CN108227013A - A kind of reception device for transient electromagnetic exploration - Google Patents
A kind of reception device for transient electromagnetic exploration Download PDFInfo
- Publication number
- CN108227013A CN108227013A CN201810084691.6A CN201810084691A CN108227013A CN 108227013 A CN108227013 A CN 108227013A CN 201810084691 A CN201810084691 A CN 201810084691A CN 108227013 A CN108227013 A CN 108227013A
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- coil
- reception device
- shielded
- receiving coil
- receiving
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
Abstract
The present invention provides it is a kind of for transient electromagnetic exploration reception device, including：Bearing structure, receiving coil, shielded coil；Receiving coil is fixed in bearing structure, for receiving magnetic field signal；Shielded coil is fixed on the inside of receiving coil, for shielding coupling of the transmitting coil to receiving coil.The present invention can reduce the overall weight of system, and the height of shielded coil is adjustable, best shield effectiveness can be reached for different transmitting coils, so as to be adapted to different transient electromagnetic systems, without for the individually designed shielded coil of each transient electromagnetic system.
Description
Technical field
The present invention relates to transient electromagnetic exploration engineering field more particularly to a kind of reception dresses for transient electromagnetic exploration
It puts.
Background technology
Geophysics electromagnetism (EM) technology is being determined from earth's surface the depth about soil of three kms, rock and other conductions
Can be effective during the conductivity of substance.Those are engaged in metal and the map of uranium deposit, water-bearing layer and other geologic(al) formations is painted
The personnel of system are extremely interested to the distribution of conductivity under such depth.
Geophysics EM methods be related to the magnetic field changed over time as caused by main field to Near Ground measurement and
The modeling of earth conductivity distribution.These magnetic fields or the periodic current by applying to transmitter generate or by being derived mainly from ground
The spontaneous electromagnetic field of lightning in ball air generates.The EM square roots that can have with both earth conductivity and frequency
The proportional feature ground penetrating depth of inverse.
In the conventional method, (up to three of the derivative dB/dt of field vs. time be can measure using receiver coil system
Quadrature component) or magnetometer (measuring magnetic field B) measurement magnetic field signal.Then the analog signal received is amplified, filtered and led to
Excessively high resolution ratio high-speed AD converter (ADC) is digitized, and can be by the data with being obtained from global positioning system (GPS)
Location information store together.Data Post is related to the electrically and physically modeling to the earth, to generate geophysics conductivity
Isogram.
Existing EM systems include measurement and aerial measurement based on ground.Aerial survety result by using aircraft and
Helicopter is collected.Aerial survety method is useful for large area measurement, and available for being buried in resistive sill
Electric conductivity exploration, geographic drawing, hydrogeology and environmental monitoring.Existing airborne electromagnetic (AEM) system is such
Work：When aircraft or helicopter are with line of the nearly constant speed (such as respectively reaching 75m/s or 30m/s) along almost parallel equidistant
Road (such as 50m to 200m) obtains data to approach during constant terrain clearance (such as about 120m or 30m respectively) flight.With rule
Spacing measures, and the rule spacing is usually in the range of lm to 100m.
For receiving coil, the coil for having magnetic core and the air core coil without magnetic core can be divided into.In airborne electromagnetic survey, examine
Stability and easy to install is considered, mostly using air core coil.
