The Helicopter Time-Domain Electromagnetic Technology Advances in China

Lin, Jun; Chen, Jian; Liu, Fei; Zhang, Yang

doi:10.1007/s10712-021-09635-7

Cited by 8 publications

(4 citation statements)

References 96 publications

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“…This method adopts the working modes of ground transmission and air reception. It takes into account the characteristics of the large detection depth of ground detection methods and the high detection efficiency of airborne electromagnetic methods [3]− [7]. GAFDEM uses grounded conductor sources to emit current waveforms of different frequencies into the ground to detect different depths.…”

Section: Introductionmentioning

confidence: 99%

Design of Broadband Resonant Transmission for Depth-Focused Waveform in GAFDEM Exploration

YU,

MENG,

SHEN

et al. 2024

IEICE Trans. Electron.

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The Ground-Air Frequency Domain Electromagnetic Method (GAFDEM) is a fast and effective semi-airborne electromagnetic exploration method for subsurface anomaly targets. Based on the depthfocused transmission waveform, this method can realize the highresolution detection of underground targets at specific depths. However, due to the high inductance and resistance parameters of the transmitting load in GAFDEM exploration, the transmission current of the depthfocused waveform decays rapidly in the middle and high-frequency bands, which restricts the detection signal intensity. To solve this problem, a broadband resonant circuit and its parameter design method are proposed. According to the typical transmission frequency range and load, the parameters are designed, and the circuit model is simulated and tested. The results show that the designed broadband resonant circuit can increase the transmission active power of the depth-focused waveform by more than 490%, reduce the reactive power by more than 37%, and increase the transmission current intensity of the target frequency by 2.64 times. Moreover, this circuit has good robustness. It can achieve a good resonance effect within the error range of ±10% of capacitor. This design provides an effective way for GAFDEM to enhance the intensity of high-frequency detection signals and improve the shallow exploration effect.

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Section: Introductionmentioning

confidence: 99%

Design of Broadband Resonant Transmission for Depth-Focused Waveform in GAFDEM Exploration

YU,

MENG,

SHEN

et al. 2024

IEICE Trans. Electron.

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“…Airborne Electromagnetic Method (AEM) is a geophysical exploration technology method based on the principle of electromagnetic induction. The method is based on the premise of the difference in electrical and magnetic properties of different underground ore bodies and identifies rare underground materials based on the received data signals, which can quickly achieve the detection of mineral resources over a large area [1].…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis Based on COMSOL Helicopter Time-domain Aeromagnetic Method

Su,

Zhang,

Zhang

et al. 2023

J. Phys.: Conf. Ser.

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This paper takes the time-domain aeromagnetic system as the research object and uses the finite element software COMSOL Multiphysics 6.0 to establish the three-dimensional system model. By comparing the COMSOL Multiphysics forward simulation solution with the one-dimensional numerical solution, it verifies that the COMSOL software meets the simulation accuracy requirements of the three-dimensional time-domain aeromagnetic method, and focuses on the analysis of the transient response at different flight altitudes is also analyzed. Based on the analysis of this paper, a set of aeromagnetic parameters with high detection capability is determined for engineering practice, and a test of the system is completed.

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“…This non-intrusive geophysical method, known as transient electromagnetic (TEM) detection, is extensively employed for subsurface imaging and exploration [5][6][7], particularly for low-resistivity target areas [8]. It finds broad applications in environmental monitoring [9,10], source exploration [11,12], and geological studies [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…The process of inferring the electrical media structure from acquired time-domain electromagnetic induction signals is termed TEM inversion [15,16]. Strata media inversion based on single stations is commonly utilized for extensive geological surveys, often involving substantial data processing [13,17,18]. Traditional optimization methods like Newton's gradient descent are computationally inefficient for massive TEM survey data [15,[19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

TEM Strata Inversion Imaging with IP Effect Based on Enhanced GCN by Extracting Long-Dependency Features

Li,

Di,

Tian

et al. 2023

Electronics

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Utilizing neural network models to inverse time-domain electromagnetic signals enables rapid acquisition of electrical structures, a non-intrusive method widely applied in geological and environmental surveys. However, traditional multi-layer perceptron (MLP) feature extraction is limited, struggling with cases involving complex electrical media with induced polarization effects, thereby limiting the inversion model’s predictive capacity. A graph-topology-based neural network model for strata electrical structure imaging with long-dependency feature extraction was proposed. We employ graph convolutional networks (GCN) for capturing non-Euclidean features like resistivity-thickness coupling and Long Short-Term Memory (LSTM) to capture long-dependency features. The LSTM compensates for GCN’s constraints in capturing distant node relationships. Using case studies with 5-strata and 9-strata resistivity models containing induced polarization effects, compared to traditional MLP networks, the proposed model utilizing time-domain features and graph-topology-based electrical structure extraction significantly improves performance. The mean absolute error in inversion misfit is reduced from 10–20% to around 2–3%.

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The Helicopter Time-Domain Electromagnetic Technology Advances in China

Cited by 8 publications

References 96 publications

Design of Broadband Resonant Transmission for Depth-Focused Waveform in GAFDEM Exploration

Design of Broadband Resonant Transmission for Depth-Focused Waveform in GAFDEM Exploration

Simulation Analysis Based on COMSOL Helicopter Time-domain Aeromagnetic Method

TEM Strata Inversion Imaging with IP Effect Based on Enhanced GCN by Extracting Long-Dependency Features

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