CN202522711U - Primary field excitation device based on transient electromagnetic method - Google Patents
Primary field excitation device based on transient electromagnetic method Download PDFInfo
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- CN202522711U CN202522711U CN2012201137718U CN201220113771U CN202522711U CN 202522711 U CN202522711 U CN 202522711U CN 2012201137718 U CN2012201137718 U CN 2012201137718U CN 201220113771 U CN201220113771 U CN 201220113771U CN 202522711 U CN202522711 U CN 202522711U
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Abstract
The utility model relates to the TEM detection technology, and discloses a primary field excitation device based on the transient electromagnetic method. The primary field excitation device includes a transmitting antenna which can generate the transient electromagnetic field. The transmitting antenna is a coil array which is composed of at least two coils. The electromagnetic field generated by the coil array is gathered to a set area. The primary field transmitting antenna based on the transient electromagnetic method is changed into the coil array composed of multiple coils from a single coil, and through adjusting the parameters of the coils in the array, the generated electromagnetic field vectors are superposed and then are gathered to the set area, so the divergence of the electromagnetic field generated by the transmitting antenna is greatly improved, the coverage of the primary field is limited, and the convergence of the transmitting antenna is improved. The primary field excitation device based on the transient electromagnetic method is mainly used for the electromagnetic detection field, such as the mine locating, the underground pipeline detection, and the metal detection.
Description
Technical field
The utility model relates to the electromagnetic surveying technology, and particularly a kind of TDEM (Time domain electromagnetic method) is also referred to as transient electromagnetic method (Transient Electromagnetic Method is abbreviated as TEM) Detection Techniques.
Background technology
Transient electromagnetic method (TEM) is a kind of electromagnetic surveying technology, is mainly used in metal detection and mineral wealth and surveys, and transient electromagnetic method utilization in metallic conduit state (as: average thickness, extent of corrosion, seepage etc.) assessment is comparatively extensive.TEM utilizes the instantaneous variation generation pulse electromagnetic wave of electric current in the emitting antenna (to be called electromagnetic field one time; Or primary field); Under the excitation of an electromagnetic field, testee is inner because electromagnetic induction will produce time dependent induction current, and this induction current is spatial excitation secondary electromagnetic field (abbreviating secondary field as) around again; The inner structure state and the parameter correlation of this secondary field and measured conductor; Like the medium carried in caliber, material, pipe thickness, the pipe etc., this pulse ringing response has temporal separability, and this is the TEM technical foundation that realizes that pipeline conditions detects.Utilize receiving antenna to receive this secondary electromagnetic field on this basis, analyze and itself and the change of time relation of research, just can carry out quantitatively and qualitative evaluation the current state of target pipeline.Prior art is used to produce the emitting antenna of an electromagnetic field; Usually adopt a rectangle or toroid winding (to be generally planar coil; Structure is referring to Fig. 1, Fig. 2 and Fig. 3); The electric current that flows through coil through control produces sudden change, excites the metallic conductor of primary field overlay area to produce the secondary electromagnetic field radiation.The emitting antenna that constitutes with square coil is an example, and the primary field coverage of its generation is approximately the square of the length of side=L+2h, and wherein, L is the emitting antenna length of side, and h is an investigation depth.Because emitting antenna output energy is relevant with L, in order to obtain certain excitation energy, the L value can not be too little.Can find out that the primary field coverage that this emitting antenna produces is dispersed, along with the increase of investigation depth, the electromagnetic field coverage increases, and electromagnetic field covers the pipeline section expanded range.For parallel, intersect or near pipeline, perhaps have other metal objects near the tested pipeline, because the secondary electromagnetic field phase mutual interference that they produce causes accuracy of detection to reduce, even can't differentiate useful signal and undesired signal.
The utility model content
The utility model technical matters to be solved just provides a kind of primary field exciting bank based on transient electromagnetic method.
The utility model solve the technical problem; The technical scheme that adopts is; Primary field exciting bank based on transient electromagnetic method comprises the emitting antenna that is used to produce transient electromagnetic field, it is characterized in that; Said emitting antenna is made up of the coil array that at least 2 coils constitute, and the electromagnetic field that said coil array produces converges to regions.
