CN212647014U - Double-emitting-coil transient electromagnetic combination device - Google Patents
Double-emitting-coil transient electromagnetic combination device Download PDFInfo
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- CN212647014U CN212647014U CN202021668588.5U CN202021668588U CN212647014U CN 212647014 U CN212647014 U CN 212647014U CN 202021668588 U CN202021668588 U CN 202021668588U CN 212647014 U CN212647014 U CN 212647014U
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Abstract
The utility model relates to a double-emitting-coil transient electromagnetic combination device, which comprises a positive emitting coil, a negative emitting coil, a receiving coil, a transmitter and a receiver; the positive transmitting coil and the negative transmitting coil are electrically connected with the transmitter, and the receiving coil is electrically connected with the receiver; the receiving coil is positioned in the positive transmitting coil, and the reverse transmitting coil is positioned in the receiving coil; when the transmitter supplies power to the positive transmitting coil and the negative transmitting coil, the directions of currents in the positive transmitting coil and the negative transmitting coil are opposite, and magnetic flux generated by the positive transmitting coil in the receiving coil is equal to the magnetic flux generated by the negative transmitting coil in the receiving coil in magnitude and opposite to each other. The utility model discloses in, the total magnetic flux that just transmitting coil and anti-transmitting coil produced in receiving coil is zero, can eliminate the aliasing phenomenon of conventional receiving coil primary field and secondary field, reduces mutual inductive influence for the transient electromagnetic signal who observes accords with actual law.
Description
Technical Field
The utility model relates to a transition electromagnetic equipment, concretely relates to two sending out coil transition electromagnetism composite set.
Background
Transient Electromagnetic Methods (TEM), also known as time domain Electromagnetic Methods, are commonly used physical exploration Methods, and the working principle of the method is to introduce varying currents into a ground lead or an ungrounded return line, transmit a primary field to a detection area, and generate an induced current in a target geologic body under the action of the primary field, and then generate a secondary field. In actual practice, the secondary field is often observed at the primary field gap time. The method is mainly applied to the fields of engineering geological exploration, metal mine exploration, coal mine exploration and the like. The existing coils mostly adopt overlapping loop coils, mutual inductance is strong, especially in the early stage, induced electromotive force and secondary field electromotive force are overlapped, and a measurement curve does not accord with the electromagnetic law of a secondary field, so that the actual use effect does not accord with the actual geological condition.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a two transmission coil transient electromagnetism composite set is provided, can eliminate conventional receiving coil primary field and secondary field aliasing phenomenon, reduce mutual inductance influence for the transient electromagnetic signal who observes accords with actual electromagnetism law.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a double-emitting-coil transient electromagnetic combination device comprises a positive emitting coil, a negative emitting coil, a receiving coil, a transmitter and a receiver; the positive transmitting coil and the negative transmitting coil are electrically connected with the transmitter, and the receiving coil is electrically connected with the receiver; the receiving coil is positioned in the positive transmitting coil, and the reverse transmitting coil is positioned in the receiving coil; when the transmitter supplies power to the positive transmitting coil and the reverse transmitting coil, the directions of currents in the positive transmitting coil and the reverse transmitting coil are opposite, and the magnetic flux generated by the positive transmitting coil in the receiving coil is equal to the magnetic flux generated by the reverse transmitting coil in the receiving coil in magnitude and opposite to each other.
The utility model has the advantages that: in the utility model, the total magnetic flux generated by the positive transmitting coil and the negative transmitting coil in the receiving coil is zero, which can eliminate the aliasing phenomenon of the primary field and the secondary field of the conventional receiving coil and reduce the mutual inductance influence, so that the observed transient electromagnetic signal conforms to the actual rule; in addition, the receiving coil is arranged between the positive transmitting coil and the reverse transmitting coil, compared with a device in which the receiving coil is arranged at the innermost circle, the area of the receiving coil can be effectively increased, the intensity of induced voltage is improved, when the reverse transmitting coil is arranged at the innermost circle, the area is smaller, a reverse primary field generated in a detection area is also smaller, and therefore the total primary field intensity of the detection area is improved, and compared with other detection devices using a compensation coil, the device has a higher signal-to-noise ratio.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the forward transmitting coil, the reverse transmitting coil and the receiving coil are coplanar, and the forward transmitting coil surrounds the receiving coil, and the receiving coil surrounds the reverse transmitting coil.
