Multiwaveform Current Transmitter for Induced Polarization Effects Surveying Based on the SQUID-TEM System

The induced polarization (IP) effects magnetic field measurement method based on the superconductive quantum interfere device (SQUID) and transient electromagnetic (TEM) system can improve the exploration accuracy of metal minerals. As the core component of the SQUID-TEM system based on magnetic sou...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2023, Vol.72, p.1-13
Main Authors: Wang, Shipeng, Zhao, Xuejiao, Qiu, Shilin, Wang, Yuan, Gao, Quanming, Ji, Yanju
Format: Article
Language:English
Subjects:
Controllability
Electromagnetic induction
Induced polarization
Magnetic measurement
Measurement methods
Mineral exploration
Pulse duration
Superconducting quantum interference devices
Superconductors
Technical services
Topology
Transmission
Transmitters
Waveforms
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Summary:The induced polarization (IP) effects magnetic field measurement method based on the superconductive quantum interfere device (SQUID) and transient electromagnetic (TEM) system can improve the exploration accuracy of metal minerals. As the core component of the SQUID-TEM system based on magnetic source, the current transmitter should reach consensus in three key aspects: high power, controllable turn-off time, and combined current waveforms. To solve the problem of single transmitting current waveform and uncontrollable turn-off time in traditional current transmitter, a topology structure of current transmitter with multiple waveform combinations in time domain is proposed in this article. Using the passive multigroup clamp technology and RLC series resonance technology, the falling edge turn-off time of trapezoidal and triangular transmitting current can be controlled, and the pulsewidth of semi-sinusoidal transmitting current can be adjusted. The laboratory and field experiments are implemented to test the performance of the current transmitter. Compared with the commercial PROTEM67 transmitter, the test results show that it can successfully transmit three current waveforms and their combination waveforms, the current amplitude is more than 100A, and the transmitting current turn-off time is controllable. The field measurement response results show that the combined multiwaveform transmit system can effectively measure the induction field and the polarization field generated by the Cole-Cole polarization ring, which provides technical support for the high-precision detection of induction-polarization effects based on the SQUID-TEM system.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2023.3272058