CN109471180A - A kind of transient electromagnetic apparatus and backoff algorithm - Google Patents
A kind of transient electromagnetic apparatus and backoff algorithm Download PDFInfo
- Publication number
- CN109471180A CN109471180A CN201811617852.XA CN201811617852A CN109471180A CN 109471180 A CN109471180 A CN 109471180A CN 201811617852 A CN201811617852 A CN 201811617852A CN 109471180 A CN109471180 A CN 109471180A
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- coil
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- transmitting coil
- receiving
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- 230000001052 transient effect Effects 0.000 title claims abstract description 30
- 230000004907 flux Effects 0.000 claims abstract description 15
- 230000001939 inductive effect Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 6
- 230000003313 weakening effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 238000005457 optimization Methods 0.000 description 7
- 230000006698 induction Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000000541 pulsatile effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction
Abstract
The invention discloses a kind of transient electromagnetic apparatus, including transmitter, transmitting coil, bucking coil, receiving coil and receiver, the transmitting coil, bucking coil and receiving coil three central coaxial and parallel to each other, the transmitting coil is identical with the diameter of the receiving coil；The bucking coil is connected with the receiving coil and coiling is contrary, and the receiving coil is in the surface of the bucking coil and the transmitting coil；So that the primary field that transmitting coil generates passes through the magnetic flux that bucking coil and receiving coil combine and is consistently equal to 0 or close to 0.Also disclose a kind of backoff algorithm of transient electromagnetic apparatus.The present invention can eliminate the influence of primary field in the case where not weakening secondary field, receive secondary field early signal, and improve the dynamic range of signals of secondary field and receive accuracy.
Description
Technical field
The present invention relates to field of geophysical exploration, more particularly to a kind of transient electromagnetic apparatus and backoff algorithm.
Background technique
Transient electromagnetic method is a kind of important method in field of geophysical exploration, is to utilize earth-free loop line or ground connection
Line source emits pulsatile once electromagnetic field, and the method for observing underground vortex field in pulsatile once interval to underground, at present transient electrical
The universal reception mode of magnetic method is using the change rate in induction coil measurement magnetic field, when being turned off due to emission current, receiving coil
Itself generates induced electromotive force, and is superimposed upon on the induced electromotive force of underground vortex field generation, thus causes transient electromagnetic real
Getting up early distorted signals is surveyed, detection blind area is formed.With railway, highway and the accelerated development of urban infrastructure, shallow engineering
Geological Problems are increasingly significant, realization shallow-layer detected with high accuracy under the conditions of limited space usually required that, for this purpose, the receipts of transient electromagnetic method
It sends out distance and transmitting loop side length is shorter and shorter, coil turn is more and more, however the mutual inductance of dispatch coil is also more and more obvious.
It is mentioned in " a kind of transient electromagnetic measuring equipment and method " (hereinafter referred to as " the preceding case ") of 201410092714.X and utilizes zeroing
Aerial coil eliminates the influence of primary field, and still, this mode also greatly weakens secondary field while eliminating primary field
Intensity.
Summary of the invention
In view of the above shortcomings of the prior art, the present invention provides a kind of transient electromagnetic apparatus and compensation method, Neng Gou
The influence of primary field is eliminated in the case where not weakening secondary field.
In order to solve the above-mentioned technical problem, present invention employs the following technical solutions:
A kind of transient electromagnetic apparatus, including transmitter, transmitting coil, bucking coil, receiving coil and receiver, the hair
Ray circle, bucking coil and receiving coil three central coaxial and parallel to each other, the transmitting coil and the receiving coil
Diameter is identical；The bucking coil is connected with the receiving coil and coiling is contrary, and the receiving coil is in the compensation
The surface of coil and the transmitting coil；So that the primary field that transmitting coil generates passes through bucking coil and receiving coil combines
Magnetic flux be consistently equal to 0 or close to 0.
As optimization, the number of turns that effectively seals in of the transmitting coil, receiving coil and bucking coil is to adjust.
As optimization, the centre distance of the receiving coil and transmitting coil is 0.5-4 times of the transmitting coil diameter.