The beneficial effect of adopting the further scheme is that: just transmitting coil, anti-transmitting coil and receiving coil coplane set up, and space utilization is higher, and the volume is littleer more light, is fit for using in narrow and small spaces such as mine tunnel.
Further, the forward transmitting coil, the backward transmitting coil and the receiving coil are not coplanar, and the projections of the forward transmitting coil, the backward transmitting coil and the receiving coil in the vertical direction still surround each other, and the projection of the forward transmitting coil surrounds the projection of the receiving coil, and the projection of the receiving coil surrounds the projection of the backward transmitting coil.
Further, the forward transmitting coil, the backward transmitting coil and the receiving coil are all coils with adjustable circumferences.
Further, the forward transmitting coil, the reverse transmitting coil and the receiving coil are coils with adjustable turns.
Further, the forward transmitting coil, the reverse transmitting coil and the receiving coil are closed coils with the same or different shapes.
The beneficial effect of adopting the further scheme is that: the circumferences, the shapes and the turns of the positive transmitting coil, the negative transmitting coil and the receiving coil are adjustable, and the exploration requirements of different depths can be met.
Further, the axes of the forward transmitting coil, the backward transmitting coil and the receiving coil are the same.
Further, the axes of the forward transmitting coil, the backward transmitting coil and the receiving coil are different.
The beneficial effect of adopting the further scheme is that: the utility model discloses in, just transmitting coil, anti-transmitting coil and receiving coil only need enclose each other, need not an axle center of sharing, can freely lay, only guarantee the electric current opposite direction in just transmitting coil and the anti-transmitting coil, and total magnetic flux in the receiving coil is zero or is near zero, can satisfy the needs of actual work.
Drawings
Fig. 1 is a schematic view of a first structure of a dual-emitting-coil transient electromagnetic combination device according to the present invention;
fig. 2 is a schematic view of a second structure of a dual-emitting-coil transient electromagnetic combination device according to the present invention;
fig. 3 is a schematic view of a third structure of a dual-emitting-coil transient electromagnetic combination device of the present invention;
fig. 4 is a schematic diagram of a fourth structure of a dual-emitting-coil transient electromagnetic combination device of the present invention;
fig. 5 is a schematic view of a fifth structure of a dual-emitting-coil transient electromagnetic assembly of the present invention;
fig. 6 is a schematic view of a sixth structure of a dual-emitting-coil transient electromagnetic combination device according to the present invention;
FIG. 7 is a graph of measured data before and after compensation.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a reverse transmitting coil, 2, a receiving coil, 3 and a positive transmitting coil.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1 to 6, a double-emitting-coil transient electromagnetic combination device comprises a positive emitting coil 3, a negative emitting coil 1, a receiving coil 2, a transmitter and a receiver; the positive transmitting coil 3 and the negative transmitting coil 1 are both electrically connected with the transmitter, and the receiving coil 2 is electrically connected with the receiver; the receiving coil 2 is positioned in the positive transmitting coil 3, and the reverse transmitting coil 1 is positioned in the receiving coil 2; when the transmitter supplies power to the forward transmitting coil 3 and the reverse transmitting coil 1, the directions of currents in the forward transmitting coil 3 and the reverse transmitting coil 1 are opposite, and the magnetic flux generated by the forward transmitting coil 3 in the receiving coil 2 is equal to and opposite to the magnetic flux generated by the reverse transmitting coil 1 in the receiving coil 2.
In this particular embodiment:
preferably, the forward transmitting coil 3, the reverse transmitting coil 1 and the receiving coil 2 are coplanar, and the forward transmitting coil 3 surrounds the receiving coil 2 and the receiving coil 2 surrounds the reverse transmitting coil 1. Just transmitting coil 3, anti-transmitting coil 1 and receiving coil 2 coplane set up, and space utilization is higher, and the volume is littleer more light, is fit for using in narrow and small spaces such as mine tunnel.