According to the principle of TEM, the primary field coverage that emitting antenna produces is littler, and the precision of measurement is higher.Therefore; The utility model combines magnetic confinement method and transient electromagnetic method; Change transient electromagnetic method primary field emitting antenna into coil array that a plurality of coils are formed by single coil,, converge to regions after making the electromagnetic field vector stack of its generation through the correlation parameter of each coil in the adjustment array; Improved the diversity of the electromagnetic field of emitting antenna generation greatly, made the coverage of primary field receive constraint.The magnetic confinement method of utilizing the utility model has improved the performance that converges of emitting antenna; Can effectively avoid the interference of metal medium on every side when surveying; Can effectively overcome and discharge pipe to the influence of testing result; Depth of investigation can improve, and can measure interior conduit parameter among a small circle more accurately, like pipeline section average thickness, diameter, corrosion situation etc.
The electromagnetic field that emitting antenna produces; Relevant with size of current, phase place (comprising direction of current) that coil midstream is crossed; Size of current and phase place thereof through each coil in the array of controls can reach the purpose of synthetic electromagnetic field vector direction of control and size, thereby the electromagnetic field of coil array generation is converged to regions.
In the array shape of each coil and relative position thereof all with the size of the synthetic electromagnetic field vector of coil array, direction and the relation that is distributed with; Suitably adjust the shape and/or the relative position of each coil, the electromagnetic field that coil array is produced converges to regions.
Preferably, said coil array is made up of 2 coils.
The array structure that is made up of 2 coils is the simplest, and its synthetic electromagnetic field vector is controlled easily, and analytical calculation is also fairly simple.Particularly realize having practical significance on the engineering easily.
Concrete, said 2 coils lay respectively in 2 parallel planes, its on said plane the projection of vertical direction join or have at least and overlap.
This scheme is utilized 2 distributions that are positioned at plane-parallel coil configuration adjustment external electromagnetic field, through adjusting vertical range, lap size and shape etc. between 2 coils, can control synthetic electromagnetic field and converge direction and position in the space.2 coils can join or overlap in the projection of its plane vertical direction, join to being appreciated that to lap to be 0 situation.Generally speaking, for the coil of overlay configuration in two parallel planes, synthetic electromagnetic field mainly concentrates on 2 coil lap institute region covered, and promptly the electromagnetic field of this coil array generation converges to lap institute region covered.
Further, dispose tertiary coil, said tertiary coil plane, place and said 2 coils place plane parallel at 2 coil laps.
At 2 coil laps configuration tertiary coils, shape that can be through the adjustment tertiary coil, size, allocation position, drive current etc., further converge in the space of the synthetic electromagnetic field of control, dwindles the primary field coverage, improves and converge performance.
Concrete, said 2 loop constructions are identical or different.
Through adjusting the structure of 2 coils, also can control the performance that converges of synthetic electromagnetic field.Loop construction mainly comprises parameters such as shape, size, the number of turn.
More specifically, said coil is square coil or circular coil or triangle coil.
Square coil, circular coil or triangle coil are the fairly simple loop constructions of shape, are convenient to industrialization and generate and use.
Recommend, said triangle coil is isosceles triangle coil or equilateral triangle coil.
Isosceles triangle coil or equilateral triangle coil can be saved wire rod under the identical situation of the coiling number of turn.And in the test, the array that adopts 2 identical equilateral triangle coils of structure to constitute, electromagnetic field converges characteristic can be improved obviously, and the resultant vector adjustment is also more convenient.
Further, two limits of two limits joining of said isosceles triangle coil or equilateral triangle coil or lap are parallel.
Evidence, this configuration mode is to adopt isosceles triangle coil or the preferable configuration mode of equilateral triangle coil, it is good to have the performance of converging, characteristics easy to adjust.
Special, said two bases that the limit is isosceles triangle coil or equilateral triangle coil.
This coil configuration mode is particularly suitable for the configuration of 2 isosceles triangle coils, can improve the performance that converges of electromagnetic field space distribution.
The beneficial effect of the utility model is, utilizes coil array to form emitting antenna, can be as required spatial configuration through each coil in the adjustment array; Like relative position, distance; The size of current of each coil, phase place etc. make primary field constrain in setting range, can effectively avoid the interference of surrounding environment metal medium during detection; Be particularly conducive to and solve the practical problems of pipe detection side by side; Can enlarge investigation depth, measure interior conduit average thickness among a small circle more accurately, improve the precision and the accuracy of corrosion detective, metal detection, mineral products detection.
