Transient electromagnetic exploration device and system with shielding function

Abstract

The invention discloses a transient electromagnetic exploration device and system with a shielding function. The device comprises a shielding layer (1), one surface of the shielding layer (1) is a shielding surface, the other surface of the shielding layer (1) is an exploration surface, and the exploration surface side of the shielding layer (1) is provided with a transmitting coil (2) and n receiving coils (3). The direction of magnetic force lines generated by the transmitting coil (2) is perpendicular to the shielding layer (1), and the direction of the magnetic force lines in the transmitting coil (2) is far away from the exploration surface of the shielding layer (1). The structural arrangement is simple, the design is ingenious, a shielding layer is formed, and radiation and interference to human bodies and instruments on the shielding surface side are effectively reduced; and the unexpected eddy current response on the shielding surface side is weakened along with a primary field, so that the influence on acquisition of effective detection signals on the exploration side is reduced.

Description

technical field [0001] The invention relates to the technical field of electromagnetic prospecting, in particular to a transient electromagnetic prospecting device and system with a shielding function. Background technique [0002] Transient electromagnetic surveys are extremely sensitive to low-resistance bodies. Traditional devices are easily disturbed by metal fences and buildings containing metal components in urban spaces, and affected by geological bodies behind in complex environments such as tunnels, coal mines, and boreholes. The existing coil device lacks the ability to bind the primary field excited by it, and has no shielding ability to the undesired secondary field, which greatly affects the imaging accuracy of the exploration. [0003] For example, in the published patent documents: "Mining Transient Electromagnetic Apparatus Accurate Positioning Shielding Receiving Antenna. CN204679653U", "A Sensor Device for Transient Electromagnetic Exploration. CN110398780...

AI Technical Summary

Problems solved by technology

The existing coil device lacks the ability to bind the primary field excited by it, and has no shielding ability to the undesired secondary field, which greatly affects the imaging accuracy of the exploration

[0003] For example, in the published patent documents: "Mining Transient Electromagnetic Apparatus Accurate Positioning Shielding Receiving Antenna. CN204679653U", "A Sensor Device for Transient Electromagnetic Exploration. CN110398780A" introduces a transient electromagnetic receiving antenna with a shielding layer ( sensor), but the radiation interference is large. During the exploration process, it is affected by the undesired eddy current response and the primary field, which has a great impact on the effective detection signal on the exploration side

[0004] In the published patent document: "CN 204632921 A Transient Electromagnetic Transmitting Antenna" introduces a transmitting coil device equipped with profiles made of high magnetic permeability medium, but it only includes transmitting coils, not including receiving coils

During the exploration process, although the directional emission capability can be realized, the aliasing of the undesired eddy current behind the exploration side and the effective detection signal of the exploration side cannot be avoided, which makes the acquisition ability of the exploration receiving coil poor

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