As optimization, the diameter of the bucking coil be less than the diameter of the transmitting coil and the bucking coil with it is described
For transmitting coil in same level, the bucking coil is identical with the wire type of receiving coil.
As optimization, the diameter of the bucking coil is equal with the diameter of the transmitting coil and is arranged in the emission lines
The top of circle and abut the transmitting coil but not Chong Die with transmitting coil, the wire type of the bucking coil and receiving coil
It is identical.
It is a kind of using a kind of backoff algorithm of transient electromagnetic apparatus of the present invention, comprising the following steps:
S1, the transmitting coil is placed in above region surface to be measured, the bucking coil coaxial arrangement is in the transmitting
The top of coil or same level, the receiving coil coaxial arrangement is in the top of the bucking coil；
S2, be passed through electric current into the launching circuit of transmitting coil, adjust the bucking coil and receiving coil the number of turns and/
Or the number of turns or diameter of the bucking coil, so that the primary field that transmitting coil generates passes through receiving coil and bucking coil combines
Magnetic flux be consistently equal to 0 or close to 0；
S3, a kind of any transient electromagnetic apparatus of claim 1-5 is hung in the air, the receiver records nothing
The pure shutdown of transmitter under poor big resistivity background is along inductive signal；
S4, the signal of receiver normal acquisition is cut to S1 pure shutdown obtained along inductive signal, is exactly accurate two
Secondary field inductive signal.
As optimization, according to detection needs, size, position and the receiving coil and bucking coil of transmitting coil are determined
Position calculates transmitting coil primary field in the vertical magnetic field that receiving coil generates according to transmitting coil magnetic moment parameter, determines transmitting
The number of turns of coil and receiving coil.
As optimization, by adjust the transmitting coil and the receiving coil turn ratio or the bucking coil it is big
The primary field that small and with receiving coil turn ratio generates transmitting coil passes through the bucking coil and receiving coil combines
Magnetic flux be consistently equal to 0 or close to 0.
As optimization, the transmitting coil and receiving coil turn ratio are 1:10.
The beneficial effects of the present invention are:
Bucking coil in the present invention is contrary with receiving coil coiling, so that the magnetic line of force of the generation of transmitting coil is first
It just cancels out each other when passing through receiving coil again by bucking coil, the magnetic flux of the primary field of receiving coil is always 0, i.e., once
The variation of field will not generate induction field in receiving coil, and since bucking coil is far from receiving coil, the amplitude of secondary field
Substantially it is not influenced by bucking coil, has effectively suppressed the influence of primary field and transmitting module shutdown edge, improved receiving module
Full waveform recording sensitivity.
Detailed description of the invention
Fig. 1 is a kind of connection schematic diagram of transient electromagnetic apparatus of the present invention；
Fig. 2 is a kind of another connection schematic diagram of transient electromagnetic apparatus of the present invention.
Fig. 3 is the distribution schematic diagram of transmitting coil primary field.
In attached drawing, 1 is transmitting coil, and 2 be receiving coil, and 3 be bucking coil, and 4 be transmitter, and 5 be receiver.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing.
Embodiment 1: it as shown in Figure 1, a kind of transient electromagnetic apparatus, including transmitter 4, transmitting coil 1, bucking coil 3, connects
Take-up circle 2 and receiver 5, the central coaxial of 2 three of transmitting coil 1, bucking coil 3 and receiving coil and parallel to each other, transmitting
Coil 1 is identical with the diameter of receiving coil 2；Receiving coil 2 is in the surface of bucking coil 3 and transmitting coil 1.The present embodiment
In, the centre distance of receiving coil 2 and transmitting coil 1 is 0.5-4 times of 1 diameter of transmitting coil.The closest detection of transmitting coil 1
Region, the diameter of bucking coil 3 are less than the diameter of transmitting coil 1 and bucking coil 3 and transmitting coil 1 in same level.