Description of drawings
Fig. 1 is a prior art rectangle sending antenna structure synoptic diagram;
Fig. 2 is a prior art loop transmit antenna structural representation;
Fig. 3 is the enlarged diagram of P-P section among Fig. 1 and Fig. 2;
Fig. 4 is the coils array construction synoptic diagram of embodiment 1;
Fig. 5 is the vertical view of Fig. 4;
Fig. 6 is the coils array construction synoptic diagram of embodiment 2;
Fig. 7 is the vertical view of Fig. 6;
Fig. 8 is the coils array construction synoptic diagram of embodiment 3;
Fig. 9 is the vertical view of Fig. 8;
Figure 10 is the coils array construction synoptic diagram of embodiment 4;
Figure 11 is the vertical view of Figure 10;
Figure 12 is the coils array construction synoptic diagram of embodiment 5;
Figure 13 is the vertical view of Figure 12;
Figure 14 a-f is electromagnetic field distributed simulation figure.
Wherein, 10---lead; 11---insulating medium; 1---first coil; 2---second coil; 3---tertiary coil; The area of space that A---first coil and the second coil lap cover; The area of space that B---first coil, second coil and tertiary coil lap cover; Distance between a---the tertiary coil and first coil; Distance between L---first coil and second coil; D---first coil and the second coil lap length; I1, I2 and I3 are respectively the drive current of first coil, second coil and tertiary coil.
Embodiment
Below in conjunction with accompanying drawing and embodiment, describe the technical scheme of the utility model in detail.
The loop construction that the prior art emitting antenna adopts such as Fig. 1, Fig. 2 and shown in Figure 3.Can find out that from sectional view Fig. 3 Fig. 1, Fig. 2 are respectively the rectangle and the toroid windings of 19 circles.The primary field that this emitting antenna produces is dispersed, and Figure 14 a has provided the square coil of length of side 50cm, and CW feeds the drive current of 1A, at the electromagnetic field distributed simulation figure apart from coil plane 100cm place.
The utility model is according to the principle of TEM, and the primary field that emitting antenna is produced retrains, and changes transient electromagnetic method primary field emitting antenna into be made up of a plurality of coils coil array by single coil, and the coil of these forming arrays is called subcoil.The transmitting antenna array of the utility model can be through locus, shape, size, the drive current (comprising size of current, phase place) of each sub-coil in the adjustment array, converges to regions after making the electromagnetic field vector stack of its generation.The utility model has improved the diversity of the electromagnetic field of single transmitting coil generation greatly, makes the coverage of primary field receive constraint.The magnetic confinement method of utilizing the utility model has improved the performance that converges of emitting antenna; Can effectively avoid the interference of metal medium on every side when surveying; Effectively overcome and discharge pipe to the influence of testing result; Depth of investigation can improve, and can measure interior conduit parameter among a small circle more accurately, like pipeline section average thickness, diameter, corrosion situation etc.Following embodiment describes the coils array construction of the utility model; Need to prove; Following embodiment only is used to explain the utility model, and the coils array construction that it can not limit the utility model more should not be interpreted as the qualification to the utility model with it.
This example comprises the emitting antenna and the feed system thereof that are used to produce transient electromagnetic field based on the primary field exciting bank of transient electromagnetic method.The array that the coil that this routine emitting antenna is 60cm by 2 length of sides constitutes is formed, like Fig. 4 and shown in Figure 5.2 coils lay respectively in two parallel planes, and the distance between two parallel planes is L, and first coil 1 overlaps in the projection on plane, second coil, 2 place, and lap length is d.The transmitting antenna array of this structure, 2 coil overlapping region A are zones that synthetic electromagnetic field converges, Figure 14 b has provided L=3cm; D=6cm; Drive current is 1A, the coil array that direction of current is as shown in Figure 4, the electromagnetic-field simulation figure at distance 100cm place, plane, second coil, 2 place.The transmitting antenna array of this structure can be adjusted the zone of converging of the synthetic electromagnetic field of coil array through size of current, phase place and the distance L of each sub-coil of control, the value of length d, satisfies the needs of different detection systems.
Fig. 6 and Fig. 7 show this routine launching antenna array array structure.In fact this be exactly among the embodiment 1, the situation of d=0.This is the situation that 2 sub-coil are joined, and this transmitting antenna array can be through adjusting the zone of converging of 2 sub-coil electric currents, the synthetic electromagnetic field of distance L control.
