CN207215908U - A kind of isotropism emf sensor - Google Patents
A kind of isotropism emf sensor Download PDFInfo
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- CN207215908U CN207215908U CN201721262307.4U CN201721262307U CN207215908U CN 207215908 U CN207215908 U CN 207215908U CN 201721262307 U CN201721262307 U CN 201721262307U CN 207215908 U CN207215908 U CN 207215908U
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- 239000002184 metal Substances 0.000 claims abstract description 40
- 229910052751 metal Inorganic materials 0.000 claims abstract description 40
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 32
- 238000004804 winding Methods 0.000 claims abstract description 22
- 230000005611 electricity Effects 0.000 claims description 4
- 230000005684 electric field Effects 0.000 abstract description 31
- 230000005291 magnetic effect Effects 0.000 abstract description 27
- 238000005259 measurement Methods 0.000 abstract description 22
- 230000007547 defect Effects 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 abstract 1
- 238000005070 sampling Methods 0.000 description 11
- 230000005292 diamagnetic effect Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000005674 electromagnetic induction Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The utility model discloses a kind of isotropism emf sensor, mainly it is made up of at least one electromagnetic field sensing unit, electromagnetic field sensing unit is the multiturn coil winding wrapped up by metal screen layer, metal screen layer symmetrically opens up the first opening and the second opening, metal screen layer is divided into two sections of independent regions by the first opening and the second opening, first opening and the second opening connect first lead-out terminal and the second lead-out terminal respectively, the 3rd opening and the 4th opening are symmetrically opened up in the perpendicular both sides of metal screen layer and the first opening and the second opening line, every section of region division is two cross-talk regions by the 3rd opening and the 4th opening, interconnection has low-resistance circuit to two sections of independent subregions end to end, form 8-shaped loop.A kind of isotropism emf sensor of the present utility model, solves the defects of emf sensor electric field measurement can decline rapidly to poor anti jamming capability, the accuracy of measurement in magnetic field with the increase of field frequency and amplitude.
Description
Technical field
Electromagnetic field measurementses technical field is the utility model is related to, more specifically, it relates to a kind of isotropism electromagnetic field
Sensor.
Background technology
Current existing electromagnetic field measurementses technology has many different detection methods to the electromagnetic field of 3Hz-3KHz frequency ranges, leads to
It is low frequency often to define 3Hz-3KHz frequency ranges.The principle of electric field (E) sensor is typically based on capacitive element, such as parallel plate capacitance
Device；The principle of magnetic field (B) sensor is typically that coil windings are based on induced-current caused by Faraday's electromagnetic induction law.In order to
Enable coil windings that the influence of external electrical field, generally use metal screen layer parcel coil windings, and metallic shield is immunized
An opening can be set on layer prevents the magnetic field of change from producing induced-current in screen layer.
As shown in figure 1, having electric field and the magnetic field that some probes can measure low frequency simultaneously, sensed used in these probes
Unit is the coil that a circle carries two openings, and aperture position is relative with coil diameter.When measuring electromagnetic field, coil is drawn respectively
Two opening output signals enter respective signal processing circuit；The output signal of signal processing circuit respectively with magnetic field
（B）And electric field（E）Amplitude in proportion.But the sensing unit has the obvious disadvantage that：I.e. the sensor structure can be used
Measurement in electric field and magnetic field, but electric field and magnetic field can not be measured simultaneously, and because being single-turn circular coil, sensor is to low frequency
Field sensitivity is low, it is therefore desirable to which the signal processing circuit of complex designing is to strengthen output signal.For disadvantages mentioned above, these probes
Sensing unit be designed as the coil windings being made up of multiturn coil, and the metal screen layers composition with two openings.
Based on isotropism emf sensor made of above-mentioned electromagnetic field sensing unit scheme, sensed by three electromagnetic fields
Unit forms；And each electromagnetic field sensing unit is the multicircuit winding coil wrapped up by metal screen layer, on metal screen layer
The relative position of diameter has opened up two openings；Metal screen layer is divided into two sections of independent regions by the position of opening,
The terminal in each region is provided with lead-out terminal；One of terminal is used to export the induced electricity in the coil windings in measurement magnetic field
Stream, another terminal is used to export the induced voltage on screen layer, and another of metal screen layer functions as electric field survey
Quantity sensor is used to measure electric field.
Above-mentioned isotropism emf sensor can measure electric field and magnetic field simultaneously, and not need complicated signal
Process circuit；But this sensor still suffers from poor anti jamming capability of the electric field measurement to magnetic field of sensor, accuracy of measurement
The defects of declining rapidly with the increase of field frequency and amplitude.
