Realization of Multi-Frequency Resonance for a Portable Near-Surface Frequency-Domain Electromagnetic Transmitting System

Liu, Changsheng; Liu, Shuxu; Tian, Tongchuan; Liu, Naijia; Zhou, Haigen

doi:10.1109/tim.2022.3219472

Cited by 8 publications

(4 citation statements)

References 19 publications

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“…In field work, the reliability of the method is very important. It has been proved in [23] that the method loses its effectiveness when the capacitance error is 5%. In order to investigate the robustness of the broadband resonant method, we introduce capacitance error to observe the variation of current harmonic magnitude.…”

Section: Robustness Of the Broadband Resonant Methodsmentioning

confidence: 99%

“…To realize multi-frequency transmission, Changsheng Liu et al proposed the method of combining the third-order 2 n pseudo-random waveform with three-frequency resonance [22]. On this basis, Shuxu Liu proposed a resonance design method with more frequencies [23]. This method achieves high-frequency, multi-frequency, and large current transmission, but it increases the number of devices in the transmitter system.…”

Section: Introductionmentioning

confidence: 99%

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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: Robustness Of the Broadband Resonant Methodsmentioning

confidence: 99%

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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show abstract

“…However, this circuit is also unable to filter for multiple bands. Liu et al proposed a multi-frequency resonant circuit for FDEM systems [21,22]. The circuit achieves simultaneous amplification of the multiple target frequency components of the signal and suppression of the non-target frequency components.…”

Section: Introductionmentioning

confidence: 99%

Research on Frequency‐Domain Electromagnetic Detection Signal Acquisition Technology Based on Multi‐frequencyLCFiltering

Liu,

Yu,

Tian

et al. 2023

IEEJ Transactions Elec Engng

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Frequency‐domain electromagnetic (FDEM) instruments are effective tools for detecting underground electrical abnormal targets. However, due to the influence of various noises in the detection process, would lead to l poor signal‐to‐noise ratio of the system and would ultimately affect the detection accuracy. And FDEM detection systems have a defined measuring range. Excessive noise will lead to saturation of the system acquisition and distortion of the measurement. Because of the above problems, an acquisition technique for the FDEM receiving system is proposed to achieve noise suppression in the detection process. The scheme proposes a multi‐frequency LC filtering circuit to optimize the analog signal acquisition module of the receiver system. The circuit converts the measured voltage signal into a current signal, improving the system's immunity to interference. At the same time, the noise of non‐target frequencies in the measured signal is suppressed, avoiding saturation of the receiving system acquisition, and realizing high signal‐to‐noise acquisition of multiple target frequencies. First, the principle of circuit design is analyzed, and the design flow of circuit parameters is proposed. Further, the validity of the design is verified via simulation results. Finally, the optimization scheme is validated with an actual circuit. The results show that for the measurement environment set in this paper, this optimization scheme can suppress the noise of non‐target frequency in the measured signal, so that the noise amplitude can be reduced by more than 90%, and the signal‐to‐noise ratio of the filtered signal can be improved by 23.35 dB. This study helps to facilitate FDEM instruments to achieve high signal‐to‐noise ratio detection. © 2023 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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“…For the purpose of impedance matching, the electromechanical switches are used in [19] for the dual-frequency transmission method. However, the limited switching frequency is unfavorable for high-frequency emissions.…”

Section: Introductionmentioning

confidence: 99%

Dual-frequency transmitter configuration for shallow surface electromagnetic detection

Liu,

Yu,

Zhang

2023

Meas. Sci. Technol.

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In shallow surface electromagnetic detection, the square wave scheme is generally used in conventional transmission systems. Based on frequency-domain electromagnetic sounding theory, high-frequency measurement helps to improve vertical resolution. However, long grounded cable inductance produces severe reactive power suppression at high frequency transmission frequencies, which will reduce detection. To further improve detection accuracy and efficiency, a dual-frequency transmitter configuration is proposed in this article for shallow surface detection. The transmitter simultaneously powers two LC series resonant circuits for the detection of shallow and deep area. Dual-frequency control strategy is adopted, with both bridge arms being provided with constant switching frequency operation. According to the equivalent model of the transmission system, the control of the load branches is independent of each other. The LC series resonant circuit guarantees a wide passband to match long cable inductance that cannot be accurately estimated in advance. Simulations and experimental tests were carried out using this transmitter configuration and control technique. The simulation and experimental results are in general agreement, verifying the feasibility and effectiveness of the proposed dual-band transmitter configuration.

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Realization of Multi-Frequency Resonance for a Portable Near-Surface Frequency-Domain Electromagnetic Transmitting System

Cited by 8 publications

References 19 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

Research on Frequency‐Domain Electromagnetic Detection Signal Acquisition Technology Based on Multi‐frequencyLCFiltering

Dual-frequency transmitter configuration for shallow surface electromagnetic detection

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