This routine launching antenna array is listed in 2 coil laps and disposes tertiary coil 3, referring to Fig. 8 and Fig. 9.Subcoil plane, 3 place and this 2 coil place plane parallel.Figure 14 c has provided the electromagnetic field distributed simulation figure at distance 100cm place, plane, second coil, 2 place.Simulated conditions is: coil 1 and coil 2 are the square of length of side 60cm, by direction input drive current 1A shown in Figure 8; Tertiary coil 3 is the square coil of 60 * 42cm, by direction input drive current 1A shown in Figure 8; L=a=3cm, d=6cm.Comparison diagram 14b and Figure 14 c can find out; It is circular by oval convergence that configuration tertiary coil 3 distributes electromagnetic field; Through adjusting the various parameters in this routine coil array, converge direction, position and electromagnetic field distribution shape like what a, L, d, I1, I2, I3 etc. can control electromagnetic field.This embodiment electromagnetic field can be concentrated to 3 coil lap region covered B.
Embodiment 4
This routine first coil 1 is 2 equilateral triangle coils that structure is identical with second coil 2, and its length of side is 80cm, lays respectively at two in the parallel plane of L, configuration relation such as Figure 10 and shown in Figure 11.This routine coil array electromagnetic field region covered also is mainly to concentrate on first coil 1 and second coil, 2 overlapping region covered A, can control electromagnetic field through the parameter L among the adjustment figure, d, I1, I2 and converge direction, position and distribution shape etc.Figure 14 d has provided the synthetic electromagnetic field distributed simulation figure of this routine coil array at distance 100cm place, plane, second coil, 2 place.Simulated conditions is: first coil 1 and second coil, 2 length of sides are 80cm; I1=1A, the I2=1A direction is shown in figure 10; L=3cm, d=13.856cm.
In this routine coil array, the length of side of equilateral triangle can be chosen the suitable length of side according to demand, and institute's energy requirement is big more, and the length of side is big more.The value of L is two intervals of segmentation: [0,3] and [10 ..], first coil 1 is parallel with e2 with two limit e1 of second coil, 2 laps.Two equilateral triangle coils parallel moving in two parallel planes, the value of overlap length d meets the d=length of side * ratio * 1.732, and wherein, the ratio span is [0,1.2].D=0 during ratio=0, this moment, two equilateral triangle coil two bases joined; Ratio＜0.6, d is less than the height of equilateral triangle, and equilateral triangle two base close together mainly concentrate on two base e1 and the e2 the influence factor of synthesizing electromagnetic field at this moment; Ratio＞0.6, d is greater than leg-of-mutton height, and two equilateral triangle summits are more approaching, and the influence factor that distribute to electromagnetic field this moment is mainly size and the shape of first coil 1 and second coil, 2 overlapping areas A.
Different with the drive current direction of second coil 2 according to first coil 1, this routine coil array drive current has multiple assembled state.Provide the test situation of several kinds of different driving currents combination states below:
1, first coil 1 is the CW electric current, and second coil 2 is the counter-clockwise direction electric current.When ratio got the value of [0.1,0.2] or [1.1,1.2] scope, synthetic electromagnetic field converged and improves obviously, and the electromagnetic field shape is that lateral dimension is greater than longitudinal size when ratio=0.2.
2, first coil 1 and second coil 2 are the CW electric current.Synthetic electromagnetic field converged and improves obviously when ratio got the value of [0.2,1.2] scope, and synthetic electromagnetic field is located central concave in the far field.
3, first coil 1 and second coil 2 are the counter-clockwise direction electric current.When ratio got the value of [0.3,0.7] scope, synthetic electromagnetic field converged and improves obviously, and synthetic electromagnetic field is located central concave in the far field.
4, first coil 1 is the counter-clockwise direction electric current, and second coil 2 is CW electric current (being direction of current shown in Figure 10); Ratio gets the value of [0,0.9] scope, and synthetic electromagnetic field converges and improves obviously, and electromagnetic field distributes and is approximately vertical ellipse during ratio=0.5, and other value electromagnetic fields distribute and are approximately horizontal ellipse.Figure 14 e is under this currents combination state, ratio=0.1, L=3cm, the electromagnetic field distributed simulation figure at distance 100cm place, plane, second coil, 2 place, two equilateral triangle coil overlap length d=80 * 0.1 * 1.732=13.856cm at this moment.This drive current assembled state, synthetic electromagnetic field convergence effect is superior to other currents combination state.