For the airborne electromagnetic system of mainstream, particularly helicopter electromagnetic system, receiving coil is with transmitting coil apart from very
Closely, receiving coil is easily by the electromagnetic interference of transmitting coil.Current receiving coil all do not have can shield transmitting coil coupling
Function of shielding.Therefore, to reach the influence of removal transmitting coil coupling, scheme that there are two types of mainstreams：First, by receiving coil
The top on transmitting coil one side is placed on, it is 0 to make the magnetic flux that transmitting coil generates in receiving coil, but this method needs
Carry out fixed reception coil using a device, and require for Hard link between transmitting coil and receiving coil, this causes system
Overall weight is bigger than normal, it is difficult to do greatly, such as SkyTEM systems；Second is that receiving coil and transmitting coil are placed on coplanar with one heart
Position then between two coils plus a bucking coil, the big electric current such as reversely is added in bucking coil, makes bucking coil
With the magnetic flux of generation of the transmitting coil in receiving coil and it is 0, the distance of receiving coil and transmitting coil under this mode
Remote compared with the first, transmitting coil can be flexible coupling with receiving coil, but under this mode, and transmitting coil and bucking coil are expired
Sufficient relationship：Rt/Nt≈Rb/Nb.Wherein, RtFor the radius of transmitting coil, NtThe number of turn for transmitting coil；RbHalf for bucking coil
Diameter, NbThe number of turn for bucking coil.Visible emission coil is bigger, and bucking coil is bigger, needs increased weight also bigger,
Such as VTEM.On the other hand, due in sense of current and transmitting coil in bucking coil sense of current on the contrary, bucking coil
Reversed magnetic moment can be generated, influences the total transmitting magnetic moment of system.Bucking coil generate reversed magnetic moment beIt can be seen that
Radius is bigger, and the reversed magnetic moment of generation is bigger.
For the system of current VTEM series, the bucking coil of corresponding size can be all configured by often covering system.But in reality
Border manufacturing process either makes in installation process the size of bucking coil or position generate deviation.It can not be adjusted after installation is complete,
Cause the presence of the remaining energy coupled by transmitting coil in receiving coil.
Invention content
In view of above-mentioned technical problem, the purpose of the present invention is to provide a kind of reception devices for transient electromagnetic exploration.
The present invention can adjust the height of shielded coil, so as to reach the best shield effectiveness for being directed to different transmitting coils.The present invention's
Reception device can be used not only in aviation transient electromagnetic device, can be also used in the transient electromagnetic exploration of ground.
In order to achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of reception device for transient electromagnetic exploration, including：
Bearing structure；
Receiving coil is fixed in bearing structure, for receiving magnetic field signal；
Shielded coil is fixed on the inside of receiving coil, for shielding coupling of the transmitting coil to receiving coil.
(3) advantageous effect
It can be seen from the above technical proposal that reception device of the present invention for transient electromagnetic exploration at least has with following
One of beneficial effect：
(1) shielded coil is integrated into reception device by the present invention, can not only be compatible with the usage scenario of original receiving coil,
It can also solve in helicopter transient electromagnetic system, transmitting coil is to the close coupling problem of receiving coil；
(2) present invention inside reception device using shielded coil, in helicopter transient electromagnetic system, relative to connecing
A bucking coil is added to offset the coupling that transmitting coil is brought outside receiving apparatus, reduces the overall weight of system；
(3) present invention uses shielded coil inside reception device, in helicopter transient electromagnetic system, in reception device
The reversed magnetic moment that portion's shielded coil generates can be neglected relative to the magnetic moment that transmitting coil generates, and not with the big of transmitting coil
It is small change and changes, make system effectively emit magnetic moment greatly improve；
(4) height of the invention by adjusting shielded coil, can be adapted to different systems, without independent for each system
A shielded coil is designed, greatly facilitates the development of system；
(5) present invention is by adjusting the height of shielded coil, can solve due to manufacture craft error cause calculated value with
The problem of field that transmitting coil generates caused by theoretical value is inconsistent cannot be thus completely shielded；
(6) height of the invention by adjusting shielded coil, relative to adjusting shielded coil size or position, it is easier to grasp
Make and realize；
(7) for the present invention by the way that shielded coil is integrated into reception device, it is Hard link to make shielded coil and receiving coil
Structure, making helicopter transient electromagnetic system, the position of shielded coil and receiving coil can remain fixed in flight course, improve
The stability of shield effectiveness, so as to substantially increase the quality of receiving coil acquisition signal.
Description of the drawings
Fig. 1 is the structure diagram of reception device of the embodiment of the present invention.
Fig. 2 is the vertical view of reception device of the embodiment of the present invention.
Fig. 3 is the schematic diagram that reception device of the embodiment of the present invention coordinates transmitting coil to use.
Fig. 4 is grounded schematic diagram for reception device of embodiment of the present invention shielded coil.
