Mining intrinsic safety type transient electromagnetic instrument receiving antenna

Abstract

The invention belongs to the technical field of geophysical exploration and relates to a mining intrinsic safety type transient electromagnetic instrument receiving antenna. The receiving antenna has certain interference resistance, can meet the requirements of coal mine safety production, brings convenience to measurement and is convenient to carry and high in detection accuracy. The technical scheme is that the receiving antenna comprises a casing, a coil framework is arranged in the casing, an induction coil is wound on the coil framework, a shielding layer is arranged on the induction coil, a horizontal bubble instrument is arranged on the outer surface of the casing, a signal amplifying circuit, a battery pack and a power supply circuit are arranged at the bottom of the casing, the battery pack is connected with the power supply circuit, a magnetic rod is positioned in the coil framework, the signal amplifying circuit comprises a signal input module, the signal input module is sequentially connected with a time-sharing control module, the signal amplifying circuit, an analog switch and a signal output module, and the signal amplifying circuit comprises a small signal amplifying circuit and a large signal amplifying circuit.

Description

1. Technical field: [0001] The invention belongs to the technical field of geophysical prospecting, and relates to a mine-used intrinsically safe transient electromagnetic receiving antenna. 2. Background technology: [0002] Mine transient electromagnetic method, referred to as mine TEM, is an electromagnetic exploration method that has been widely used in the fields of coal mine advanced exploration, roof and floor water damage detection, side walls and internal water damage detection of working faces in recent years. In the field of downhole transient electromagnetic detection technology, instruments at home and abroad generally use multi-turn coils with a diameter greater than 1 meter as receiving antennas. This kind of receiving antenna receives strong signals, but is easily interfered by the outside world. The magnetic field signal and the receiving antenna with high sensitivity, certain anti-interference ability and meeting the coal mine safety requirements are of gre...

AI Technical Summary

Problems solved by technology

In the field of downhole transient electromagnetic detection technology, instruments at home and abroad generally use multi-turn coils with a diameter greater than 1 meter as receiving antennas. This kind of receiving antenna receives strong signals, but is easily interfered by the outside world. The magnetic field signal and the receiving antenna with high sensitivity, certain anti-interference ability and meeting the coal mine safety requirements are of great significance for improving the detection accuracy of the underground transient electromagnetic method.

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