Aeronautical magnetic field compensation multi-coil system based on double compensation coils

Abstract

The invention discloses an aviation magnetic field compensation multi-coil system based on a dual-compensation coil, which comprises a transmitting coil, a receiving coil and a dual-compensation coil,wherein the dual-compensation coil comprises a forward compensation coil and a reverse compensation coil and is arranged between the transmitting coil and the receiving coil; the transmitting coil, the dual-compensation coil and the receiving coil are coplanar and concentrical, and the receiving coil is located at the inner side; and parameter setting of the dual-compensation coil enables primaryfield signals received by the receiving coil to be zero. The radius and the turn number of the dual-compensation coil in the system can be flexibly adjusted and changed according to actual application needs and are not strictly restrained by parameters of the transmitting coil, and the geometric size and the weight of the compensation coil can be effectively reduced; and the dynamic range of a receiver can be effectively reduced, the shallow detection capability and the detection accuracy of an airborne transient electromagnetic system can be improved to a great extent, and the airborne transient electromagnetic detection data quality and the effects, and the system design flexibility and the practicability can be improved.

Description

technical field [0001] The disclosure belongs to the technical field of aeronautical transient electromagnetic detection, and relates to an aeronautical magnetic field compensation multi-coil system based on double compensation coils. Background technique [0002] The airborne transient electromagnetic method based on the aerial transient electromagnetic detection system is a time-domain artificial source electromagnetic detection method based on electromagnetic induction, and it is one of the important means to detect electrically anomalous ore bodies, especially metal ores. This method has the characteristics of low cost and high speed, and can be used for target area selection and resource rapid evaluation in covered areas such as surface vegetation and deserts, and can realize rapid exploration of large-scale mineral resources. A pulsed current is sent underground through a multi-turn coil suspended under the aircraft to generate a pulsed magnetic field, that is, a prima...

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Problems solved by technology

[0003] The aviation transient electromagnetic detection system is limited by the flight platform. Compared with the ground transient electromagnetic system, it generally uses a smaller multi-turn transmitting coil. , there is no compensation coil, the strong primary field signal generated by the direct coupling between the transmitting coil and the receiving coil, the primary field signal is stronger than the secondary field signal, which saturates the early signal of the receiver, resulting in different degrees of saturation distortion of the observation signal, shallow The partial underground information is submerged in the strong primary field signal, thus losing the shallow underground information, further increasing the detection blind zone, which does not meet the requirements of aviation transient electromagnetic detection

Individual airborne electromagnetic systems compensate the primary field signal of the receiving coil by adding a coplanar and common-center reverse magnetic field compensation coil, but the compensation effect is limited, and the design of the compensation coil is too limited by the geometric size of the transmitting coil and magnetic moment requirements, the flexibility and applicability of the compensation coil design are poor

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