Appeal in 4 kinds of currents combination states, ratio maximum occurrences 1.2 when ratio＞1.2, a plurality of focus points occur though electromagnetic field distributes, but its primary focus focusing effect is not in the ratio value not simultaneously, and focusing effect makes moderate progress equally.
Embodiment 5
This routine coil array is on the coil array basis of embodiment 4, to increase tertiary coil 3 to constitute; Tertiary coil 3 adopts the toroid winding of diameter 60cm; Its plane, place and first coil, 1 place plane parallel and distance are a, and three coil configuration relations of this example are like Figure 12 and shown in Figure 13.This routine d value also satisfies the d=length of side * ratio * 1.732; At first coil, 1 drive current is the CW electric current, and second coil, 2 drive currents are that ratio gets [0.1 under the assembled state of counter-clockwise direction electric current; 0.2] or [1.1; 1.2] during the value of scope, synthetic electromagnetic field converges and improves obviously, electromagnetic field distribution shape lateral dimension is greater than longitudinal size when ratio=0.2.
During ratio=0.1, inject the CW electric current of 1A in the tertiary coil 3, synthetic electromagnetic field focusing performance and energy size all have improvement.
During ratio=1.1, inject the counter clockwise direction electric current of 1A in the tertiary coil 3, synthetic electromagnetic field focusing performance does not almost change, but the energy size increases to some extent.Figure 14 f is this currents combination state, L=a=3cm, the synthetic electromagnetic-field simulation figure of d=80 * 0.1 * 1.732=13.856cm.
Claims (9)
1. based on the primary field exciting bank of transient electromagnetic method; Comprise the emitting antenna that is used to produce transient electromagnetic field; It is characterized in that said emitting antenna is made up of the coil array that at least 2 coils constitute, the electromagnetic field that said coil array produces converges to regions.
2. the primary field exciting bank based on transient electromagnetic method according to claim 1 is characterized in that said coil array is made up of 2 coils.
3. the primary field exciting bank based on transient electromagnetic method according to claim 2 is characterized in that, said 2 coils lay respectively in 2 parallel planes, its on said plane the projection of vertical direction join or have at least and overlap.
4. the primary field exciting bank based on transient electromagnetic method according to claim 3 is characterized in that, disposes tertiary coil at said 2 coil laps, said tertiary coil plane, place and said 2 coils place plane parallel.
5. the primary field exciting bank based on transient electromagnetic method according to claim 3 is characterized in that, said 2 loop constructions are identical or different.
6. the primary field exciting bank based on transient electromagnetic method according to claim 3 is characterized in that, said coil is square coil or circular coil or triangle coil.
7. the primary field exciting bank based on transient electromagnetic method according to claim 6 is characterized in that, said triangle coil is isosceles triangle coil or equilateral triangle coil.
8. the primary field exciting bank based on transient electromagnetic method according to claim 7 is characterized in that, two limits that said isosceles triangle coil or equilateral triangle coil join or two limits of lap are parallel.
9. the primary field exciting bank based on transient electromagnetic method according to claim 8 is characterized in that, said two bases that the limit is isosceles triangle coil or equilateral triangle coil.
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| CN2012201137718U CN202522711U (en) | 2012-03-23 | 2012-03-23 | Primary field excitation device based on transient electromagnetic method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608662A (en) * | 2012-03-23 | 2012-07-25 | 刘冀成 | Detection device based on transient electromagnetic method (TEM) |
| CN109507736A (en) * | 2018-12-12 | 2019-03-22 | 吉林大学 | A kind of novel array transient electromagnetic detecting system and detection method |
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2012
- 2012-03-23 CN CN2012201137718U patent/CN202522711U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608662A (en) * | 2012-03-23 | 2012-07-25 | 刘冀成 | Detection device based on transient electromagnetic method (TEM) |
| CN102608662B (en) * | 2012-03-23 | 2015-04-01 | 刘冀成 | Detection device based on transient electromagnetic method (TEM) |
| CN109507736A (en) * | 2018-12-12 | 2019-03-22 | 吉林大学 | A kind of novel array transient electromagnetic detecting system and detection method |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121107 Termination date: 20160323 |