Weak Coupling Technology With Noncoplanar Bucking Coil in a Small-Loop Transient Electromagnetic System

Chen, Jian; Pi, Shuai; Zhang, Yang; Lin, Tingting

doi:10.1109/tie.2021.3066940

Cited by 21 publications

(3 citation statements)

References 21 publications

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“…Transient electromagnetic measurements are carried out by using the secondary eddycurrent field excited by a step-pulse current in a large fixed source loop [30,31]. A rectangular emitter loop is placed on the surface of a homogeneous isotropic ground with magnetic conductivity and conductivity.…”

Section: Tem-based Apparent Resistivity Prediction For Water Accumula...mentioning

confidence: 99%

Integrated Geophysical Prediction of Goaf and Water Accumulation in Pingshuo Dong Open-Cut Mine with Ultrashallow and High Drops

et al. 2023

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To address safety problems caused by goaf and water accumulation in open-pit mines, the shallow three-dimensional seismic method and transient electromagnetic method were integrated and applied to detect the mining goaf distribution scope and the water accumulation conditions. In view of the special topographic conditions of an ultrashallow layer and high drop in an open-pit mine, we proposed utilizing bin homogenization and multidomain joint denoising to improve the reliability of seismic data. By using seismic-sensitive attributes to predict the goaf, the transient electromagnetic method was employed to further predict the water accumulation in the goaf. The results show that the shallow seismic method could clearly reflect the reflected-wave variation features of the goaf. The features of a junction between a normal seam and goaf vary obviously, and the prediction effect of the goaf boundary with high resolution is in line with the actual situation. Furthermore, taking the goaf scope prediction with the shallow three-dimensional seismic method as a base, targeted transient electromagnetic detection was deployed, with a detailed analysis of the survey-line repeated areas of the shallow seismic and transient electromagnetic methods. Making full use of the advantages of the shallow seismic and transient electromagnetic methods, we propose a reasonable data interpretation method in combination with the special topographic conditions of open-pit mines, which greatly improves the prediction effect of goaf and water accumulation conditions.

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Section: Tem-based Apparent Resistivity Prediction For Water Accumula...mentioning

confidence: 99%

Integrated Geophysical Prediction of Goaf and Water Accumulation in Pingshuo Dong Open-Cut Mine with Ultrashallow and High Drops

et al. 2023

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“…In the past few decades, the electromagnetic induction (EMI) method has gained wide attention for its non-destructive and convenient advantages due to the urgent need for underground detection [1,2]. Scholars have developed various detection systems, including aerial [3][4][5], semi-airborne [6][7][8], and cart-mounted [9,10], and have also designed different detection devices to suit various scenarios, such as urban construction [11], archaeology [12,13], and pollution detection [14,15]. However, for detecting small areas like undulating terrains, areas with vegetation cover, and hazardous regions with unexploded ordnances, currently available detection devices still need to be improved regarding their cost, detection efficiency, and construction safety [16,17].…”

Section: Introductionmentioning

confidence: 99%

UAV Time-Domain Electromagnetic System and a Workflow for Subsurface Targets Detection

Xing,

Li,

et al. 2024

Remote Sensing

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The time-domain electromagnetic (TDEM) method is acknowledged for its simplicity in setup and non-intrusive detection capabilities, particularly within shallow subsurface detection methodologies. However, extant TDEM systems encounter constraints when detecting intricate topographies and hazardous zones. The rapid evolution in unmanned aerial vehicle (UAV) technology has engendered the inception of UAV-based time-domain electromagnetic systems, thereby augmenting detection efficiency while mitigating potential risks associated with human casualties. This study introduces the UAV-TDEM system designed explicitly for discerning shallow subsurface targets. The system comprises a UAV platform, a host system, and sensors that capture the electromagnetic response of the area while concurrently recording real-time positional data. This study also proposes a processing technique rooted in robust local mean decomposition (RLMD) and approximate entropy (ApEn) methodology to address noise within the original data. Initially, the RLMD decomposes the original data to extract residuals alongside multiple product functions (PFs). Subsequently, the residual is combined with various PFs to yield several cumulative sums, wherein the approximate entropy of these cumulative sums is computed, and the resulting output signals are filtered using a predetermined threshold. Ultimately, the YOLOv8 (You Only Look Once version 8) network is employed to extract anomalous regions. The proposed denoising method can process data within one second, and the trained YOLOv8 network achieves an accuracy rate of 99.0% in the test set. Empirical validation through multiple flight tests substantiates the efficiency of UAV-TDEM in detecting targets situated up to 1 m below the surface. Both simulated and measured data corroborate the proposed workflow’s effectiveness in mitigating noise and identifying targets.

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“…Transient electromagnetic (TEM) method is a widely used non-invasive detection method with high mobility, which can be used for urban underground detection [1]. Due to the limitation of urban road width, TEM exploration of urban underground space has to use small-loop for rapid detection, and the edge length of transmitting coil in small loop TEM detection is less than 2 m [2].…”

Section: Introductionmentioning

confidence: 99%

Design of High Transmission Frequency Circuit for Multiturn Small Loop Transient Electromagnetic Detection

Yan,

Sun,

Zhang

et al. 2023

J. Phys.: Conf. Ser.

Self Cite

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Limited by urban road width and other factors, urban TEM detection can only use multiturn small loop as the transmitting coil. The traditional TEM transmitting circuit cannot transmit high frequency repetitive pulse for such large inductance coil. In order to solve this problem, a high transmission frequency circuit is proposed and built in this paper, which can clamp both the rising and falling edges of the emission current, and effectively improve the frequency. The repeated transmission frequency of 250 Hz for 0.73 mH coil at current of 30 A is realized. The circuit effectively improves the strong magnetic field excitation ability, which is of positive significance for the application of multiturn small loop TEM in urban environment.

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Weak Coupling Technology With Noncoplanar Bucking Coil in a Small-Loop Transient Electromagnetic System

Cited by 21 publications

References 21 publications

Integrated Geophysical Prediction of Goaf and Water Accumulation in Pingshuo Dong Open-Cut Mine with Ultrashallow and High Drops

Integrated Geophysical Prediction of Goaf and Water Accumulation in Pingshuo Dong Open-Cut Mine with Ultrashallow and High Drops

UAV Time-Domain Electromagnetic System and a Workflow for Subsurface Targets Detection

Design of High Transmission Frequency Circuit for Multiturn Small Loop Transient Electromagnetic Detection

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