Zero-flux transient electromagnetic detection device of multi-coil tandem winding structure

Abstract

The utility model relates to a zero-flux transient electromagnetic detection device with a multi-coil tandem winding structure, which comprises a transmitting coil, a transmitter, a receiving coil combination and a receiver, the receiving coil is connected with the receiver, and the transmitting coil is connected with the transmitter; the antenna is characterized in that the transmitting coil and the receiving coil are isolated from each other, and the transmitting coil and the receiving coil are located on the same plane. The transmitting coil or the receiving coil is of a multi-coil series connection winding structure. The beneficial effects are that the interference of the transmitting coil on the receiving coil can be effectively offset on the premise of almost not weakening the transmitting magnetic moment of the transmitting coil and the induction voltage of the receiving coil.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic detection, and specifically, it is a zero-flux transient electromagnetic detection device with a multi-coil series-wound structure. Background Technique

[0002] The basic principle of transient electromagnetic detection is to apply a pulsed current in the transmitting coil to generate a transient electromagnetic field, which in turn induces a secondary induced eddy current field in the geological medium. During the interval between pulses, the receiving coil records the change in the induced voltage to measure the attenuation of the secondary induced eddy current field, thereby obtaining underground geological information.

[0003] In practical applications, there is a strong coupling relationship between the transmitting coil and the receiving coil. A large induced voltage will be generated on the receiving coil, covering the secondary field signal carrying effective geological information. How to cancel the interference of the transmitting coil on the receiving coil and eliminate the interference of the primary field is one of the keys to ensuring the detection effect in the field of transient electromagnetic detection.

[0004] Traditional compensation methods will weaken the magnetic moment emitted by the transmitting coil or the induced voltage of the receiving coil to a large extent. The coaxial decoupling with the application publication numbers CN217158614U and CN216209949U, as well as the methods with the application publication numbers CN112731539 and CN112130214A, cancel the influence of the transmitting coil on the receiving coil by anti-transmitting magnetic flux, and at the same time, the emitted magnetic moment will also be lost; the method with the application publication number CN115343768A cancels the primary field interference by the way of anti-winding double receiving coils, but at the same time, it will also cause the loss of the induced voltage amplitude of the effective secondary field signal. Therefore, there is an urgent need for a transient electromagnetic transmitting and receiving coil combination that can effectively eliminate the interference of the transmitting coil and does not affect the transmitting and receiving efficiency. Content of the Utility Model

[0005] The utility model provides a zero-flux transient electromagnetic detection device with a multi-coil series-wound structure, which can effectively eliminate the interference of the primary field.

[0006] To achieve the above purpose, a zero-flux transient electromagnetic detection device with a multi-coil series-wound structure includes a transmitting coil, a transmitter, a receiving coil and a receiver. The receiving coil is connected to the receiver, and the transmitting coil is connected to the transmitter. The key lies in that the transmitting coil and the receiving coil are isolated from each other and parallel to each other, and the transmitting coil or the receiving coil is a multi-coil series-wound structure. The receiving coil simultaneously obtains the magnetic fields of the transmitting coil passing through in the positive and negative directions.

[0007] The total transmitted magnetic flux in the inner receiving coil and the total transmitted magnetic flux in the outer receiving coil are in opposite directions. By adjusting the number of turns, size and position of the inner receiving coil and the outer receiving coil, the transmitted magnetic flux in the receiving coil combination can be cancelled, thereby eliminating the interference of the primary field.

[0008] The transmitting coil combination includes one small transmitting coil, and the receiving coil is a multi-coil series-wound structure. The multi-coil series-wound structure includes an outer receiving coil and an inner receiving coil that are connected in series and have opposite winding directions. The small transmitting coil is orthogonally projected inside the inner coil, and the inner receiving coil is orthogonally projected inside the outer receiving coil.

[0009] The total transmitted magnetic flux inside the inner receiving coil and the total transmitted magnetic flux inside the outer receiving coil are in opposite directions. By adjusting the number of turns, dimensions, and positions of the inner receiving coil and the outer receiving coil, the transmitted magnetic flux inside the receiving coil combination can be cancelled, thereby eliminating the interference of the primary field.

[0010] The transmitting coil combination includes one small transmitting coil, and the receiving coil is a multi-coil series-wound structure. The multi-coil series-wound structure includes one large receiving coil and n small receiving coils that are connected in series in sequence and have the same winding direction. The n small receiving coils and the small transmitting coil do not overlap with each other and their orthogonal projections are all located inside the large receiving coil.

[0011] The large receiving coil contains both the magnetic field outside and inside the small transmitting coil, and all the other small receiving coils only contain the magnetic field outside the small transmitting coil. By adjusting the positions and number of turns of the small receiving coils, the sum of the magnetic fluxes inside all the receiving coils can be made zero, thereby eliminating the interference of the primary field; at the same time, since all the receiving coils have the same winding direction, the signal response of the receiving coil combination will not be weakened.