【Main element】
1 bearing structure；
2 receiving coils；
3 supporting rods；
4 shielded coils；
5 support platforms；
6 transmitting coils.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
In an exemplary embodiment of the present invention, a kind of reception device for transient electromagnetic exploration is provided, including：
Bearing structure, receiving coil, shielded coil.Receiving coil is fixed in bearing structure, for receiving magnetic field signal；Shielded coil
The inside of receiving coil is fixed on, for shielding coupling of the transmitting coil to receiving coil.
In the present embodiment, reception device further includes a support construction, and shielded coil is fixed on reception by support construction
The inside of coil.Support construction includes a support platform, and shielded coil is fixed in support platform, such as the side of support platform
Edge.
As a kind of specific embodiment, bearing structure includes a planar structure and a hollow protrusion, hollow protrusion position
In in planar structure, receiving coil is fixed in planar structure, and support construction is fixed in hollow protrusion.Preferably, it is hollow convex
It can be hollow cylinder to rise.
Wherein, the support construction further includes a supporting rod, is arranged on the inside of hollow protrusion, and support platform is fixed on branch
On strut, shielded coil is made to play different shield effectiveness by the height for adjusting support platform.Specifically, it is set on supporting rod
Thread segment, thread segment can be threadedly coupled in the bottom end of supporting rod with planar structure；Thread segment can also supporting rod other
Position is threadedly coupled with support platform.
Fig. 1 is the structure diagram of reception device of the embodiment of the present invention.As shown in Figure 1, the present invention surveys for transient electromagnetic
The reception device of spy includes：Bearing structure 1, receiving coil 2, screwed supporting rod 3, shielded coil 4, support platform 5.
Bearing structure 1 is in hat-shaped, and receiving coil 2 is fixed on the lower surface of the brim position of bearing structure 1, carrying knot
1 center of structure is there are one prominent hollow cylinder, there are one screwed supporting rod 3 on the axis of cylinder, has on supporting rod
There is a circle shielded coil 4 at one support platform 5, the edge of support platform 5.By the supporting rod 3 at rotating cylindrical body axle center, make
Support platform is located at different height, plays different shield effectiveness.Receiving coil 2 and shielded coil 4 can be circle.
It is worth noting that shielded coil 4 primarily serves coupling of the shielding transmitting coil to receiving coil, receiving
In device, shielded coil 4 is not to be closed, and the head and the tail of shielded coil 4 are connected respectively to two contacts A and B of reception device
On, as shown in Figure 2.
It, can be by contact A, B when reception device is used for helicopter transient electromagnetic system as a kind of specific embodiment
With 6 differential concatenation of transmitting coil, emission current is made to flow into shielded coil.One of which implementation is as shown in Figure 3.
Shielded coil is made to reach best shield effectiveness, that is, is completely counterbalanced by the magnetic that transmitting coil generates in receiving coil
Flux has：
Φpr+Φtr=0 (1)
Wherein, ΦtrFor the magnetic flux that transmitting coil generates in receiving coil, ΦprIt is shielded coil in receiving coil
The magnetic flux of generation.According to the relationship (Φ=MI) between magnetic flux and mutual inductance, electric current, can obtain：
Mpr=Mtr (2)
By the mutual inductance formula of two parallel coaxial circular coils：
Wherein, μ0For space permeability, N1,N2The number of turn of respectively two parallel coils, r1,r2Respectively two parallel lines
The radius of circle.K is parameter, and expression formula is
Vertical ranges of the wherein d between two parallel coils.
K (k) and E (k) is the first kind and second class Legendre's complete elliptic integral, expression formula are：
Transmitting coil and receiving coil are coplanar, therefore vertical range is 0, and the shielded coil in reception device is with receiving line
The vertical range of circle is the height d to be adjusted.
It, can be in the hope of the value of d according to the relationship of magnetic flux.Shielded coil is adjusted to from the ground that receiving coil height is d
Side, it is possible to reach preferable shield effectiveness.
It is practical due to installation accuracy etc., the best screening height of shielded coil may slightly go out with theoretical calculation
Enter, need the response in receiving coil at this time to being highly finely adjusted.If there is remaining primary field, illustrate to shield endless
Entirely, it needs to turn down the height of shielded coil；Conversely, then the height of shielded coil is turned up.
