公开(公告)号：US20230305181A1

公开(公告)日：2023-09-28

申请号：US17851348

申请日：2022-06-28

Applicant: University of Electronic Science and Technology of China

Inventor： Guoyun GUAN ,  Min MENG ,  Jun HU ,  Zaiping NIE

IPC: G01V3/28 ,  G01V3/30

CPC classification number: G01V3/28 ,  G01V3/30

Abstract: A method of reducing or rejecting common mode interference and a circuit for electromagnetic induction logging with improved common mode interference reduction or rejection are disclosed, which are useful in the field of electromagnetic induction logging technology. Accurate formation signals are calculated based on phases and amplitudes of common mode signals, which do not change with the coil access mode, and phases of differential signals, which are reversed with amplitudes unaltered when the coil is connected reversely. This provides a mechanism to effectively eliminate the influence of common mode interference even when the common mode interference is greater in amplitude than the signals from a geological formation.