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Multi-transmitting-coil transient electromagnetic combination device
Description
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Technical Field
The invention relates to the field of electromagnetic detection, in particular to a transient electromagnetic combination device with multiple transmitting coils.
Background
Transient Electromagnetic Methods (TEM) are a geophysical prospecting method in which a primary pulsed magnetic field is emitted into the ground by using an ungrounded return line or grounded line source, and a secondary eddy current field is observed by using a coil or a grounded electrode during the gap of the primary pulsed magnetic field. The method is mainly applied to the fields of engineering geological exploration, metal mineral exploration, coal mine exploration and the like.
The existing coils mostly adopt overlapping loop coils, mutual inductance is strong, curve attenuation becomes slow, especially attenuation of a late track, distortion is large, and transient electromagnetic rules are not met, so that actual use effect is not consistent with actual geological conditions.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a multi-transmitting-coil transient electromagnetic combination device, which can eliminate the aliasing phenomenon of a primary field and a secondary field of a conventional receiving coil, reduce the influence of mutual inductance and enable transient electromagnetic signals to accord with the actual rule.
The technical scheme for solving the technical problems is as follows: a transient electromagnetic combination device with multiple transmitting coils comprises the transmitting coils, a plurality of receiving coils, a transmitter and a receiver, wherein the transmitting coils are connected with the transmitter, the receiving coils are connected with the receiver, all the transmitting coils are arranged at intervals in an array, one receiving coil is arranged, the receiving coil is arranged above all the transmitting coils, and an overlapping area is formed between each receiving coil and each transmitting coil; in the receiving coil, the total area of the overlapping area of the receiving coil and all the transmitting coils is a first area, the area of the non-overlapping area of the receiving coil and all the transmitting coils is a second area, and when the transmitter supplies power to the transmitting coils, the magnetic flux in the first area and the magnetic flux in the second area are equal in size and opposite in direction.
The invention has the beneficial effects that: the multi-transmitting-coil transient electromagnetic combination device uses a plurality of transmitting coils fixed together in an array interval as a combination, the receiving coil is positioned above the receiving coil, and the magnetic fields generated by the plurality of transmitting coils in the area where the receiving coil is positioned are required to be zero, so that the aliasing phenomenon of the primary field and the secondary field of the conventional receiving coil can be eliminated, the mutual inductance influence is reduced, and the transient electromagnetic signals conform to the actual rule.
On the basis of the technical scheme, the invention can be further improved as follows.
Furthermore, the number of the transmitting coils is two, the two transmitting coils are arranged at intervals from left to right, and the winding directions of the two transmitting coils are opposite; the receiving coil is positioned above the two transmitting coils, and an overlapping area is respectively arranged between the receiving coil and the two transmitting coils.
Further, four transmitting coils are arranged at intervals from top to bottom and from left to right, the winding directions of the two transmitting coils on the left side are the same, the winding directions of the two transmitting coils on the right side are the same, and the winding directions of the two transmitting coils on the left side are opposite to the winding directions of the two transmitting coils on the right side; the receiving coil is positioned above the four transmitting coils, and an overlapping area is respectively arranged between the receiving coil and the four transmitting coils.
Further, all the transmitting coils are located in the same plane or in a plurality of different planes, and when all the transmitting coils are located in the plurality of different planes, the vertical projections of all the transmitting coils are arranged at array intervals.
Further, the directions of the magnetic fields inside all the transmitting coils are the same, the directions of the magnetic fields outside all the transmitting coils are the same, and the directions of the magnetic fields inside all the transmitting coils are opposite to the directions of the magnetic fields outside all the transmitting coils.
Further, the magnetic field directions inside all the transmitting coils are inward, and the magnetic field directions outside all the transmitting coils are outward;
or, the magnetic field directions inside all the transmitting coils are outward, and the magnetic field directions outside all the transmitting coils are inward.
Further, the transmitting coil and the receiving coil are both adjustable-circumference coils.
The beneficial effect of adopting the further scheme is that: the length of the side of the transmitting coil and the length of the side of the receiving coil can be changed into coils with different sizes, so that the method is suitable for exploration requirements of different depths.
