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(a) Magnetic field sensing system based on a capillary tube filled with MF [71], (b) schematic of sensing system based on MF and a singlemode-multimode-singlemode (SMS) fiber structure [72], (c) sensor head and sensing system based on an optical fiber Sagnac interference effect [73], (d) sensing system configuration of photonic crystal fibers (PCF) infiltrated with MF [75]; permission conveyed through the Copyright Clearance Center, Inc.
