CN202041589U - Vibration shielded electric field sensor - Google Patents
Vibration shielded electric field sensor Download PDFInfo
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- CN202041589U CN202041589U CN2011201177458U CN201120117745U CN202041589U CN 202041589 U CN202041589 U CN 202041589U CN 2011201177458 U CN2011201177458 U CN 2011201177458U CN 201120117745 U CN201120117745 U CN 201120117745U CN 202041589 U CN202041589 U CN 202041589U
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Abstract
The utility model provides a vibration shielded electric field sensor which comprises an elastic component, a soft hinge, a piezoelectric stack, a base, shielded electrodes and inductive electrodes, wherein the shielded electrodes and the inductive electrodes are respectively arranged in pairs; one end at the X-direction of the soft hinge is fixed on the base, and the inductive electrodes are fixed on the base in an insulating way; and the two ends of the piezoelectric stack are fixedly arranged on the inner walls of the two sides at the X-direction of the soft hinge, the shielded electrodes are arranged at the outer end at the Y-direction of the soft hinge and are tightly pressed on the outer surface at the Y-direction of the soft hinge by the elastic component, and the shielded electrodes are connected with the ground and are arranged above the inductive electrodes that are arranged in pairs. The vibration shielded electric field sensor adopts the principle of electrostriction of piezoelectric materials to generate mechanical motion, and the mechanical motion is amplified by the soft hinge to drive the shielded electrodes connected with the ground to perform periodically reciprocating motion; inductive charges on the inductive electrodes can change periodically, the inductive charges are proportional to the electric field, and the change of the charges forms current; and the relation of the current and the electric field can be obtained after the current is amplified by follow-up circuits.
Description
Technical field
The utility model belongs to electricity field, relates to the measurement of sensor technology and electrostatic field.
Background technology
In commercial production, static has certain harm, the monitoring of static is an important job that is related to product quality, production safety, on meteorology, the atmospheric static electric field is again the key characterization parameter of thunderstorm, lightning monitoring, at earthquake pre-warning, industry electrostatic monitorings such as oil mine also all are important process.At present, an induction type electrostatic tester and a mill formula electrostatic tester are mainly adopted in the monitoring of electrostatic field, the induction type electrostatic tester has the restriction of the measuring distance of regulation, and exists electric charge to leak; Mill formula electric field instrument is not subjected to distance limit not have electric charge to leak yet, but drive motor influences its long time continuous working, and is unstable, power consumption is bigger.
Summary of the invention
The utility model provides a kind of vibration protected type electric-field sensor according to present technology status, and this electric-field sensor does not need motor-driven, and power consumption is little, can directly measure electric field.
The purpose of this utility model realizes by following measure:
A kind of vibration protected type electric-field sensor, its characteristic is: it comprises elastomeric element, flexible hinge and piezoelectric stack, base, and the guarded electrode and the induction electrode that are provided with in pairs; Described flexible hinge directions X one end is fixed on the base, is fixed on the base to the induction electrode insulation;
The piezoelectric stack two ends are installed on the both sides inwall of flexible hinge directions X, guarded electrode is arranged at flexible hinge Y direction outer end, and be pressed on the flexible hinge Y direction outside surface guarded electrode ground connection and place the induction electrode top of paired setting by elastomeric element.
In pairs the guarded electrode that is provided with and induction electrode is provided with a pair of or two pairs is arranged at the both sides of flexible hinge Y direction respectively in the time of two pairs.
Induction electrode all adopts the identical E shape structure of shape with guarded electrode.
The two dislocation of paired induction electrode and guarded electrode or over against setting.To realize different shielding surfaces.
Elastomeric element is adopted as stage clip or U-shaped spring structure, and elastomeric element one end is fixed, and the other end connects guarded electrode.The fixedly connected gland nut of elastomeric element one end, the fixedly connected guarded electrode of the other end.
Flexible hinge profile ovalize, the corresponding major axis of directions X, the corresponding major axis of Y direction.Flexible hinge can adopt single-shaft configuration.
Guarded electrode, gland nut and induction electrode all are metal material; Flexible hinge is made by spring steel, 45 steel or beryllium-bronze; Piezoelectric stack is formed by the material stacks that multilayer has piezoelectric effect.
The utility model has following advantage compared to existing technology:
1, the utility model can directly be measured electric field, does not need during measurement to determine and the electrified body distance.
2, do not need drive motor in the mill formula electric field instrument, so power consumption is little, volume is little, does not have mechanical the wearing and tearing substantially.
