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The Signal Distortion Due to the Electromagnetic Induction Inside a Cable  

Jeong Ji-Min (한국지질자원연구원 지반안전연구부)
Choi Seong-Jun (한국지질자원연구원 지반안전연구부)
Kim Jung-Ho (한국지질자원연구원 지반안전연구부)
Song Young-Soo (전북대학교 자원에너지공학과)
Publication Information
Geophysics and Geophysical Exploration / v.7, no.4, 2004 , pp. 251-255 More about this Journal
Abstract
Electric cables such as multi-interphone cables and ribbon cab]os are commonly used for data aquisition in the DC resistivity survey. In general, electromagnetic induction may occur in the electric cables when electric current flows through them. In case of using multi-interphone cables in the DC resistivity survey, electromagnetic induction could take place due to the entangled wires of the multi-interphone cables, when the current flows through them. Then, the electromagnetic induction may cause measured DC resistivity data to be distorted. In this study, a monitoring system with PXI (PCI Extention for Instrumentation) was constructed to examine signal distortion on the DC resistivity data, attributed to the electromagnetic induction. Common electric cables used in the DC resistivity survey were tested to observe the waveforms of the electric voltages. The waveforms measured were compared to examine signal distortion due to the electromagnetic induction. The results may provide information on the resistivity data obtained using different electric cables in the DC resistivity survey. The distortion of waveforms attributed to the electromagnetic induction wat not observed when using ribbon cables for DC resistivity data aquisition, while the distortion were observed when using multi-interphone. Therefore, the ribbon cables provide better quality of data than other cables in the DC resistivity data aquisition.
Keywords
DC resistivity survey; electromagnetic induction; distortion;
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