On the Design of a Clad-Etched Fiber Bragg Grating Sensor for Magnetic Field Sensing Applications
The design of a magnetic field sensor system based on clad-etched fiber Bragg grating (FBG) sensors is presented in this chapter. When magnetic field monitoring is performed in electronically harsh environments, conventional measurement systems may not be
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1 FBG-Based Magnetic Field Sensor The design concept of such magnetic field sensor lies in the integration of a clad-etched fiber Bragg grating (FBG), which is sensitive to surrounding refractive index (SRI), with a magnetic-fluid coating as sensing element.
1.1 Magnetic Fluid Magnetic fluid is a stable colloidal solution of ferromagnetic nanoparticles. The behavior of magnetic fluid depends on the external magnetic field and its refractive index shown to be magnetic field dependent [1–3]. The refractive index of a generic material nmat is given by
nmat = e r = 1 + c m
(1)
where εr is the dielectric constant and χm is the electric susceptibility of the material. The selected magnetic fluid consists of an aqueous solution of iron (II, III) oxide (Fe3O4—magnetite) magnetic nanoparticles (
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