Dual-frequency transmitter configuration for shallow surface electromagnetic detection

IF 2.7 3区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Measurement Science and Technology Pub Date : 2023-12-19 DOI:10.1088/1361-6501/ad1742

Weiyu Liu, Shengbao Yu, Xinhao Zhang

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Abstract

In shallow surface electromagnetic detection, the square wave scheme is generally used in conventional transmission systems. Based on frequency-domain electromagnetic (FDEM) 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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用于浅表电磁探测的双频发射器配置

在浅表电磁探测中，传统传输系统一般采用方波方案。基于频域电磁（FDEM）探测理论，高频测量有助于提高垂直分辨率。然而，长接地电缆电感在高频传输频率下会产生严重的无功功率抑制，从而降低探测效果。为了进一步提高探测精度和效率，本文提出了一种用于浅表探测的双频发射器配置。发射器同时为两个 LC 串联谐振电路供电，用于探测浅层和深层区域。采用双频控制策略，两个桥臂均为恒定开关频率工作。根据传输系统的等效模型，负载分支的控制是相互独立的。LC 串联谐振电路保证了较宽的通带，以匹配事先无法准确估计的长电缆电感。利用这种发射机配置和控制技术进行了模拟和实验测试。仿真和实验结果基本一致，验证了所提出的双频发射机配置的可行性和有效性。

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来源期刊

Measurement Science and Technology 工程技术-工程：综合

CiteScore

4.30

自引率

16.70%

发文量

656

审稿时长

4.9 months

期刊介绍： Measurement Science and Technology publishes articles on new measurement techniques and associated instrumentation. Papers that describe experiments must represent an advance in measurement science or measurement technique rather than the application of established experimental technique. Bearing in mind the multidisciplinary nature of the journal, authors must provide an introduction to their work that makes clear the novelty, significance, broader relevance of their work in a measurement context and relevance to the readership of Measurement Science and Technology. All submitted articles should contain consideration of the uncertainty, precision and/or accuracy of the measurements presented. Subject coverage includes the theory, practice and application of measurement in physics, chemistry, engineering and the environmental and life sciences from inception to commercial exploitation. Publications in the journal should emphasize the novelty of reported methods, characterize them and demonstrate their performance using examples or applications.