Therefore need to propose a kind of new scheme to solve this problem.
Utility model content
In view of the deficienciess of the prior art, the purpose of this utility model is to provide a kind of isotropism electromagnetic field sensing
Device, solves emf sensor electric field measurement to the poor anti jamming capability in magnetic field, accuracy of measurement with field frequency and amplitude
Increase the defects of declining rapidly.
Above-mentioned technical purpose of the present utility model technical scheme is that：A kind of isotropism electromagnetism
Field sensor, mainly it is made up of at least one electromagnetic field sensing unit, each electromagnetic field sensing unit includes metallic shield
Layer, the multiturn coil winding wrapped up by metal screen layer, symmetrically offer the first opening and second on the metal screen layer
Metal screen layer is divided into two sections of independent areas by opening so that multiturn coil winding is exposed, by the first opening and the second opening
Domain, it is connected in the described first opening and the second opening for exporting faradic first output on multiturn coil winding
Terminal and the second lead-out terminal for exporting induced voltage on metal screen layer, mutually hung down with the first opening and the second opening line
The both sides of the straight metal screen layer symmetrically offer the 3rd opening and the 4th opening so that the multiturn coil winding is exposed,
Two sections of independent region divisions are respectively two sections of independent subregions by the 3rd opening and the 4th opening；Same independent area
In domain, 8-shaped loop is formed by being provided with the intersecting connection of low-resistance circuit end to end between two sections of independent subregions.
By using above-mentioned technical proposal, in the prior art, two are provided with the case where field frequency and amplitude become big
Induced-current can be still produced in the metal screen layer of opening, in this case, is measuring the second opening of the second lead-out terminal
There can be a displacement current, and a voltage drop is produced on its sampling resistor, but this voltage drop is due to that magnetic field produces
Rather than electric field so that electric field measurement is inaccurate；And above-mentioned technical proposal of the present utility model, by using low-resistance line
By two sections of independent subregions, interconnection forms 8-shaped loop, according to the law of electromagnetic induction, each 8-shaped loop end to end on road
Produce cancelled each other clockwise with electric current counterclockwise, two electric currents respectively, electric current would not be produced, i.e., on sampling resistor
Voltage drop will not be produced because of induced-current caused by magnetic field；So that the diamagnetic field of the electric field measurement of emf sensor is done
It is strong to disturb ability, can simultaneously, it is independent, accurately measure electric field and magnetic field.
The utility model is further arranged to：In same independent region, the 8-shaped loop is closed back including two
Road, two loop area equations, and face normal orientation is opposite.
By using above-mentioned technical proposal, the magnetic flux of the metal screen layer institute envelope surface product in each 8-shaped loop is kept not
Become, i.e., induced-current will not be produced in metal screen layer, so as to avoid the pseudo- pressure drop on electric field measurement sampling resistor, thus obtain
Very strong diamagnetic field interference performance is arrived.
The utility model is further arranged to：The electromagnetic field sensing unit has three, and three electromagnetic field sensings are single
First pairwise orthogonal.
The utility model is further arranged to：The electromagnetic field sensing unit is circle, adjacent two first opening, the
Central angle corresponding to two openings, the 3rd opening and the 4th opening is 90 degree.
The utility model is further arranged to：The electromagnetic field sensing unit is rectangle, and first opening, second open
The position of mouth, the 3rd opening and the 4th opening is at the center of each edge.
The utility model is further arranged to：The number of turn of the coil windings is 12 circles.
In summary, the utility model has the advantages that：By using low-resistance circuit by two sections of independent sub-districts
Interconnection forms 8-shaped loop, according to the law of electromagnetic induction, the metal screen layer institute envelope surface in each 8-shaped loop end to end in domain
Long-pending magnetic flux keeps constant, i.e., induced-current will not be produced in metal screen layer, so as to avoid electric field measurement sampling resistor
On because of induced-current caused by magnetic field produce voltage drop；So that the diamagnetic field interference performance of the electric field measurement of emf sensor
By force, can simultaneously, it is independent, accurately measure electric field and magnetic field.
Brief description of the drawings
Fig. 1 is the structural representation of prior art；
Fig. 2 is the structural representation of the electromagnetic field sensing unit of the present embodiment one；
Fig. 3 is the structural representation of the emf sensor of the present embodiment one；
Fig. 4 is the structural representation of the electromagnetic field sensing unit of the present embodiment two.