When the transmitting coil for using different size and the number of turn, the height that shielded coil needs are adjusted is also inconsistent.Shielding
The adjustment height range of coil determines the range of matched transmitting coil number of turn radius ratio.
It is smaller from the height of receiving coil by (3) formula it is found that for shielded coil, the magnetic flux generated in receiving coil
Amount is bigger.
For transmitting coil, when its radius differs larger with receiving coil radius (such as：VTEM systems, transmitting coil half
Diameter is 13m, receiving coil 0.6m), the magnetic field that transmitting coil generates in receiving coil, which can be regarded as, uniformly waits big, is
Wherein, NtFor the number of turn of transmitting coil, I is the electric current in transmitting coil, RtRadius for transmitting coil.Therefore emit
The magnetic flux that coil generates in receiving coil is
Φtr=BSr (7)
Wherein SrArea for receiving coil.
By (6) (7) formula it is found that the radius turn ratio of transmitting coil is smaller, the magnetic induction intensity in receiving coil is bigger,
The magnetic flux of generation is bigger.
As another specific embodiment, when reception device is for ground transient electromagnetic, such as big fixed source-loop,
Transmitting coil is far from receiving coil, and the field that transmitting coil generates in receiving coil can be neglected, therefore need not be to emission lines
The field that circle generates is shielded, can be by the contact A that the head and the tail with shielded coil are connect, and B is grounded, as shown in figure 4, to prevent from shielding
Induced electromotive force is generated in coil to have an impact the measurement result of receiving coil.
Receiving coil radius is 0.6m in one of the embodiments, and the radius of shielded coil is 0.3m, shielded coil
Adjustment height ranging from 0~0.5m.Under unitary current, the magnetic flux ranging from 125.7 that is generated in receiving coil~
329.2pWb.By calculate it is found that the reception device can matched transmitting coil radius turn ratio ranging from R/N ∈
(2.16,5.65), the range are compatible with VTEM system transmitting coils all currently on the market, and design parameter is as shown in the table：
So far, attached drawing is had been combined to the present invention have been described in detail.According to above description, those skilled in the art should
When the reception device for being used for transient electromagnetic exploration to the present invention has clear understanding.
It should be noted that in attached drawing or specification text, the realization method that is not painted or describes is affiliated technology
Form known to a person of ordinary skill in the art in field, is not described in detail.In addition, the above-mentioned definition to each element and method is simultaneously
Various concrete structures, shape or the mode mentioned in embodiment are not limited only to, those of ordinary skill in the art can carry out letter to it
It singly changes or replaces, such as：
Receiving coil and shielded coil can also be rectangular or other polygons forms.
It should also be noted that, the demonstration of the parameter comprising particular value can be provided herein, but these parameters are without definite etc.
In corresponding value, but analog value can be similar in acceptable error margin or design constraint.The side mentioned in embodiment
To term, such as " on ", " under ", "front", "rear", "left", "right" etc., only it is the direction of refer to the attached drawing, is not used for limiting this
The protection domain of invention.In addition, unless specifically described or the step of must sequentially occur, the sequences of above-mentioned steps there is no restriction in
It is listed above, and can change or rearrange according to required design.And above-described embodiment can be based on design and reliability
Consider, the collocation that is mixed with each other is used using or with other embodiment mix and match, i.e., the technical characteristic in different embodiments can be with
Freely form more embodiments.
In conclusion the present invention provides a kind of reception device for transient electromagnetic exploration, shielded coil is tied by supporting
Structure is fixed on coaxial position parallel with receiving coil, and the height of shielded coil is adjustable, is directed to not so as to reach
With the best shield effectiveness of transmitting coil.The reception device can be used not only in the exploration of aviation transient electromagnetic, can be also used for ground
In the transient electromagnetic exploration of face.
It should be noted that the present invention will be described rather than limits the invention, and ability for above-described embodiment
Field technique personnel can design alternative embodiment without departing from the scope of the appended claims.In the claims,
Any reference mark between bracket should not be configured to limitations on claims.Word "comprising" does not exclude the presence of not
Element or step listed in the claims.Word "a" or "an" before element does not exclude the presence of multiple such
Element.The present invention can be by means of including the hardware of several different elements and being come by means of properly programmed computer real
It is existing.If in the unit claim for listing equipment for drying, several in these devices can be by same hardware branch
To embody.The use of word first, second, and third does not indicate that any sequence.These words can be explained and run after fame
Claim.