The utility model adopts the electrostrictive principle of piezoelectric, produce mechanical motion, mechanical motion is amplified by flexible hinge, the guarded electrode that promotes ground connection is done periodically to-and-fro movement, the periodic variation appears in induced charge on the induced electricity electrode, and its induced charge is directly proportional with electric field, and change in charge forms electric current, through the subsequent conditioning circuit processing and amplifying, determine the relation of itself and electric field.
Description of drawings
Fig. 1 shakes protected type electrostatic transducer structural principle floor map;
Fig. 2 flexible hinge enlarger principle of work synoptic diagram.
Among the figure: the 1-gland nut; The 2-guarded electrode; The 3-flexible hinge; The 4-piezoelectric stack; The 5-induction electrode; 6-U shape spring.
Embodiment
Be example with Fig. 1 below, piezoelectric type electrostatic transducer structural principle is described.In Fig. 1, sensor is horizontal positioned in XOY plane.Sensor is made of guarded electrode 2, gland nut 1, flexible hinge 3, piezoelectric stack 4, base, induction electrode 5, U type spring 6 parts.Guarded electrode 2, gland nut 1, induction electrode 5 all are made of metal, and U type spring 6, flexible hinge be by spring steel, 45 steel, or the beryllium-bronze elastomeric material makes, and piezoelectric stack 4 is formed by the material stacks that multilayer has piezoelectric effect.Flexible hinge 3 adopts single-shaft configuration, and form of cut or cuts adopts ellipsoidal structure, and its output displacement is bigger, and maximum stress is moderate.
In Fig. 1, guarded electrode 2 and induction electrode 5 are provided with two pairs, all adopt E shape electrode, two pairs of both sides that place flexible hinge 3 along the Y direction respectively.(be provided with a pair of also can, but be provided with two pairs better, can reduce error).Piezoelectric stack 4 places in the middle of the flexible hinge, and is fixing with flexible hinge two ends, the 3 inboard left and right sides (directions X), and under the effect of gland nut 1, with guarded electrode 2 and flexible hinge 3 upper and lowers to compressing.Guarded electrode 2 ground connection, guarded electrode 2 belows are induction electrodes 5, are fixed on the base to induction electrode 5 insulation.Guarded electrode 2 can move back and forth above induction electrode 2, to block induction electrode 5.
When in electrostatic field, working, flexible hinge 3x direction one end is fixed on the base, AC signal voltage is added on the piezoelectric stack, piezoelectric stack produces the microvibration of x direction, this microvibration is after flexible hinge amplifies, promote guarded electrode in the to-and-fro movement of y direction, because guarded electrode 2 ground connection are just caused the periodicity shielding to induction electrode 5, make and produce periodic induced charge on the induction electrode 5, this induced charge is directly proportional with electric field, and can form electric current, and induction electrode inserts electronic circuit with shielded cable, the place in circuit weak current is through the I-V conversion, filtering is amplified, and obtains the voltage signal that is directly proportional with electric field behind the phase sensitive detection.
Principle of work of the present utility model is as follows:
Ground connection moving plate with a fixing metal sensing chip (stator) and fixed frequency vibrations, alternately make sensing chip conductively-closed and exposure in electric field, by the electrostatic induction principle, the induced charge that on sensing chip, will change, according to Gauss theorem, the size that can obtain the induced charge Q (t) on the sensing chip is directly proportional with extraneous electric field strength E to be measured.That is:
Wherein ε is the free space specific inductive capacity, the general approximate permittivity of vacuum ε that is taken as
0=8.85 * 10
-12F/m.S(t) be the surface area of sensing chip, when the direction of E is pointed to vibrating reed for just.
Make vibrating reed at the uniform velocity make back and forth movement, in the time of one-period T, area and time t that sensing chip exposes have following relation:
S in the formula
mThe total area for sensing chip
The differential of induced charge
Be induction current:
Then this induction current is equivalent to the square wave that the cycle is T, because ε
0, S
mAnd T is constant, so the electric current that obtains is the measurement parameter that is directly proportional with electrostatic field.
Fig. 2 is oval flexible hinge synoptic diagram, and it is as follows to the small amplification process that piezoelectric stack produces:
Piezoelectric stack changes x under the driving voltage effect, flexible hinge is at the y direction y that changes, because the length of side L of flexible hinge is constant, and L
2=y
2+ x
2, the both sides differentiation,
0=2ydy+2xdx
dy=-xdx/y=-dx/(y/x)
When α is very little, tan α=y/x=α
Obtain the y direction with x direction Changing Pattern: dy=-dx/ α
General α is very little, and for example 5 o'clock, the micro-displacement that piezoelectric stack produces was exaggerated 11.5 times.