In figure：1st, electromagnetic field sensing unit；11st, metal screen layer；12nd, coil windings；2nd, the first opening；3rd, second open
Mouthful；4th, first lead-out terminal；5th, the second lead-out terminal；6th, the 3rd opening；7th, the 4th opening；8th, low-resistance circuit；9th, region；91、
Subregion；10th, 8-shaped loop；101st, loop.
Embodiment
With reference to the accompanying drawings and examples, the utility model is described in detail.
Embodiment one：A kind of isotropism emf sensor, as shown in figure 1, mainly by three electromagnetic field sensing units 1
Composition, the multiturn coil winding 12 that each electromagnetic field sensing unit 1 includes metal screen layer 11, wrapped up by metal screen layer 11,
The first opening 2 and the second opening 3 are symmetrically offered on metal screen layer 11 so that multiturn coil winding 12 is exposed, is opened by first
Metal screen layer 11 is divided into two sections of symmetrical and independent regions 9 by the opening 3 of mouth 2 and second, in the first opening 2 and the second opening
3 are connected to for exporting on multiturn coil winding 12 faradic first lead-out terminal 4 and for exporting metallic shield
Second lead-out terminal 5 of induced voltage on layer 11, and a sampling resistor R is connected with the second 3 both ends of opening, for producing voltage
Drop.The measurement direction of electric-field sensor and magnetic field sensor is marked in Fig. 1, the induced-current that magnetic field is triggered has passed through metal screen
Layer 11 and sampling resistor R are covered, a displacement current is generated at the opening of metal screen layer 11 first 2；In some low-frequency ranges
Under magnetic field environment（Such as 10 hertz）, the first opening 2 and the second opening 3 are it is considered that open circuit, now thinks in metal screen layer 11
There is no induced-current to form loop, thus do not influence the measurement of electric field；But when magnetic field environment is changed into high frequency（It is more than 3K hertz）
Afterwards, the capacitive reactances at the first opening 2 and the second opening 3 can reduce as the change of field frequency is big, now will be the
A displacement current is formed at one opening 2, this displacement current can form loop by metal screen layer 11 and sampling resistor R,
A pseudo- voltage drop is produced on sampling resistor R, influences the measurement of electric field.
To improve the diamagnetic field interference performance of electric field measurement, as shown in Fig. 2 connect with the first opening 2 and the second opening 3 again
The both sides of the perpendicular metal screen layer 11 of line symmetrically offer the 3rd opening 6 and the 4th opening 7 with by the multiturn coil around
Group 12 is exposed, and two sections of independent regions 9 are divided into two sections of independent subregions 91 by the 3rd opening 6 and the 4th opening 7 again respectively;
In same independent region 9, intersected end to end between two sections of independent subregions 91 and be connected with low-resistance circuit 8, form 8 words
Shape loop 10.According to the law of electromagnetic induction, the magnetic flux of 11 envelope surface products of metal screen layer in each 8-shaped loop 10 is kept not
Become, i.e., will not produce induced-current in metal screen layer 11, sampling resistor R is upper because of magnetic field generation during so as to avoid electric field measurement
Induced-current and produce voltage drop；So that the diamagnetic field interference performance enhancing of the electric field measurement of emf sensor, and can be same
When, independence, accurately measure electric field and magnetic field.
It is furthermore preferred that in same independent region 9,8-shaped loop 10 includes two loops 101, two closings
The area equation of loop 101, and face normal orientation is opposite.
Electromagnetic field sensing unit 1 is shaped as circle, and size is diameter 10cm, and the adjacent opening 3 of two first opening 2, second,
Central angle corresponding to 3rd opening 6 and the 4th opening 7 is 90 degree, and the number of turn of coil windings 12 is 12 circles, and low-resistance circuit 8 is copper
Wire, metal screen layer 11 use copper foil.
In isotropism emf sensor of the present utility model, as shown in Figure 2 and Figure 3, three electromagnetic field sensing units 1
Pairwise orthogonal, the opening 6 of first the 2, second opening of opening the 3, the 3rd and the 4th opening 7 are used as the electromagnetic field sensing unit of pairwise orthogonal
1 tie point.
By using low-resistance circuit 8, by two sections of independent subregions 91, interconnection forms 8-shaped to the utility model end to end
Loop 10, is reduced in magnetic field environment（Without electric field）Voltage drop on middle electric-field sensor sampling resistor R.In this way,
The utility model proposes electromagnetic field sensing unit 1 in the diamagnetic field energy power of electric-field sensor obtained significant raising.I.e.