Drawings
FIG. 1 is a schematic diagram of a first structure of a transient electromagnetic assembly with multiple transmitting coils according to the present invention;
fig. 2 is a diagram illustrating a second structure of a transient electromagnetic assembly with multiple transmitting coils according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. and a transmitting coil 2 and a receiving coil.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
A transient electromagnetic combination device with multiple transmitting coils comprises a transmitting coil 1, a receiving coil 2, a transmitter and a receiver, wherein the transmitting coil 1 is connected with the transmitter, the receiving coil 2 is connected with the receiver, the transmitting coil 1 is provided with a plurality of transmitting coils, all the transmitting coils 1 are arranged at intervals in an array, one receiving coil 2 is arranged, the receiving coil 2 is arranged above all the transmitting coils 1, and an overlapping area is respectively arranged between each transmitting coil 1 and the receiving coil 2; in the receiving coil 2, the total area of the overlapping region of the receiving coil 2 and all the transmitting coils 1 is a first area, the area of the non-overlapping region of the receiving coil 2 and all the transmitting coils 1 is a second area, and when the transmitter supplies power to the transmitting coil 1, the magnetic flux in the first area and the magnetic flux in the second area are equal in magnitude and opposite in direction.
The first embodiment is as follows: on the basis, as shown in fig. 1, two transmitting coils 1 are provided, the two transmitting coils 1 are arranged at intervals left and right, and the winding directions of the two transmitting coils 1 are opposite; the receiving coil 2 is located above the two transmitting coils 1, and has an overlapping area with the two transmitting coils 1.
Example two: on the basis, as shown in fig. 2, four transmitting coils 1 are provided, the four transmitting coils 1 are arranged at intervals from top to bottom, the winding directions of the two transmitting coils 1 on the left side are the same, the winding directions of the two transmitting coils 1 on the right side are the same, and the winding directions of the two transmitting coils 1 on the left side are opposite to the winding directions of the two transmitting coils 1 on the right side; the receiving coil 2 is located above the four transmitting coils 1, and has an overlapping area with the four transmitting coils 1.
In any embodiment, all the transmitting coils 1 are located in the same plane or in a plurality of different planes, and when all the transmitting coils 1 are located in a plurality of different planes, the vertical projections of all the transmitting coils 1 are arranged at intervals of an array.
In any embodiment, the magnetic field direction inside all the transmitting coils 1 is the same, the magnetic field direction outside all the transmitting coils 1 is the same, and the magnetic field direction inside all the transmitting coils 1 is opposite to the magnetic field direction outside all the transmitting coils 1.
Specifically, the magnetic field directions inside all the transmitting coils 1 are inward, and the magnetic field directions outside all the transmitting coils 1 are outward;
or, the magnetic field directions inside all the transmitting coils 1 are outward, and the magnetic field directions outside all the transmitting coils 1 are inward.
In any embodiment, the transmitting coil 1 and the receiving coil 2 are both adjustable-circumference coils.
In any embodiment, N (N-2 or 4) transmitting coils are provided; the k-th transmitting coil is formed bykThe turn sub-coil is formed by winding, k belongs to [1](ii) a In the receiving coil, the area of the overlapping region of the receiving coil and the kth transmitting coil is Sk 
In the receiving coil, the area of a non-overlapping area of the receiving coil and all the transmitting coils is S; when the transmitter supplies power to all the transmitting coils, the current generated in the k transmitting coil is IkAnd after the sub-coils forming the kth transmitting coil are electrified, a magnetic field is generated, and the magnetic field comprises the following components:
(1)
each turn of the kth transmitting coil has an area SkThe magnetic flux generated in the overlapping region of (a) is:
the kth transmitting coil (with m)kTurn sub-coil) has an area SkThe magnetic flux generated in the overlapping region of (a) is:
φk＝mk*φ；
the total magnetic flux generated by the N transmitting coils in the corresponding overlapping regions (i.e., the total magnetic flux in the first area) is:
wherein: mu.s0＝4π×10-7H/m，lkIs the length of each sub-coil turn in the kth transmitting coil, rkIs the cross-sectional radius of the sub-coil in the kth transmit coil.
