Articles | Volume 7, issue 1
https://doi.org/10.5194/gi-7-11-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gi-7-11-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Multifunction waveform generator for EM receiver testing
Kai Chen
CORRESPONDING AUTHOR
School of Geophysics and Information Technology, China University of Geosciences, Beijing, China
Sheng Jin
School of Geophysics and Information Technology, China University of Geosciences, Beijing, China
Ming Deng
School of Geophysics and Information Technology, China University of Geosciences, Beijing, China
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Geosci. Instrum. Method. Data Syst. Discuss., https://doi.org/10.5194/gi-2024-1, https://doi.org/10.5194/gi-2024-1, 2024
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This research aims to tackle the issue of inconvenient clock synchronization in marine controlled source electromagnetic (MCSEM) operations with coaxial cables. This clock synchronization method in the manuscript that can be applied to scenarios where coaxial cables are used for MCSEM operations. We hope that in the future, MCSEM transmitters can be deployed on non-research vessels to reduce costs and broaden the scope of applications.
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Current borehole receivers only measure a single parameter of the magnetic field component, which does not meet the special requirements of controlled-source electromagnetic (CSEM) methods. This study proposes a borehole electromagnetic receiver that realizes synchronous acquisition of the vertical electric field component and three-axis orthogonal magnetic field components. Results of the experiments show that our system functioned adequately and that high-quality CSEM signals were obtained.
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Based on existing ocean bottom E-field (OBE) receiver specifications, including low noise levels, low power consumption, and low time drift errors, we integrated two induction coils for the magnetic sensor and a three-axis omnidirectional geophone for the seismic sensor to assemble an ultra-short baseline (USBL) transponder as the position sensor, which improved position accuracy and operational efficiency while reducing field data acquisition costs.
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The existing current recorder is inadequate for continuous recording, precision, bandwidth, dynamic range, and input range. A new full waveform current recorder that is ideal for measuring current signal for electrical prospecting applications is presented. The full waveform current recorder is capable of measuring current with bandwidth from DC to 10 kHz, with a power spectrum density noise floor of 10 A/rt(Hz) at 10 Hz.
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High-power transmitters have been playing a significant role in deep electromagnetic exploration. However, a high-power transmitter needs high-voltage support, which is a potential risk for researchers. According to the actual situation of field exploration, we designed a wireless monitoring system. The system offers two advantages, the first of which is high security; the second advantage is simple operation.
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We developed a software system for a high-precision magnetometer platform, specifically designed for human-occupied vehicles (HOVs). The system integrates magnetometers to deliver accurate magnetic field detection, with advanced features such as automatic probe switching and magnetic compensation. The system's performance was validated through rigorous laboratory tests and marine experiments on the Shenhai Yongshi platform.
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Geosci. Instrum. Method. Data Syst. Discuss., https://doi.org/10.5194/gi-2024-1, https://doi.org/10.5194/gi-2024-1, 2024
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This research aims to tackle the issue of inconvenient clock synchronization in marine controlled source electromagnetic (MCSEM) operations with coaxial cables. This clock synchronization method in the manuscript that can be applied to scenarios where coaxial cables are used for MCSEM operations. We hope that in the future, MCSEM transmitters can be deployed on non-research vessels to reduce costs and broaden the scope of applications.
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This paper proposes a new online data transmission technology for marine controlled-source electromagnetic (MCSEM) transmitters. The technology enables high-precision data acquisition, storage, and ethernet file transmission and offers significant convenience. This technology has the potential to revolutionize the application of MCSEM transmitters in marine explorations and to offer significant convenience.
Sixuan Song, Ming Deng, Kai Chen, Muer A, and Sheng Jin
Geosci. Instrum. Method. Data Syst., 10, 55–64, https://doi.org/10.5194/gi-10-55-2021, https://doi.org/10.5194/gi-10-55-2021, 2021
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Current borehole receivers only measure a single parameter of the magnetic field component, which does not meet the special requirements of controlled-source electromagnetic (CSEM) methods. This study proposes a borehole electromagnetic receiver that realizes synchronous acquisition of the vertical electric field component and three-axis orthogonal magnetic field components. Results of the experiments show that our system functioned adequately and that high-quality CSEM signals were obtained.
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Geosci. Instrum. Method. Data Syst., 9, 213–222, https://doi.org/10.5194/gi-9-213-2020, https://doi.org/10.5194/gi-9-213-2020, 2020
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M. A. Pudney, C. M. Carr, S. J. Schwartz, and S. I. Howarth
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E. Kozlovskaya and A. Kozlovsky
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Short summary
To assess the performance of the developed EM receivers, this paper presents a multifunctional waveform generator with three waveforms: 1) a wideband, low-noise electromagnetic field signal to be used for magnetotelluric, audio-magnetotelluric, and long-period magnetotelluric studies; 2) a repeating frequency sweep square waveform for CSAMT and SIP studies; and 3) a “positive-zero–negative-zero” signal that contains primary and secondary fields for time-domain-induced polarization studies.
To assess the performance of the developed EM receivers, this paper presents a multifunctional...