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(a) Sensing head and system based on etched FBG coated by Terfenol-D film [38], (b) sensor probe composed of FBG Fabry–Perot cavity [39], (c) Thermal compensated magnetic-field sensor with coated and uncoated FBGs [40], (d) sensor head structure of FBG with micro-machined groove filed with Terfenol-D [42].
