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US09477004B2 Dual coil for electromagnetic sounding of layered earth 有权
双层线圈用于层状地球的电磁探测

Dual coil for electromagnetic sounding of layered earth
摘要:
Methods and systems for measuring subsurface electrical conductivity, using first and second sensor coils. The second sensor coil has a smaller effective area and a greater bandwidth than the first sensor coil. The first and second sensor coils are positioned with respect to each other to achieve zero or near zero mutual inductance.
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