(2)
The magnetic flux generated by each turn of the kth transmitting coil in the area where the receiving coil and all the transmitting coils do not overlap is as follows:
the kth transmitting coil (with m)kTurn sub-coils) generates magnetic flux in the region where the receiving coil does not overlap with all the transmitting coils as follows:
φk'＝mk*φ'；
the total magnetic flux generated by the N transmitting coils in the region where the receiving coil does not overlap with all the transmitting coils (i.e. the total magnetic flux in the second area) is:
in order to enable the receiving coil to receive a pure secondary field inside, it is necessary to ensure that the primary field inside the receiving coil is 0, i.e. the total magnetic flux in the receiving coil is:
i.e. the total magnetic flux in the receiving coil is equal to 0 (or approximately equal to 0), i.e. the total magnetic field in the receiving coil is equal to 0.
In order to ensure that the total magnetic flux in the receiving coil is equal to 0, the receiving area occupied by the receiving coil inside all the transmitting coils and the number of coil turns can be set.
In addition, the transient electromagnetic combination device with multiple transmitting coils has the advantages of low voltage and high current: after a plurality of transmitting coils are combined, the resistance can be reduced by being equivalent to a parallel circuit, so that the transmitting current can be increased, signals can be enhanced, and low-voltage large-current transmission can be realized.
The multi-transmitting-coil transient electromagnetic combination device uses a plurality of transmitting coils fixed together in an array interval as a combination, the receiving coil is positioned above the receiving coil, and the magnetic fields generated by the plurality of transmitting coils in the area where the receiving coil is positioned are required to be zero, so that the aliasing phenomenon of the primary field and the secondary field of the conventional receiving coil can be eliminated, the mutual inductance influence is reduced, and the transient electromagnetic signals conform to the actual rule.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
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Claims (7)
Hide Dependent
translated from
1. A multi-transmitting-coil transient electromagnetic assembly comprising a transmitting coil, a receiving coil, a transmitter and a receiver, said transmitting coil being connected to said transmitter and said receiving coil being connected to said receiver, characterized in that: the transmitting coils are arranged in a plurality, all the transmitting coils are arranged at intervals in an array, one receiving coil is arranged, the receiving coil is arranged above all the transmitting coils, and an overlapping area is formed between each receiving coil and each transmitting coil; in the receiving coil, the total area of the overlapping area of the receiving coil and all the transmitting coils is a first area, the area of the non-overlapping area of the receiving coil and all the transmitting coils is a second area, and when the transmitter supplies power to the transmitting coils, the magnetic flux in the first area and the magnetic flux in the second area are equal in size and opposite in direction.
2. The transient electromagnetic combining device of claim 1, wherein: the two transmitting coils are arranged at intervals from left to right, and the winding directions of the two transmitting coils are opposite; the receiving coil is positioned above the two transmitting coils, and an overlapping area is respectively arranged between the receiving coil and the two transmitting coils.
3. The transient electromagnetic combining device of claim 1, wherein: the four transmitting coils are arranged at intervals from top to bottom and from left to right, the winding directions of the two transmitting coils on the left side are the same, the winding directions of the two transmitting coils on the right side are the same, and the winding directions of the two transmitting coils on the left side are opposite to the winding directions of the two transmitting coils on the right side; the receiving coil is positioned above the four transmitting coils, and an overlapping area is respectively arranged between the receiving coil and the four transmitting coils.
4. The multiple transmit coil transient electromagnetic assembly of any of claims 1 to 3, wherein: all the transmitting coils are located in the same plane or in a plurality of different planes, and when all the transmitting coils are located in the plurality of different planes, the vertical projections of all the transmitting coils are arranged at intervals in an array.
5. The multiple transmit coil transient electromagnetic assembly of any of claims 1 to 3, wherein: the magnetic field directions in all the transmitting coils are the same, the magnetic field directions outside all the transmitting coils are the same, and the magnetic field directions in all the transmitting coils are opposite to the magnetic field directions outside all the transmitting coils.
6. The transient electromagnetic combining device of claim 5, wherein: the magnetic field directions inside all the transmitting coils are inward, and the magnetic field directions outside all the transmitting coils are outward;
or, the magnetic field directions inside all the transmitting coils are outward, and the magnetic field directions outside all the transmitting coils are inward.
7. The multiple transmit coil transient electromagnetic assembly of any of claims 1 to 3, wherein: the transmitting coil and the receiving coil are both adjustable-circumference coils.