Claims (9)
1. one kind is vibrated the protected type electric-field sensor, and it is characterized in that: it comprises elastomeric element, flexible hinge (3) and piezoelectric stack (4), base, and guarded electrode (2) that is provided with in pairs and induction electrode (5); Described flexible hinge directions X one end is fixed on the base, is fixed on the base to the induction electrode insulation;
Described piezoelectric stack (4) two ends are installed on the both sides inwall of flexible hinge (3) directions X, guarded electrode (2) is arranged at flexible hinge (3) Y direction outer end, and be pressed on flexible hinge (3) the Y direction outside surface guarded electrode (2) ground connection and place induction electrode (5) top of paired setting by elastomeric element.
2. vibration protected type electric-field sensor according to claim 1 is characterized in that: guarded electrode of described paired setting (2) and induction electrode (5) are provided with a pair of or two pairs, are arranged at the both sides of flexible hinge Y direction in the time of two pairs respectively.
3. vibration protected type electric-field sensor according to claim 2 is characterized in that: described induction electrode (5) adopts the identical E shape structure of shape with guarded electrode (2).
4. vibration protected type electric-field sensor according to claim 3 is characterized in that: described paired induction electrode (5) is with the two dislocation of guarded electrode (2) or over against setting.
5. vibration protected type electric-field sensor according to claim 1 is characterized in that: described elastomeric element is adopted as stage clip or U-shaped spring structure, and elastomeric element one end is fixed, and the other end connects guarded electrode (2).
6. vibration protected type electric-field sensor according to claim 5 is characterized in that: the described fixedly connected gland nut of elastomeric element one end (1), the fixedly connected guarded electrode of the other end (2).
7. vibration protected type electric-field sensor according to claim 1 is characterized in that: described flexible hinge (3) profile ovalize, the corresponding major axis of directions X, the corresponding major axis of Y direction.
8. vibration protected type electric-field sensor according to claim 7 is characterized in that: described guarded electrode (2), gland nut (1) and induction electrode (5) all are metal material; Flexible hinge (3) is made by spring steel, 45 steel or beryllium-bronze; Piezoelectric stack (4) is formed by the material stacks that multilayer has piezoelectric effect.
9. vibration protected type electric-field sensor according to claim 1 is characterized in that: described flexible hinge adopts single-shaft configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201177458U CN202041589U (en) | 2011-04-20 | 2011-04-20 | Vibration shielded electric field sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201177458U CN202041589U (en) | 2011-04-20 | 2011-04-20 | Vibration shielded electric field sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202041589U true CN202041589U (en) | 2011-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201177458U Expired - Lifetime CN202041589U (en) | 2011-04-20 | 2011-04-20 | Vibration shielded electric field sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169143A (en) * | 2011-04-20 | 2011-08-31 | 南京信息工程大学 | Vibration shielding type electric field sensor |
| CN105676008A (en) * | 2016-01-15 | 2016-06-15 | 中国电力科学研究院 | Digital electric field sensor |
| CN108397333A (en) * | 2018-01-05 | 2018-08-14 | 浙江大学 | A kind of deformable blade mechanism of energy by ocean current generating set |
| CN108508284A (en) * | 2018-03-26 | 2018-09-07 | 中国科学院电子学研究所 | A kind of mutual shielded electric field sensor based on twisting vibration |
-
2011
- 2011-04-20 CN CN2011201177458U patent/CN202041589U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169143A (en) * | 2011-04-20 | 2011-08-31 | 南京信息工程大学 | Vibration shielding type electric field sensor |
| CN105676008A (en) * | 2016-01-15 | 2016-06-15 | 中国电力科学研究院 | Digital electric field sensor |
| CN105676008B (en) * | 2016-01-15 | 2020-04-14 | 中国电力科学研究院 | Digital electric field sensor |
| CN108397333A (en) * | 2018-01-05 | 2018-08-14 | 浙江大学 | A kind of deformable blade mechanism of energy by ocean current generating set |
| CN108508284A (en) * | 2018-03-26 | 2018-09-07 | 中国科学院电子学研究所 | A kind of mutual shielded electric field sensor based on twisting vibration |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20111116 Effective date of abandoning: 20130417 |
|
| RGAV | Abandon patent right to avoid regrant |