Bucking coil 3 is identical as the wire type of receiving coil 2, and bucking coil 3 is connected with receiving coil 2 and coiling is contrary, makes
The primary field that generates of transmitting coil 1 pass through bucking coil 3 and the combined magnetic flux of receiving coil 2 be consistently equal to 0 or close to
0。
When transmitter 4 accesses electric current to transmitting coil 1, the generation primary field of transmitting coil 1, the one of the generation of transmitting coil 1
When secondary field is across the combination of bucking coil 3 and receiving coil 2, since bucking coil 3 is contrary with 2 coiling of receiving coil, institute
It is first passed through when bucking coil passes through receiving coil again with the magnetic line of force that transmitting coil 1 generates and is just cancelled out each other, the one of receiving coil
The magnetic flux of secondary field is always 0, i.e. the variation of primary field will not generate induction field in receiving coil.
Embodiment 2: it as shown in Fig. 2, a kind of transient electromagnetic apparatus, including transmitter 4, transmitting coil 1, bucking coil 3, connects
Take-up circle 2 and receiver 5, the central coaxial of 2 three of transmitting coil 1, bucking coil 3 and receiving coil and parallel to each other, transmitting
Coil 1 is identical with the diameter of receiving coil 2；Receiving coil 2 is in the surface of bucking coil 3 and transmitting coil 1.The present embodiment
In, the centre distance of receiving coil 2 and transmitting coil 1 is 0.5-4 times of 1 diameter of transmitting coil.The closest detection of transmitting coil 1
The diameter in region, bucking coil 3 is equal with the diameter of transmitting coil 1 and the top of transmitting coil 1 is arranged in and abuts emission lines
Circle 1 but not Chong Die with transmitting coil 1.Bucking coil 3 is identical as the wire type of receiving coil 2, bucking coil 3 and receiving coil
2 series connection and coiling is contrary, so that the primary field that transmitting coil 1 generates passes through bucking coil 3 and the combined magnetic of receiving coil 2
Flux is consistently equal to 0 or close to 0.
When transmitter 4 accesses electric current to transmitting coil 1, the generation primary field of transmitting coil 1, the one of the generation of transmitting coil 1
When secondary field is across the combination of bucking coil 3 and receiving coil 2, since bucking coil 3 is contrary with 2 coiling of receiving coil, institute
It is first passed through when bucking coil passes through receiving coil again with the magnetic line of force that transmitting coil 1 generates and is just cancelled out each other, the one of receiving coil
The magnetic flux of secondary field is always 0, i.e. the variation of primary field will not generate induction field in receiving coil.
In a particular embodiment, a kind of transient electromagnetic apparatus of the invention backoff algorithm the following steps are included:
1, according to detection needs, the size and location of transmitting coil 1, the position of receiving coil 2 and bucking coil 3 are determined,
And 1 primary field of transmitting coil is calculated in the vertical magnetic field that receiving coil 2 generates, further according to vertical according to 1 magnetic moment parameter of transmitting coil
Turn ratio to the size of the turn ratio or bucking coil 3 of flux control transmitting coil 1 and receiving coil 2 and with receiving coil 2,
So that the primary field that transmitting coil generates pass through bucking coil 3 and the combined magnetic flux of receiving coil 2 be consistently equal to 0 or close to
0.In the present embodiment, the turn ratio of bucking coil and receiving coil is 1:10.
2, the transient electromagnetic apparatus in embodiment is hung in the air, receiver 5 is recorded under infinite resistance rate background
Transmitter 4 it is pure shutdown along inductive signal；The signal of 5 normal acquisition of receiver is cut into pure shutdown along inductive signal again, is exactly
Accurate secondary field inductive signal.
As shown in figure 3, the center of transmitting coil, magnetic density are strong；The surface of transmitting coil, magnetic density
It is weak.Therefore in the case where common flux, i.e. zero primary field, the area of receiving coil is much larger than the area of bucking coil, i.e., only
Diameter is needed to be less than the bucking coil of receiving coil.Equal separate receiving coil in the present invention, since bucking coil is separate
Receiving coil, the amplitude of secondary field are not influenced substantially by bucking coil, are effectively suppressing primary field and transmitter shutdown
The full waveform recording dynamic range of receiver is improved under the influence of.
