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A transient electromagnetic measuring device and method

A measuring device and transient electromagnetic technology, applied in the field of geophysical exploration, can solve problems such as complicated processing and difficult operation

Active Publication Date: 2016-10-05
HUNAN WUWEI GEOLOGICAL SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The optimal matching on the hardware can reduce the induction field of the receiving antenna itself to a certain extent, but the processing process is complicated; the data processing method is feasible in theory, but difficult to operate in practice

Method used

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  • A transient electromagnetic measuring device and method
  • A transient electromagnetic measuring device and method
  • A transient electromagnetic measuring device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: as figure 1 As shown, it is a schematic diagram of a small-frame transmitting device, including a transmitting antenna coil 1, a receiving antenna coil 2, and a zeroing antenna coil 3. The planes of the three are parallel to each other, and the centers of the three are located on the same central axis perpendicular to the plane. . Vertically, the transmitting antenna coil 1 is closest to the detection area, and the zeroing antenna coil 3 is above the transmitting antenna coil 1 . The vertical distance of the three antennas is adjustable, but it is ensured that the receiving antenna coil 2 is located in the middle of the transmitting antenna coil 1 and the zeroing antenna coil 3 . The transmitting antenna coil 1 and the zeroing antenna coil 3 have the same size, wire type, winding method, and number of turns, and are connected in series in the transmitting loop so that the currents flowing through the two coils are opposite to each other.

[0025] When th...

Embodiment 2

[0026] Embodiment 2: as image 3 As shown, it is a schematic diagram of a large-frame transmitting device, including a large-frame transmitting antenna coil 1, a receiving antenna coil 2, and a zero-adjusting antenna coil 3. The size of the receiving antenna coil 2 is smaller than that of the zero-adjusting antenna coil 3, and the size of the zero-adjusting antenna coil 3 is smaller than that of the transmitting antenna. The planes of the coil 1 and the three are parallel to each other, and their relative positions in the parallel direction can be adjusted. Vertically, the vertical distance of the three antennas is adjustable (can be on the same plane). The transmitting antenna coil 1 and the zeroing antenna coil 3 are connected in series in the transmitting loop, so that the currents flowing through the two coils are opposite to each other. The effective number of turns of the zeroing antenna coil 3 is adjustable.

[0027] When the transmitter feeds current into the transmi...

Embodiment 3

[0028] Embodiment 3: as Figure 4 As shown, it is a schematic diagram of a dipole device, including a transmitting antenna coil 1, a receiving antenna coil 2, and a zeroing antenna coil 3. The size of the receiving antenna coil 2 is smaller than that of the zeroing antenna coil 3 and the transmitting antenna coil 1, and the planes where the three are located are parallel to each other. The relative position in the parallel direction is adjustable. Vertically, the transmitting antenna coil 1 is closest to the detection area, the receiving antenna coil 2 is above the transmitting antenna coil 1, and the zeroing antenna coil 3 is above the receiving antenna coil 2. The horizontal and vertical distances of the three antennas can be adjusted. The zeroing antenna coil 3 and the transmitting antenna coil 1 are connected in series in the transmitting circuit, so that the currents passing through the two coils flow in the same direction 4 . The effective number of turns of the zeroing...

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Abstract

The invention relates to a transient electromagnetic measurement device which comprises a transmitting antenna coil, a receiving antenna coil and a zero setting antenna coil which are parallel to each other. The transmitting antenna coil and the zero setting antenna coil are connected in series. Magnetic flux penetrating through the receiving antenna coil of a primary field generated by the transmitting antenna coil and the zero setting antenna coil is equal to zero or close to zero all the time, the primary field strength of a detection region below a receiving point is ensured, accordingly, the transient process of induction generated by a receiving antenna when emission current is off is eliminated or weakened, the signal to noise ratio of a secondary field signal of an underground medium sensed by the receiving antenna is increased greatly, and high-precision transient electromagnetic detection is achieved.

Description

technical field [0001] The invention belongs to the field of geophysical exploration, and in particular relates to a transient electromagnetic measuring device and method. Background technique [0002] Transient electromagnetic method is a very important method in the field of geophysical exploration. According to the different system carriers used, it can be divided into aerial transient electromagnetic system, semi-aerial transient electromagnetic system, ground transient electromagnetic system, and well transient electromagnetic system. system, tunnel transient electromagnetic system and water transient electromagnetic system. In this method, a current is passed through the transmitting wire, a primary field is transmitted to the target area, and then the transmitting current is cut off instantaneously, and the secondary eddy current field induced by the medium in the target area is observed with an antenna or a grounding electrode during the switching off interval, and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/10
Inventor 席振铢宋刚周胜黄龙龙霞陈兴朋薛军平张道军侯海涛亓庆新王亮肖炜邓华韦洪兰王鹤
Owner HUNAN WUWEI GEOLOGICAL SCI & TECH CO LTD
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