Detection device based on transient electromagnetic method (TEM)

A transient electromagnetic method and detection device technology, applied in the field of electromagnetic detection, can solve the problems of reduced detection accuracy, inability to distinguish useful signals and interference signals, etc., and achieve the effects of improving convergence performance, increasing survey depth, and accurate average thickness of pipelines

Active Publication Date: 2012-07-25
刘冀成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For parallel, intersecting or close pipelines, or other metal objects near the pipeline under test, the secondary electromagnetic fields generated by them interfere with each other, resulting in reduced detection accuracy, and even unable to distinguish between useful signals and interference signals

Method used

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  • Detection device based on transient electromagnetic method (TEM)
  • Detection device based on transient electromagnetic method (TEM)
  • Detection device based on transient electromagnetic method (TEM)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The detection device based on the transient electromagnetic method in this example includes a transmitting antenna for generating a transient electromagnetic field and a receiving antenna for receiving a secondary electromagnetic field excited by the transient electromagnetic field. In this example, the transmitting antenna consists of an array of two coils with a side length of 60cm, such as Figure 4 with Figure 5 shown. The two coils are respectively located in two parallel planes, the distance between the two parallel planes is L, the projection of the first coil 1 on the plane where the second coil 2 is located partially overlaps, and the length of the overlapping part is d. In the transmitting antenna array of this structure, the overlapping area A of the two coils is the area where the synthesized electromagnetic field converges. Figure 14 b gives L=3cm, d=6cm, the drive current is 1A, and the current direction is as Figure 4 The shown coil array is a simul...

Embodiment 2

[0046] Image 6 with Figure 7 The structure of the transmitting antenna array in this example is shown. This is actually the case of d=0 in Embodiment 1. This is the case where two sub-coils are connected, and the transmitting antenna array can control the convergence area of ​​the synthesized electromagnetic field by adjusting the current and the distance L of the two sub-coils.

Embodiment 3

[0048] In this example, the transmitting antenna array is configured with a third coil 3 at the overlapping portion of the two coils, see Figure 8 with Figure 9 . The plane where the sub-coil 3 is located is parallel to the plane where the two coils are located. Figure 14 c shows the electromagnetic field distribution simulation diagram at a distance of 100 cm from the plane where the second coil 2 is located. The simulation conditions are: Coil 1 and Coil 2 are both squares with a side length of 60cm, according to Figure 8 Input drive current 1A in the direction shown; the third coil 3 is a rectangular coil of 60×42cm, press Figure 8 Input drive current 1A in the indicated direction; L=a=3cm, d=6cm. Compare Figure 14 b and Figure 14 c It can be seen that the configuration of the third coil 3 makes the electromagnetic field distribution from ellipse to circular, and by adjusting various parameters in the coil array in this example, such as a, L, d, I1, I2, I3, etc...

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Abstract

The invention relates to a transient electromagnetic method (TEM) technology and discloses a detection device based on the TEM. The device comprises a transmitting antenna for generating a transient electromagnetic field and a receiving antenna for receiving a secondary electromagnetic field excited by the transient electromagnetic field, wherein the transmitting antenna consists of a coil array which is composed of at least two coils; and an electromagnetic field generated by the coil array is converged towards a set area. According to the detection device based on the TEM, a single coil of a primary field transmitting antenna of the TEM is modified into the coil array consisting of a plurality of coils, and related parameters of various coils in the array are adjusted, so that the generated electromagnetic field vectors are superposed and converged to the set area, and the divergence of the electromagnetic field generated by the transmitting antenna is greatly improved; and therefore, the coverage range of the primary field is constrained, and the converging performance of the transmitting antenna is improved. The detection device is mainly used for the field of electromagnetic detection, such as prospection, underground pipeline detection, metal detection and the like.

Description

technical field [0001] The present invention relates to electromagnetic detection technology, in particular to a time domain electromagnetic method (Time domain electromagnetic method) also known as a transient electromagnetic method (Transient Electromagnetic Method, abbreviated as TEM) detection technology. Background technique [0002] Transient electromagnetic method (TEM) is an electromagnetic detection technology, mainly used for metal detection and mineral resource detection. TEM is widely used in the evaluation of metal pipeline status (such as: average thickness, corrosion degree, leakage, etc.) . TEM uses the instantaneous change of the current in the transmitting antenna to generate pulsed electromagnetic waves (called primary electromagnetic field, or primary field). Under the excitation of the primary electromagnetic field, the inside of the object under test will generate an induced current that changes with time due to electromagnetic induction. The secondary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/10H01Q21/00H01Q7/00
Inventor 刘冀成
Owner 刘冀成
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