Finally, it should be noted that those skilled in the art various changes and modifications can be made to the invention without departing from
The spirit and scope of the present invention.In this way, if these modifications and changes of the present invention belongs to the claims in the present invention and its waits system
Within the scope of counting, then the present invention is also intended to encompass these modification and variations.
Claims (9)
1. a kind of transient electromagnetic apparatus, which is characterized in that including transmitter, transmitting coil, bucking coil, receiving coil and reception
Machine, the transmitting coil, bucking coil and receiving coil three central coaxial and parallel to each other and described connect the transmitting coil
The diameter of take-up circle is identical；The bucking coil is connected with the receiving coil and coiling is contrary, and the receiving coil exists
The surface of the bucking coil and the transmitting coil；So that the primary field that transmitting coil generates passes through bucking coil and reception
The magnetic flux of coil combination is consistently equal to 0 or close to 0.
2. a kind of transient electromagnetic apparatus according to claim 1, which is characterized in that the transmitting coil, receiving coil and
Bucking coil effectively seal in the number of turns and diameter be adjusting.
3. a kind of transient electromagnetic apparatus according to claim 1, which is characterized in that the receiving coil and transmitting coil
Centre distance is 0.5-4 times of the transmitting coil diameter.
4. a kind of transient electromagnetic apparatus according to claim 1 to 3, which is characterized in that the diameter of the bucking coil
Less than the transmitting coil diameter and the bucking coil and the transmitting coil in same level, the bucking coil
It is identical with the wire type of receiving coil.
5. a kind of transient electromagnetic apparatus according to claim 1 to 3, which is characterized in that the diameter of the bucking coil
Top equal with the diameter of the transmitting coil and that the transmitting coil is set and against the transmitting coil but not with hair
The overlapping of ray circle, the bucking coil are identical with the wire type of receiving coil.
6. a kind of backoff algorithm using a kind of any transient electromagnetic apparatus of claim 1-5, which is characterized in that including
Following steps:
S1, the transmitting coil is placed in above region surface to be measured, the bucking coil coaxial arrangement is in the transmitting coil
Top or same level, receiving coil coaxial arrangement is in the top of the bucking coil；
S2, be passed through electric current into the launching circuit of transmitting coil, adjust the receiving coil the number of turns and/or the bucking coil
The number of turns or diameter so that the primary field that transmitting coil generates passes through magnetic flux that receiving coil and bucking coil combine always etc.
In 0 or close to 0；
S3, a kind of any transient electromagnetic apparatus of claim 1-5 is hung in the air, the receiver records infinity
The pure shutdown of transmitter under resistivity background is along inductive signal；
S4, the signal of receiver normal acquisition is cut to S1 pure shutdown obtained along inductive signal, is exactly accurate secondary field
Inductive signal.
7. a kind of backoff algorithm of transient electromagnetic apparatus according to claim 6, which is characterized in that according to detection needs,
Size, position and receiving coil and the position of bucking coil for determining transmitting coil are calculated according to transmitting coil magnetic moment parameter
Transmitting coil primary field determines the number of turns of transmitting coil and receiving coil in the vertical magnetic field that receiving coil generates.
8. a kind of backoff algorithm of transient electromagnetic apparatus according to claim 6 or 7, which is characterized in that by adjusting institute
It states the turn ratio of transmitting coil and the receiving coil or the size of the bucking coil and makes with the turn ratio of receiving coil
The primary field that transmitting coil generates passes through the magnetic flux that the bucking coil and receiving coil combine and is consistently equal to 0 or close to 0.
