Transmitting and receiving device of mine-used transient electromagnetic instrument

Abstract

The invention discloses a transmitting and receiving device of a mining transient electromagnetic instrument. The transmitting and receiving device comprises a transmitting coil, a transmitting device, a receiving coil, a receiving device, a first receiving socket, a second receiving socket, an attenuator and a signal channel, wherein the transmitting coil is communicated with the transmitting device, two ends of the receiving coil are provided with receiving coil plugs, the first receiving socket is connected with the signal channel through the attenuator, the second receiving socket is directly connected with the signal channel, and the first receiving socket and the second receiving socket can be both independently connected with the receiving coil plugs in a matching way and can be then connected to the receiving device through the signal channel. According to the transmitting and receiving device disclosed by the invention, the geologic body information in a shallow part and a deep part can be effectively received by preventing the distortion caused by the clipping of an early-stage signal; and under the conditions without changing the wire diameter, the winding number and the like of the receiving coil, the coupling degree between the transmitting coil and the receiving coil can be reduced, the influence on a secondary field induced by the receiving coil due to the switching-off current of the transmitting coil can be lessened, and the transmitting coil needs to reach the requirement that a specified intrinsically-safe circuit is not subjected to spark ignition.

Description

technical field [0001] The invention relates to the related field of mine geophysical prospecting, in particular to a transmitting and receiving device of a mine-used transient electromagnetic instrument. Background technique [0002] The transmitting and receiving device of the mining transient electromagnetic instrument generally includes a transmitting coil, a transmitting device, a receiving coil and a receiving device. The transmitting coil is connected to the transmitting device through the transmitting coil plug, and the receiving coil is connected to the receiving device. The transmitting coil and receiving coil are generally wound by mining communication cables, and the transmitting coil is connected to the transmitting device for transmitting the transient excitation field (primary field); the receiving coil is connected to the receiving device for receiving the eddy current field of the geological body (secondary field), realizing Information detection of geologi...

AI Technical Summary

Problems solved by technology

If the center loop device is used, the side length of the receiving coil will be less than 1 meter, and the effective area of ​​the receiving coil will be reduced, which will seriously affect the amplitude of the received signal

If the number of turns of the receiving coil is increased, the effective receiving area can be effectively increased, but the inductance of the receiving coil will increase, which cannot reach GB3836.4-2010 "Explosive Atmospheres Part 4: Protected by Intrinsically Safe Type "i" Intrinsically safe circuits specified in "Equipment" do not require spark ignition

[0005] In addition, the waveform of the excitation field of the transient electromagnetic instrument is generally a bipolar rectangular pulse. , the transmitting coil will generate an induced electromotive force, which may cause spark ignition in the intrinsically safe spark experiment

It is often unable to meet the requirement of no spark ignition for intrinsically safe circuits specified in GB3836.4-2010 "Explosive Atmospheres Part 4: Equipment Protected by Intrinsically Safe Type "i""

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