| CN1489227A (en) * | 2003-07-04 | 2004-04-14 | �Ϻ���ͨ��ѧ | Magne to electric composite material and manufacturing method thereof |
| CN1794480A (en) * | 2005-11-08 | 2006-06-28 | 南京大学 | Bending resonance type magnetoelectric composite material and its manufacturing method |
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| Publication number | Publication date |
|---|---|
| CN101334453A (en) | 2008-12-31 |
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