Preferably, the forward transmitting coil 3, the backward transmitting coil 1 and the receiving coil 2 are not coplanar, and the projections of the forward transmitting coil 3, the backward transmitting coil 1 and the receiving coil 2 in the vertical direction still surround each other, and the projection of the forward transmitting coil 3 surrounds the projection of the receiving coil 2, and the projection of the receiving coil 2 surrounds the projection of the backward transmitting coil 1.
Preferably, the positive transmitting coil 3, the negative transmitting coil 1 and the receiving coil 2 are all adjustable-circumference coils.
Preferably, the forward transmitting coil 3, the reverse transmitting coil 1 and the receiving coil 2 are coils with adjustable turns.
Preferably, the forward transmitting coil 3, the reverse transmitting coil 1 and the receiving coil 2 are closed coils with the same or different shapes. In fig. 1, the forward transmitting coil 3, the reverse transmitting coil 1 and the receiving coil 2 are all circular; in fig. 2, the forward transmitting coil 3, the reverse transmitting coil 1 and the receiving coil 2 are all square; in fig. 3, the forward transmitting coil 3, the reverse transmitting coil 1 and the receiving coil 2 are all regular hexagons; in fig. 4, the forward transmitter coil 3 and the receiver coil 2 are square, and the reverse transmitter coil 1 is circular; in fig. 5, the forward transmitting coil 3 is square, and the receiving coil 2 and the reverse transmitting coil 1 are circular; in fig. 6, the forward transmitting coil 3 and the reverse transmitting coil 1 are square, and the receiving coil 2 is circular; in addition, the shapes of the forward transmission coil 3, the reverse transmission coil 1, and the reception coil 2 may be different from each other. The circumferences of the positive transmitting coil 3, the negative transmitting coil 1 and the receiving coil 2 are adjustable, the shapes and the turns of the positive transmitting coil, the negative transmitting coil and the receiving coil are adjustable, and the exploration requirements of different depths can be met.
Preferably, the axes of the forward transmission coil 3, the reverse transmission coil 1 and the receiving coil 2 are the same.
Preferably, the axes of the forward transmitting coil 3, the backward transmitting coil 1 and the receiving coil 2 are different. The utility model discloses in, positive transmitting coil 3, anti-transmitting coil 1 and receiving coil 2 only need enclose each other, need not an axle center of sharing, can freely lay, only guarantee the electric current opposite direction in positive transmitting coil 3 and the anti-transmitting coil 1, and total magnetic flux in the receiving coil 2 is zero or be approximately zero, can satisfy the needs of actual work.
In the embodiment, the positive transmitting coil 3 is composed of n3Formed by winding a coil of turns having an area S3A circumference of C3The current is I3(ii) a The counter-emitting coil 1 is composed of n1Formed by winding a coil of turns having an area S1A circumference of C1The current is I1(ii) a The receiving coil 2 is composed of n2Formed by winding a coil of turns having an area S2。
And (3) deducing the magnetic induction intensity of any point in the receiving coil according to the Biot-Savart law:
wherein, mu0Is the vacuum permeability, dk is the line element vector on the transmitting coil; l is the vector distance between the integration point in the plane of the receiving coil and the vector dk of the line element of the transmitting coil, and n is the number of turns of the transmitting coil.
The magnetic flux generated by the positive transmitting coil 3 in the receiving coil 2 is:
the magnetic flux generated by the counter-transmitting coil 1 in the receiving coil 2 is:
the primary field induced voltage generated by the receiving coil 2 is:
in order to make the primary field induced voltage of the receiving coil 2 about 0, it is necessary to ensure that the rate of change of the primary field inside the receiving coil 2 is 0 or about 0, i.e. there are:
the total magnetic flux in the receiving coil 2 is then equal to 0 (or approximately equal to 0), that is to say the total magnetic field in the receiving coil 2 is approximately equal to 0. Therefore, the device can adjust the current passing through the forward transmitting coil 3 and the reverse transmitting coil 1, the number of turns and the perimeter, and the area of the receiving coil 2 to achieve the purpose that the total magnetic field is equal to 0 or approximately equal to 0.