Just because manufacture craft reason, two loops 101 in each 8-shaped loop 10 are unequal, exist in metal screen layer 11
Induced-current, the current loop in the 8-shaped loop 10 with the presence of low-resistance is remained on, electricity can't be produced on sampling resistor R
Pressure drop and the result for changing electric field measurement.
Embodiment two：A kind of isotropism emf sensor, as shown in figure 4, the difference from embodiment one is：Electricity
Magnetic field sensing cell 1 is rectangle, and the position of the opening 6 of first the 2, second opening of opening the 3, the 3rd and the 4th opening 7 is in each edge
Center.
Described above is only preferred embodiment of the present utility model, and the scope of protection of the utility model is not limited merely to
Above-described embodiment, all technical schemes belonged under the utility model thinking belong to the scope of protection of the utility model.It should refer to
Go out, for those skilled in the art, some improvement under the premise of the utility model principle is not departed from and
Retouching, these improvements and modifications also should be regarded as the scope of protection of the utility model.
Claims (6)
- A kind of 1. isotropism emf sensor, mainly by least one electromagnetic field sensing unit（1）Composition, its feature exist In：Each electromagnetic field sensing unit（1）Including metal screen layer（11）, by metal screen layer（11）The multiturn coil of parcel Winding（12）, in the metal screen layer（11）On symmetrically offer the first opening（2）With the second opening（3）With by multiturn coil Winding（12）It is exposed, by the first opening（2）With the second opening（3）By metal screen layer（11）It is divided into two sections of independent regions （9）, in the described first opening（2）With the second opening（3）It is connected to for exporting multiturn coil winding（12）Upper induced electricity The first lead-out terminal of stream（4）With for exporting metal screen layer（11）Second lead-out terminal of upper induced voltage（5）, with first Opening（2）With the second opening（3）The perpendicular metal screen layer of line（11）Both sides symmetrically offer the 3rd opening（6） With the 4th opening（7）With by the multiturn coil winding（12）It is exposed, the 3rd opening（6）With the 4th opening（7）Respectively will Two sections of independent regions（9）It is divided into two sections of independent subregions（91）；Same independent region（9）In, two sections of independent sons Region（91）Between end to end by being provided with low-resistance circuit（8）Intersecting connection, forms 8-shaped loop（10）.
- A kind of 2. isotropism emf sensor according to claim 1, it is characterised in that：Same independent region （9）In, the 8-shaped loop（10）Including two loops（101）, two loops（101）Area equation, and Face normal orientation is opposite.
- A kind of 3. isotropism emf sensor according to claim 1 or 2, it is characterised in that：The electromagnetic field passes Feel unit（1）There are three, three electromagnetic field sensing units（1）Pairwise orthogonal.
- A kind of 4. isotropism emf sensor according to claim 1 or 2, it is characterised in that：The electromagnetic field passes Feel unit（1）For circle, adjacent two first opening（2）, second opening（3）, the 3rd opening（6）With the 4th opening（7）Institute Corresponding central angle is 90 degree.
- A kind of 5. isotropism emf sensor according to claim 1 or 2, it is characterised in that：The electromagnetic field passes Feel unit（1）For rectangle, first opening（2）, second opening（3）, the 3rd opening（6）With the 4th opening（7）Position it is equal At the center of each edge.
- A kind of 6. isotropism emf sensor according to claim 1 or 2, it is characterised in that：The coil windings （12）The number of turn be 12 circles.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721262307.4U CN207215908U (en) | 2017-09-28 | 2017-09-28 | A kind of isotropism emf sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721262307.4U CN207215908U (en) | 2017-09-28 | 2017-09-28 | A kind of isotropism emf sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115117629A (en) * | 2022-08-09 | 2022-09-27 | 沈阳铁路信号有限责任公司 | Loop antenna shielding structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115117629A (en) * | 2022-08-09 | 2022-09-27 | 沈阳铁路信号有限责任公司 | Loop antenna shielding structure |
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Address after: 314400 building 1-2, No. 2, No. 128, double Road, Haining Economic Development Zone, Haining City, Jiaxing, Zhejiang Co-patentee after: TSINGHUA University Patentee after: Zhejiang Xinxi Communication Co., Ltd Address before: 314400 building 1-2, No. 2, No. 128, double Road, Haining Economic Development Zone, Haining City, Jiaxing, Zhejiang Co-patentee before: TSINGHUA University Patentee before: ZHEJIANG TIANCHUANG XINCE COMMUNICATION TECHNOLOGY Co.,Ltd. |