Abstract: The present disclosure discloses a mine transient electromagnetic (TEM) three-component detection method. TEM transmitting coils and receiving coils are adjusted according to geological features in a coal mine. Depending on different measurement manners, the number of magnetic-field lines cut by a low-resistance body greatly varies, and thus the strength of the resulting secondary fields also greatly varies. The present disclosure uses three sets of receiving coils that are arranged perpendicular to each other. One of the three sets of receiving coils and a transmitting coil are arranged according to a coincident loop device, such that response data in all directions can be received from a single transmission. At an underground roadway head, fan shape scan is achieved by changing angles of the transmitting coil and the receiving coils, to obtain more electromagnetic responses, such that a water-rich region in the formation can be more accurately determined.

Abstract: The present disclosure discloses a mine transient electromagnetic (TEM) three-component detection method. TEM transmitting coils and receiving coils are adjusted according to geological features in a coal mine. Depending on different measurement manners, the number of magnetic-field lines cut by a low-resistance body greatly varies, and thus the strength of the resulting secondary fields also greatly varies. The present disclosure uses three sets of receiving coils that are arranged perpendicular to each other. One of the three sets of receiving coils and a transmitting coil are arranged according to a coincident loop device, such that response data in all directions can be received from a single transmission. At an underground roadway head, fan shape scan is achieved by changing angles of the transmitting coil and the receiving coils, to obtain more electromagnetic responses, such that a water-rich region in the formation can be more accurately determined.