Fig. 7 is measured data curve graph around the compensation, and in fig. 7, a branch of curve that is located the upper right is measured data before the compensation, and a branch of curve that is located the lower left is measured data after the compensation, and the contrast can know from this, the utility model provides a two transmission lines circle transient electromagnetism composite set can eliminate the aliasing of conventional receiving coil primary field and secondary field, reduces mutual inductance influence for the transient electromagnetic signal who observes accords with actual electromagnetism law.
The utility model can realize the offset of the magnetic flux of the primary field on the receiving coil 2 and eliminate the aliasing phenomenon of the primary field and the secondary field of the conventional receiving coil by adjusting the areas, the number of turns and the current of the receiving coil 2, the forward transmitting coil 3 and the backward transmitting coil 1; because the aliasing phenomenon of the primary field and the secondary field of the conventional receiving coil is eliminated, the dynamic range of the received signal is reduced, and the problem of difficulty in receiving weak secondary signals is solved; meanwhile, the whole working device is smaller and more compact and is convenient to use; need not to adjust after using the fixed bolster, measuring effect is accurate reliable.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (8)
1. The utility model provides a two sending out radial coil transient electromagnetism composite set which characterized in that: the device comprises a positive transmitting coil, a negative transmitting coil, a receiving coil, a transmitter and a receiver; the positive transmitting coil and the negative transmitting coil are electrically connected with the transmitter, and the receiving coil is electrically connected with the receiver; the receiving coil is positioned in the positive transmitting coil, and the reverse transmitting coil is positioned in the receiving coil; when the transmitter supplies power to the positive transmitting coil and the reverse transmitting coil, the directions of currents in the positive transmitting coil and the reverse transmitting coil are opposite, and the magnetic flux generated by the positive transmitting coil in the receiving coil is equal to the magnetic flux generated by the reverse transmitting coil in the receiving coil in magnitude and opposite to each other.
2. The dual-emitting-coil transient electromagnetic assembly of claim 1, wherein: the positive transmitting coil, the reverse transmitting coil and the receiving coil are coplanar, the positive transmitting coil surrounds the receiving coil, and the receiving coil surrounds the reverse transmitting coil.
3. The dual-emitting-coil transient electromagnetic assembly of claim 1, wherein: the forward transmitting coil, the backward transmitting coil and the receiving coil are not coplanar, projections of the forward transmitting coil, the backward transmitting coil and the receiving coil in the vertical direction still surround each other, the projection of the forward transmitting coil surrounds the projection of the receiving coil, and the projection of the receiving coil surrounds the projection of the backward transmitting coil.
4. A dual-emitter coil transient electromagnetic assembly as claimed in any one of claims 1 to 3, wherein: the positive transmitting coil, the negative transmitting coil and the receiving coil are all adjustable-circumference coils.
5. A dual-emitter coil transient electromagnetic assembly as claimed in any one of claims 1 to 3, wherein: the positive transmitting coil, the negative transmitting coil and the receiving coil are coils with adjustable turns.
6. A dual-emitter coil transient electromagnetic assembly as claimed in any one of claims 1 to 3, wherein: the positive transmitting coil, the negative transmitting coil and the receiving coil are closed coils with the same or different shapes.
7. A dual-emitter coil transient electromagnetic assembly as claimed in any one of claims 1 to 3, wherein: the axes of the forward transmitting coil, the backward transmitting coil and the receiving coil are the same.
8. A dual-emitter coil transient electromagnetic assembly as claimed in any one of claims 1 to 3, wherein: the axes of the forward transmitting coil, the backward transmitting coil and the receiving coil are different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021668588.5U CN212647014U (en) | 2020-08-12 | 2020-08-12 | Double-emitting-coil transient electromagnetic combination device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021668588.5U CN212647014U (en) | 2020-08-12 | 2020-08-12 | Double-emitting-coil transient electromagnetic combination device |
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| Publication Number | Publication Date |
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| CN212647014U true CN212647014U (en) | 2021-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021668588.5U Active CN212647014U (en) | 2020-08-12 | 2020-08-12 | Double-emitting-coil transient electromagnetic combination device |
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| CN (1) | CN212647014U (en) |
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- 2020-08-12 CN CN202021668588.5U patent/CN212647014U/en active Active
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