It should be noted that through attached drawing, identical element is represented by same or similar reference numeral.In the following description,
Some specific embodiments are only used for description purpose, and should not be construed has the present invention any restrictions, and only the present invention is real
Apply the example of example.When the understanding of the present invention may be caused to cause to obscure, conventional structure or construction will be omitted.It should be noted that figure
In the shape and size of each component do not reflect actual size and ratio, and only illustrate the content of the embodiment of the present invention.
Particular embodiments described above has carried out the purpose of the present invention, technical solution and advantageous effect further in detail
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the guarantor of the present invention
Within the scope of shield.
Claims (9)
1. a kind of reception device for transient electromagnetic exploration, including：
Bearing structure；
Receiving coil is fixed in bearing structure, for receiving magnetic field signal；
Shielded coil is fixed on the inside of receiving coil, for shielding coupling of the transmitting coil to receiving coil.
2. reception device according to claim 1, wherein, it further includes：
Support construction, the shielded coil are fixed on the inside of receiving coil by support construction.
3. reception device according to claim 2, wherein, the support construction includes a support platform, and shielded coil is solid
It is scheduled in support platform.
4. reception device according to claim 3, wherein, the bearing structure is hollow convex including a planar structure and one
It rises, hollow protrusion is located in planar structure, and receiving coil is fixed in planar structure, and support construction is fixed in hollow protrusion.
5. reception device according to claim 4, wherein, the support construction further includes a supporting rod, and the support is flat
Platform is fixed on supporting rod,.
6. reception device according to claim 5, wherein, the height of the support platform is adjustable, by adjusting branch
The height of support platform makes shielded coil play different shield effectiveness.
7. reception device according to claim 6, wherein, it is provided with thread segment on the supporting rod.
8. reception device according to claim 7, wherein,
The thread segment is arranged on the bottom end of supporting rod, and supporting rod is threadedly coupled with the planar structure；
The thread segment is arranged on the bottom end above section of supporting rod, and supporting rod is threadedly coupled with the support platform.
9. according to claim 1-8 any one of them reception devices, wherein, the shielded coil and receiving coil to be round or
It is rectangular；The shielded coil is non-closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810084691.6A CN108227013A (en) | 2018-01-29 | 2018-01-29 | A kind of reception device for transient electromagnetic exploration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810084691.6A CN108227013A (en) | 2018-01-29 | 2018-01-29 | A kind of reception device for transient electromagnetic exploration |
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| CN108227013A true CN108227013A (en) | 2018-06-29 |
Family
ID=62669048
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| CN201810084691.6A Pending CN108227013A (en) | 2018-01-29 | 2018-01-29 | A kind of reception device for transient electromagnetic exploration |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109167443A (en) * | 2018-11-02 | 2019-01-08 | 宁波微鹅电子科技有限公司 | Wireless charging attachment device, wireless charging transmitting terminal, receiving end and system |
| CN109270579A (en) * | 2018-10-29 | 2019-01-25 | 中国有色金属工业昆明勘察设计研究院有限公司 | Transient electromagnetic reception device for small-sized more rotor low latitudes unmanned plane |
| CN110361785A (en) * | 2019-06-21 | 2019-10-22 | 中国科学院地质与地球物理研究所 | A kind of aviation transient electromagnetic method reception compensation device |
| CN111273359A (en) * | 2020-02-17 | 2020-06-12 | 北京航空航天大学 | Coil structure of high signal-to-noise ratio differential metal transceiving detector and detector thereof |
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| CN111273359A (en) * | 2020-02-17 | 2020-06-12 | 北京航空航天大学 | Coil structure of high signal-to-noise ratio differential metal transceiving detector and detector thereof |
| CN111273359B (en) * | 2020-02-17 | 2021-05-11 | 北京航空航天大学 | Coil structure of high signal-to-noise ratio differential metal transceiving detector and detector thereof |
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