Roadway-hole transient electromagnetic device and measuring method

Abstract

The invention relates to a roadway-hole transient electromagnetic device and a measuring method. The roadway-hole transient electromagnetic device comprises a transmitting device and a receiving device, wherein the transmitting device and the receiving device are connected with a host, a drilled hole and a roadway serve as a whole, when measurement is carried out, the transmitting device and the receiving device are arranged in the roadway and the drilled hole respectively, the host controls the transmitting device and the receiving device to be in time synchronization, and measurement is carried out on an abnormal body through a transient electromagnetic method. When measurement is carried out through the roadway-hole transient electromagnetic device, the roadway-hole transient electromagnetic device is closer to the abnormal body, influence caused by an artificial conductor on the roadway-hole transient electromagnetic device is low, and the signal to noise ratio is high; due to the fact that a transmitting coil is arranged in the roadway, compared with the narrow space of the drilled hole, the parameters such as the number of turns of the transmitting coil and the side length of the transmitting coil can be increased, the transmission magnetic moment can be increased, and the coefficient of mutual induction is almost zero; influence of the volume effect of roadway transient electromagnetic non-contact detection is effectively reduced; due to the fact that the design that a receiving coil with a plurality of components is adopted, the combination forms of the receiving coil can be multiple, and when the PCB receiving coil form is adopted, the effective receiving area can be effectively increased, the radius of detection can be increased, information of geologic bodies, within a certain range, around the drilled hole can be effectively obtained, and precision of judgment of the abnormal body is improved.

Description

technical field [0001] The invention relates to the field of geophysical exploration devices and measurement methods, in particular to a tunnel transient electromagnetic device and measurement method. [0002] Background technique [0003] Transient electromagnetic method (TEM) is an important method that has developed rapidly in the field of exploration in recent years. Compared with other geophysical methods, it has the advantages of large detection depth, high resolution, and rich information. Mining, petroleum, water conservancy and other fields. Mine TEM works in various ways, such as overlapping loop devices, central loop devices, and in-hole transmitting and receiving devices. They all have their own advantages and disadvantages. The shortcomings are mainly reflected in the following aspects: overlapping or center loop devices The resolution is relatively low, and exposed in the mine, it is interfered by the human environment such as various mining equipment and ...

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Problems solved by technology

Mine TEM works in a variety of ways, such as overlapping loop devices, center loop devices, and in-hole transmitting and receiving devices. They all have their own advantages and disadvantages. The shortcomings are mainly reflected in the following aspects: overlapping or center loop devices The resolution is relatively low, and exposed in the mine, it is interfered by the human environment such as various mining equipment and ventilation equipment in the mine, which seriously affects the detection accuracy and accuracy of the instrument; because the drilling transient device is emitted in the hole, Its disadvantage is that the emission magnetic moment is generally small, and the exploration depth is small

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