A spread-spectrum airborne electromagnetic prospecting device with multi-receiving coils and z-component compensating loops

Abstract

The invention discloses a multi-receive coil spread-spectrum airborne electromagnetic exploration device containing a compensation loop Z component. The exploration device includes a transmitter, a transmitting element, a receiving coil, and a receiver. The transmitting element is controlled by the transmitter, and the receiving coil is Multiple mutually independent receiving coils are connected in parallel to the receiver; the projection of multiple mutually independent receiving coils on the plane where the transmitting coil is located does not exceed the range surrounded by the edge of the transmitting coil, and any two of the multiple mutually independent receiving coils The mutual inductance between them is zero. Since the receiving coils are independent of each other, different equivalent areas (signal-to-noise ratios) and bandwidths can be achieved by adjusting the size and number of turns of the receiving coils, so that one survey is equivalent to multiple surveys with a single receiving coil, and the vertical resolution of the survey can be improved. , greatly reducing manpower and material costs, and improving exploration efficiency.

Description

technical field [0001] The invention belongs to the field of geophysical electromagnetic prospecting, and in particular relates to a multi-receiving coil multi-receiving coil with a compensation loop Z-component spread-frequency aerial electromagnetic prospecting device. Background technique [0002] Electromagnetic method is a commonly used geophysical prospecting method, which is widely used in mineral resource exploration, low-quality structure exploration, hydrological survey and archaeological fields, and can be divided into aviation, ground-air, ground, underground and marine electromagnetic methods. [0003] The electromagnetic method is based on Faraday's law of electromagnetic induction. The specific working process is to pass a changing current in the transmitting coil (magnetic source) or grounding wire (electrical source). This time-varying current produces a changing magnetic field (primary field). When the changing primary field will cause Inductive eddy curre...

AI Technical Summary

Problems solved by technology

One of the characteristics of the air-core coil: when the wire material is determined, as the size increases and the number of turns increases, the equivalent area increases, the signal-to-noise ratio increases, and the -3dB bandwidth decreases. On the contrary, as the size decreases and the number of turns The lower the signal-to-noise ratio, the lower the -3dB bandwidth

[0006] The problem at the present stage is that in order to achieve deep exploration, large-size, multi-turn coils are required to improve the signal-to-noise ratio to identify weak signals, but shallow blind spots will be introduced, and small-size, few-turn coils cannot identify deep layers. Weak signals of information, although multiple explorations can be carried out, will greatly increase the cost of manpower and material resources for exploration, and reduce the efficiency of exploration

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