9. a kind of backoff algorithm of transient electromagnetic apparatus according to claim 8, which is characterized in that the transmitting coil with
Receiving coil turn ratio is 1:10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811617852.XA CN109471180A (en) | 2018-12-28 | 2018-12-28 | A kind of transient electromagnetic apparatus and backoff algorithm |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811617852.XA CN109471180A (en) | 2018-12-28 | 2018-12-28 | A kind of transient electromagnetic apparatus and backoff algorithm |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946744A (en) * | 2019-04-01 | 2019-06-28 | 吉林大学 | A kind of transient electromagnetic exploration system and method based on controllable source compensation |
| CN110068871A (en) * | 2019-04-29 | 2019-07-30 | 吉林大学 | A kind of miniature measuring system and method for vehicle-mounted time domain electromagnetic induction-polarity effect |
| 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 |
| CN110673220A (en) * | 2019-10-23 | 2020-01-10 | 中国船舶重工集团公司七五0试验场 | Active electromagnetic detection primary field adaptive compensation method |
| CN111290029A (en) * | 2020-03-27 | 2020-06-16 | 吉林大学 | Non-coplanar Bucking compensated dragging type electromagnetic device and manufacturing method thereof |
| CN111538093A (en) * | 2020-06-24 | 2020-08-14 | 吉林大学 | Method for shallow surface detection and transient electromagnetic instrument |
| CN112130214A (en) * | 2020-09-24 | 2020-12-25 | 中国科学院空天信息创新研究院 | Aviation transient electromagnetic eccentric double-compensation coil system |
| CN112448148A (en) * | 2019-09-05 | 2021-03-05 | 北京华航无线电测量研究所 | Magnetic field antenna for low-frequency electromagnetic communication of moving platform and working method |
| CN113534266A (en) * | 2021-07-08 | 2021-10-22 | 吉林大学 | Multi-receiving coil spread spectrum aviation electromagnetic exploration device containing compensation ring Z component |
| CN115857026A (en) * | 2022-12-21 | 2023-03-28 | 中国地质调查局地球物理调查中心 | Detection method |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946744A (en) * | 2019-04-01 | 2019-06-28 | 吉林大学 | A kind of transient electromagnetic exploration system and method based on controllable source compensation |
| CN110068871A (en) * | 2019-04-29 | 2019-07-30 | 吉林大学 | A kind of miniature measuring system and method for vehicle-mounted time domain electromagnetic induction-polarity effect |
| CN110068871B (en) * | 2019-04-29 | 2020-07-17 | 吉林大学 | Vehicle-mounted time domain electromagnetic induction-polarization effect miniature measuring system and method |
| 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 |
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| CN112448148A (en) * | 2019-09-05 | 2021-03-05 | 北京华航无线电测量研究所 | Magnetic field antenna for low-frequency electromagnetic communication of moving platform and working method |
| CN112448148B (en) * | 2019-09-05 | 2023-07-14 | 北京华航无线电测量研究所 | Magnetic field antenna for low-frequency electromagnetic communication of moving platform and working method |
| CN110673220A (en) * | 2019-10-23 | 2020-01-10 | 中国船舶重工集团公司七五0试验场 | Active electromagnetic detection primary field adaptive compensation method |
| CN111290029B (en) * | 2020-03-27 | 2021-11-02 | 吉林大学 | Non-coplanar Bucking compensated dragging type electromagnetic device and manufacturing method thereof |
| CN111290029A (en) * | 2020-03-27 | 2020-06-16 | 吉林大学 | Non-coplanar Bucking compensated dragging type electromagnetic device and manufacturing method thereof |
| CN111538093A (en) * | 2020-06-24 | 2020-08-14 | 吉林大学 | Method for shallow surface detection and transient electromagnetic instrument |
| CN112130214A (en) * | 2020-09-24 | 2020-12-25 | 中国科学院空天信息创新研究院 | Aviation transient electromagnetic eccentric double-compensation coil system |
| CN113534266B (en) * | 2021-07-08 | 2022-05-13 | 吉林大学 | Multi-receiving coil spread spectrum aviation electromagnetic exploration device containing compensation ring Z component |
| CN113534266A (en) * | 2021-07-08 | 2021-10-22 | 吉林大学 | Multi-receiving coil spread spectrum aviation electromagnetic exploration device containing compensation ring Z component |
| CN115857026A (en) * | 2022-12-21 | 2023-03-28 | 中国地质调查局地球物理调查中心 | Detection method |
| CN115857026B (en) * | 2022-12-21 | 2024-03-15 | 中国地质调查局地球物理调查中心 | Detection method |
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