[0012] The transmitting coil combination is a multi-coil series-wound structure. The multi-coil series-wound structure includes one inner transmitting coil and m outer transmitting coils that are connected in series in sequence and have the same winding direction. The receiving coil is one large receiving coil. The inner transmitting coil is orthogonally projected inside the large receiving coil, and the outer transmitting coils are orthogonally projected outside the large receiving coil.

[0013] The large receiving coil contains both the magnetic field outside and inside the inner transmitting coil, and the large receiving coil contains the magnetic field outside the outer transmitting coils. By adjusting the dimensions, positions, and number of turns of the inner transmitting coil and the outer transmitting coils, the sum of the magnetic fluxes inside the receiving coil can be made zero, thereby eliminating the interference of the primary field; at the same time, since all the transmitting coils have the same winding direction, the transmitting magnetic moment will not be weakened.

[0014] Furthermore, the transmitting coil combination and the receiving coil combination are located in the same plane.

[0015] When the transmitting coil and the receiving coil are located in the same plane, the transmission and reception efficiency is higher than when they form a certain angle with each other.

[0016] The multi-coil series-wound structure is a centrosymmetric structure.

[0017] When the transmitting coil is a multi - coil series - wound structure, the center point of the receiving coil coincides with the center point of the multi - coil series - wound structure;

[0018] When the receiving coil is a multi - coil series - wound structure, the center point of the transmitting coil coincides with the center point of the multi - coil series - wound structure.

[0019] The coincidence of the center positions and the symmetric structure facilitate the winding and fixing of the transmitting coil combination and the receiving coil combination, and also facilitate the stability of the structure.

[0020] The coil shape in the multi - coil series - wound structure is either circular, rectangular, or triangular.

[0021] The shape of the coil only needs to be annular, and it does not need to be strictly specified as circular, rectangular, and triangular.

[0022] The benefits of the present utility model: It can effectively cancel the interference of the transmitting coil to the receiving coil on the premise of hardly weakening the magnetic moment emitted by the transmitting coil and the induced voltage of the receiving coil, and then eliminate the interference of the primary field, ensuring the detection effect of transient electromagnetic detection. Brief Description of the Drawings

[0023] Figure 1 Structural diagram between the transmitting coil and the receiving coil in Embodiment 1;

[0024] Figure 2 Structural diagram between the transmitting coil and the receiving coil in Embodiment 2;

[0025] Figure 3 Structural diagram between the transmitting coil and the receiving coil in Embodiment 3. Detailed Description of the Preferred Embodiments

[0026] The following further elaborates on the present utility model in conjunction with the drawings and embodiments:

[0027] Embodiment 1

[0028] As Figure 1 shown, a zero - flux transient electromagnetic detection device with a multi - coil series - wound structure includes a transmitting coil, a transmitter, a receiving coil, and a receiver. The receiving coil is connected to the receiver, and the transmitting coil is connected to the transmitter. The transmitting coil and the receiving coil are isolated from each other, and the transmitting coil and the receiving coil are located in the same plane.

[0029] The transmitting coil combination includes 1 small transmitting coil. The receiving coil is a multi - coil series - wound structure, which includes an outer receiving coil and an inner receiving coil that are connected in series and have opposite winding directions. The small transmitting coil is orthogonally projected inside the inner coil, and the inner receiving coil is orthogonally projected inside the outer receiving coil. The receiving coil simultaneously acquires the magnetic field of the transmitting coil passing through in the positive and negative directions.

[0030] The multi-coil series-wound structure is a centrally symmetric structure, and the center point of the transmitting coil coincides with the center point of the multi-coil series-wound structure.

[0031] The shape of the coil in the multi-coil series-wound structure is either circular, rectangular, or triangular.

[0032] The total transmitted magnetic flux in the inner receiving coil and the total transmitted magnetic flux in the outer receiving coil are in opposite directions. By adjusting the number of turns, size, and position of the inner receiving coil and the outer receiving coil, the transmitted magnetic flux within the receiving coil combination can be cancelled out, thereby eliminating the interference of the primary field.

[0033] Example 2, which has the same structure as Example 1.

[0034] The differences are as Figure 2 shown:

[0035] The transmitting coil combination includes 1 small transmitting coil, and the receiving coil is a multi-coil series-wound structure, which includes 1 large receiving coil and n small receiving coils that are connected in series in sequence and have the same winding direction. The n small receiving coils and the small transmitting coil do not overlap with each other, and their orthographic projections are all located within the large receiving coil.

