Line array multi-channel synchronous transient electromagnetic directional detection method and device thereof

[0024] The present invention will be further described below with reference to the drawings and specific embodiments.

[0025] See image 3 , The synchronization signal of the multi-channel synchronous acquisition system 8 is connected to the transient electromagnetic transmitter 16 through the wire 15 in a synchronous manner. The multi-channel synchronous acquisition system consists of the first synchronous receiving and collecting device 14, the second synchronous receiving and collecting device 13, and the third synchronous The receiving and collecting device 12, the fourth synchronous receiving and collecting device 11, the fifth synchronous receiving and collecting device 10, and the sixth synchronous receiving and collecting device 9 are composed of 6 synchronous receiving and collecting devices in parallel. The first synchronous receiving and collecting device 14 is provided with a first receiving device. Wire frame 2, the second synchronous receiving and collecting device 13 is provided with a second receiving wire frame 3, the third synchronous receiving and collecting device 12 is provided with a third receiving wire frame 4, and the fourth synchronous receiving and collecting device 11 is provided with a fourth receiving wire frame 5. The fifth synchronous receiving and collecting device 10 is provided with a fifth receiving wire frame 6. The sixth synchronous receiving and collecting device 9 is provided with a sixth receiving wire frame 7; the transmitting wire frame 1 of the transient electromagnetic transmitter 16 is arranged perpendicular to the detection In direction 22, the receiving wireframes of the 6 synchronous receiving and collecting devices are set on the central axis perpendicular to the surface of the transmitting wireframe and arranged forward along the detection direction from the center of the transmitting wireframe. The coupling direction and axis of the receiving wireframe To the same direction.

[0026] The receiving wire frame may also use a magnetic rod 19 that measures changes in the magnetic field. It can be three-component or single-component measurement, and the separation distance between the receiving wire frame and the receiving wire frame, and between the magnetic rod 19 and the magnetic rod 19 is not necessarily equal. Multi-component detection can be implemented, through the orthogonal combination of coils, it is possible to measure the components of the axial magnetic field in addition to the transmitting wire frame Magnetic field variation components with

[0027] See image 3 with Figure 4 When in use, it is nearly 30 meters away from the face of the tunnel. The transmitting coil 1 is arranged in the tunnel 17 perpendicular to the axial direction of the tunnel. Starting from the coil center of the transmitting coil 1, 6 receiving coils are arranged on the central axis at a distance of 5 meters. The transmitting coil 1 and the receiving coil are respectively connected to the transient electromagnetic transmitter 16 and the transient electromagnetic transmitter 16; the transient electromagnetic transmitter 16 and the multi-channel synchronous acquisition system 8 are connected through a wire 15; the transient electromagnetic transmitter is activated 16 and the multi-channel synchronous acquisition system 8, through the multi-channel synchronous acquisition system 8, the secondary field signals from near and far relative to the transmitting wire frame 1 are collected. In the multi-channel acquisition signal, the response signal of the interference body around the transmission wire frame 1 and behind the wire frame and the mutual inductance signal of the transmitting coil 1 and the multi-channel receiving coil show the law of forward attenuation, and the abnormal response signal of the first front target 18 appears The forward enhancement law, according to the amplitude and change characteristics of the regular forward enhancement signal, the directional interpretation of the presence of low-resistance anomalies ahead can be made.

[0028] See image 3 with Figure 5 When in use, the transmitter coil 1 is arranged perpendicular to the drill hole with the drill hole 20 as the center. From the center of the coil, 6 magnetic rods 19 are arranged in the drill hole 20 at equal intervals at 1/5 the effective depth of the drill hole. The transmitter coil 1 and the magnetic The rod 19 signal lines are respectively connected to the transient electromagnetic transmitter 16 and the multi-channel synchronous acquisition system 8; the transient electromagnetic transmitter 16 and the multi-channel synchronous acquisition system 8 are connected through a wire 15; the transient electromagnetic transmitter 16 and The multi-channel synchronous acquisition system 8 collects the secondary field signals from near and far relative to the transmitting wire frame 1 through the multi-channel synchronous acquisition system 8. In the multi-channel acquisition signal, the response signal around the transmitting wire frame 1 and the mutual inductance signal of the transmitting coil and the multi-channel receiving coil show a downward decay law, and the abnormal response signal of the second front target 21 shows a downward enhancement law. The amplitude and change characteristics of the regular forward enhancement signal can be used to explain the existence of low-resistance anomalies under the borehole.