A PEC Thrice Subtraction Method for Obtaining Permeability Invariance Feature in Conductivity Measurement of Ferromagnetic Samples

Dongdong Wen 1,* , Mengbao Fan 1,*, Binghua Cao 2, Zhian Xue 1 and Ping Wang 3,4 1 School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China 2 School of Information and Control Engineering, China University of Mining and Technology, Xuzhou 221116, China 3 School of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 4 Nondestructive Detection and Monitoring Technology for High Speed Transportation Facilities, Key Laboratory of Ministry of Industry and Information, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China * Correspondence: wdd@cumt.edu.cn (D.W.); wuzhi3495@cumt.edu.cn (M.F.); Tel.: +86-0516-83885829 (M.F.)

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