[0036] The large receiving coil contains both the external magnetic field and the internal magnetic field outside the small transmitting coil. All the remaining small receiving coils only contain the external magnetic field outside the small transmitting coil. By adjusting the position and number of turns of the small receiving coils, the sum of the magnetic fluxes in all the receiving coils can be made zero, thereby eliminating the interference of the primary field; at the same time, since all the receiving coils have the same winding direction, the signal response of the receiving coil combination will not be weakened.

[0037] Example 3, which has the same structure as Example 1.

[0038] The differences are as Figure 3 shown:

[0039] The transmitting coil combination is a multi-coil series-wound structure, which includes 1 inner transmitting coil and m outer transmitting coils that are connected in series in sequence and have the same winding direction. The receiving coil is a large receiving coil. The orthographic projection of the inner transmitting coil is located within the large receiving coil, and the orthographic projection of the outer transmitting coil is located outside the large receiving coil.

[0040] The center point of the receiving coil coincides with the center point of the multi-coil series-wound structure.

[0041] The large receiving coil contains the external magnetic field and the internal magnetic field of the internal transmitting coil outside the internal transmitting coil. The large receiving coil contains the external magnetic field of the external transmitting coil. By adjusting the positions and the number of turns of the internal transmitting coil and the external transmitting coil, it is possible to achieve that the total magnetic flux in the receiving coil is zero, thereby eliminating the interference of the primary field. At the same time, since all the transmitting coils are wound in the same direction, the transmitting magnetic moment will not be weakened.

[0042] The main principle of the present utility model is that the sum of the magnetic fluxes generated by the transmitting coil in all the receiving coils is zero, thereby eliminating the interference of the primary field.

[0043] Finally, it should be noted that the above description is only the preferred embodiment of the present utility model. Those of ordinary skill in the art, under the inspiration of the present utility model and without departing from the purpose and claims of the present utility model, can make various similar representations, and such transformations all fall within the protection scope of the present utility model.

Claims

1. A zero-flux transient electromagnetic detection device with a multi-coil series-wound structure, comprising a transmitting coil, a transmitter, a receiving coil and a receiver, the receiving coil is connected to the receiver, and the transmitting coil is connected to the transmitter, characterized in that: The transmitting coil and the receiving coil are isolated from each other and parallel to each other, and are a multi-coil series-wound structure. The receiving coil simultaneously obtains the magnetic fields of the transmitting coil passing through in the positive and negative directions.

2. The zero-flux transient electromagnetic detection device with a multi-coil series-wound structure according to claim 1, characterized in that: The transmitting coil combination includes 1 small transmitting coil. The receiving coil is a multi-coil series-wound structure, and this multi-coil series-wound structure includes an outer receiving coil and an inner receiving coil that are connected in series with each other and have opposite winding directions. The small transmitting coil is orthogonally projected inside the inner coil, and the inner receiving coil is orthogonally projected inside the outer receiving coil.

3. The zero-flux transient electromagnetic detection device with a multi-coil series-wound structure according to claim 1, characterized in that: The transmitting coil combination includes 1 small transmitting coil. The receiving coil is a multi-coil series-wound structure, and this multi-coil series-wound structure includes 1 large receiving coil and n small receiving coils that are connected in series in sequence and have the same winding direction. The n small receiving coils and the small transmitting coil do not overlap with each other and their orthogonal projections are all located inside the large receiving coil.

4. A zero-flux transient electromagnetic detection device with a multi-coil series-wound structure according to claim 1, characterized in that: The transmitting coil combination is a multi-coil series-wound structure, and this multi-coil series-wound structure includes 1 inner transmitting coil and m outer transmitting coils that are connected in series in sequence and have the same winding direction. The receiving coil is a large receiving coil. The inner transmitting coil is orthogonally projected inside the large receiving coil, and the outer transmitting coils are orthogonally projected outside the large receiving coil.

5. A zero-flux transient electromagnetic detection device with a multi-coil series-wound structure according to claim 1, characterized in that: The transmitting coil and the receiving coil are located in the same plane.

6. The zero-flux transient electromagnetic detection device with a multi-coil series-wound structure according to claim 1, characterized in that: The multi-coil series-wound structure is a centrosymmetric structure.

7. A zero-flux transient electromagnetic detection device with a multi-coil series connection winding structure according to claim 6, characterized in that: When the transmitting coil is a multi-coil series-wound structure, the center point of the receiving coil coincides with the center point of this multi-coil series-wound structure; When the receiving coil is a multi-coil series-wound structure, the center point of the transmitting coil coincides with the center point of this multi-coil series-wound structure.

8. A zero-flux transient electromagnetic detection device with a multi-coil series-wound structure according to claim 1, characterized in that: The shape of the coil in the multi-coil series-wound structure is either circular, rectangular, or triangular.

Images